Water Quality: Arroyo Grande, CA
13 water systems • 23,710 people served
Multiple Health ViolationsWater Quality Summary
Arroyo Grande is served by 13 public water systems with a combined service population of 23,710 people, and has 152 EPA Safe Drinking Water Act violations on record. Critically, 102 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Arroyo Grande's violation count is 217% above the national average for California. Contaminants associated with violations include Arsenic, Barium, Selenium.
Contaminants Found
Long-term exposure increases risk of skin, bladder, and lung cancers, as well as cardiovascular and neurological effects.
Common source: Natural rock deposits, agricultural pesticides, industrial waste
EPA limit: 0.010 mg/L (10 ppb)
Increases blood pressure and causes cardiovascular effects with long-term exposure.
Common source: Natural rock deposits, oil drilling operations, coal power plant waste
EPA limit: 2 mg/L
Hair loss, nail brittleness, and nervous system damage at elevated concentrations.
Common source: Natural geological deposits, mining discharges, oil refinery waste
EPA limit: 0.05 mg/L (50 ppb)
Water Systems Serving Arroyo Grande
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| CITY OF ARROYO GRANDE UTILITIES DIVISION | CA4010001 | Surface Water | 17,963 | 2 |
| WOODLANDS DEVELOPMENT | CA4010081 | Groundwater | 3,862 | 1 |
| MESA DUNES MOBILE HOME ESTATES | CA4000650 | Groundwater | 600 | 5 |
| WOODLAND PARK MUTUAL WATER CO | CA4000506 | Groundwater | 538 | 39 |
| CANYON CREST MUTUAL BENEFIT WC | CA4000230 | Surface Water | 133 | 0 |
| EDNA VALLEY RANCH EAST | CA4000202 | Groundwater | 132 | 6 |
| VARIAN RANCH MUTUAL WATER | CA4000765 | Groundwater | 106 | 1 |
| KEN MAR GARDENS | CA4000648 | Groundwater | 84 | 39 |
| LAGUNA NEGRA MUTUAL WATER CO. | CA4000705 | Groundwater | 80 | 9 |
| H2O, INC | CA4000741 | Groundwater | 70 | 3 |
| COUNTRY HILLS ESTATES | CA4000637 | Groundwater | 60 | 45 |
| RANCHO NIPOMO WATER COMPANY | CA4000771 | Groundwater | 44 | 2 |
| TERRA DE ORO WATER COMPANY | CA4000749 | Groundwater | 38 | 0 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in California
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.