Porterville Water Quality
California
According to EPA SDWIS, Porterville, California is served by 11 community water systems covering about 68,122 people. The same extract lists 103 health-based violation records, most recently coded 0700 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Porterville, California is delivered through 11 EPA-regulated community water systems serving an estimated 68,122 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 103 violation records across the 11 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 7 distinct EPA contaminant codes: Groundwater Rule, LEAD AND COPPER RULE REVISIONS, Surface Water Treatment Rule, Revised Total Coliform Rule, Nitrate and 2 others. 3 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the California drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| PORTERVILLE, CITY OF | 63,487 | 1 | Health |
| Tule River Reservation Main | 2,560 | 29 | Health |
| PORTERVILLE DEVELOPMENTAL CENTER | 1,281 | 2 | Health |
| PORTERVILLE-JONES CORNER | 339 | 1 | Health |
| WILLIAMS MUTUAL WATER COMPANY | 165 | 1 | Health |
| LAKE SUCCESS MOBILE LODGE | 75 | 1 | Health |
| EAGLE'S NEST RESORT | 60 | 0 | Clean |
| PORTERVILLE - EAST PLANO | 46 | 2 | Health |
| SIERRA MUTUAL WATER COMPANY | 43 | 66 | Health |
| FOOTHILL APARTMENTS | 41 | 0 | Clean |
| Tule River Apple Valley | 25 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| Tule River Reservation Main | Groundwater Rule | 2025-11-19 |
| Tule River Reservation Main | Groundwater Rule | 2025-11-19 |
| Tule River Reservation Main | Groundwater Rule | 2025-11-19 |
| Tule River Reservation Main | Groundwater Rule | 2025-11-19 |
| Tule River Reservation Main | Groundwater Rule | 2025-09-19 |
| Tule River Reservation Main | Groundwater Rule | 2025-06-30 |
| Tule River Reservation Main | Groundwater Rule | 2025-06-30 |
| Tule River Reservation Main | Groundwater Rule | 2025-02-14 |
| Tule River Reservation Main | Groundwater Rule | 2025-02-14 |
| PORTERVILLE-JONES CORNER | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| PORTERVILLE, CITY OF | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| WILLIAMS MUTUAL WATER COMPANY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| LAKE SUCCESS MOBILE LODGE | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| Tule River Reservation Main | Surface Water Treatment Rule | 2023-02-01 |
| Tule River Reservation Main | Surface Water Treatment Rule | 2023-02-01 |
| Tule River Reservation Main | Surface Water Treatment Rule | 2023-02-01 |
| Tule River Reservation Main | Surface Water Treatment Rule | 2023-02-01 |
| Tule River Reservation Main | Surface Water Treatment Rule | 2023-02-01 |
| PORTERVILLE DEVELOPMENTAL CENTER | Revised Total Coliform Rule | 2021-08-01 |
| PORTERVILLE DEVELOPMENTAL CENTER | Revised Total Coliform Rule | 2021-08-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-07-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-07-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2021-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2020-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-07-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-07-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-04-01 |
| Tule River Reservation Main | Arsenic | 2019-04-01 |
| Tule River Reservation Main | Arsenic | 2019-04-01 |
| Tule River Reservation Main | Arsenic | 2019-04-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2019-01-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2018-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2018-10-01 |
| Tule River Reservation Main | Arsenic | 2018-10-01 |
| Tule River Reservation Main | Arsenic | 2018-10-01 |
| Tule River Reservation Main | Arsenic | 2018-10-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2018-07-01 |
| SIERRA MUTUAL WATER COMPANY | Nitrate | 2018-07-01 |
What are Porterville's health-based records for?
Porterville's health-based violation records carry 7 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Nitrate | 66 | 1 |
| Arsenic | 15 | 1 |
| Groundwater Rule | 9 | 1 |
| Surface Water Treatment Rule | 5 | 1 |
| Lead and Copper Rule Revisions | 4 | 4 |
| Coliform (TCR) | 2 | 1 |
| Revised Total Coliform Rule | 2 | 1 |
TRI Facilities in Porterville
| Facility | Total Releases |
|---|---|
| Foster Farms Porterville Plant | 2.8K lbs |
| Quikrete - Porterville Ca Plant | 0 lbs |
| Calportland Porterville Rmc | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Porterville, California? ▼
How many water violations does Porterville have in this EPA extract? ▼
What contaminants were found in Porterville water? ▼
How many water systems serve Porterville? ▼
Where does Porterville get its drinking water? ▼
Are there pollution sources near Porterville? ▼
How does Porterville compare in California?
Of the 909 California places with at least one community water system on file, Porterville ranks #44 by number of systems (11).
Either side of it: Morgan Hill (11), Paso Robles (11), West Covina (11), Alhambra (10)
About This Data
Figures here are the current EPA SDWIS extract joined to the 11 community water systems whose service area lists Porterville, ranked against the 909 California places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.