Public water system record
City of St. Helena
Serves St. Helena, Napa County, CA · 5,386 people served
Federal records show 10 health-based violations and 1 monitoring/reporting issue for City of St. Helena in the last ten years. The most serious issue in this window was a Haloacetic Acids (HAA5) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 10
- Resolved
- 3
- Unresolved
- 0
- Archived by EPA
- 7
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- City of St. Helena draws water from 2 wells and 1 surface water intake.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 87.1 µg/L, federal limit 60 µg/L (1.5 times the limit), 2021.
- Most recent formal enforcement: compliance order (no penalty) by California, March 2021.
- Record on file since 1993, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 634 unknown out of 2,675 service lines.
Check whether City of St. Helena 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 |
|---|---|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 84.87 µg/L, federal limit 60 µg/L (1.4 times the limit)
|
220 | Jul 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 79.32 µg/L, federal limit 60 µg/L (1.3 times the limit)
|
220 | Apr 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 81 µg/L, federal limit 60 µg/L (1.4 times the limit)
|
220 | Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 87.1 µg/L, federal limit 60 µg/L (1.5 times the limit)
|
220 | Jan 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jan 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jan 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | Nov 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Oct 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Oct 1, 2016 | Resolved | 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
Monitoring and reporting
|
Oct 1, 2022 | Active |
Full record since 1993
EPA's records for City of St. Helena go back to 1993. Before October 19, 2016 they list 4 health-based violations (4 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 0 |
| 2010 to October 18, 2016 | 2 | 0 |
| October 19, 2016 to 2019 | 1 | 0 |
| 2020s | 8 | 1 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2016, Resolved.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Oct 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jul 1, 2016 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 1995 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1993 | Resolved |
Enforcement actions
California regulators took 4 formal enforcement actions against City of St. Helena between 1993 and 2021. The most recent was a compliance order (no penalty) in March 2021.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 23, 2021 | California | Compliance order (no penalty) | 7 violations (7 health-based): Haloacetic Acids (HAA5) |
| Dec 10, 2020 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Jan 19, 2017 | California | Compliance order (no penalty) | 3 violations (3 health-based): Haloacetic Acids (HAA5) |
| Mar 29, 1993 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
What the violations mean
Haloacetic Acids (HAA5)
9 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Surface Water Treatment Rule
1 incidentThe system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
City of St. Helena draws water from 2 wells and 1 surface water intake. It also buys water from City of Napa. 1 other community water system and 2 smaller public systems such as schools, businesses or campgrounds buy water from City of St. Helena. 3 other public water systems have emergency, seasonal or other part-time connections to City of St. Helena.
Buys water from
- City of Napa Napa, CA
Community systems that buy water from it
- City of Napa Napa, CA
Annual water quality report
City of St. Helena 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