Arroyo Grande Water Quality
California
According to EPA SDWIS, Arroyo Grande, California is served by 13 community water systems covering about 23,709 people. The same extract lists 107 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 Arroyo Grande, California is delivered through 13 EPA-regulated community water systems serving an estimated 23,709 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 107 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: Selenium, Nitrate, Arsenic. 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 |
|---|---|---|---|
| CITY OF ARROYO GRANDE UTILITIES DIVISION | 17,963 | 0 | Clean |
| WOODLANDS DEVELOPMENT | 3,862 | 0 | Clean |
| MESA DUNES MOBILE HOME ESTATES | 600 | 0 | Clean |
| WOODLAND PARK MUTUAL WATER CO | 538 | 29 | Health |
| CANYON CREST MUTUAL BENEFIT WC | 133 | 0 | Clean |
| EDNA VALLEY RANCH EAST | 132 | 0 | Clean |
| VARIAN RANCH MUTUAL WATER | 105 | 0 | Clean |
| KEN MAR GARDENS | 84 | 36 | Health |
| LAGUNA NEGRA MUTUAL WATER CO. | 80 | 0 | Clean |
| H2O, INC | 70 | 0 | Clean |
| COUNTRY HILLS ESTATES | 60 | 42 | Health |
| RANCHO NIPOMO WATER COMPANY | 44 | 0 | Clean |
| TERRA DE ORO WATER COMPANY | 38 | 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 |
|---|---|---|
| KEN MAR GARDENS | Selenium | 2025-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-10-01 |
| KEN MAR GARDENS | Selenium | 2025-07-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-07-01 |
| KEN MAR GARDENS | Selenium | 2025-04-01 |
| KEN MAR GARDENS | Selenium | 2025-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-04-01 |
| KEN MAR GARDENS | Selenium | 2025-01-01 |
| KEN MAR GARDENS | Selenium | 2025-01-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-01-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2025-01-01 |
| KEN MAR GARDENS | Selenium | 2024-10-01 |
| KEN MAR GARDENS | Selenium | 2024-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-10-01 |
| KEN MAR GARDENS | Selenium | 2024-07-01 |
| KEN MAR GARDENS | Selenium | 2024-07-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-07-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-07-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-07-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-07-01 |
| KEN MAR GARDENS | Selenium | 2024-04-01 |
| KEN MAR GARDENS | Selenium | 2024-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-04-01 |
| KEN MAR GARDENS | Selenium | 2024-01-01 |
| KEN MAR GARDENS | Selenium | 2024-01-01 |
| KEN MAR GARDENS | Nitrate | 2024-01-01 |
| KEN MAR GARDENS | Nitrate | 2024-01-01 |
| KEN MAR GARDENS | Nitrate | 2024-01-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-01-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-01-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2024-01-01 |
| KEN MAR GARDENS | Selenium | 2023-10-01 |
| KEN MAR GARDENS | Selenium | 2023-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-10-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-10-01 |
| KEN MAR GARDENS | Selenium | 2023-07-01 |
| KEN MAR GARDENS | Selenium | 2023-07-01 |
| KEN MAR GARDENS | Selenium | 2023-04-01 |
| KEN MAR GARDENS | Selenium | 2023-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-04-01 |
| WOODLAND PARK MUTUAL WATER CO | Nitrate | 2023-04-01 |
What are Arroyo Grande's health-based records for?
Arroyo Grande'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.
TRI Facilities in Arroyo Grande
| Facility | Total Releases |
|---|---|
| Phillips 66 Co-Santa Maria Refinery | 39.2K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Arroyo Grande, California? ▼
How many water violations does Arroyo Grande have in this EPA extract? ▼
What contaminants were found in Arroyo Grande water? ▼
How many water systems serve Arroyo Grande? ▼
Where does Arroyo Grande get its drinking water? ▼
Are there pollution sources near Arroyo Grande? ▼
How does Arroyo Grande compare in California?
Of the 909 California places with at least one community water system on file, Arroyo Grande ranks #28 by number of systems (13).
Either side of it: San Diego (15), Watsonville (15), Oxnard (13), San Bernardino (13)
About This Data
Figures here are the current EPA SDWIS extract joined to the 13 community water systems whose service area lists Arroyo Grande, 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.