City of Corona DWP
2015 Consumer Confidence Report


Message from the General Manager

The City of Corona Department of Water and Power (DWP) has been working over the years to reduce our water use by developing a reclaimed water system, an active water conservation program, ensuring sustainability through developing relationships within our region and increasing our local water supplies. We are proud of our efforts and the community’s for working over the years to reduce our water use, but we are now called on by the Governor and fellow Californians who need us to do more. Corona has been required by the SWRCB to reduce our water use by 28%. Since most indoor water use cannot be reduced, we must look outdoors to provide us with the savings needed.

In response to the Governor’s Executive Order, in May the DWP announced that we will go to Stage 3 of our Water Conservation Ordinance. Stage 3 requires 3 days per week watering, with 10 minutes maximum per station. The goal is to reduce outdoor water use by 50%. We know that the coming months will be tough for everyone as the State grapples with its water problems and temperatures increase. But we know that together as a community, we will do what is necessary to meet those requirements. DWP is here to help with programs and incentives to reduce both indoor and outdoor water use.
I am proud to provide this annual report to you. It lists the types and amounts of key elements in your water supply, their likely sources and the maximum contaminant level (MCL) that the United States Environmental Protection Agency considers safe. We utilize a multi-barrier treatment process to assure safe drinking water is delivered to your home or business. Information contained in this report includes both required statistics and other information on water quality

to provide you with the tools you need to make informed choices about the water you drink. This report not only reflects our ability to meet and exceed health standards, it also demonstrates our commitment to you and our community that we will always provide you with the best product and service that we can offer.

I invite you to please contact me with any questions on this report or if you  require additional information.

Jonathan Daly
General Manager
951-736-2477
www.CoronaDWP.org

This report not only reflects our ability to meet health standards, it also demonstrates our commitment to you that we will always provide you with the best that we can offer.


Exceeding Standards

Last year, as in years past, your tap water met all United States Environmental Protection Agency (USEPA) and State drinking water health standards. The City of Corona safeguards its water supplies, and we are proud to report that our system has not violated any primary drinking water standard.
This report is a snapshot of the water quality in 2014. Included are details about where your water comes from, what it contains, and how it compares to the State’s standards.

 


Corona’s Water Sources

In 2014, Corona residents and businesses used approximately 12.5 billion gallons of drinking water. Corona’s water supply comes from three main sources: local groundwater supplies, the Colorado River and the State Water Project in Northern California. Groundwater wells owned and operated by the City of Corona provided 57.4% of our water supply, with another 35.4% coming through Lake Mathews from the Colorado River, 4% is from the State Water Project’s California Aqueduct and the final 3.2% is purchased from Western Municipal Water District’s Arlington Desalter treatment facility.


Water Treatment Processes

The water from the Colorado River requires treatment to remove and inactivate harmful organisms. This process is accomplished using the City of Corona’s two surface water treatment facilities: the Sierra Del Oro and Lester Water Treatment Facilities. These facilities incorporate the use of coagulants, which bind small particles together to form larger particles that can be easily removed through multimedia filtration and disinfection. Through independent laboratory testing, 100% of the samples taken in 2014 were free of harmful organisms.

About half of the groundwater pumped in Corona is sent through a state- of-the-art reverse osmosis membrane treatment facility, the Temescal Desalter. This facility incorporates nitrate and Total Dissolved Solids (TDS) removal, and also provides disinfection.

The Department of Water and Power disinfects the distribution system with monochloramines (a ratio of chlorine and ammonia). This allows us to achieve a long-lasting chlorine residual and reduce the production of disinfection byproducts. Disinfection byproducts are formed when disinfectants (i.e. chlorine and monochloramines) react with naturally occurring organic matter in water.


Blending

The Department of Water and Power has five active blending facilities that blend water with low nitrate, fluoride, perchlorate and Total Dissolved Solids with the remaining groundwater sources to deliver safe, reliable drinking water to your tap.

