Public water system record
San Miguel WS #01
Serves Prunedale, Monterey County, CA · 100 people served
Federal records show 15 health-based violations and 1 monitoring/reporting issue for San Miguel WS #01 in the last ten years, including an unresolved Revised Total Coliform Rule violation.
System profile
- Health-based violations, last 10 years
- 15
- Resolved
- 14
- Unresolved
- 1
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 1
Key facts
- San Miguel WS #01 draws water from 3 wells (2 of them for emergency, seasonal or other part-time use).
- Highest measured level in the last 10 years: Nitrate, 27 mg/L, federal limit 10 mg/L (2.7 times the limit), 2020.
- Most recent formal enforcement: compliance order (no penalty) by California, December 2025.
- Record on file since 1980, with 48 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 35 service lines.
Check whether San Miguel WS #01 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 |
|---|---|---|---|---|
|
Revised Total Coliform Rule
Treatment technique failure
|
110 | Nov 18, 2025 |
Active
Enforcement action in place
|
No |
|
Nitrate
Contaminant limit exceeded
Measured 27 mg/L, federal limit 10 mg/L (2.7 times the limit)
|
330 | Jan 1, 2020 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 27 mg/L, federal limit 10 mg/L (2.7 times the limit)
|
330 | Oct 1, 2019 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 27 mg/L, federal limit 10 mg/L (2.7 times the limit)
|
330 | Jul 1, 2019 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 26 mg/L, federal limit 10 mg/L (2.6 times the limit)
|
330 | Apr 1, 2019 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 26 mg/L, federal limit 10 mg/L (2.6 times the limit)
|
330 | Jan 1, 2019 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 26 mg/L, federal limit 10 mg/L (2.6 times the limit)
|
330 | Oct 1, 2018 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 26 mg/L, federal limit 10 mg/L (2.6 times the limit)
|
330 | Jul 1, 2018 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 24 mg/L, federal limit 10 mg/L (2.4 times the limit)
|
330 | Apr 1, 2018 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 24 mg/L, federal limit 10 mg/L (2.4 times the limit)
|
330 | Jan 1, 2018 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 23 mg/L, federal limit 10 mg/L (2.3 times the limit)
|
330 | Oct 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 23 mg/L, federal limit 10 mg/L (2.3 times the limit)
|
330 | Jul 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
|
330 | Apr 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
|
330 | Jan 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 20 mg/L, federal limit 10 mg/L (2 times the limit)
|
330 | Oct 1, 2016 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2021 |
Active
Enforcement action in place
|
Full record since 1980
EPA's records for San Miguel WS #01 go back to 1980. Before October 19, 2016 they list 48 health-based violations (48 resolved) and 15 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 2 |
| 1990s | 1 | 3 |
| 2000s | 19 | 9 |
| 2010 to October 18, 2016 | 28 | 1 |
| October 19, 2016 to 2019 | 12 | 0 |
| 2020s | 2 | 1 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began October 2016, Resolved.
Show all 48 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
Measured 20 mg/L, federal limit 10 mg/L (2 times the limit)
|
Oct 1, 2016 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 20 mg/L, federal limit 10 mg/L (2 times the limit)
|
Jul 1, 2016 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 16 mg/L, federal limit 10 mg/L (1.6 times the limit)
|
Apr 1, 2016 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 16 mg/L, federal limit 10 mg/L (1.6 times the limit)
|
Jan 1, 2016 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 16 mg/L, federal limit 10 mg/L (1.6 times the limit)
|
Oct 1, 2015 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 18 mg/L, federal limit 10 mg/L (1.8 times the limit)
|
Jul 1, 2015 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2015 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2015 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2014 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2014 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2014 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2013 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2013 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2013 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2013 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2012 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2012 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2012 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2012 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 1, 2011 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 2011 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2011 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2011 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Feb 1, 2011 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 2010 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 2010 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
May 1, 2010 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Feb 1, 2010 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 2009 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 2009 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2009 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 2007 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 1, 2007 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
May 1, 2007 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
May 1, 2007 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2006 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 1, 2006 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2006 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2006 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1997 | Resolved |
Enforcement actions
California regulators took 4 formal enforcement actions against San Miguel WS #01 and issued 1 boil water order between 2006 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 (1 health-based): Revised Total Coliform Rule |
| Jan 24, 2025 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Nov 8, 2006 | California | Compliance order (no penalty) | 18 violations (18 health-based): Nitrate |
| Mar 1, 2006 | California | Compliance order (no penalty) | 55 violations (48 health-based): Nitrate |
| Jan 27, 2006 | California | Boil water order | 1 violation |
What the violations mean
Nitrate
14 incidentsNitrate exceeded the federal limit
High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Where the water comes from
San Miguel WS #01 draws water from 3 wells (2 of them for emergency, seasonal or other part-time use).
Annual water quality report
San Miguel WS #01 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 San Miguel WS #01 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