report in two hours

202 ALTER QUAA20 W REPOYLIT TOR

Questions about your water? Contact us for answers.

If you have questions about this report, please call Lars Oldewage, IRWD water

quality manager, at 949-453-5858. To reach IRWD Customer Service

and for other infor mation, please call 949-453-5300,

or email [email protected].

Community participation The IRWD Board of Directors meets the second and fourth Monday of each month beginning at 5 p.m. at IRWD, 15600 Sand Canyon Avenue, Irvine, California 92618.

A copy of this report is also available on our website: IRWD.com. For more informa - tion about the health effects of the listed contami nants in the following tables, call the U.S. EPA Safe Drinking Water Hotline at 800-426-4791.

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Ce rapport contient des informations importantes sur votre eau potable. Traduisez-le ou parlez en avec quelqu’un qui le comprend bien.

Der Bericht enthält wichtige informationen über die Wasser - qualität in Ihrer Umgebung. Der Bericht sollte entweder offiziell uebersetzt werden, oder sprechen Sie mit Freunden oder Bekannten, die gute Englischkenntnisse besitzen.

Este informe contiene informa ción muy importante sobre su agua potable. Para mas información ó traducción, favor de contactar a Customer Service Repre senta tive. Telefono: 949-453-5300.

Questo rapporto contiene informazioni inportanti che riguardano la vostra aqua potabile. Traducetelo, o parlate con una persona qualificata in grado di spiegarvelo.

This report contains important information about your drinking water. Translate it,

or speak with someone who understands it.

IRWD 2020 Water Quality Report of Southern California (MWD), which supplies imported treat -

ed surface water; and IRWD, which operates a local surface

water treatment plant and several ground water treatment

plants, all test for unregu lated chemicals in our water supply.

Unregulated chemical monitoring helps U.S. EPA and DDW

deter mine where certain chemicals occur

and whether new standards need to be

established for those chemicals.

Through drinking water quality

compliance testing programs carried out

by OCWD (groundwater), MWD (treated

surface water) and IRWD (treatment

plants and the distribution system), your

drinking water is constantly monitored

from source to tap for regulated and unregulated constituents.

The state allows drinking water agencies to monitor for some

contaminants less than once per year because the concen tra -

tions of these contaminants do not change frequently. Some

data, though represen tative, is more than one year old.

Since 1990, California public water utilities have provided

an annual water quality report to their customers. This year’s

report covers calendar year 2019 drinking water quality

testing and reporting. Irvine Ranch Water District (IRWD)

vigilantly safe guards its water supply and, as in years past, the

water delivered to your home meets

the quality standards required by federal

and state regulatory agencies. The U.S.

Environ mental Protection Agency

(U.S. EPA) and the State Water Resources

Control Board, Division of Drinking Water

(DDW) are the agencies responsible

for establishing and enforcing drinking

water quality standards.

IRWD and other regional water suppliers frequently go beyond

what is required by testing for unregulated chemicals that may

have health risks but do not have drinking water standards.

For example, the Orange County Water District (OCWD), which

manages the groundwater basin; the Metro politan Water District

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The quality of your water is our primary concern

Sources of supply IRWD is committed to providing a clean and reliable

water supply for its customers. Our drinking water is a blend of ground water from the Orange County Groundwater Basin and surface water import ed by the Metropolitan Water District. MWD’s imported water sources come from the State Water Project and the Colorado River Aqueduct. Local ground water is pumped from a natural under ground reservoir that stretches from the Prado Dam and fans across the north western portions of Orange County, stretching as far south as the El Toro “Y.” Additional source waters come from the Harding Canyon Dam watershed and the Santiago Creek Dam watershed. Local ground water comprises approxi - mately 65% of the total IRWD drink ing water supply.

Basic information about drinking water contaminants

Drinking water sources (both tap and bottled water) may include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the surface of land or through the layers of the ground, it dissolves naturally occur ring minerals and, in some cases, radio active material, and can pick up substances resulting from the presence of animal and human activity.

Contaminants that may be present in source water include: • Microbial contaminants, such as viruses and bacteria,

which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.

• Pesticides and herbi cides, which may come from a variety of sources such as agriculture, urban stormwater runoff and residential uses.

• Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production or mining activities.

