EVMWD 2023 Water Quality Report

Annual Consumer Confidence Report (CCR) or Water Quality Report

EVMWD.COM/CCR

Published July 1, 2024

ANNUAL WATER

QUALITY REPORT

2023

PAGE 1

Annual Water Quality Report 2023

Phone: 951-674-3146

Mon.-Thurs. 7:30 a.m. to 5:30 p.m.

Fri. 7:30 a.m. to 4:30 p.m.

STAY CONNECTED EVMWD.COM

Contents

Letter from the General Manager .........................................01

Key Updates ............................................................................02

Value of Water ........................................................................04

Water Sources .........................................................................05

District Overview in Numbers ...............................................06

How to Read Your Water Report .......................................... 07

About Your Water Quality Report .......................................08

Water Quality Report 2023 ....................................................12

PAGE 1

Annual Water Quality Report 2023

PAGE 2

PAGE 3

Annual Water Quality Report 2023

“Public health

and reliability

remain our top

priorities.”

General Manager

LETTER FROM THE

As General Manager, I proudly present you with the 2023

annual water quality report. I oversee the delivery of safe, clean

drinking water to our community, prioritizing transparency and

accountability. This report demonstrates our commitment to

keeping you informed about the water quality from your tap.

Water quality ensures equity and access to high-quality

water for all. We uphold the highest standards to serve

every customer. Using diverse water sources and advanced

treatment processes, we produce the cleanest and safest

drinking water while prioritizing sustainability through

conservation initiatives and long-term planning.

Our mission at Elsinore Valley Municipal Water District

(EVMWD) is to deliver total water management

solutions that empower the health and vibrancy of our

communities, so that life can flourish. This report is

evidence of our dedication to fulfilling this mission.

Public health and reliability remain our top priorities. We

monitor water quality regularly and respond promptly to

maintain the integrity of our supply. The Safe Drinking

Water Act, which is the main federal law ensuring the

quality of Americans' drinking water, authorizes the United

States Environmental Protection Agency (U.S. EPA) to set

national health-based standards for drinking water. These

standards protect against both naturally occurring and man-

made contaminants that may be found in drinking water.

Looking ahead, we are committed to enhancing the

value and resilience of our water system through ongoing

investments in infrastructure and technology. Our focus

on innovation and efficiency ensures our community

continues to have access to the highest quality water 24/7.

Thank you for your trust in EVMWD.

GREG THOMAS

General Manager

Elsinore Valley Municipal Water District

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SECURING TOMORROW’S WATER:

EVMWD Revamps Its Integrated Resource Plan

EVMWD revised its 2017 Integrated Resource Plan (IRP) to tackle future

water supply challenges. These include threats to groundwater, fluctuations in

imported water availability, regulatory mandates, and climate change impacts

over the next three decades. Factors like rapid service area growth, rising

costs, and concerns over contaminants prompted stakeholder engagement to

define objectives. These focus on enhancing water supply reliability, ensuring

quality, and promoting sustainability. Our Climate Adaptation Plan will

further strengthen our efforts, ensuring our water systems are prepared to

face the challenges posed by climate change. Through adaptive management,

EVMWD aims to effectively implement the IRP, prioritizing investments in

locally controlled water supplies to mitigate shortages and ecosystem impacts.

SAFEGUARDING YOUR WATER:

EVMWD Acts Against PFAS Contamination

In the Elsinore Valley Municipal Water District (EVMWD) service area and

throughout communities statewide, concerns are mounting over the presence

of per- and polyfluoroalkyl substances (PFAS) in local water supplies. In

2019, EVMWD responded proactively by temporarily shutting down the

Canyon Lake Water Treatment Plant (CLWTP) upon detecting PFAS in the

source water, originating from the watershed, including runoff, and industrial

activities. PFAS, notorious for their persistent environmental presence,

pose significant challenges to maintaining water quality standards.

EVMWD is actively addressing PFAS contamination while ensuring fiscal

responsibility and adherence to water quality standards. Recognizing the imperative

of maintaining high standards, EVMWD allocated critical funding for CLWTP

upgrades. Following a thorough 9-month pilot study in 2020, EVMWD identified

an effective solution: a double-barrier approach utilizing granular activated

carbon (GAC) and ion exchange to enhance water treatment capabilities.

