Thermal Water Quality
California
According to EPA SDWIS, Thermal, California is served by 17 community water systems covering about 2,291 people. The same extract lists 93 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 Thermal, California is delivered through 17 EPA-regulated community water systems serving an estimated 2,291 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 93 violation records across the 17 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 6 distinct EPA contaminant codes: Groundwater Rule, LEAD AND COPPER RULE REVISIONS, Arsenic, Revised Total Coliform Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule and 1 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 |
|---|---|---|---|
| Oasis Mobile Home Park | 826 | 43 | Health |
| Torres-Martinez Clinic | 379 | 3 | Health |
| DD Mobile Home Park | 275 | 27 | Health |
| AMEZCUA - GARCIA WATER | 170 | 7 | Health |
| Torres-Martinez Avenue 64 | 110 | 1 | Health |
| Montano Ranch | 72 | 4 | Health |
| Toledo MHP | 68 | 5 | Health |
| Ramon Zaragoza Water | 51 | 0 | Clean |
| Gamez MHP | 48 | 0 | Clean |
| El Mesquite MHP | 48 | 0 | Clean |
| Castro Ranch | 44 | 0 | Clean |
| Gonzalez MHP | 41 | 0 | Clean |
| Ranchos Los Ferro MHP | 41 | 0 | Clean |
| Sandoval MHP | 38 | 0 | Clean |
| Arellano MHP | 30 | 3 | Health |
| Barajas MHP | 25 | 0 | Clean |
| Garcia MHP | 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 |
|---|---|---|
| Toledo MHP | Groundwater Rule | 2025-11-30 |
| Toledo MHP | Groundwater Rule | 2025-08-19 |
| Toledo MHP | Groundwater Rule | 2025-08-19 |
| Toledo MHP | Groundwater Rule | 2025-08-19 |
| Toledo MHP | Groundwater Rule | 2025-08-19 |
| AMEZCUA - GARCIA WATER | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| DD Mobile Home Park | Groundwater Rule | 2024-06-20 |
| DD Mobile Home Park | Groundwater Rule | 2024-06-20 |
| DD Mobile Home Park | Groundwater Rule | 2024-06-20 |
| DD Mobile Home Park | Arsenic | 2024-04-01 |
| DD Mobile Home Park | Arsenic | 2024-04-01 |
| DD Mobile Home Park | Arsenic | 2024-04-01 |
| DD Mobile Home Park | Arsenic | 2024-04-01 |
| DD Mobile Home Park | Arsenic | 2023-10-01 |
| DD Mobile Home Park | Arsenic | 2023-10-01 |
| DD Mobile Home Park | Arsenic | 2023-10-01 |
| Arellano MHP | Revised Total Coliform Rule | 2023-08-01 |
| Arellano MHP | Revised Total Coliform Rule | 2023-08-01 |
| Arellano MHP | Revised Total Coliform Rule | 2023-08-01 |
| DD Mobile Home Park | Arsenic | 2023-07-01 |
| DD Mobile Home Park | Arsenic | 2023-07-01 |
| DD Mobile Home Park | Arsenic | 2023-07-01 |
| DD Mobile Home Park | Arsenic | 2023-07-01 |
| DD Mobile Home Park | Arsenic | 2023-07-01 |
| Montano Ranch | Revised Total Coliform Rule | 2022-11-01 |
| Montano Ranch | Revised Total Coliform Rule | 2022-11-01 |
| Montano Ranch | Revised Total Coliform Rule | 2022-11-01 |
| Montano Ranch | Revised Total Coliform Rule | 2022-11-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-10-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-10-01 |
| Oasis Mobile Home Park | Arsenic | 2022-10-01 |
| Oasis Mobile Home Park | Arsenic | 2022-10-01 |
| Oasis Mobile Home Park | Arsenic | 2022-10-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-07-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-07-01 |
| Oasis Mobile Home Park | Arsenic | 2022-07-01 |
| Oasis Mobile Home Park | Arsenic | 2022-07-01 |
| Oasis Mobile Home Park | Arsenic | 2022-07-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-04-01 |
| AMEZCUA - GARCIA WATER | Arsenic | 2022-04-01 |
| Oasis Mobile Home Park | Arsenic | 2022-04-01 |
| Oasis Mobile Home Park | Arsenic | 2022-04-01 |
| Oasis Mobile Home Park | Arsenic | 2022-04-01 |
| Oasis Mobile Home Park | Arsenic | 2022-04-01 |
| Oasis Mobile Home Park | Arsenic | 2022-01-01 |
| Oasis Mobile Home Park | Arsenic | 2022-01-01 |
| Oasis Mobile Home Park | Arsenic | 2022-01-01 |
| Oasis Mobile Home Park | Arsenic | 2021-10-01 |
| Oasis Mobile Home Park | Arsenic | 2021-10-01 |
| Oasis Mobile Home Park | Arsenic | 2021-10-01 |
What are Thermal's health-based records for?
Thermal's health-based violation records carry 6 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 |
|---|---|---|
| Arsenic | 58 | 4 |
| Groundwater Rule | 23 | 5 |
| Revised Total Coliform Rule | 7 | 2 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 2 | 1 |
| Fluoride | 2 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Thermal, California? ▼
How many water violations does Thermal have in this EPA extract? ▼
What contaminants were found in Thermal water? ▼
How many water systems serve Thermal? ▼
Where does Thermal get its drinking water? ▼
How does Thermal compare in California?
Of the 909 California places with at least one community water system on file, Thermal ranks #21 by number of systems (17).
Either side of it: Royal Oaks (17), Santa Barbara (17), Los Gatos (16), Modesto (16)
About This Data
Figures here are the current EPA SDWIS extract joined to the 17 community water systems whose service area lists Thermal, 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.