• Inorganic contaminants, such as salts and metals, which can be natur ally occurring or result from urban stormwater runoff, industrial or domestic sewage discharges, oil and gas production, mining and farming.

• Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gasoline stations, urban storm water runoff, agricultural application and septic systems.

To ensure that tap water is safe to drink, the U.S. EPA and DDW prescribe regulations that limit the amount of certain contami nants in water provided by public water systems. U.S. Food and Drug Administration regulations and California law also establish limits for contami nants in bottled water that provide the same protection for public health. Drinking water, including bottled water, may reason - ably 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 U.S. EPA Safe Drinking Water Hotline at 800-426-4791.

Safe from COVID-19 The coronavirus, SARS-CoV-2 (which leads to

the illness COVID-19), does not present a threat to our water supplies.

IRWD’s groundwater comes from deep wells, which do not contain viruses or other pathogenic organisms. Our imported surface water receives advanced water treatment that removes all microorganisms including viruses.

Additional information about COVID-19 and your water supply is available from the California Water Boards at bit.ly/cwb-covid.

The Eastern Branch of the California Aqueduct, part of the California State Water Project,

wends its way towards southern California.

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Information the U.S. EPA would like you to know

Drinking water fluoridation Fluoride has been added to U.S. drinking water supplies

since 1945. In Decem ber 2007, MWD joined a majority of the nation’s public water suppliers in adding fluo ride to drinking water to help prevent tooth decay. MWD was in compliance with all provisions of the State's fluoridation system requirements.

IRWD’s local ground water contains naturally occurring fluoride, but is not supplemented with fluoride. Fluoride levels in drinking water are limited under California state regulations at a maximum dosage of 2 parts per million.

There are many places to go for additional infor mation about the fluoridation of drinking water:

U.S. Centers for Disease Control and Prevention 800-232-4636 • cdc.gov/fluoridation

State Water Resources Control Board, Division of Drinking Water

waterboards.ca.gov/drinking_water/ certlic/drinkingwater/Fluoridation.html

American Water Works Association: awwa.org

For more information about MWD’s fluoridation program, please contact Edgar G. Dymally at 213-217-5709 or at [email protected].

Cryptosporidium Crypto sporidium is a micro scopic organism that, when

ingested, can cause diarrhea, fever, and other gastro intestinal symptoms.

The organism comes from animal and/or human waste and may be in surface water. MWD and IRWD tested the source waters and treated surface waters for Crypto sporidium in 2019 and did not detect it.

If detected in any drinking water samples, Crypto sporidium is eliminated by an effective treatment combination including sedi men tation, filtration and disinfection.

The U.S. EPA and the federal Centers for Disease Control guidelines on appropriate means to lessen the risk of infection by Crypto sporidium and other microbial con tami - nants are available from the U.S. EPA Safe Drinking Water Hotline at 800-426-4791.

Immuno-compromised people Some people may be more vulnerable to contaminants

in drinking water than the general population. Immuno- compro mised people, such as those with cancer who are undergoing chemo therapy, people who have had organ trans plants, people with HIV/AIDS or other immune system disorders, some elderly people and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers.

Total coliform rule This Consumer Confidence Report (CCR) reflects changes

in drinking water regula tory requirements instituted during 2016. All water systems are required to comply with the state Total Coliform Rule. Effective April 1, 2016, all water systems are also required to comply with the federal Revised Total Coliform Rule.

The new federal rule protects public health by ensuring the integrity of the drinking water distribution system by monitoring for the presence of microbials (i.e., total coliform and E. coli bacteria). U.S. EPA anticipates greater public health protection as the new rule requires water systems that are vulnerable to microbial contamination to identify and resolve potential issues. Water systems that exceed a specified frequency of total coliform occurrences are required to conduct an assessment to determine if any sanitary defects exist. If found, these must be corrected by the water system.

Chloramines Water imported from MWD and locally produced ground -

water contains chloramines, a combination of chlorine and ammonia, as a drinking water disinfectant. Chloramines effectively kill bacteria and other micro organisms that may cause disease.

Chloramines have no odor when used properly. People who use kidney dialysis machines may want to

take special precautions and consult their physician for the appro priate type of water treatment.

Customers who maintain fish ponds, tanks or aquariums should also make necessary adjust ments in water quality treatment, as these disinfectants are toxic to fish.

