Water Quality: Walnut Grove, CA
4 water systems • 308 people served
Multiple Health ViolationsWater Quality Summary
Walnut Grove is served by 4 public water systems with a combined service population of 308 people, and has 74 EPA Safe Drinking Water Act violations on record. Critically, 63 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Walnut Grove's violation count is 54% above the national average for California. Contaminants associated with violations include Barium, E. coli, Gross Alpha, TTHM.
Contaminants Found
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
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Alpha-emitting radioactive particles increase cancer risk, particularly from bone and other internal cancers.
Common source: Natural uranium and radium in geological formations
EPA limit: 15 pCi/L (excluding radon and uranium)
Total trihalomethanes are linked to increased risk of bladder cancer and adverse reproductive outcomes.
Common source: Reaction of chlorine disinfectants with naturally occurring organic matter in water
EPA limit: 0.080 mg/L (80 ppb)
Water Systems Serving Walnut Grove
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| SNUG HARBOR RV LP | CA4800561 | Groundwater | 125 | 50 |
| LOCKE WATER WORKS CO [SWS] | CA3400138 | Groundwater | 80 | 15 |
| RIVERSIDE MOBILE HOME PARK | CA3900762 | Groundwater | 55 | 9 |
| TUNNEL TRAILER PARK | CA3400192 | Groundwater | 48 | 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.