You will notice in the tables ofdetected contaminantsthatthegroundwater exceeds the primary standard for fluoride, nitrate and perchlorate. The Department of Water and Power is required by law to report the range of all samples monitored, as well as the average concentration delivered to your tap. The averages of what you receive at your tap are much lower because the Department of Water and Power treats and blends water from several sources to meet water quality standards. The blending stations are continuously monitored and routinely sampled to ensure that the water delivered to your tap meets all health standards with a safety margin of no less than 10%. Please refer to the “Treated Average System Water” column in the tables at the end of the report for a more accurate representation of system water quality.

For more information about fluoridation, oral health, and current issues visit: http://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/Fluoridation.shtml.


Governor Brown’s Executive Order B-29-15

After viewing the non-existent snowpack in the Sierra Nevada mountains earlier this year, Governor Brown issued Executive Order B-29-15. This executive order mandated a net 25% statewide reduction in potable, or drinking, water use from 2013 water usage. Governor Brown’s executive order can be found online at http://gov.ca.gov/docs/4.1.15_Executive_Order.pdf.

Governor Brown’s executive order contained many prohibitions on water use. Watering turf medians with potable water is restricted. All new homes must have drip or subterranean irrigation – no overhead spray heads are allowed. Watering within 48 hours of measurable rainfall is prohibited. Agencies or individuals that do not do their part to reduce water use will be fined or otherwise penalized.

The Governor called on the State Water Resources Control Board, or SWRCB, to implement and oversee the water reduction mandates. The SWRCB created eight different tiers of water reduction, ranging from 4% to 36%. They put each water agency in a tier based on their water usage from June through September 2014. Despite Corona’s past conservation efforts and a robust reclaimed water system, Corona’s conservation target tier is a 28% reduction from our water use in 2013. A 28% reduction is a staggering amount for Corona at nearly 2.2 billion gallons of water. Since most indoor water use is essential for health and safety, the Governor’s message is clear:  reduce outdoor watering.


What is Corona Doing About the Governor’s Mandate?

The City of Corona Department of Water and Power (DWP) thanks everyone for their overwhelming participation in conservation over the past several years. While those conservation efforts have not gone unnoticed, the City is still responsible for ensuring that we comply with the SWRCB’s mandated reduction. Therefore, in response to the SWRCB’s determination, the DWP is taking the following actions:


Stage 3 Water Conservation Ordinance

Stage 3 of Corona’s Water Conservation Ordinance requires the following:

 


What Can We Expect?

A 28% reduction in water use is a lot. These mandates will have a definite impact on the City and the way it looks. Watering three days per week at a maximum of 10 minutes per station may cause your lawn stress. Many lawns will turn yellow. There will be increased activities by the DWP to help both individuals and businesses set their watering schedule to comply with Stage 3 requirements. You may receive a notification regarding a leak, water running off your property or watering outside the watering days and times. If you do, it is important to address the issue promptly.


Cash for Grass

While we may not like or agree with the Governor’s mandate, the facts about outdoor water use are staggering. For example, did you know that about 60 – 70% of your annual water use is used outside your home? Corona receives only about 12 inches of rain in an average year. As a comparison, Las Vegas receives about 4 inches of rain per year; we are not that far off. Grass needs around 52 inches of water a year to live in our climate. That means that we are applying 40 inches of water, or more, to help grass survive in our semi-arid landscape. Removing some grass can dramatically reduce your water use and also beautify your landscape.

Think about removing small areas of grass if you don’t want to completely remove your turf – make an existing planter larger, or remove the grass in your parkway. The Water Resources Team makes this easy for you through the Cash for Grass Rebate Program. Front yard, parkway and backyard projects are eligible to receive a rebate of $3 per square foot of grass replaced with a maximum of 3,000 square feet. Artificial turf is also eligible for the rebate. Visit www.CoronaDWP.org/res-rebates for the full Cash for Grass rebate application and guidelines.


