South San Joaquin Irrigation District
EPA ID: CA5010040 · 25 people served · 10 ZIP codes
Although compliance varies widely among water utilities nationally, South San Joaquin Irrigation District stands out with zero EPA violations over five consecutive monitoring years, delivering safe tap water to 25 residents and showing no enforcement activity across the entire reporting span.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2021) to 8 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for South San Joaquin Irrigation District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The South San Joaquin Irrigation District serves a community with a median household income of $88,997 and an estimated 293,871 residents across its service area. Approximately 49% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 55% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
South San Joaquin Irrigation District'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 Joaquin County, California rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 71th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 17 detections recorded. 10 exceed federal EPA limits (4 ppt for PFOA/PFOS). 5 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
South San Joaquin Irrigation District (EPA ID: CA5010040) is a community water system in California that serves approximately 25 people from surface water sources.
This system provides water to 10 ZIP codes across 8 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: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.
- 95206 — Stockton
- 95215 — Stockton
- 95230 — Farmington
- 95231 — French Camp
- 95320 — Escalon
- 95330 — Lathrop
- 95336 — Manteca
- 95337 — Manteca
- 95361 — Oakdale
- 95366 — Ripon
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for South San Joaquin Irrigation District (CA5010040) on EPA.gov.
Frequently Asked Questions
Is South San Joaquin Irrigation District water safe to drink?
Based on EPA records, South San Joaquin Irrigation District has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does South San Joaquin Irrigation District serve?
South San Joaquin Irrigation District serves approximately 25 people across 10 ZIP codes in California.
Where does South San Joaquin Irrigation District get its water?
The primary water source is surface water.