San Diego County Water Authority
EPA ID: CA3710042 · 0 people served · 105 ZIP codes
Federal monitoring records confirm San Diego County Water Authority has operated without any EPA violations for the full five-year window — covering every contaminant category and reporting cycle across a service area of approximately 0 residents, with no gaps in the compliance record.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 243 (2022) to 7 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for San Diego County Water Authority Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The San Diego County Water Authority serves a community with a median household income of $102,539 and an estimated 2,336,263 residents across its service area. Approximately 61% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
San Diego County Water Authority's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in San Diego County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 35 detections recorded. 8 exceed federal EPA limits (4 ppt for PFOA/PFOS). 4 exceed state limits.
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
San Diego County Water Authority (EPA ID: CA3710042) is a community water system in California that serves approximately 0 people from surface water sources.
This system provides water to 105 ZIP codes across 13 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 27 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 78 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 105 ZIP codes:
91902 · 91910 · 91911 · 91913 · 91914 91915 · 91935 · 91941 · 91945 · 91977 91978 · 92003 · 92008 · 92019 · 92020 92021 · 92028 · 92054 · 92056 · 92057 92058 · 92081 · 92083 · 92084 · 92101 92102 · 92103 · 92104 · 92105 · 92106 92107 · 92108 · 92109 · 92110 · 92111 92112 · 92113 · 92114 · 92115 · 92116 92117 · 92119 · 92120 · 92121 · 92122 92123 · 92124 · 92126 · 92127 · 92128 92129 · 92130 · 92131 · 92132 · 92133 92134 · 92135 · 92136 · 92137 · 92138 92139 · 92140 · 92142 · 92145 · 92147 92149 · 92150 · 92152 · 92153 · 92154 92155 · 92158 · 92159 · 92160 · 92161 92162 · 92163 · 92164 · 92165 · 92166 92167 · 92168 · 92169 · 92170 · 92171 92172 · 92174 · 92175 · 92176 · 92177 92179 · 92182 · 92184 · 92186 · 92187 92190 · 92191 · 92192 · 92193 · 92194 92195 · 92196 · 92197 · 92198 · 92199
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for San Diego County Water Authority (CA3710042) on EPA.gov.
Frequently Asked Questions
Is San Diego County Water Authority water safe to drink?
Based on EPA records, San Diego County Water Authority has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does San Diego County Water Authority serve?
San Diego County Water Authority serves approximately 0 people across 105 ZIP codes in California.
Where does San Diego County Water Authority get its water?
The primary water source is surface water.