Public water system record
City of Napa
Serves an area of Napa County, CA that includes Napa, Silverado Resort, Oakville and 1 more place · 84,804 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Napa 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 Napa draws water from 3 surface water intakes.
- Most recent formal enforcement: compliance order (no penalty) by California, February 2015.
- Record on file since 1988, with 7 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 3,387 unknown out of 29,573 service lines.
Check whether City of Napa 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 1988
EPA's records for City of Napa go back to 1988. Before October 19, 2016 they list 7 health-based violations (7 resolved) and 2 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 2 |
| 1990s | 1 | 0 |
| 2010 to October 18, 2016 | 6 | 0 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began January 2016, Resolved.
Show all 7 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0957 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0815 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Jul 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jul 1, 2013 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 1995 | Resolved |
Enforcement actions
California regulators took 2 formal enforcement actions against City of Napa between 2013 and 2015. The most recent was a compliance order (no penalty) in February 2015.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Feb 27, 2015 | California | Compliance order (no penalty) | 5 violations (5 health-based): Total Trihalomethanes (TTHMs) |
| Aug 28, 2013 | California | Compliance order (no penalty) | 1 violation (1 health-based): Haloacetic Acids (HAA5) |
Where the water comes from
City of Napa draws water from 3 surface water intakes. It also buys water from City of Calistoga and City of St. Helena. It also has emergency connections to City of American Canyon and Town of Yountville. 3 other community water systems buy water from City of Napa.
Buys water from
- City of Calistoga Calistoga, CA
- City of St. Helena St. Helena, CA
Emergency or part-time connections to
- City of American Canyon American Canyon, CA
- Town of Yountville Yountville, CA
Community systems that buy water from it
- City of Calistoga Calistoga, CA
- City of St. Helena St. Helena, CA
- Town of Yountville Yountville, CA
Annual water quality report
City of Napa 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