Three Rivers Water Quality
California
According to EPA SDWIS, Three Rivers, California is served by 12 community water systems covering about 10,513 people. The same extract lists 143 health-based violation records, most recently coded 1005 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Three Rivers, California is delivered through 12 EPA-regulated community water systems serving an estimated 10,513 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 143 violation records across the 12 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 7 distinct EPA contaminant codes: Arsenic, LEAD AND COPPER RULE REVISIONS, Total Haloacetic Acids (HAA5), TTHM, Revised Total Coliform Rule and 2 others.
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 |
|---|---|---|---|
| NPS-GRANT GROVE | 2,950 | 0 | Clean |
| NPS-WOLVERTON | 2,940 | 119 | Health |
| NPS-ASH MOUNTAIN | 2,930 | 0 | Clean |
| NORTH KAWEAH MUTUAL WATER COMPANY | 560 | 1 | Health |
| SOUTH KAWEAH MUTUAL WATER COMPANY | 384 | 18 | Health |
| SIERRA KING HOMEOWNERS ASSN | 260 | 0 | Clean |
| IMPROVEMENT DISTRICT NO. 1 | 200 | 1 | Health |
| SOUTH FORK ESTATES MUTUAL WATER CO | 106 | 0 | Clean |
| DEER MEADOW MUTUAL WATER COMPANY | 70 | 1 | Health |
| RIVER RETREAT MUTUAL WATER COMPANY | 40 | 0 | Clean |
| EAST THREE RIVERS MUTUAL WATER CORP | 40 | 2 | Health |
| VILLAGE APARTMENTS | 33 | 1 | Health |
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 |
|---|---|---|
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2025-10-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2025-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2025-04-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2025-01-01 |
| DEER MEADOW MUTUAL WATER COMPANY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| EAST THREE RIVERS MUTUAL WATER CORP | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2024-10-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2024-10-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2024-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2024-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2023-10-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2023-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2023-04-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-04-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-04-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2023-01-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-01-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2023-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2022-10-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2022-10-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2022-10-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2022-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2022-07-01 |
| SOUTH KAWEAH MUTUAL WATER COMPANY | Arsenic | 2022-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2022-04-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2021-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-10-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-04-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-04-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2020-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2018-04-01 |
| NPS-WOLVERTON | TTHM | 2018-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2018-01-01 |
| NPS-WOLVERTON | TTHM | 2017-10-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2017-10-01 |
| NPS-WOLVERTON | TTHM | 2017-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2017-07-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2017-04-01 |
| NPS-WOLVERTON | TTHM | 2017-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2017-01-01 |
| VILLAGE APARTMENTS | Revised Total Coliform Rule | 2017-01-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2016-10-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2016-07-01 |
| NPS-WOLVERTON | TTHM | 2016-04-01 |
| NPS-WOLVERTON | Total Haloacetic Acids (HAA5) | 2016-04-01 |
What are Three Rivers's health-based records for?
Three Rivers'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 |
|---|---|---|
| Total Haloacetic Acids (HAA5) | 70 | 1 |
| Tthm | 48 | 1 |
| Arsenic | 18 | 1 |
| Surface Water Treatment Rule | 3 | 3 |
| Lead and Copper Rule Revisions | 2 | 2 |
| Coliform (TCR) | 1 | 1 |
| Revised Total Coliform Rule | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Three Rivers, California? ▼
How many water violations does Three Rivers have in this EPA extract? ▼
What contaminants were found in Three Rivers water? ▼
How many water systems serve Three Rivers? ▼
Where does Three Rivers get its drinking water? ▼
How does Three Rivers compare in California?
Of the 909 California places with at least one community water system on file, Three Rivers ranks #36 by number of systems (12).
Either side of it: Rancho Cordova (12), Tehachapi (12), Vacaville (12), Visalia (12)
About This Data
Figures here are the current EPA SDWIS extract joined to the 12 community water systems whose service area lists Three Rivers, 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.