Paso Robles Water Quality
California
According to EPA SDWIS, Paso Robles, California is served by 11 community water systems covering about 35,782 people. The same extract lists 138 health-based violation records, most recently coded 1045 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Paso Robles, California is delivered through 11 EPA-regulated community water systems serving an estimated 35,782 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 138 violation records across the 11 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 6 distinct EPA contaminant codes: Selenium, LEAD AND COPPER RULE REVISIONS, Arsenic, Total Haloacetic Acids (HAA5), Fluoride and 1 others. 5 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 |
|---|---|---|---|
| CITY OF PASO ROBLES WATER DIVISION | 31,176 | 0 | Clean |
| HERITAGE RANCH CSD | 2,956 | 57 | Health |
| WALNUT HILLS MUTUAL WATER CO | 486 | 0 | Clean |
| LOS ROBLES MOBILE HOME ESTATES | 420 | 0 | Clean |
| GREEN RIVER MUTUAL WATER CO. | 350 | 2 | Health |
| SNAKE RIVER RESORT | 150 | 0 | Clean |
| RESTHAVEN MOBILE HOME PARK | 99 | 33 | Health |
| RANCHO SALINAS MBWC | 50 | 0 | Clean |
| ALMIRA WATER ASSOCIATION | 40 | 37 | Health |
| MUSTANG SPRINGS MUTUAL WATER | 30 | 9 | Health |
| ADA'S LODGES | 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 |
|---|---|---|
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-10-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-07-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-04-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-04-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-01-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2025-01-01 |
| GREEN RIVER MUTUAL WATER CO. | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-10-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-10-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-07-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-07-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-04-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-04-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2024-04-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2024-04-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2024-01-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-01-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2024-01-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2024-01-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2024-01-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2024-01-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-10-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-10-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-10-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-10-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-10-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-10-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-10-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-10-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-10-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-07-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-07-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-07-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-07-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-07-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-07-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-07-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-07-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-07-01 |
| ALMIRA WATER ASSOCIATION | Arsenic | 2023-07-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-04-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-04-01 |
| HERITAGE RANCH CSD | Total Haloacetic Acids (HAA5) | 2023-04-01 |
| MUSTANG SPRINGS MUTUAL WATER | Fluoride | 2023-04-01 |
| MUSTANG SPRINGS MUTUAL WATER | Fluoride | 2023-04-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-04-01 |
| RESTHAVEN MOBILE HOME PARK | Selenium | 2023-04-01 |
What are Paso Robles's health-based records for?
Paso Robles'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 |
|---|---|---|
| Total Haloacetic Acids (HAA5) | 48 | 1 |
| Arsenic | 37 | 1 |
| Selenium | 34 | 2 |
| Fluoride | 9 | 1 |
| Tthm | 9 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Paso Robles
| Facility | Total Releases |
|---|---|
| Joslyn Sunbank Co LLC | 86.1K lbs |
| Coast Southwest Surfactants LLC | 43 lbs |
| Hanson Aggregates Mid-Pacific Inc | 0 lbs |
| Zurn Water LLC | 0 lbs |
| Firestone Walker LLC | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Paso Robles, California? ▼
How many water violations does Paso Robles have in this EPA extract? ▼
What contaminants were found in Paso Robles water? ▼
How many water systems serve Paso Robles? ▼
Where does Paso Robles get its drinking water? ▼
Are there pollution sources near Paso Robles? ▼
How does Paso Robles compare in California?
Of the 909 California places with at least one community water system on file, Paso Robles ranks #43 by number of systems (11).
Either side of it: Lucerne Valley (11), Morgan Hill (11), Porterville (11), West Covina (11)
About This Data
Figures here are the current EPA SDWIS extract joined to the 11 community water systems whose service area lists Paso Robles, 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.