We Are In This Together, and We Are Here To Help

This summer is sure to be challenging. Restrictions of any kind cause tension, and the summer heat will only add to the situation. We want to remind the community that DWP is here to help everyone get through these issues. Our goal is to first provide help to residents and businesses to meet these mandates. We’re the experts on water, so let us help you. We offer a variety of programs, including rebates for high-efficiency appliances, free sprinkler nozzles and devices, landscape check-ups and more. Just give our Water Resources Team a call at 951-736-2234 to find out more on how you can help do your part to reach this target.


Water: An Undervalued Resource

Earth is called the blue planet because most of its surface is covered with water. Yet only 3% of the earths’ water is fresh water that is used for drinking, with 2/3 stored in ice caps and glaciers. That’s a small amount of water for everyone on the planet to share. Yet many of us don’t think twice about the water that we use every day. All too often, water that has been pumped in from afar and treated for human consumption can be seen running down the storm drains – wasted.
At a cost of less than a penny a gallon, the real value of water is not represented in the price that we pay for it. Water is a precious resource; we all need it to live. The current drought situation in California has proven that water availability is not guaranteed. A water supply can be highly variable, with many factors that affect it, including drought, legislative restrictions, water quality issues and environmental needs.

We must always use our resources efficiently, and focus on sustainable water supplies. Make every drop count – use water efficiently always.


Tour Our Facilities– In Person or On the Web!

A lot goes on behind the scenes to provide our customers with clean and affordable drinking water. Do you want to learn more about how your water is treated and delivered? Are you interested in seeing how we produce reclaimed water? If you have any questions about our water supply or water reclamation facilities, or you’re just curious, we encourage you to attend one of our quarterly facility tours. Visit our website at www.CoronaDWP.org to be put on an interest list for future tours, or contact our Water Resources Team at 951-736-2234 or by e-mail at StopTheDrop@discovercorona.com to sign up for an upcoming tour. You must be at least 18 years old and a customer of the Department of Water and Power to attend.

Don’t have the spare time to come on a tour? The Department of Water and Power has created 11 new videos of our facilities and services for you to watch from the convenience of your home computer or tablet. Simply go to our website at www.CoronaDWP.org.


Reclaimed Water

To improve water supply reliability for the City, the Department of Water and Power developed and built our reclaimed water system in 2006. Utilizing reclaimed water to help meet water demands for the City reduces the impact of imported water supply shortages and costs.

The reclaimed water system uses highly treated wastewater from our state-of-the-art water reclamation facilities and distributes it throughout the reclaimed water system. The reclaimed system is completely separate from the drinking water system, utilizing a purple pipe system and sprinkler caps and signage to denote its location. Reclaimed water is used primarily on landscaping at parks, schools and parkway areas, and even in a commercial building. By re-using water that would normally have been wasted, we save potable water for our homes and businesses.

The City of Corona’s infrastructure for the reclaimed water system consists of approximately 47 miles of pipeline, three storage tanks, and four pump stations. The reclaimed water system produced 2.25 billion gallons of reclaimed water in 2014. We currently have 286 connections, and are continually adding new sites.


Did You know?

 


From Your Drain to the Environment – Keep it Clean

While water reclamation treatment removes most pollutants, even trace amounts of some substances may be harmful to the environment. The best solution is to prevent pollution from going down the drain in the first place.

Dispose of unwanted medicine properly… No Drugs Down the Drain!

For years, unwanted medicine was flushed down the drain to protect children and pets from accessing it, and to ensure against illegal recovery of controlled substances. Today, there are better options. The City of Corona Department of Water and Power and the Police Department are working together to protect our environment from the harmful effects of improperly discarded, unused medications. For your convenience, a pharmaceutical disposal bin has been placed at the Corona Police Department lobby located at 730 Public Safety Way. For more information, please call 951-736-2330.

Keep drains free of FOG – Fats, Oils and Grease

When washed down the drain, cooking fats, oils and grease, or “FOG,” can block sewer lines, causing raw sewage to back up into your home or into neighborhood streets and storm drains. Overflows can be costly, and pose health and environmental hazards. Keep your sewer lines FOG-free by scraping cooking fats into the garbage or into your food scrap recycling bin, where available – not down the drain.