For further informa tion or if you have any questions about chlora mines please visit IRWD.com or call 949-453-5300.

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Want additional information? Explore water online.

Enjoy keeping in the know via social media? Follow IRWD’s water updates here:

Facebook Like Us: Irvine Ranch Water District

Twitter Follow us: @IRWDnews

Instagram Follow us: @IRWDnews

YouTube Watch us: youtube.com/IrvineRanchWD

About lead in tap water IRWD meets all standards for lead in the U.S. EPA Lead

and Copper Rule. If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing.

IRWD is responsible for providing high-quality drinking water, but cannot control the variety of materials used in plumbing compo nents. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. IRWD encourages you to collect the flushed water and reuse it for another beneficial purpose, such as watering potted plants.

Informa tion on lead in drinking water, testing methods, and

Water quality issues that could affect your health

steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at epa.gov/safewater/lead.

If you are concerned about lead in your water, you may wish to have your water tested.

Nitrate advisory Nitrate in drinking water at

levels above 10 mg/L is a health risk for infants of less than six months old. 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 10 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 are pregnant, you should ask advice from your health care provider.

There’s a wealth of information on the internet about drinking water quality, water reliability and water issues in general. A good place to begin your research is IRWD.com/water-report.

In addition to extensive information about your local water and the support and services we offer, you’ll find links to many other regional, statewide and national water resources.

You can also view “Journey of a Water Sample: How We Safeguard Your Water,” a short video depicting the steps IRWD staff take to ensure the high quality of our drinking water.

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Irvine Ranch Water District Local and Imported Drinking Water Quality Results for 2019 PHG Average Average Average MRDLG Local Treated Local Treated Imported MWD Range of MCL Typical Source Chemical MCL MRDL (MCLG) Groundwater Surface Water Treated Water Detections Violation? of Contaminant

Radiologicals – Tested in 2017 to 2019

Alpha Radiation (pCi/L) 15 (0) <3 <3 ND ND – 4.6 No Erosion of Natural Deposits Uranium (pCi/L) 20 0.43 <1 <1 ND ND – 2.8 No Erosion of Natural Deposits

Inorganic Chemicals – Tested in 2017 to 2019

Aluminum (ppm) 1 0.6 ND ND 0.12 (RAA) ND – 0.065 No Treatment Process Residue, Natural Deposits Arsenic (ppb) 10 0.004 <2 ND ND ND – 2.6 No Erosion of Natural Deposits Barium (ppm) 1 2 ND <0.10 ND ND – 0.11 No Erosion of Natural Deposits Bromate (ppb) 10 0.1 NR NR 2.0 ND – 5.9 No Byproduct of Drinking Water Ozonation Chlorine (ppm) 4.0 4 NR 2.1 NR 0.98 – 2.6 No Drinking Water Disinfectant Added for Treatment Chlorine Dioxide (ppb) 800 800 NR <20 NR ND – 280 No Drinking Water Disinfectant Added for Treatment Chlorite (ppm) 1 0.05 NR 0.066 NR ND – 0.086 No Erosion of Natural Deposits Fluoride (ppm) naturally-occurring 2 1 0.45 0.21 NR ND – 1.6 No Erosion of Natural Deposits Fluoride (ppm) treatment-related 2 1 NR NR 0.7 0.1 – 0.9 No Water Additive for Dental Health Nitrate (ppm as N) 10 10 <0.4 <0.4 0.5 ND – 5.6 No Fertilizers, Septic Tanks Nitrate+Nitrite (ppm as N) 10 10 <0.4 <0.4 0.5 ND – 5.6 No Fertilizers, Septic Tanks Selenium (ppb) 50 30 <5 ND ND ND – 6.2 No Fertilizers, Septic Tanks

