Little Potato Slough Mutual
EPA ID: CA3910022 · 1,510 people served · 3 ZIP codes
With a five-year violation-free history, Little Potato Slough Mutual delivers safe water to 1,510 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 68% chance of violation in next 12 months
Violations went from 3 (2021) to 4 (2023). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Little Potato Slough Mutual Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Little Potato Slough Mutual serves a community with a median household income of $88,290 and an estimated 78,542 residents across its service area. Approximately 65% 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?
Little Potato Slough Mutual'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 70th 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. 14 detections recorded. 4 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 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
Little Potato Slough Mutual (EPA ID: CA3910022) is a community water system in California that serves approximately 1,510 people from surface water sources.
This system provides water to 3 ZIP codes across 1 community.
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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Little Potato Slough Mutual (CA3910022) on EPA.gov.
Frequently Asked Questions
Is Little Potato Slough Mutual water safe to drink?
Based on EPA records, Little Potato Slough Mutual has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Little Potato Slough Mutual serve?
Little Potato Slough Mutual serves approximately 1,510 people across 3 ZIP codes in California.
Where does Little Potato Slough Mutual get its water?
The primary water source is surface water.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.