Public water system record
NPS-Wolverton
Serves an area of Tulare County, CA · 2,940 people served
Federal records show 23 health-based violations and 4 monitoring/reporting issues for NPS-Wolverton in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.
System profile
Source water
Surface water
ZIP
93271
EPA system ID
CA5410503
- Health-based violations, last 10 years
- 23
- Resolved
- 23
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 4
Key facts
- NPS-Wolverton draws water from 1 well and 2 surface water intakes.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.135 mg/L, federal limit 0.06 mg/L (2.3 times the limit), 2022.
- Most recent formal enforcement: compliance order (no penalty) by California, July 2024.
- Record on file since 2000, with 86 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 125 unknown out of 125 service lines.
Check whether NPS-Wolverton 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 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Oct 1, 2023 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jul 1, 2023 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0692 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Apr 1, 2023 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.099 mg/L, federal limit 0.06 mg/L (1.7 times the limit)
|
220 | Jan 1, 2023 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Oct 1, 2022 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.128 mg/L, federal limit 0.06 mg/L (2.1 times the limit)
|
220 | Jul 1, 2022 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.135 mg/L, federal limit 0.06 mg/L (2.3 times the limit)
|
220 | Apr 1, 2022 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jul 1, 2021 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Oct 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 | Jul 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.066 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Apr 1, 2020 | 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 | Jan 1, 2020 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.116 mg/L, federal limit 0.06 mg/L (1.9 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.121 mg/L, federal limit 0.06 mg/L (2 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 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 REVISIONS
RPT
|
Jul 2, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
Full record since 2000
EPA's records for NPS-Wolverton go back to 2000. Before October 19, 2016 they list 86 health-based violations (86 resolved) and 3 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 38 | 3 |
| 2010 to October 18, 2016 | 48 | 0 |
| October 19, 2016 to 2019 | 10 | 1 |
| 2020s | 12 | 3 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2016, Resolved.
Show all 86 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
Oct 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.07 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jul 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
Apr 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Apr 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.06 mg/L (1.5 times the limit)
|
Jan 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
Oct 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Oct 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.06 mg/L (1.4 times the limit)
|
Jul 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.096 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jul 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.096 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
Apr 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.161 mg/L, federal limit 0.06 mg/L (2.7 times the limit)
|
Jan 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.113 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jan 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.153 mg/L, federal limit 0.06 mg/L (2.6 times the limit)
|
Oct 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.103 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Oct 1, 2014 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.152 mg/L, federal limit 0.06 mg/L (2.5 times the limit)
|
Jul 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.096 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jul 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2013 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.076 mg/L, federal limit 0.06 mg/L (1.3 times the limit)
|
Jul 1, 2013 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0988 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
Apr 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0838 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Apr 1, 2013 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.101 mg/L, federal limit 0.06 mg/L (1.7 times the limit)
|
Jan 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2013 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.104 mg/L, federal limit 0.06 mg/L (1.7 times the limit)
|
Oct 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Oct 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.11 mg/L, federal limit 0.06 mg/L (1.8 times the limit)
|
Jul 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.132 mg/L, federal limit 0.06 mg/L (2.2 times the limit)
|
Apr 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Apr 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.125 mg/L, federal limit 0.06 mg/L (2.1 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Jan 1, 2012 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1425 mg/L, federal limit 0.06 mg/L (2.4 times the limit)
|
Oct 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.108 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Oct 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.15 mg/L, federal limit 0.06 mg/L (2.5 times the limit)
|
Jul 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1148 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jul 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1293 mg/L, federal limit 0.06 mg/L (2.2 times the limit)
|
Apr 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1098 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Apr 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1243 mg/L, federal limit 0.06 mg/L (2.1 times the limit)
|
Jan 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1023 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Jan 1, 2011 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1075 mg/L, federal limit 0.06 mg/L (1.8 times the limit)
|
Oct 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0958 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.0982 mg/L, federal limit 0.06 mg/L (1.6 times the limit)
|
Jul 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0918 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1114 mg/L, federal limit 0.06 mg/L (1.9 times the limit)
|
Apr 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1073 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Apr 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1164 mg/L, federal limit 0.06 mg/L (1.9 times the limit)
|
Jan 1, 2010 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1228 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Jan 1, 2010 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.1486 mg/L, federal limit 0.06 mg/L (2.5 times the limit)
|
Oct 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1272 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Oct 1, 2009 | Resolved |
36 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
California regulators took 7 formal enforcement actions against NPS-Wolverton between 2007 and 2024. The most recent was a compliance order (no penalty) in July 2024.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 18, 2024 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Dec 14, 2022 | California | Compliance order (no penalty) | 1 violation: Consumer Confidence Rule |
| Sep 30, 2020 | California | Compliance order (no penalty) | 12 violations (12 health-based): Haloacetic Acids (HAA5) |
| Jan 23, 2019 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Feb 11, 2016 | California | Compliance order (no penalty) | 28 violations (28 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
| Aug 7, 2014 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Jan 24, 2007 | California | Compliance order (no penalty) | 69 violations (67 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
What the violations mean
Haloacetic Acids (HAA5)
19 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Total Trihalomethanes (TTHMs)
4 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
NPS-Wolverton draws water from 1 well and 2 surface water intakes. 1 other public water system has an emergency connection to NPS-Wolverton.
Annual water quality report
NPS-Wolverton 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