Public water system record
Mariposa Pines Mutual
Serves an area of Mariposa County, CA · 284 people served
Federal records show 1 health-based violation and 4 monitoring/reporting issues for Mariposa Pines Mutual 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
- 4
Key facts
- Mariposa Pines Mutual draws water from 2 wells.
- Most recent formal enforcement: compliance order with a penalty by California, February 2025.
- Record on file since 1996, with 3 health-based violations before October 19, 2016.
Check whether Mariposa Pines Mutual 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 |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2020 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
Full record since 1996
EPA's records for Mariposa Pines Mutual go back to 1996. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 4 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 0 | 1 |
| 2010 to October 18, 2016 | 3 | 2 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 1 | 3 |
Most recent health-based violation before October 19, 2016: Total Coliform, began October 2015, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2013 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2012 | Resolved |
Enforcement actions
California regulators took 6 formal enforcement actions against Mariposa Pines Mutual between 2012 and 2025. The most recent was a compliance order with a penalty in February 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Feb 25, 2025 | California | Compliance order with a penalty | 1 violation: Consumer Confidence Rule |
| Feb 16, 2021 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Mar 27, 2018 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Feb 3, 2016 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Feb 4, 2013 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Jun 18, 2012 | 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
Mariposa Pines Mutual draws water from 2 wells.
Annual water quality report
Mariposa Pines Mutual 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 Mariposa Pines Mutual 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