Secondary Standards* – Tested in 2017 to 2019

Aluminum (ppb) 200* 600 ND ND 124 (RAA) ND – 65 No Treatment Process Residue, Natural Deposits Chloride (ppm) 500* n/a 26 43 56 13 – 101 No Leaching from Natural Deposits; Seawater Influence Color (color units) 15* n/a <3 <3 <1 ND – 10 No Naturally-Occurring Organic Substances Odor (TON) 3* n/a 1 2 <1 ND – 8 No Naturally-Occurring Organic Materials Iron (ppb) 300* n/a <100 ND ND ND – 205 No Leaching from natural deposits; industrial wastes Manganese (ppb) 50 * n/a <20 ND ND ND – 26 No Leaching from natural deposits; industrial wastes Specific Conductance (µmho/cm) 1,600* n/a 445 720 514 379 – 968 No Ions in Water; Seawater Influence Sulfate (ppm) 500* n/a 62 149 91 3.2 – 294 No Runoff or Leaching from Natural Deposits Surfactants (ppb) 500 n/a ND <50 ND ND – 55 No Leaching from natural deposits; industrial wastes Total Dissolved Solids (ppm) 1,000* n/a 261 461 304 116 – 606 No Runoff or Leaching from Natural Deposits Turbidity (NTU) 5* n/a 0.17 <0.10 ND ND – 1.2 No Erosion of Natural Deposits

Unregulated Contaminants – Tested in 2017 to 2019

Alkalinity, Total (ppm as CaCO3) Not Regulated n/a 156 163 72 60 – 228 n/a Runoff or Leaching from Natural Deposits Bicarbonate (ppm as HCO3) Not Regulated n/a 186 198 NR 74 – 235 n/a Runoff or Leaching from Natural Deposits Boron (ppm) NL = 1 n/a <0.10 <0.10 0.12 ND – 0.19 n/a Runoff or Leaching from Natural Deposits Bromide (ppm) Not Regulated n/a <0.10 ND NR ND – 0.19 n/a Runoff or Leaching from Natural Deposits Calcium (ppm) Not Regulated n/a 40 74 30 2.6 – 124 n/a Runoff or Leaching from Natural Deposits Carbonate (ppm) Not Regulated n/a 2.4 <0.6 NR ND – 21 n/a Runoff or Leaching from Natural Deposits Chlorate (ppb) NL = 800 n/a NR NR 55 55 n/a Byproduct of Drinking Water Chlorination Corrosivity (Aggressiveness) Not Regulated n/a 11.8 12.2 12.1 10.6 – 12.8 n/a Elemental Balance in Water Corrosivity (Langlier Index) Not Regulated n/a 0.05 0.33 0.43 (-)1.1 – 0.84 n/a Elemental Balance in Water Hardness, Total (ppm as CaCO3) Not Regulated n/a 135 277 127 7.6 – 439 n/a Runoff or Leaching from Natural Deposits Hardness, Total (grains/gal) Not Regulated n/a 7.9 16 7.4 0.4 – 26 n/a Runoff or Leaching from Natural Deposits Hexavalent Chromium (ppb) Not Regulated 0.02** <1 ND ND ND – 1.4 No Erosion of Natural Deposits; Industrial Discharge Magnesium (ppm) Not Regulated n/a 8.7 22 14 ND – 31 n/a Runoff or Leaching from Natural Deposits Molybdenum (ppb) Not Regulated n/a NR 1.0 NR ND – 2.0 n/a Drinking Water Treatment Chemical for Aesthetic Quality ortho-Phosphate (ppm) Not Regulated n/a <0.31 NR NR ND – 0.46 n/a Drinking Water Treatment Chemical for Aesthetic Quality pH (pH units) Not Regulated n/a 8.1 7.8 8.4 7.2 – 8.7 n/a Acidity, Hydrogen Ions” Potassium (ppm) Not Regulated n/a 1.7 2.4 2.8 0.6 – 4.4 n/a Runoff or Leaching from Natural Deposits Sodium (ppm) Not Regulated n/a 61 46 56 23 – 121 n/a Runoff or Leaching from Natural Deposits Total Organic Carbon (ppm) TT n/a 0.71 2.5 2.4 ND – 6.7 TT Various Natural and Man-Made sources Vanadium (ppb) NL = 50 n/a 3.0 <0.5 ND ND – 8.3 n/a Runoff or Leaching from Natural Deposits

Turbidity – combined filter effluent Treatment Technique Turbidity Measurements TT Violation? Typical Source of Contaminant

Baker Water Treatment Plant 1) Highest single turbidity measurement 0.1 NTU 0.034 No Soil Run-Off 2) Percentage of samples less than 0.3 NTU 95% 100% No Soil Run-Off Manning Water Treatment Plant 1) Highest single turbidity measurement 0.2 NTU 0.090 No Soil Run-Off 2) Percentage of samples less than 0.3 NTU 95% 100% No Soil Run-Off Metropolitan Water District Diemer Filtration Plant 1) Highest single turbidity measurement 0.3 NTU 0.05 No Soil Run-Off 2) Percentage of samples less than 0.3 NTU 95% 100% No Soil Run-Off

