Public water system record
Sonoma County Mutual Water Company
Serves an area of Sonoma County, CA · 40 people served
Federal records show 82 health-based violations and no monitoring/reporting issues for Sonoma County Mutual Water Company in the last ten years. The most serious issue in this window was a resolved Surface Water Treatment Rule violation.
System profile
Source water
Groundwater under direct influence
ZIP
94117
EPA system ID
CA4900640
- Health-based violations, last 10 years
- 82
- Resolved
- 82
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- Sonoma County Mutual Water Company draws water from 1 well.
- Most recent formal enforcement: compliance order with a penalty by California, July 2020.
- Record on file since 1980, with 49 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 18 service lines.
Check whether Sonoma County 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 |
|---|---|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 23, 2020 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2019 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2018 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2017 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 10, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2016 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2015 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2014 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Sep 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Aug 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jul 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jun 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Apr 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Feb 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Jan 1, 2013 | Resolved | No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Dec 1, 2011 | Resolved | No |
Full record since 1980
EPA's records for Sonoma County Mutual Water Company go back to 1980. Before October 19, 2016 they list 49 health-based violations (49 resolved) and 37 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 32 |
| 1990s | 1 | 3 |
| 2000s | 0 | 1 |
| 2010 to October 18, 2016 | 48 | 1 |
| October 19, 2016 to 2019 | 34 | 0 |
| 2020s | 1 | 0 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began October 2016, Resolved.
Show all 49 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 10, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2015 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2011 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 1995 | Resolved |
Enforcement actions
California regulators took 3 formal enforcement actions against Sonoma County Mutual Water Company between 2006 and 2020. The most recent was a compliance order with a penalty in July 2020.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 23, 2020 | California | Compliance order with a penalty | 1 violation (1 health-based): Surface Water Treatment Rule |
| Feb 3, 2012 | California | Compliance order (no penalty) | 82 violations (82 health-based): Surface Water Treatment Rule |
| Jan 23, 2006 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
What the violations mean
Surface Water Treatment Rule
82 incidentsThe system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Sonoma County Mutual Water Company draws water from 1 well.
Annual water quality report
Sonoma County 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 County 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