Public water system record
Western MWD
Serves Lake Mathews, March ARB, Woodcrest and 3 more places, Riverside County, CA · 86,062 people served
Federal records show no health-based violations and no monitoring or reporting issues for Western MWD in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- Western MWD buys its water from Eastern Municipal WD, Metropolitan Water Dist. of So. Cal., City of Riverside, Chino Basin Desalter Auth. - Desalter 2 and Western MWD (Arlington).
- Lead pipe inventory: 0 lead and 0 unknown out of 23,306 service lines.
Check whether Western MWD serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Where the water comes from
Western MWD buys its water from Eastern Municipal WD, Metropolitan Water Dist. of So. Cal., City of Riverside, Chino Basin Desalter Auth. - Desalter 2 and Western MWD (Arlington). It lists no wells or intakes of its own. 5 other community water systems buy water from Western MWD. 3 other public water systems have emergency connections to Western MWD.
Buys water from
- Eastern Municipal WD Perris, CA
- Metropolitan Water Dist. of So. Cal. La Verne, CA
- City of Riverside Riverside, CA
- Chino Basin Desalter Auth. - Desalter 2 Ontario, CA
- Western MWD (Arlington) Riverside, CA
Community systems that buy water from it
- Box Springs Mutual WC Moreno Valley, CA
- Elsinore Valley MWD Lake Elsinore, CA
- Rancho California Water District Temecula, CA
- Temescal Valley Water District Temescal Valley, CA
- Western MWD (Arlington) Riverside, CA
Annual water quality report
Western MWD must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.
Certified drinking water labs by state EPA guidance for private wells