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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.