Public water system record
Sonoma Ranch Mutual Water Company
Serves an area of Sonoma County, CA · 151 people served
Federal records show 1 health-based violation and 1 monitoring/reporting issue for Sonoma Ranch Mutual Water Company in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 0
- Unresolved
- 1
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Sonoma Ranch Mutual Water Company draws water from 4 wells.
- Most recent formal enforcement: compliance order (no penalty) by California, October 2007.
- Record on file since 1980, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 53 service lines.
Check whether Sonoma Ranch Mutual Water Company 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.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Active | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Active |
Full record since 1980
EPA's records for Sonoma Ranch Mutual Water Company go back to 1980. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 4 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 4 |
| 2000s | 1 | 0 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform (acute), began August 2007, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform (acute)
Contaminant limit exceeded
|
Aug 1, 2007 | Resolved |
Enforcement actions
California regulators took 1 formal enforcement action against Sonoma Ranch Mutual Water Company in 2007. The most recent was a compliance order (no penalty) in October 2007.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 1, 2007 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
What the violations mean
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Sonoma Ranch Mutual Water Company draws water from 4 wells.
Annual water quality report
Sonoma Ranch Mutual Water Company 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 Ranch Mutual Water Company 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