Despite anticipated costs surpassing $80 million, EVMWD remains resolute in

implementing CLWTP upgrades, scheduled to commence construction in late

2024 and conclude by 2027. This underscores EVMWD’s steadfast commitment to

delivering safe, dependable drinking water while responsibly managing resources.

Fortifying Local Resources: Lee Lake Wells

The Lee Lake Wells project aims to enhance the local water supply with an estimated

cost of $11.6 million. The project involves installing two new wells, PFAS treatment

infrastructure with advanced GAC technology, and a pump station. Benefiting

from a regional grant cost share, this initiative will ensure the production of safe,

reliable, and compliant water, strengthening local water resources' resilience.

KEY UPDATES

Exceptional

service

Increasing local

water supplies

Investing in

infrastructure

180 full time highly skilled

employees deliver water and

manage wastewater reliably,

efficiently and safely.

Investing in partnerships

and future supplies

remains a top priority.

Planning ahead to build and invest

in projects is a daily practice that

underscores our dedication to

anticipating and addressing the

evolving needs of our community,

ensuring sustainable growth and

prosperity for generations to come.

PAGE 6

Clean, safe water fuels our health, economy and daily lives. We recognize the critical need for dependable access to

clean, safe water and dedicate ourselves to delivering it to our customers' homes and businesses without fail. Since

1950, EVMWD has supplied water continuously, providing reliable service. Sourcing, treating, and delivering water

safely to your tap demands substantial resources, expertise, and funding. EVMWD consistently delivers exceptional

value to our customers 24 hour per day, seven days a week.

Exceptional Value

More than half of our water originates from snowpack and

rain hundreds of miles away. This water fills reservoirs

or groundwater basins and travels through extensive

pipelines before it arrives at your faucet. Successfully

completing this journey requires energy, robust physical

infrastructure, and human expertise. This comprehensive

process ensures clean and safe water for your daily use.

Our Commitment to Our Customers

We invest in vital infrastructure, perform routine

maintenance, and conduct water quality testing to guarantee

that the water reaching your home or business is clean,

safe, and dependable. EVMWD certifies and educates

our staff to ensure top-tier water service quality.

THE VALUE OF

EVMWD WATER SERVICES

At EVMWD, we are passionate about our

work and deeply value the communities

we serve. We acknowledge and appreciate

our customers' commitment to wise water

usage and encourage this practice to endure

long-term. Deliberate management of water

use is crucial for optimizing and enhancing

water service efficiency.

THANK YOU

EVMWD WATER SOURCES

WHERE DOES EVMWD

WATER COME FROM?

35%

Our imported water comes from the State

Water Project in Northern California and the

Colorado River Aqueduct. This water travels

through canals, pump stations and pipelines to

Metropolitan Water District of Southern California

and continues through the same means to our

facilities at EVMWD.

65%

IMPORTED WATER

LOCAL WATER

Our local water is pumped from groundwater

wells and from the surface water

reserve in Canyon Lake (currently offline).

PAGE 8

DISTRICT OVERVIEW

IN NUMBERS

EVMWD prioritizes water reliability 24/7 for over 163,000 residents across 98 square miles. Proactive

master plans for regular maintenance and emergency responses swiftly address unexpected repairs. Our

dedicated Operations team works tirelessly to ensure dependable water services for all EVMWD customers.

8,000 +

WATER SYSTEM

DAMS

IMPORT

CONNECTIONS

DRINKING

WATER PLANTS

STORAGE TANKS

PRESSURE

ZONES

WATER SYSTEM

SAMPLE POINTS

145

PUMP STATIONS

ACTIVE

WELLS

FIRE HYDRANTS

MAINTAINED

What does DLR mean?

DLR stands for Detection Limits for Purposes of Reporting.

DLRs are levels for constituents set by SWRCB-DDW

based on scientific testing capabilities. Values below

DLR are reported "ND," meaning "Not-Detected."

TIP: Utilize the DLR when “ND” is listed in the tables to

determine the highest value possible for a constituent.