A Note About Water Quality Monitoring in 2014

We are required to monitor your drinking water for specific contaminants on a regular basis. Results of regular monitoring indicate whether or not our drinking water meets health standards. During August 2014, we did not complete all monitoring or testing for total coliform, and therefore cannot be sure of the quality of your drinking water at that time. Due to a miscommunication/error from the laboratory, the City collected repeat samples at a different location than required. Subsequent samples taken at the correct locations met the health standards. The City has taken the necessary actions with our laboratory to prevent this issue from occurring again.


General Water Quality Information

The sources of drinking water (both tap and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.

Contaminants that may be present in source water include:

In order to ensure that tap water is safe to drink, the U.S. Environmental Protection Agency (USEPA) and the State Water Resources Control Board (State Board) prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. State Board regulations also establish limits for contaminants in bottled water that provide the same protection for public health.

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the USEPA’s Safe Drinking Water Hotline (1-800-426-4791).

Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. USEPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (1-800-426-4791).

Nitrate

Nitrate in drinking water at levels above 45 mg/L is a health risk for infants less than six months of age. Such nitrate levels in drinking water can interfere with the capacity of the infant’s blood to carry oxygen, resulting in a serious illness; symptoms include shortness of breath and blueness of the skin. Nitrate levels above 45 mg/L may also affect the ability of the blood to carry oxygen in other individuals, such as pregnant women and those with certain specific enzyme deficiencies. If you are caring for an infant, or you are pregnant, you should ask advice from your health care provider.

Source Water Assessment

In accordance with the Federal Safe Drinking Water Act (SDWA), the State Water Resources Control Board Division of Drinking Water and Environmental Management developed a program, called the Drinking Water Source Assessment and Protection (DWSAP) Program, to assess the vulnerability of drinking water sources to contamination. Assessments of the drinking water sources for the City of Corona were completed most recently in February 2012. The assessment concluded that the City of Corona’s sources are considered most vulnerable to the producers, septic systems – low density [<1/acre], sewer collection systems, underground storage tanks – confirmed leaking tanks, utility stations – maintenance areas, and wastewater treatment plants. A copy of the complete assessments are available through the City of Corona’s City Clerk’s office at 400 S. Vicentia, Corona, CA 92882, or by using the online Public Records Request form at www.CoronaDWP.org.

Chromium-6

On July 27, 2011, the Office of Environmental Health Hazard Assessment (OEHHA) established a public health goal (PHG) for chromium-6 (hexavalent chromium) of 0.02 parts per billion (ppb). The PHG will contribute to CDPH’s development of a primary drinking water standard (maximum contaminant level, MCL) that is specific for chromium-6. Please refer to
http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Chromium6.aspx for more information.

 

Lead and Copper Rule Monitoring

The Lead and Copper Rule (LCR) was developed to protect public health by minimizing lead and copper levels in drinking water which primarily enters drinking water through plumbing materials. The LCR established an action level of 15 parts per billion (ppb) for lead and 1.3 parts per million (ppm) for copper based on the 90th percentile level of tap water samples collected. Lead and copper are sampled on a mandated three year testing cycle with sampling conducted at the customer’s tap.

100% of the samples taken in 2013 were free from harmful organisms.

Parameter Units State MCL
PHG State DLR Date Sampled 90th Percentile No. Sites Sampled No. Sites Exceeding AL
Lead
ppb AL=15 0.2 5 2014 2 50 0
Copper ppm AL=1.3 0.3 0.05 2014 0.11 50 0

AL         Allowable Levels
DLR      Detection Limits for purposes of Reporting
MCL      Maximum Contaminant Level
PHG      Public Health Goal
ppb       Parts per billion or micrograms per liter (μg/L)
ppm      Parts per million or milligrams per liter (mg/L)

