Public water system record
GSWC-San Dimas
Serves San Dimas, Covina, Charter Oak and 1 more place, Los Angeles County, CA · 56,538 people served
Federal records show no health-based violations and no monitoring or reporting issues for GSWC-San Dimas 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
- GSWC-San Dimas draws water from 6 wells.
- Record on file since 1995, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 16,303 service lines.
Check whether GSWC-San Dimas 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.
Full record since 1995
EPA's records for GSWC-San Dimas go back to 1995. Before October 19, 2016 they list 2 health-based violations (2 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 0 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began September 1997, Resolved.
Show all 2 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 1997 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 1, 1995 | Resolved |
Where the water comes from
GSWC-San Dimas draws water from 6 wells. It also buys water from Covina Irrigating Co., Three Valleys MWD and Walnut Valley Water District.
Buys water from
- Covina Irrigating Co. West Covina, CA
- Three Valleys MWD Claremont, CA
- Walnut Valley Water District Walnut, CA
Annual water quality report
GSWC-San Dimas 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