What is the Maximum

Contaminant Level (MCL)?

The MCL is the highest level of a contaminant that is allowed

in drinking water, as determined by regulatory standards.

To evaluate a contaminant, review the report tables, find the

specific contaminant, and check its allowable MCL. Next,

compare this MCL to the level listed in the data chart.

TIP: Compare the MCLs for each contaminant to the levels

noted in the data charts. MCLs are drinking water standards,

i.e; required limits, while PHGs are recommendations.

What does the PHG column mean?

The PHG column represents the Public Health Goals

set by the California Environmental Protection Agency.

These goals indicate the level at which a contaminant

poses no known or expected health risks.

TIP: Compare the PHGs for each contaminant to the

levels noted in the data charts. Public Health Goals can

differ from MCLs and not all PHGs have a corresponding

maximum level stated. MCLs are drinking water standards,

i.e; required limits, while PHGs are recommendations.

What does ND mean?

ND means the constituent being tested

was “Not Detected" above DLR.

Reading this Water Quality Report

doesn’t have to be complicated.

This report contains information from over 34,877 water quality

tests collected during the 2023 calendar year. We've made it

straightforward, so you can quickly understand the key details

about your water's quality and safety.

HOW TO READ YOUR

WATER QUALITY REPORT

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Annual Water Quality Report 2023

We have enclosed our compilation of the 2023 water quality testing

for your review. The State Water Resources Control Board, Division

of Drinking Water (SWRCB-DDW), sets testing frequency and

water quality levels. EVMWD aims to provide safe drinking water

to customers and adheres to policies and procedures established

by the State of California and U.S. EPA. EVMWD ensures chlorine

disinfectant residuals in drinking water as mandated by SWRCB-DDW

and U.S. EPA regulations.

SWRCB-DDW required assessments of drinking water sources

were completed. Copies of these source assessments are available at

EVMWD. According to State guidelines, certain EVMWD wells are vulnerable to activities such as airports, gravel

mining, machine shops, maintenance yards, septic systems, sewer collection systems, and transportation corridors,

each potentially contributing to detections of Nitrate, PFAS, and other constituents. The wells that detected

contaminants in their raw water during 2023 include Summerly, Station 71, Flagler 2A, Flagler 3A, Canyon Lake,

Diamond, Cereal 1, Cereal 3, Cereal 4, Corydon, and Joy wells. These wells underwent blending or treatment as

permitted by the State. Water deliveries to the distribution system met all State drinking water quality standards.

PFOA: Detected above RL (Response Level) of 10 ppt in Summerly Well,

Station 71 Well, Flagler 2A Well, Flagler 3A Well, and Canyon Lake (Raw

Water); detected above NL of 5.1 ppt in Diamond Well

PFOS: Detected above NL of 6.5 ppt in Summerly Well, Diamond Well,

Cereal 1 Well, Station 71 Well, Flagler 2A Well, Flagler 3A Well, and

Canyon Lake (Raw Water)

PFHxS: Detected above RL of 20 ppt in Summerly Well; detected above NL

of 3 ppt in Cereal 4 Well, Diamond Well, Cereal 1 Well, Corydon Well, Station

71 Well, Flagler 2A Well, Flagler 3A Well, and Canyon Lake (Raw Water)

Vanadium: Detected above NL of 50 ppb (Naturally

Occurring) in Cereal 3 Well, Cereal 4 Well, Cereal 1 Well,

and Corydon Well

Nitrate: Detected above MCL of 10 ppm (Naturally

Occurring) in Flagler 2A Well; detected above AL of 5

ppm in Flagler 3A Well and Terra Cotta Well

Arsenic: Detected above MCL of 10 ppb (Naturally

Occurring) in Cereal 3 Well, Cereal 4 Well, Cereal 1 Well,

Corydon Well, and Joy Well

AVERAGE:

The average reported in the data is the combined

result of multiple collection samples.

MAXIMUM CONTAMINANT LEVEL (MCL):

The highest level of a contaminant that is allowed in

drinking water. Primary MCLs are set as close to the Public

Health Goals (PHG) (or MCLGs) as is economically and

technologically feasible. Secondary MCLs are set to protect

the odor, taste and appearance of drinking water.