Unregulated Chemicals Requiring Monitoring at Entry Points to the Distribution System Chemical Notification Level PHG Average Local and Imported Range of Detections Most Recent Sampling Date

Bromide (ppm) n/a n/a 0.19 0.025 – 0.72 2019 Germanium, Total (ppb) n/a n/a <0.3 ND – 0.8 2019 Manganese, Total (ppb)*** SMCL = 50 n/a 1.2 ND – 2.7 2019 Total Organic Carbon (ppm) n/a n/a 1.3 0.17 – 6.5 2019

SMCL = Secondary Maximum Contaminant Level (for aesthetic water quality) ***Total manganese was included as part of the unregulated chemicals requiring monitoring.

Turbidity is a measure of the cloudiness of the water, an indication of particulate matter, some of which might include harmful microorganisms. Low turbidity in Metropolitan’s treated water is a good indicator of effective filtration. Filtration is called a “treatment technique” (TT).

A treatment technique is a required process intended to reduce the level of contaminants in drinking water that are difficult and sometimes impossible to measure directly.

Your water has been tested for many more chemicals than are listed above, including metals (such as mercury), pesticides, volatile organics and PFAS compounds. Chemicals not detected in any water sources are not included in the table. *Contaminant is regulated by a secondary standard to maintain aesthetic qualities (taste, odor, color). **There is currently no MCL for hexavalent chromium. The previous MCL of 10 ppb was withdrawn on September 11, 2017.

ppb = parts-per-billion; ppm = parts-per-million; pCi/L = picoCuries per liter; NTU = nephelometric turbidity units; ND = not detected; n/a = not applicable; NR = not required to be tested; NL = Notification Level; < = average is less than the detection limit for reporting purposes; MCL = Maximum Contaminant Level; (MCLG) = federal MCL Goal; PHG = California Public Health Goal; µmho/cm = micromho per centimeter; TT = Treatment Technique; RAA = Highest Running Annual Average

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Chart legend What are water quality standards?

Drinking water standards established by U.S. EPA and DDW set limits for substances that may affect consumer health or aesthetic qualities of drinking water. The chart in this report shows the following types of water quality standards: • Maximum Contaminant Level (MCL): The highest level of a contaminant

that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible.

• Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

• Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.

• Primary Drinking Water Standard: MCLs for conta mi nants that affect health along with their monitoring and reporting requirements and water treatment requirements.

• Regulatory Action Level (AL): The concen tra tion of a contaminant, which, if exceeded, triggers treatment or other requirements that a water system must follow.

What is a water quality goal? In addition to mandatory water quality standards, U.S. EPA and DDW have set

voluntary water quality goals for some con tami nants. Water quality goals are often set at such low levels that they are not achievable in practice and are not directly measur able. Nevertheless, these goals provide useful guide posts and direction for water management practices. The chart in this report includes three types of water quality goals: • Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking

water below which there is no known or expected risk to health. MCLGs are set by U.S. EPA.

• Maximum Residual Disinfectant Level Goal (MRDLG): The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.

• Public Health Goal (PHG): The level of a con tami nant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.

How are contaminants measured? Water is sampled and tested throughout the year. Contaminants are measured in:

• Parts per million (ppm) or milligrams per liter (mg/L) • Parts per billion (ppb) or micrograms per liter (µg/L) • Parts per trillion (ppt) or nanograms per liter (ng/L)

2019 Irvine Ranch Water District Distribution System Water Quality MCL Average Range of MCL Typical Source Disinfection Byproducts (MRDL/MRDLG) Amount Detections Violation? of Contaminant

Total Trihalomethanes (ppb) 80 53*** 7.7 – 68 No Byproducts of Chlorine Disinfection Haloacetic Acids (ppb) 60 18*** 1.3 – 37 No Byproducts of Chlorine Disinfection Chlorite (ppm) 1 0.07 ND – 0.12 No Byproduct of Chlorine Dioxide used in Treatment Chlorine Residual (ppm) (4.0 / 4) 1.9 ND – 4.0 No Disinfectant Added for Treatment

