Public water system record
Sonoma Mountain County Water District
Serves an area of Sonoma County, CA · 181 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Sonoma Mountain 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
- 1
Key facts
- Sonoma Mountain County Water District draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: compliance order (no penalty) by California, October 2021.
- Record on file since 1980, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 56 service lines.
Check whether Sonoma Mountain 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.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Full record since 1980
EPA's records for Sonoma Mountain County Water District go back to 1980. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 5 |
| 1990s | 0 | 3 |
| 2000s | 0 | 2 |
| 2010 to October 18, 2016 | 1 | 1 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began January 2011, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2011 | Resolved |
Enforcement actions
California regulators took 5 formal enforcement actions against Sonoma Mountain County Water District between 2007 and 2021. The most recent was a compliance order (no penalty) in October 2021.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 29, 2021 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Oct 2, 2015 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Mar 3, 2011 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| May 1, 2009 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Jun 13, 2007 | California | Compliance order (no penalty) | 1 violation: Nitrate |
Where the water comes from
Sonoma Mountain County Water District draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
Annual water quality report
Sonoma Mountain 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 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Sonoma Mountain County Water District for a copy.
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