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 the U.S. EPA

MAXIMUM RESIDUAL DISINFECTANT LEVEL (MRDL):

The highest level of a disinfectant allowed in drinking water.

There is convincing evidence that the addition of a disinfectant

is necessary for control of microbial contaminants.

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.

NOTIFICATION LEVEL (NL):

A health-based advisory level established by the State for chemicals

in drinking water that lack maximum contaminant levels (MCLs).

WATER QUALITY TERMS

ABOUT YOUR

WATER QUALITY REPORT

Water Quality Administrator, Mike Ali

951-674-3146 x8256

hali@evmwd.net

REQUEST A SUMMARY

OF THE ASSESSMENT

Chemical Contaminant Detections in Sources

IMPORTANT FACTS FROM THE U.S. EPA ABOUT DRINKING WATER

Sources of drinking water, both tap and bottled, include rivers, lakes, streams, ponds, reservoirs, springs and

wells. As water travels over land or through the ground, it dissolves naturally occurring minerals, radioactive

material, and can pick up substances from animals or human activity.

CONTAMINANTS THAT MAY BE PRESENT IN UNTREATED SOURCES MAY INCLUDE:

Primary Contaminants adversely affect public health.

Secondary Contaminants may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects

(such as taste, odor or color) in drinking water.

The State allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants

do not change frequently. Some of our data, though representative, is more than one year old.

PRIMARY DRINKING WATER STANDARD (PDWS):

MCLs and MRDLs for contaminants that affect

health along with their monitoring and reporting

requirements, and water treatment requirements.

PUBLIC HEALTH GOAL (PHG):

The level of a contaminant in drinking water below which

there is no known or expected risk to health. PHGs are set

by the California Environmental Protection Agency.

REGULATORY ACTION LEVEL (AL):

The concentration of a contaminant which, if exceeded, triggers

treatment or other requirements that a water system must follow.

TREATMENT TECHNIQUE (TT):

A required process intended to reduce the level

of a contaminant in drinking water.

TURBIDITY:

A measure of the cloudiness of the water. It is a good

indicator of the effectiveness of our filtration system.

UNREGULATED CONTAMINANT

MONITORING RULE (UCMR):

Helps the U.S. EPA and SWRCB-DDW determine

where certain contaminants occur and whether

the contaminants need to be regulated.

Microbial contaminants (Primary):

Viruses and bacteria that may come from

sewage treatment plants, septic systems,

agricultural livestock operations and

wildlife.

Inorganic contaminants (Primary

and Secondary): Salts and metals that

can be naturally occurring or result from

urban storm water runoff, industrial or

domestic wastewater discharges, oil and gas

production, mining or farming.

Pesticides and herbicides (Primary):

These may come from agriculture, urban

storm water runoff and residential uses.

Radioactive contaminants

(Primary): These can be naturally

occurring or result from oil and gas

production and mining activities.

Organic chemical contaminants

(Primary): These include synthetic and

volatile organic chemicals, byproducts

of industrial processes and petroleum

production, and can also come from

gas stations, urban storm water runoff,

agricultural application and septic systems.

To ensure water is safe to drink, the U.S. EPA and

SWRCB-DDW prescribe regulations that limit the

amount of certain contaminants in water provided by

public water systems. SWRCB-DDW regulations also

set limits for contaminants in bottled water to protect

public health.

Trace chemicals in water are typically measured in parts per million (ppm) and parts per billion

(ppb), which help us understand very small concentrations. They can also be measured in

parts per trillion (ppt).

PARTS PER MILLION (ppm)

Parts Per MILLION or Milligrams/Liter = 1 drop in 13.6 gallons

These measurements help us detect and manage even the tiniest concentrations.

