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)
0%
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
80
NA
NA
Byproduct of drinking
water chlorination
Haloacetic Acids-HAA5
(ppb)
2023
11.6
0-23
60
NA
NA
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
AL
AL
PHG
DLR
TYPICAL SOURCE OF CONTAMINANT
Lead (ppb)
2022
80
1.2
15
0.2
Internal corrosion of household water
plumbing systems; discharges from industrial
manufacturers; erosion of natural deposits.
Copper
(ppm)
2022
80
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
TT
NA
Naturally present in the environment
Turbidity (NTU)
2023
0.3
0.07-2.4
(5)
NA
Soil Runoff
Color
2023
1.0
0-20
(15)
NA
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
NA
NA
Total Dissolved Solids / TDS
(mg/L)
2023
380.0
260-500
1,000
NA
pH (SU)
2023
8.0
6.99-8.96
6.5-8.5
NA
Temperature (Degrees C)
2023
21.9
8.8-33.6
NA
NA
Alkalinity
(Total, mg/L as CaCO3)
2023
104
98-110
NA
NA
Odor (TON)
2023
NA
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