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Tap water quality report

Western Mwd (Id a - Rainbow)

EPA monitoring tested this supplier for 12 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

12
contaminants tested
12
detected
192
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.

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
9.28 µg/L
No EPA limit set
worst single sample: 10 µg/L
33/33 SYR4 2015–2019
Bromoform
4.04 µg/L
No EPA limit set
worst single sample: 4.4 µg/L
33/33 SYR4 2015–2019
Chloroform
9.06 µg/L
No EPA limit set
worst single sample: 10 µg/L
33/33 SYR4 2015–2019
Dibromochloromethane
8.4 µg/L
No EPA limit set
worst single sample: 11 µg/L
33/33 SYR4 2015–2019
TTHM
27.6 µg/L 35%
of the EPA limit 80 µg/L
worst single sample: 32 µg/L
33/33 SYR4 2015–2019
Total Haloacetic Acids (HAA5)
15.8 µg/L 26%
of the EPA limit 60 µg/L
worst single sample: 34 µg/L
33/35 SYR4 2015–2019
Trichloroacetic Acid
4.02 µg/L
No EPA limit set
worst single sample: 4.4 µg/L
33/35 SYR4 2015–2019
Dichloroacetic Acid
6.225 µg/L
No EPA limit set
worst single sample: 7.1 µg/L
22/35 SYR4 2015–2019
Dibromoacetic Acid
2.505 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
20/35 SYR4 2015–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2024
Monochloroacetic Acid
20 µg/L
No EPA limit set
worst single sample: 25 µg/L
11/35 SYR4 2015–2019
Monobromoacetic Acid
1.3 µg/L
No EPA limit set
 1/35 SYR4 2015–2019

Utility contact

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

Frequently asked questions about Western Mwd (Id a - Rainbow)

Is Western Mwd (Id a - Rainbow) tap water safe to drink?

EPA monitoring detected 12 contaminants in Western Mwd (Id a - Rainbow)'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 (Id a - Rainbow)'s water?

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

How many people does Western Mwd (Id a - Rainbow) serve?

Western Mwd (Id a - Rainbow) reports serving 192 people in California, per its EPA record.

Has Western Mwd (Id a - Rainbow) had any water quality violations?

The EPA has no formal drinking-water violations on file for Western Mwd (Id a - Rainbow).

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.