PARTS PER BILLION (ppb)

Parts Per BILLION or Micrograms/Liter = 1 drop in 13,563 gallons

PARTS PER TRILLION (ppt)

Parts Per TRILLION or Nanograms/Liter = 1 drop in 13,563,368 gallons

PAGE 12

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Annual Water Quality Report 2023

Important Info from the U.S. EPA on Drinking Water

Drinking water, including bottled water, may contain small amounts of some contaminants. The presence of

contaminants does not necessarily indicate the water poses a health risk. More information about contaminants and

potential health effects can be obtained by calling the U.S. EPA’s Safe Drinking Water Hotline at 1-800-426-4791 or

visiting the U.S. EPA’s website at www.epa.gov. Trace chemicals are measured in parts per million (ppm), the same as

milligrams per liter (mg/L). Some constituents are measured in parts per billion (ppb), the same as micrograms per

liter (ug/L). Some constituents are measured in parts per trillion (ppt), the same as nanograms per liter (ng/L).

Some people may be more vulnerable to contaminants in drinking water than the general population. Those who may

be particularly at risk include cancer patients, organ transplant recipients, people with HIV-AIDS or other immune

system disorders, some elderly individuals, and infants. These people should seek advice about drinking water from

their health care providers. U.S. Centers for Disease Control & Prevention (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 at 1-800-426-4791 or by visiting water.epa.gov/Drink/Hotline.

ARSENIC

Your drinking water contains low levels of arsenic that fall within State and Federal health-based standards

and are below thresholds that would require corrective action. The U.S. Environmental Protection Agency

sets maximum levels for contaminants based on the best available treatment technology to remove them from

drinking water. The U.S. EPA continues to research the health effects of low levels of arsenic, a mineral known

to cause cancer in humans at high concentrations and linked to other health effects such as skin damage and

circulatory problems. In 2008, EVMWD completed construction on the Back Basin Groundwater Treatment

Facility that removes arsenic and other naturally occurring contaminants often found in groundwater.

LEAD

Since 2017, public schools have had the option to

request lead testing from local water agencies. New

regulations required these tests by July 1, 2019, for

all K-12 schools built before 2010. During 2018-19,

EVMWD tested drinking water at all K-12 public

schools in its service area, and none exceeded the

Action Level for lead. Elevated lead levels can cause

serious health problems, especially for pregnant

women and young children. Lead in drinking water

usually comes from service lines and home plumbing

materials. While EVMWD provides high-quality

drinking water, it cannot control the plumbing

materials used in homes.

To minimize lead exposure, flush your tap for 30

seconds to 2 minutes before drinking if the water has

been sitting for several hours. For more information

on lead in drinking water, testing methods, and ways

to reduce exposure, contact the Safe Drinking Water

Hotline at 1-800-426-4791 or visit www.epa.gov/

Safewater/Lead. In line with new federal regulations

released on Aug. 4, 2022, EVMWD is conducting a

lead and copper service line study. Although EVMWD

service lines do not contain lead, customer-side lines

may contain lead or steel, and older brass fixtures,

valves, or solder may also have lead. Homes built

before 1986 will be included in the survey. Throughout

2024, EVMWD staff will conduct the material survey

at service meters.

TDS

One of the most important issues facing water supplies

throughout Southern California today is salinity.

Total dissolved solids, a measure of salinity, includes

concentration of dissolved mineral salts such as calcium,

magnesium, sodium, sulfate, and chloride. Local water

supplies and recycled water have continued to show an

increase in salt content. Though these salts are viewed

as an aesthetic standard by the SWRCB-DDW, too

much salt can negatively impact our local water sources,

agriculture, and our environment. EVMWD is exploring

options on how to meet state-mandated requirements to

eliminate the overabundance of these salts.

RADON

Radon is a naturally occurring gas formed from the

normal radioactive decay of uranium. Radon has been

detected in our finished water supply. There are no

regulatory limits prescribed for radon levels in drinking

water. The pathway to radon exposure occurs primarily

through its presence in the air. Exposure over a long

period to air containing radon may cause adverse

health effects. If you are concerned about radon in

your home, testing is inexpensive and easy. For more

information, call your state radon program at 1-800-

745-7236, the National Safe Council’s Radon Hotline

at 1-800-SOSRADON or the U.S. EPA Safe Drinking

Water Act Hotline at 1-800-426-4791.

Note: EVMWD staff are currently surveying water service pipe materials to comply with State and Federal Lead and Copper

regulations. These surveys may continue beyond 2024. Many surveys will involve assessments at water meters with no

inconvenience to customers. Some surveys may cause service interruptions for additional verifications between the meter and

the dwelling structure. Residents will receive notifications.