Aesthetic Quality

Color (color units) 15* <3 ND – 30 No Erosion of Natural Deposits Turbidity (NTU) 5* 0.18 ND – 10 No Erosion of Natural Deposits Odor (threshold odor number) 3* <1 ND – 6 No Erosion of Natural Deposits

Other

Fluoride (mg/L) 2/0.8** 0.54 ND – 0.88 No Erosion of Natural Deposits, Water Treatment

Twelve locations in the distribution system are tested quarterly for total trihalomethanes and haloacetic acids; MRDL = Maximum Residual Disinfectant Level; MRDLG = Maximum Residual Disinfectant Level Goal 60 locations are tested monthly for color and odor, and weekly for chlorine residual and turbidity. *Contaminant is regulated by a secondary standard **MCL/Optimum Level for our climate ***Highest running annual average at any individual sample location.

Highest Monthly % MCL Typical Source Bacterial Quality MCL MCLG Positive Samples Violation? of Contaminant

Total Coliform Bacteria 5% 0 1.3% No Naturally Present in the Environment Heterotrophic Plate Count Bacteria 5% n/a 0.8% No Naturally Present in the Environment

No more than 5% of the monthly samples may be positive for total coliform bacteria. The occurrence of 2 consecutive total coliform positive samples, one of which contains fecal coliform/E. coli, constitutes an acute MCL violation. A system is in non-compliance if more than 5% of samples collected in a given month have Heterotrophic Plate Counts greater than 500 colony forming units per milliliter and no detectable chlorine residual.

Lead and Copper Action Levels at Residential Taps Action Level Public Health 90th Sites Exceeding AL / AL Typical Source (AL) Goal (PHG) Percentile Value Number of Sites Violation of Contaminant

Copper (ppm) 1.3 0.3 0.29 0/67 No Corrosion of Household Plumbing Lead (ppb) 15 0.2 <5 0/67 No Corrosion of Household Plumbing

The most recent lead and copper at-the-tap samples were collected from 67 residences in 2019. Lead was detected in 2 homes and copper was detected in 46 homes, but none of the samples for lead and copper exceeded the respective regulatory Action Level (AL). A regulatory Action Level is the concentration of a contaminant which, if exceeded in more than 10% of samples, triggers treatment or other requirements that a water system must follow.

No schools requested testing for lead in 2019.

Unregulated Chemicals Requiring Monitoring in the Distribution System Chemical Notification Level PHG (MCLG) Average Local and Imported Range of Detections Most Recent Sampling Date

Germanium, Total (ppb) n/a n/a 0.54 ND – 1.1 2019 Manganese, Total (ppb) SMCL = 50 n/a 1.8 0.8 – 2.2 2019 Bromochloroacetic Acid (ppb) n/a n/a 3.9 1.5 – 13 2019 Bromodichloroacetic Acid (ppb) n/a n/a 1.3 0.6 – 3.8 2019 Chlorodibromoacetic Acid (ppb) n/a n/a 1.0 0.4 – 2.5 2019 Dibromoacetic Acid (ppb) n/a n/a 2.5 0.9 – 7.0 2019 Dichloroacetic Acid (ppb) n/a (0) 4.9 1.7 – 25 2019 Monobromoacetic Acid (ppb) n/a n/a 0.3 ND – 1.2 2019 Monochloroacetic Acid (ppb) n/a (70) 0.2 ND – 3.8 2019 Trichloroacetic Acid (ppb) n/a (20) 1.3 ND – 10 2019

SMCL = Secondary Maximum Contaminant Level (for aesthetic quality)

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Source water assessments (IRWD) Baker Water Treatment Plant water assessment

The Baker Water Treatment Plant receives untreated surface water from MWD (see MWD water assessment above) and untreated surface water from Santiago Reservoir. The surface water assessment of Santiago Reservoir is provided by Serrano Water District, which also uses source water from Santiago Reservoir.

The most recent sanitary survey for Santiago Reservoir was updated in 2019. Water supplies from Santiago Reservoir are most vulnerable to septic systems and wildfires. The Source Water Assessment for Santiago Reservoir was completed in April 2001. The assessment was conducted for the Serrano Water District by Boyle Engineering Corporation with assistance from the Serrano Water District staff.

