Sonora Water Quality
California
According to EPA SDWIS, Sonora, California is served by 13 community water systems covering about 37,691 people. The same extract lists 3 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Sonora, California is delivered through 13 EPA-regulated community water systems serving an estimated 37,691 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 3 violation records across the 13 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Total Haloacetic Acids (HAA5), Coliform (TCR). 1 TRI-reporting industrial facility is 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 |
|---|---|---|---|
| TUD - UPPER BASIN WATER SYSTEM | 13,280 | 0 | Clean |
| TUD - SONORA/JAMESTOWN WATER SYSTEM | 11,054 | 0 | Clean |
| TUD - COLUMBIA WATER SYSTEM | 5,463 | 0 | Clean |
| TUD - PONDEROSA | 1,767 | 0 | Clean |
| TUD - TUOLUMNE WATER SYSTEM | 1,761 | 0 | Clean |
| PHOENIX LAKE ESTATES CC MWC | 1,168 | 0 | Clean |
| SONORA MEADOWS MUTUAL WTR CO | 1,123 | 2 | Health |
| TUD-APPLE VALLEY ESTATES | 826 | 0 | Clean |
| BELLEVIEW OAKS MUTUAL WATER CO | 468 | 0 | Clean |
| SLIDE INN SNOWBOWL WATER CO | 417 | 0 | Clean |
| GOLDEN SIERRA ESTATES_FKA MOTHER LODE | 210 | 0 | Clean |
| TUD-PEACEFUL PINES WATER SYSTEM | 92 | 0 | Clean |
| TUD-WARDS FERRY RANCHES | 62 | 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 |
|---|---|---|
| SONORA MEADOWS MUTUAL WTR CO | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SONORA MEADOWS MUTUAL WTR CO | Total Haloacetic Acids (HAA5) | 2015-01-01 |
| TUD-WARDS FERRY RANCHES | Coliform (TCR) | 2003-08-01 |
What are Sonora's health-based records for?
Sonora's health-based violation records carry 3 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) | 1 | 1 |
| Coliform (TCR) | 1 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Sonora
| Facility | Total Releases |
|---|---|
| Spi Sonora Div | 1 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Sonora, California? ▼
How many water violations does Sonora have in this EPA extract? ▼
What contaminants were found in Sonora water? ▼
How many water systems serve Sonora? ▼
Where does Sonora get its drinking water? ▼
Are there pollution sources near Sonora? ▼
How does Sonora compare in California?
Of the 909 California places with at least one community water system on file, Sonora ranks #31 by number of systems (13).
Either side of it: Oxnard (13), San Bernardino (13), Gilroy (12), Irvine (12)
About This Data
Figures here are the current EPA SDWIS extract joined to the 13 community water systems whose service area lists Sonora, 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.