REVISED TOTAL COLIFORM RULE

This water quality report reflects changes in drinking water

regulatory requirements during 2022. These revisions add

the requirements of the Federal Revised Total Coliform Rule,

effective since April 1, 2016, to the existing state Total Coliform

Rule. This rule protects public health by ensuring the integrity

of our drinking water distribution system and monitoring for

the presence of microbials, including total coliform and E. coli

bacteria. An additional benefit of this rule requires water systems

vulnerable to microbial contamination to identify and fix problems.

Water systems that exceed a specified frequency of total coliform

occurrences must conduct an assessment to determine if any

sanitary defects exist. If found, the water system must correct

these defects. The state Revised Total Coliform Rule became

effective July 1, 2021.

Understanding parts per million (ppm), parts per billion (ppb) and

parts per trillion (ppt) in water

ABBREVIATIONS

AI: Aggressiveness Index

AL: Action Level

Blending: Regulated mixing of

higher-quality water with lower

quality water to a calculated

ratio to meet or exceed approved

standards before delivery to

customers at the Entry Point to

Distribution System (EPTDS)

AVP: Auld Valley Pipeline (MWD

Skinner Water Treatment

Plant) treated water supply

CaCO3: Calcium Carbonate

CFU: Colony-Forming Units

DBP: Disinfection Byproducts

DDW: Division of Drinking Water

DLR: Detection Limits for

Purposes of Reporting

GPG: Hardness conversion

as grains per gallon - 1

GPG = 17.1 ppm as CaCO3

LRAA: Locational Running

Annual Average; highest

LRAA is the highest of all Locational Running

Annual Averages calculated as average of all

samples collected within a 12-month period

MBAS: Methylene Blue Active Substances

MCL: Maximum Contaminant Level

MCLG: Maximum Contaminant Level Goal

MFL: Million Fibers per Liter

MGL: Mills Gravity Line operated by WMWD

MRDL: Maximum Residual Disinfectant Level

MRDLG: Maximum Residual

Disinfectant Level Goal

MRL: Method Reporting Level

MWD: Metropolitan Water

District of Southern California

NA: Not Analyzed/Not Applicable

ND: Not Detected above State DLR

NL: Notification Level to SWRCB

NTU: Nephelometric Turbidity Units

pCi/L: picoCuries per Liter

PHG: Public Health Goal

PPB: parts per billion or

micrograms per liter (µg/L)

PPM: parts per million or

milligrams per liter (mg/L)

PPQ: parts per quadrillion or

picograms per liter (pg/L)

PPT: parts per trillion or

nanograms per liter (ng/L)

RAA: Running Annual Average;

highest RAA is the highest of all

Running Annual Averages calculated

as average of all the samples

collected within a 12-month period

Range: Results based on minimum

and maximum values collected

within a 12-month period

RL: Response Level to SWRCB

RTCR: Revised Total Coliform Rule

SCML: Secondary Contaminant

Level (Aesthetic Standard)

SI: Saturation Index (Langelier)

SWRCB: State Water

Resources Control Board

TON: Threshold Odor Number

TT: Treatment Technique is

a required process intended

to reduce the level of a

contaminant in drinking water

TVP: Temescal Valley Pipeline

(MWD Mills Water Treatment Plant)

and WMWD treated water supply

delivered via WMWD’s MGL.

µS/cm: microSiemen per

centimeter; or micromho per

centimeter (µmho/cm)

UCMR: Unregulated Contaminant

Monitoring Rule is used to collect

data for contaminants that

are suspected to be present in

drinking water and do not have

health-based standards set under

the Safe Drinking Water Act

WMWD: Western Municipal

Water District

CONSUMER CONFIDENCE REPORT 2023

As per SWRCB-DDW guidelines, the tables include only those contaminants that were detected during 2023 or prior sampling

years as applicable. It is important to note that the presence of these contaminants, as detected in the water, does not necessarily

indicate that the water poses a health risk. We are pleased to report that no drinking water violations occurred during the 2023

compliance period.