Primary Standards —
Mandatory Health-Related Standards 

Clarity

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
Water Source Major Sources in
Drinking Water
Combined Filter
Effluent Turbidity
NTU
TT 0.3
NA Highest Metropolitan Water District, Henry J. Mills Water Treatment Plant 0.12 Soil runoff
% 95(a) % < 0.3 100%
Combined Filter
Effluent Turbidity
NTU TT 0.3
NA Highest City of Corona, Lester & Sierra Del Oro Water Treatment Facilities 0.15 Soil runoff
% 95(a) % < 0.3 100%

Microbiological Contaminants

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
Regulated in Distribution System Major Sources in
Drinking Water
Total Coliform Bacteria
(Total Coliform Rule)
% 5.0 (b) (0) Highest % of positive samples collected in any one month =  3% Naturally present in the environment
Fecal Coliform
and E. Coli
(Total Coliform Rule)
(c) (c) (0) Total number of positive samples collected in 2013 = 0 Human and animal fecal waste
Heterotrophic Plate Count (HPC) CFU/mL TT N/A N/A Range Distribution System Wide:  ND-5,700 Naturally present in the environment
Average Distribution System Wide: 10

Radioactive Contaminants(j)

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Major Sources in Drinking Water
Gross Alpha Particle Activity  pCi/L 15 (0) 3 Range ND 3-5 ND-19.6 Erosion of natural deposits
Average ND 4 3.37 7.6
Uranium  pCi/L 20 0.43 1 Range ND-1 2-3 ND-18.6 Erosion of natural deposits
Average 1 3 3.04 7.21
Combined
Radium - 226+228
pCi/L 5 (0) NA Range ND ND ND Erosion of natural deposits
Average ND ND ND

Inorganic Contaminants

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Major Sources in Drinking Water
Arsenic ppb 10 0.004 2 Range ND 2.2 ND ND-3.8 ND-2.5 Erosion of natural deposits; runoff from orchards; glass and electronics production wastes 
Average ND 2.2 ND ND ND
Barium ppm 1 2 0.1 Range ND 110 ND ND-0.13 ND-0.1 Discharges of oil drilling wastes and from metal refineries;erosion of natural deposits 
Average ND 110 ND ND ND
Fluoride(e,h) ppm 2 1 0.1 Range 0.2-1.0 0.3 0.1-0.2 ND-4.4 ND-0.5 Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
Average 0.8 0.3 0.1 0.6 0.3
Nickel ppb 100 12 10 Range ND ND ND ND-12 ND Erosion of natural deposits; discharge from metal factories
Average ND ND ND ND ND
Nitrate
(as N03)(d,e,k)
ppm 45 45 2 Range 4.95 ND 18-27 ND-99 ND-30 Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits
Average 4.95 ND 22 37 8
Perchlorate (e,i,k) ppb 6 6 4 Range ND ND ND ND-11 ND Perchlorate is an inorganic chemical used in solid rocket propellant, fireworks, explosives, flares, matches, and a variety of industries.  It usually gets into drinking water as a result of environmental contamination from historic aerospace or other industrial operations that used or use, store, or dispose of perchlorate and its salts
Average ND ND ND ND ND
Selenium ppb 50 30 5 Range ND ND ND ND-9.1 ND Discharge from petroleum, glass, and metal refineries;  erosion of natural deposits;  discharge from mines and chemical manufacturers; runoff from livestock lots (feed additive)
Average ND ND ND ND ND

Synthetic Organic Contaminants (including Pesticides/PCBs)

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Major Sources in Drinking Water
Dibromochloro-propane (DBCP) ppt 200 1.7 10 Range ND ND ND ND-31 ND Banned nematocide that may still be present in soils due to runoff/leaching from former use on soybeans, cotton, vineyards, tomatoes, and tree fruit
Average ND ND ND ND ND

Volatile Organic Contaminants

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Major Sources in Drinking Water
Tetrachloroethylene
(PCE)
ppb 5 0.06 0.5 Range ND ND ND ND-0.97 ND Discharge from factories, dry cleaners, and auto shops (metal degreaser)
Average ND ND ND ND ND
Trichloroethylene
(TCE)
ppb 5 1.7 0.5 Range ND ND ND ND-1.8 ND Discharge from metal degreasing sites and other factories
Average ND ND ND 0.6 ND

