Public water system record
Westborough Water District
Serves South San Francisco, San Mateo County, CA · 13,486 people served
Federal records show no health-based violations and no monitoring or reporting issues for Westborough Water District 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
- Westborough Water District buys its water from San Francisco Regional Water System and North Coast County Water Dist.
- Record on file since 1991, with 2 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 3,886 service lines.
Check whether Westborough Water District 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 1991
EPA's records for Westborough Water District go back to 1991. 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: Total Coliform, began July 1998, Resolved.
Show all 2 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1998 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 1991 | Resolved |
Where the water comes from
Westborough Water District buys its water from San Francisco Regional Water System and North Coast County Water Dist. It lists no wells or intakes of its own. It also has an emergency connection to City of Daly City. 2 other public water systems have emergency connections to Westborough Water District.
Buys water from
- San Francisco Regional Water System Burlingame, CA
- North Coast County Water Dist Pacifica, CA
Emergency or part-time connections to
- City of Daly City Daly City, CA
Annual water quality report
Westborough Water District 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