2023 EVMWD Drinking Water Distribution System Water Quality Summary

DISTRIBUTION SYSTEM RESULTS FOR COLIFORM BACTERIA

MICROBIOLOGICAL

CONTAMINANTS

HIGHEST NO.

OF DETECTIONS

AND (%)

NO. OF

MONTHS IN

VIOLATION

MCL

PHG,

MCLG

TYPICAL

SOURCE OF

BACTERIA

Total Coliform

Bacteria

1.2%

More than 5% samples in a month with a detection

Naturally

present in the

environment

E. coli

(state Total Coliform

Rule)

0.0%

A routine sample and a repeat sample detect

total coliform and either sample also detects fecal

coliform or E. coli

Human and

animal fecal

waste

E. coli (federal

Revised Total

Coliform Rule)

Routine and repeat samples are total coliform-

positive and either is E. coli-positive or system fails

to take repeat samples following E. coli-positive

routine sample or system fails to analyze total

coliform-positive repeat sample for E. coli.

Human and

animal fecal

waste

DISTRIBUTION SYSTEM RESULTS FOR DISINFECTANT RESIDUALS AND DISINFECTION BYPRODUCTS

CHEMICAL OR

CONSTITUENT

(REPORTING UNITS)

SAMPLE

YEAR

HIGHEST

LRAA AVG.

RANGE OF

DETECTIONS

MCL

PHG

(MCLG)

MCL, MRDL

VIOLATION

TYPICAL SOURCE OF

CONTAMINANT

Total Trihalometh-

anes-TTHMs (ppb)

2023

31.5

0-51

Byproduct of drinking

water chlorination

Haloacetic Acids-HAA5

(ppb)

2023

11.6

0-23

Byproduct of drinking

water chlorination

DISTRIBUTION SYSTEM RESULTS FOR LEAD AND COPPER RULE

LEAD AND

COPPER

RULE (AND

REPORTING

UNITS)

SAMPLE

YEAR

NO. OF

SAMPLES

COLLECTED

90TH

PERCENTILE

LEVEL

DETECTED

NO. SITES

EXCEEDING

PHG

DLR

TYPICAL SOURCE OF CONTAMINANT

Lead (ppb)

2022

1.2

0.2

Internal corrosion of household water

plumbing systems; discharges from industrial

manufacturers; erosion of natural deposits.

Copper

(ppm)

2022

0.22

1.3

0.3

0.05

Internal corrosion of household plumbing

systems; erosion of natural deposits; leaching

from wood preservatives

DISTRIBUTION SYSTEM RESULTS FOR OTHER PARAMETERS

CHEMICAL OR CONSTITUENT

(AND REPORTING UNITS)

SAMPLE

YEAR

AVERAGE

LEVEL

DETECTED

RANGE OF

DETECTIONS

MCL OR

(SMCL)

PHG

TYPICAL SOURCE OF CONTAMINANT

Heterotrophic Plate Count

(MPN/mL)

2023

24.4

0-738

Naturally present in the environment

Turbidity (NTU)

2023

0.3

0.07-2.4

(5)

Soil Runoff

Color

2023

1.0

0-20

(15)

Naturally occuring organic materials

Free Chlorine (ppm)

2023

1.1

0.02-2.6

MRDL

= 4.0

MRDLG

= 4.0

Drinking water disinfectant

added for treatment

Total Chlorine (ppm)

2023

1.8

0-4.7

MRDL

= 4.0

MRDLG

= 4.0

Drinking water disinfectant

added for treatment

Hardness (Total, mg/L as CaCO3)

2023

170.0

130-210

Total Dissolved Solids / TDS

(mg/L)

2023

380.0

260-500

1,000

pH (SU)

2023

8.0

6.99-8.96

6.5-8.5

Temperature (Degrees C)

2023

21.9

8.8-33.6

Alkalinity

(Total, mg/L as CaCO3)

2023

104

98-110

Odor (TON)