Secondary  Standards—Aesthetic Standards

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Major Sources in Drinking Water
Aluminum(u) ppb 200 600 50 Range ND-360 ND ND ND ND-420 Erosion of natural deposits; residue from some surface water treatment processes
Max RAA 130 ND ND ND 286
Chloride  ppm 500 NA NA Range 76-100 81-83 41-44 ND-240 76-83 Runoff/leaching from natural deposits; seawater influence
Average 90 82 42 132 80
Corrosivity (as Aggressiveness Index) AI NA NA NA Range 11.9-12.1 5.4-13 Elemental balance in water; affected by temperature, other factors
Average 12 11.7
Foaming Agents (MBAS) ppb 500 NA NA Range ND ND ND ND-56 ND Municipal and industrial waste discharges
Average ND ND ND 4.7 ND
Iron ppb 300 NA 100 Range ND ND ND ND-110 ND Leaching from natural deposits; industrial wastes
Average ND ND ND ND ND
Manganese(f,k) ppb 50 NL=500 20 Range ND ND ND ND-990 ND Leaching from natural deposits
Average ND ND ND 48 ND
Odor Threshold ppb 3 NA NA Range 3 10 ND ND-3 ND Naturally-occurring organic materials
Average 3 10 ND 0.6 ND
Specific
Conductance(k)
µS/cm 1,600 NA NA Range 570-580 920-960 430-480 4-2,100 890-1,000 Substances that form ions when in water; seawater influence
Average 580 940 451 1,229 945
Sulfate ppm 500 NA 0.5 Range 45-63 220 44-51 ND-360 160-220 Runoff/leaching from natural deposits; industrial wastes
Average 54 220 48 186 190
Total Dissolved Solids(e,k,t) ppm 1,000 NA NA Range 310-320 580-590 190-340 ND-1,400 430-600 Runoff/leaching from natural deposits
Average 310 590 258 805 532
Turbidity Units 5 NA NA Range ND 0.4-1.1 ND ND-0.4 ND Soil runoff
Average ND 1.1 ND 0.1 ND

Unregulated Chemicals Requiring Monitoring (State and Federal)(g)

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water

Colorado
River
Water

Arlington Desalter Ground
Water
Treated
Average
System
Water
Health Effects
Boron(p) ppm NA NL=1 0.1 Range 0.22 0.13 0.33-0.56 The babies of some pregnant women who drink water containing boron in excess of the notification level may have an increased risk of developmental effects, based on studies in laboratory animals 
Average 0.22 0.13 1.4
Chromium VIq) ppb NA 0.02 1 Range ND ND ND-1.1 NA
Average ND ND 0.46
Vanadium ppb NA NL=50 3 Range 4.4 ND 4.6-5.9 ND-10 The babies of some pregnant women who drink water containing vanadium in excess of the notification level may have an increased risk of developmental effects, based on studies in laboratory animals
Average 4.4 ND 5.3 4.4

Federal Unregulated Contaminants Monitoring Rule (UCMR3) (v)

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range
Average
State
Project
Water
List 1 – Assessment Monitoring
1,4-Dioxane ppb NA NA 0.07 Range ND-0.134
Average 0.045
Chlorate ppb NA NA 20 Range 32-220
Average 160
Chromium ppb NA NA 0.2 Range ND-0.28
Average 0.05
Hexavalent Chromium (Dissolved) ppb NA NA 0.03 Range 0.03-0.27
Average 0.133
Molybdenum ppb NA NA 1 Range ND-4.2
Average 3.3
Strontium ppb NA NA 0.3 Range 28-850
Average 595
Vanadium ppb NA NA 0.2 Range ND-4.3
Average 25
Perfluoro octanesulfonic acid – PFOS ppb NA NA 0.04 Range ND-0.043
Average 0.004
Perfluorooctanoic acid – PFOA ppb NA NA 0.02 Range ND-0.029
Average 0.005

 

Other Parameters

 

