Public water system record
San Joaquin Estates Mutual Water Company
Serves an area of Kern County, CA · 165 people served
Federal records show 33 health-based violations and 7 monitoring/reporting issues for San Joaquin Estates Mutual Water Company in the last ten years. The most serious issue in this window was a Nitrate violation that EPA lists as archived, not resolved.
System profile
Source water
Groundwater
ZIP
93387
EPA system ID
CA1500575
- Health-based violations, last 10 years
- 33
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 33
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 7
Key facts
- San Joaquin Estates Mutual Water Company draws water from 1 well.
- Highest measured level in the last 10 years: Nitrate, 23 mg/L, federal limit 10 mg/L (2.3 times the limit), 2023.
- Most recent formal enforcement: compliance order (no penalty) by California, December 2024.
- Record on file since 1984, with 26 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 58 service lines.
Check whether San Joaquin Estates 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 |
|---|---|---|---|---|
|
Nitrate
Contaminant limit exceeded
Measured 21.5 mg/L, federal limit 10 mg/L (2.2 times the limit)
|
330 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 17 mg/L, federal limit 10 mg/L (1.7 times the limit)
|
330 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 20 mg/L, federal limit 10 mg/L (2 times the limit)
|
330 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jul 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Apr 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 18 mg/L, federal limit 10 mg/L (1.8 times the limit)
|
330 | Oct 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 23 mg/L, federal limit 10 mg/L (2.3 times the limit)
|
330 | Jul 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Apr 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Oct 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 20 mg/L, federal limit 10 mg/L (2 times the limit)
|
330 | Jul 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Apr 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 19 mg/L, federal limit 10 mg/L (1.9 times the limit)
|
330 | Jul 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Apr 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Jan 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Oct 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 16 mg/L, federal limit 10 mg/L (1.6 times the limit)
|
330 | Jul 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Apr 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Jan 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Oct 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Apr 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Jan 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Oct 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Jul 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Apr 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 15 mg/L, federal limit 10 mg/L (1.5 times the limit)
|
330 | Jan 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Oct 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Jul 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Apr 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Jan 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
330 | Oct 1, 2016 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
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, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2008 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2007 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2003 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 1997 | Resolved |
Full record since 1984
EPA's records for San Joaquin Estates Mutual Water Company go back to 1984. Before October 19, 2016 they list 26 health-based violations (5 resolved, 21 archived by EPA without a recorded fix) and 15 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 2 |
| 1990s | 5 | 3 |
| 2000s | 1 | 5 |
| 2010 to October 18, 2016 | 20 | 5 |
| October 19, 2016 to 2019 | 11 | 3 |
| 2020s | 21 | 0 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began October 2016, Archived.
Show all 26 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
Oct 1, 2016 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 14 mg/L, federal limit 10 mg/L (1.4 times the limit)
|
Jul 1, 2016 | Archived |
|
Nitrate-Nitrite (acute)
Contaminant limit exceeded
|
Apr 1, 2016 | Archived |
|
Nitrate-Nitrite (acute)
Contaminant limit exceeded
|
Jan 1, 2016 | Archived |
|
Nitrate-Nitrite (acute)
Contaminant limit exceeded
|
Oct 1, 2015 | Archived |
|
Nitrate-Nitrite (acute)
Contaminant limit exceeded
|
Jul 1, 2015 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2015 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2015 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2014 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2014 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2014 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2014 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2013 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2013 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2013 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2012 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2012 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2012 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jul 1, 2011 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 2011 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 9, 2000 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1999 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1998 | Resolved |
Enforcement actions
California regulators took 10 formal enforcement actions against San Joaquin Estates Mutual Water Company between 1999 and 2024. The most recent was a compliance order (no penalty) in December 2024.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 17, 2024 | California | Compliance order (no penalty) | 10 violations (10 health-based): Nitrate |
| Mar 4, 2020 | California | Compliance order (no penalty) | 2 violations: Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Dec 23, 2019 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| May 24, 2019 | California | Compliance order (no penalty) | 24 violations (24 health-based): Nitrate |
| Mar 2, 2012 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Mar 30, 2009 | California | Compliance order (no penalty) | 1 violation: Consumer Confidence Rule |
| Jun 10, 2008 | California | Compliance order (no penalty) | 1 violation: Consumer Confidence Rule |
| Dec 1, 2000 | California | Compliance order (no penalty) | 31 violations (29 health-based): Nitrate, Nitrate-Nitrite |
| Nov 2, 1999 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Jan 28, 1999 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
What the violations mean
Nitrate
33 incidentsNitrate exceeded the federal limit
High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome
Where the water comes from
San Joaquin Estates Mutual Water Company draws water from 1 well.
Annual water quality report
San Joaquin Estates 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 San Joaquin Estates 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