Public water system record
City of Mountain House
Serves Mountain House, San Joaquin County, CA · 24,948 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Mountain House 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
- 0
Key facts
- City of Mountain House draws water from 1 surface water intake.
- Most recent formal enforcement: compliance order (no penalty) by California, March 2010.
- Record on file since 2005, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 7,446 service lines.
Check whether City of Mountain House 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, and no monitoring or reporting violations either.
Full record since 2005
EPA's records for City of Mountain House go back to 2005. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 1 monitoring or reporting violation.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 1 | 0 |
| 2010 to October 18, 2016 | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began January 2005, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2005 | Resolved |
Enforcement actions
California regulators took 1 formal enforcement action against City of Mountain House in 2010. The most recent was a compliance order (no penalty) in March 2010.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 9, 2010 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
Where the water comes from
City of Mountain House draws water from 1 surface water intake.
Annual water quality report
City of Mountain House 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 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
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