Chemical
Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
  State
DLR
  Range
Average
State
Project
Water
Colorado
River
Water
Arlington
Desalter
  Ground
Water
Treated
Average
System Water
Alkalinity ppm NA NA NA Range 63-89 130 74-120 ND-340 110-120
Average 78 130 87 207 115
Calcium ppm NA NA NA Range 19 - 28 66-69 31-36 ND-190 59-73
Average 24 68 34 114 66
Hardness (r) ppm NA NA NA Range 100 - 120 270-280 120-140 ND-700 230-290
Average 110 270 133 410 260
Magnesium ppm NA NA NA Range 12 25 11-13 ND-71 19-25
Average 12 25 12 30 22
pH pH Units NA NA NA Range 8.4 8.2 7.5-8.55 5.6-7.8
Average 8.4 8.2 8.1 7.2
Potassium ppm NA NA NA Range 2.8-3.0 4.4-4.5 <1-1.4 ND-12 3-4
Average 2.9 4.4 1 4 3.5
Sodium (s) ppm NA NA NA Range 63-72 84 40-43 ND-190 75-87
Average 68 84 42 98 81
Bicarbonate ppm NA NA NA Range - - 90-140 ND-420 130-140
Average - - 106 252 135

Water-saving Tip: Don’t water when it’s windy and water early, before 10 a.m., to avoid evaporation.

2015 Annual Water Quality Report for 2014

Disinfection Byproducts, Disinfectant Residuals, and Disinfection Byproduct Precursors Federal Rule(m)

Parameter Units State
MCL
[MRDL]
PHG
(MCLG)
[MRDLG]
State
DLR
Range Avg
/Max RAA
Distribution System Wide Major Sources in Drinking Water Health Effects Language
Total Trihalomethanes (TTHMs)(n) ppb 80 NA 1 Range ND-42 Byproduct of drinking water disinfection Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience liver, kidney, or central nervous system problems, and may have an increased risk RAA 31.3 of getting cancer.
RAA 31.3
Haloacetic Acids(o) ppb 60 NA 1 Range ND-17 Byproduct of drinking water disinfection Some people who drink water containing haloacetic acids in excess of the MCL RAA 15.5 over many years may have an increased risk of getting cancer.
RAA 15.5
Bromate (Mills – WR-24 Conn.)(l) ppb 10 0.1 1 Range 1.0-12 Byproduct of drinking water disinfection Some people who drink water containing bromate in excess of the MCL over Max RAA 3.9 many years may have an increased risk of getting cancer.
Max RAA 3.9
Chloramines ppm [4] [4] NA Range 0.44-2.9 Drinking water disinfectant added for treatment Some people who use water containing chloramines well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chloramines well in excess of the MRDL could Max RAA 1.64 experience stomach discomfort or anemia.
Max RAA 1.64
Control of DBP precursors (TOC) ppm TT NA 0.3 Range 1.9-2.8 Various natural and manmade sources Total organic carbon (TOC) has no health effects. However, total organic carbon provides a medium for the formation of disinfection byproducts. These byproducts include trihalomethanes (THMs) and haloacetic acids (HAAs). Drinking water containing these byproducts in excess of the MCL may lead to adverse health effects, liver or kidney problems, or nervous system effects, and may lead to an increased risk of cancer.
Average 2.4

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Key to Abbreviations


Extended Abbreviations


Footnotes

(a) The turbidity level of the filtered water shall be less than or equal to 0.3 NTU in 95% of the measurements taken each month and shall not exceed 1 NTU at any time. Turbidity, a measure of the cloudiness of the water, is an indicator of treatment performance. The averages and ranges of turbidity shown in the Secondary Standards were based on the treatment plant effluent.

(b) Total coliform MCLs: No more than 5.0% of the monthly samples may be total coliform-positive. Compliance is based on the combined distribution system sampling from all the treatment plants. In 2012, 1593 samples were analyzed and one was positive for total coliforms. The MCL was not violated.

(c) E. coli MCL: The occurrence of two consecutive total coliform-positive samples, one of which contains E. coli, constitutes an acute MCL violation. The MCL was not violated.

