Water Quality: Los Gatos, CA
16 water systems • 3,587 people served
Multiple Health ViolationsWater Quality Summary
Los Gatos is served by 16 public water systems with a combined service population of 3,587 people, and has 218 EPA Safe Drinking Water Act violations on record. Critically, 125 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Los Gatos's violation count is 354% above the national average for California. Contaminants associated with violations include Contaminant 1011, E. coli, Fecal Coliform, Stage 2 DBP, Surface Water Treatment.
Contaminants Found
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)
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Water Systems Serving Los Gatos
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| COYOTE VALLEY RV RESORT | CA4300994 | Groundwater | 500 | 2 |
| SUMMIT WEST MUTUAL WATER CO. | CA4400617 | Surface Water | 481 | 15 |
| VILLA DEL MONTE MWC | CA4400595 | Surface Water | 419 | 0 |
| LAS CUMBRES MUTUAL WATER CO | CA4400631 | Surface Water | 402 | 111 |
| ALDERCROFT HEIGHTS COUNTY WATER DISTRICT | CA4300516 | Surface Water | 338 | 10 |
| LUPIN LODGE | CA4300716 | Surface Water | 300 | 7 |
| RIDGE MUTUAL WATER COMPANY | CA4400618 | Surface Water | 213 | 2 |
| MELODY WOODS WATER COMPANY | CA4300525 | Groundwater | 168 | 28 |
| LAKE CANYON MUTUAL WATER COMPANY | CA4300522 | Surface Water | 156 | 5 |
| SUMMIT MUTUAL WATER COMPANY | CA4400559 | Surface Water | 152 | 14 |
| RAINERI MUTUAL WATER COMPANY | CA4300520 | Surface Water | 145 | 4 |
| VISTA GRANDE WATER USERS ASSOCIATION | CA4300550 | Surface Water | 79 | 3 |
| BRUSH AND OLD WELL MUTUAL WATER COMPANY | CA4300978 | Surface Water | 70 | 2 |
| LAUREL COMMUNITY LEAGUE | CA4400528 | Surface Water | 64 | 4 |
| MIREVAL IMPROVEMENT ASSOCIATION | CA4300741 | Surface Water | 60 | 9 |
| MOUNTAIN SPRINGS MUTUAL WATER COMPANY | CA4300740 | Surface Water | 40 | 2 |
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.