Public water system record
Coastside County Water District
Serves Half Moon Bay and El Granada, San Mateo County, CA · 18,940 people served
Federal records show no health-based violations and no monitoring or reporting issues for Coastside County 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
- Coastside County Water District draws water from 8 wells and 4 surface water intakes (1 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: compliance order (no penalty) by California, June 2008.
- Record on file since 1992, with 6 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 7,710 service lines.
Check whether Coastside County 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 1992
EPA's records for Coastside County Water District go back to 1992. Before October 19, 2016 they list 6 health-based violations (6 resolved) and 8 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 4 |
| 2000s | 4 | 4 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began April 2008, Resolved.
Show all 6 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 1996 | Resolved |
Enforcement actions
California regulators took 1 formal enforcement action against Coastside County Water District in 2008. The most recent was a compliance order (no penalty) in June 2008.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jun 11, 2008 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
Where the water comes from
Coastside County Water District draws water from 8 wells and 4 surface water intakes (1 of them for emergency, seasonal or other part-time use).
Annual water quality report
Coastside County 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