(d) State MCL is 45 mg/L as nitrate, which is the equivalent of 10 mg/L as N.

(e) Fluoride, nitrate, perchlorate, and TDS are a part of Corona’s blending remediation plan to reduce the levels being delivered to the consumer’s tap. Refer to the “Treated Average System Water” column for a more accurate representation of system water quality.

(f ) The high concentration of Manganese is from two groundwater wells; the City utilizes over 20 wells. Refer to the “Treated Average System Water” column for a more accurate representation of system water quality.

(g) Unregulated contaminant monitoring helps the USEPA and CDPH determine where certain contaminants occur and whether the contaminants need to be regulated.

(h) The City of Corona was in compliance with all provisions of the State’s Fluoridation System Requirements. This is part of the City of Corona’s blending plan to reduce the levels of fluoride being delivered to the consumers’ tap. Refer to the “Treated Average System Water” column for a more accurate representation of system water quality.

(i) Perchlorate reporting level is 4 ppb.

(j) Data collected from four consecutive quarters of monitoring.

(k) This constituent was detected at high levels exceeding the MCL at the highlighted source. Please note that this water is blended with water from other sources to provide customers with the highest quality drinking water.

(l) Bromate reporting level is 3 ppb and reported from Mills Filtration Plant Metropolitan Water District (MWD). Mills MWD water is blended with other Corona water sources. Please note that this water is blended with water from other sources to provide customers with the highest quality drinking water.

(m) The City of Corona was in compliance with all provisions of the Stage 1/Stage 2 Disinfectants and Disinfection Byproducts Rules (D/DBPR). Stage 2 D/DBPR monitoring began in the 2nd quarter. Compliance was based on the RAA. (n) Reporting level is 0.5 ppb for each of the trihalomethanes (bromodichloromethane, bromoform, chloroform, and dibromochloromethane).

(o) DLR is 1.0 ppb for each of the following: dichloroacetic acid, trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid; and 2.0 ppb for monochloroacetic acid.

(p) The sources that were detected for Boron are all directed to the Temescal Desalter for reverse osmosis treatment. The treated water is monitored at the effluent of the facility which is represented in the “Treated Average System Water” column.

(q) Chromium VI reporting level is 1 ppb.

(r) Hardness is the sum of polyvalent cations present in the water, generally magnesium and calcium. The cations are usually naturally occurring.

(s) Sodium refers to the salt present in the water and is generally naturally occurring.

(t) Total Dissolved Solids (TDS) is a measure of the total amount of all the materials that are dissolved in water. These minerals, both natural and anthropogenic (made by humans), are mainly inorganic solids, with a minor amount of organic material.

(u) Aluminum has a secondary standard limit. In 2014 the secondary standard limit was exceeded at our Treatment Facility effluent with a Maximum Running Annual Average (Max RAA) of 287 ug/L. No consumer action is necessary since secondary standards for aluminum are established only for aesthetic effects (water color). We are continually calibrating our aluminum base coagulant to achieve the non mandatory secondary standard limit of 200 ug/L. We expect to achieve this limit by the end of 2015. Our current Max RAA for 2015 is 217 ug/L.

(v) Data was collected in 2014 and reported per UCMR3 guidance. Minimum reporting levels are as stipulated in the Federal UCMR 3. List 1 – Assessment Monitoring consists of 21 chemical contaminants for which standard analytical methods were available. List 2 – Screening Survey consists of 7 contaminants for which new analytical methods were used. All analyses conducted by contract laboratories. Values listed in state DLR column are federal minimum reporting levels.

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Frequently Asked Questions

Español: Este informe contiene información muy importante sobre su agua potable. Visite la siguiente página desde el 1ro de Julio y use la opción del traductor para traducir el informe en el idioma de su preferencia: www.CoronaDWP.org/CCRtranslation.

If you are interested in participating in decisions that affect the quality and supply of the water in the City of Corona, or for general information about this report and questions related to water quality, please call 951-736-2234.

Regular City Council meetings are held on the first and third Wednesday of every month.