2023

FEDERAL UCMR 4 ANALYTE DETECTIONS

UNITS

ELSINORE SYSTEM

RANGE

AVERAGE

Bromide

ug/L

130-310

211

Bromochloroacetic acid

ug/L

ND-4.3

2.1

Bromodichloroacetic acid

ug/L

ND-2.4

1.0

Chlorodibromoacetic acid

ug/L

ND-2.1

0.7

Dibromoacetic acid

ug/L

ND-6.2

1.8

Dichloroacetic acid

ug/L

ND-5.7

2.5

Haloacetic acids 5 / HAA5

ug/L

ND-12

5.3

Haloacetic acids 6 / HAA6

ug/L

ND-19

6.1

Haloacetic acids 9 / HAA9

ug/L

ND-24

9.5

Manganese (total)

ug/L

ND-83

8.7

Monobromoacetic acid

ug/L

ND-1

0.1

Total Organic Carbon / TOC

mg/L

0.43-7.1

3.9

Tribromoacetic acid

ug/L

ND-4

0.4

Trichloroacetic acid

ug/L

ND-2.7

0.9

PAGE 16

ANALYTE NAME

UNITS OF

MEASURE

MCL/

sMCL

NL/

PHG

DLR

ATTRIBUTE

ELSINORE

GROUNDWATER

BLEND

TEMESCAL

VALLEY

PIPELINE BLEND

AULD VALLEY

PIPELINE BLEND

TEMESCAL

GROUNDWATER

BLEND

MCL

VIOLATION

MAJOR SOURCES IN DRINKING WATER

CLARITY

MWD-MILLS TP

MWD-SKINNER TP

TURBIDITY (Treatment Plant Combined Filter Effluent)

NTU

0.1

Highest

% Less Than 0.3

N/A

0.07

N/A

Soil Runoff

N/A

100%

N/A

TURBIDITY (Entry Points to Distribution System)

NTU

0.1

Range

0.19-1.9

0.18-0.87

ND-2.5

0.18-0.61

Soil Runoff

Average

0.47

0.39

0.12

0.37

INORGANIC CHEMICALS

ALUMINUM

ppb

1000,

200(s)

600

Range

ND-90

ND-180

ND-56

Residue from water treatment process; runoff

and leaching from natural deposits

Average

ARSENIC

ppb

0.004

Range

2.5-7.4

ND-4.0

ND-9.1

ND-2.2

Natural deposits erosion, glass and electronics production wastes

Average

4.4

BARIUM

ppb

1000

2000

100

Range

ND-150

ND-143

Oil and metal refineries discharge; natural deposits erosion

Average

FLUORIDE

ppm

0.1

Range

0.13-1.2

0.29-0.8

ND-0.8

0.29-0.31

Internal corrosion of household plumbing systems; erosion

of natural deposits; leaching from wood preservatives

Average

0.49

0.56

0.55

0.3

NICKEL

ppb

100

Range

ND-29

Erosion of natural deposits; discharge from metal factories

Average

NITRATE (as Nitrogen)

ppm

0.4

Range

ND-6.4

ND-6.9

ND-3.6

0.96-2.0

Runoff and leaching from fertilizer use; septic

tank and sewage; natural deposits erosion

Average

1.23

1.28

1.32

PERCHLORATE

ppb

Range

ND-2.5

Industrial waste discharge

Average

SELENIUM

ppb

Range

ND-17.0

ND-9.3

Refineries, mines, and chemical waste

discharge; runoff from livestock lots

Average

6.89

RADIOLOGICALS

GROSS ALPHA PARTICLE ACTIVITY

PCI/L

Range

ND-6.9

11.6-15.5

ND-10.6

11.6-15.5

Erosion of natural deposits

Average

GROSS BETA PARTICLE ACTIVITY

PCI/L

Range

6.1

ND-20.0

6.1

Decay of natural and man-made deposits

Average

6.1

RADIUM-228

PCI/L

0.019

Range

ND-1.8

ND-1.0

Erosion of natural deposits

Average

COMBINED URANIUM

PCI/L

0.43

Range

ND-5.5

8.0-15.0

ND-6.6

8.0-15.0

Erosion of natural deposits

Average

1.4

2.5

1.7

12.0

LEGEND:

* = Secondary Aesthetic Standard for Aluminium is 200 ppb

** = Includes Federal UCMR-5 monitoring results

PAGE 17

Annual Water Quality Report 2023

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