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Tap water quality report

Western Mwd

EPA monitoring tested this supplier for 42 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

42
contaminants tested
16
detected
86,062
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Local government
Counties served
Riverside

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfpea 0.0047 µg/L 2/12 2023
PFBS 0.0030 µg/L 1/12 2023
PFHXS 0.0034 µg/L 1/12 2023

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Dibromochloromethane
17 µg/L
No EPA limit set
 200/200 SYR4 2012–2019
TTHM
45 µg/L 56%
of the EPA limit 80 µg/L
 200/200 SYR4 2012–2019
Bromoform
15 µg/L
No EPA limit set
 197/200 SYR4 2012–2019
Bromodichloromethane
15 µg/L
No EPA limit set
 191/200 SYR4 2012–2019
Chloroform
19 µg/L
No EPA limit set
 159/200 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
52 µg/L 87%
of the EPA limit 60 µg/L
 113/193 SYR4 2012–2019
Dibromoacetic Acid
5.7 µg/L
No EPA limit set
 112/193 SYR4 2012–2019
Dichloroacetic Acid
7.7 µg/L
No EPA limit set
 84/193 SYR4 2012–2019
Monochloroacetic Acid
44 µg/L
No EPA limit set
 43/193 SYR4 2012–2019
Monobromoacetic Acid
4.1 µg/L
No EPA limit set
 42/193 SYR4 2012–2019
Lead
0.0013 mg/L 8.7%
of the EPA limit 0.0150 mg/L
 37/37 LCR 2025
Trichloroacetic Acid
7.9 µg/L
No EPA limit set
 24/193 SYR4 2012–2019
Lithium
16 µg/L
No EPA limit set
 1/12 UCMR-5 2023
26 contaminants tested, none detected
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Utility contact

Contact
RUGGE, PAUL
Phone
951-789-5155
Email
PRugge@wmwd.com

Frequently asked questions about Western Mwd

Is Western Mwd tap water safe to drink?

EPA monitoring detected 16 contaminants in Western Mwd's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Western Mwd's water?

EPA monitoring detected Dibromochloromethane, TTHM, Bromoform, Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Western Mwd serve?

Western Mwd reports serving 86,062 people in California, per its EPA record.

Has Western Mwd had any water quality violations?

The EPA has no formal drinking-water violations on file for Western Mwd.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.