Public water system record
Sonora Meadows Mutual Wtr Co
Serves Mono Vista, Tuolumne County, CA · 1,123 people served
Federal records show 1 health-based violation and 3 monitoring/reporting issues for Sonora Meadows Mutual Wtr Co 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
- 3
Key facts
- Sonora Meadows Mutual Wtr Co draws water from 3 wells.
- Most recent formal enforcement: compliance order with a penalty by California, March 2022.
- Record on file since 1993, with 1 health-based violation before October 19, 2016.
Check whether Sonora Meadows Mutual Wtr Co 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 |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2025 | Resolved |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Active |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
Full record since 1993
EPA's records for Sonora Meadows Mutual Wtr Co go back to 1993. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 4 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 2 |
| 2000s | 0 | 2 |
| 2010 to October 18, 2016 | 1 | 0 |
| 2020s | 1 | 3 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began January 2015, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jan 1, 2015 | Resolved |
Enforcement actions
California regulators took 3 formal enforcement actions against Sonora Meadows Mutual Wtr Co between 2004 and 2022. The most recent was a compliance order with a penalty in March 2022.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 25, 2022 | California | Compliance order with a penalty | 1 violation: Nitrate |
| Aug 4, 2015 | California | Compliance order (no penalty) | 1 violation (1 health-based): Haloacetic Acids (HAA5) |
| Jul 8, 2004 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
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
Sonora Meadows Mutual Wtr Co draws water from 3 wells. It also buys water from Tud - Upper Basin Water System.
Buys water from
- Tud - Upper Basin Water System Sonora, CA
Annual water quality report
Sonora Meadows Mutual Wtr Co 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.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
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