Public water system record
Shamrock Mobile Home Park
Serves Windsor, Sonoma County, CA · 188 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for Shamrock Mobile Home Park 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
- 2
Key facts
- Shamrock Mobile Home Park draws water from 1 well.
- Most recent formal enforcement: compliance order (no penalty) by California, December 2025.
- Record on file since 1980, with 17 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 127 service lines.
Check whether Shamrock Mobile Home Park 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 |
|---|---|---|
|
Miscellaneous Other Rules
OTHER
|
Sep 24, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Lead and Copper Rule
Monitoring and reporting
|
Mar 26, 1997 | Resolved |
Full record since 1980
EPA's records for Shamrock Mobile Home Park go back to 1980. Before October 19, 2016 they list 17 health-based violations (17 resolved) and 17 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 5 |
| 1990s | 0 | 2 |
| 2000s | 5 | 8 |
| 2010 to October 18, 2016 | 12 | 2 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Arsenic, began October 2012, Resolved.
Show all 17 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.0101 mg/L, federal limit 0.01 mg/L (at or just above the limit)
|
Oct 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
Jul 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0108 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
Apr 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0123 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Jan 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Oct 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0128 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
Jul 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0133 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
Apr 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
Jan 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Oct 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Jul 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.015 mg/L, federal limit 0.01 mg/L (1.5 times the limit)
|
Apr 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.016 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
Jan 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01465 mg/L, federal limit 0.01 mg/L (1.5 times the limit)
|
Oct 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.021 mg/L, federal limit 0.01 mg/L (2.1 times the limit)
|
Jul 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.021 mg/L, federal limit 0.01 mg/L (2.1 times the limit)
|
Apr 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)
|
Jan 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.026 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
|
Oct 1, 2008 | Resolved |
Enforcement actions
California regulators took 7 formal enforcement actions against Shamrock Mobile Home Park between 2003 and 2025. The most recent was a compliance order (no penalty) in December 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 23, 2025 | California | Compliance order (no penalty) | 1 violation: Miscellaneous Other Rules |
| Mar 11, 2013 | California | Compliance order (no penalty) | 2 violations: Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| May 13, 2009 | California | Compliance order (no penalty) | 18 violations (17 health-based): Arsenic |
| Dec 15, 2008 | California | Compliance order (no penalty) | 1 violation: Arsenic |
| Dec 14, 2007 | California | Compliance order (no penalty) | 2 violations: Atrazine, Nitrite |
| Jun 13, 2007 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Jun 23, 2003 | California | Compliance order (no penalty) | 5 violations: Arsenic, Nitrate, 1,1,1-Trichloroethane, Atrazine, Lead and Copper Rule |
Where the water comes from
Shamrock Mobile Home Park draws water from 1 well.
Annual water quality report
Shamrock Mobile Home Park 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 Shamrock Mobile Home Park 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