A copy of the complete assessment may be viewed at the IRWD Water Quality Department, 3512 Michelson Drive, Irvine. You may request a summary of the assessment by writing to District Secretary, Irvine Ranch Water District, 15600 Sand Canyon Avenue, Irvine, California 92618.

Groundwater assessment An assessment of the groundwater sources in the

Lake Forest service area of IRWD was completed in December 2002. This groundwater is considered most vulnerable to contamination from dry cleaners and sewer collection systems.

An assessment of the groundwater sources in the Dyer

Road Well Field was completed in July 2003. This ground - water is considered most vulner able to contamination from gas stations, historic gas stations, metal plating/

finishing/fabrication facilities, military installations and plastics/synthetics producers.

An assessment of the groundwater sources in the Wells 21-22 Desalter Project was completed in May 2009. This ground water is considered most vulnerable to contami nation from sewer collection

systems, automobile (gas stations), historic gas stations and underground storage tanks (confirmed leaking tanks).

An assessment of the groundwater sources in the Irvine Desalter Project was completed in March 2006. This groundwater is considered most vulnerable to contami nation from crop irrigation and fertilizers.

An assessment of the ground water source in the Orange Park Acres service area of IRWD was completed in March 2003. This ground water is consid ered most vulner - able to contamination from sewer collection systems.

An assessment of the ground water in the Santiago Canyon service area of IRWD was completed in January 2003. There have been no contami nants detected in the water supply, however the source is still considered vulner - able to conta mination from historical mining operations.

Copies of the complete assess ments may be viewed at the IRWD Water Quality Depart ment, 3512 Michelson Drive, Irvine. You may request a summary of the assessments by writing to District Secretary, Irvine Ranch Water District, 15600 Sand Canyon Avenue, Irvine, California 92618.

Imported (MWD) water assessment Every five years, MWD is required by DDW to

examine possible sources of drinking water contami - nation in its State Water Project and Colorado River source waters.

The most recent watershed sanitary surveys of its source water supplies from the Colorado River was updated in 2015 and the State Water Project was updated in 2016. Both source waters are exposed to stormwater runoff, recreational activities, wastewater discharges, wildlife, fires, and other watershed-related factors that could affect water quality.

Water from the Colorado River is consider ed to be most vulner able to contamination from recreation, urban/stormwater runoff, increasing urbanization in the watershed, and wastewater. Water supplies from Northern California’s State Water Project are most vulnerable to contamination from urban/storm water runoff, wildlife, agriculture, recreation, and wastewater.

U.S. EPA also requires MWD to complete one Source Water Assess ment (SWA) that uses infor mation collected in the watershed sanitary surveys. MWD completed its SWA in December 2002. The SWA is used to evaluate the vulnerability of water sources to contami - nation and helps determine whether more protective measures are needed.

A copy of the most recent summary of either Water - shed Sanitary Survey or the SWA can be obtained by calling MWD at 800-CALL-MWD (800-225-5693).

We live in a semi-arid, drought-prone environment and need to use our high-quality water supplies as efficiently as possible. Because about 60% of household water use occurs outdoors, it pays to focus on saving water outside. Here are some things you can do to reduce outdoor water use:

• Replace grass with drought-friendly landscaping, including permeable ground cover and hardscape. • Adjust watering times monthly to match the weather. Weather-based irrigation controller rebates are available.* • Water landscape before 8 a.m. or after 5 p.m. and avoid watering at windy times of the day. • Check irrigation systems for leaks and overspray, promptly repairing or adjusting the system as needed. • Apply mulch around trees, shrubs and flowers. Mulch also naturally reduces weed growth. • Replace sprinkler heads with rotating spray nozzles or convert to drip irrigation. Rotating spray nozzle

rebates are available.*

The IRWD RightScape program offers many other helpful resources, such as rebates, classes, training and efficient sprinkler and drip irrigation schedules. Visit RightScapeNow.com to learn more.

Live in an apartment or condo? There are still ways to save!

• Use a water-efficient clothes washer, dishwasher and shower nozzles. Clothes washer rebates are available.* • Run only full dishwasher and clothes washer loads. • Don’t wash or hose down hardscapes when you can sweep instead. • Take 5-minute instead of 10-minute showers and be sure to use a water-efficient shower head.

*Rebates available while funding lasts.

~ 8 ~

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