Public water system record
Sierra Twain Harte MHP
Serves an area of Tuolumne County, CA · 129 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Sierra Twain Harte MHP 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
- 1
Key facts
- Sierra Twain Harte MHP draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
- Most recent enforcement action: boil water order by California, October 1999.
- Record on file since 1980, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 46 service lines.
Check whether Sierra Twain Harte MHP 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 |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2025 | Resolved |
Full record since 1980
EPA's records for Sierra Twain Harte MHP go back to 1980. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 6 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 4 |
| 1990s | 1 | 1 |
| 2010 to October 18, 2016 | 0 | 1 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform (acute), began October 1999, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 1999 | Resolved |
Enforcement actions
California regulators issued 1 boil water order to Sierra Twain Harte MHP in 1999. The most recent was a boil water order in October 1999.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 7, 1999 | California | Boil water order | 1 violation (1 health-based): Total Coliform |
Where the water comes from
Sierra Twain Harte MHP draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
Annual water quality report
Sierra Twain Harte MHP 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 Sierra Twain Harte MHP 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