South Auburn Water Association
EPA ID: WA5381400 · 212 people served · 3 ZIP codes
Zero violations in five consecutive years of EPA monitoring — South Auburn Water Association has held a clean track record across every reporting cycle in that span, with no enforcement activity of any kind on file for the full service population of 212 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for South Auburn Water Association Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The South Auburn Water Association serves a community with a median household income of $107,218 and an estimated 79,676 residents across its service area. Approximately 50% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
South Auburn Water Association's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 2% of homes in King County, Washington 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. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 12 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in Washington
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 Auburn Water Association (EPA ID: WA5381400) is a community water system in Washington that serves approximately 212 people from groundwater sources.
This system provides water to 3 ZIP codes across 2 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: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for South Auburn Water Association (WA5381400) on EPA.gov.
Frequently Asked Questions
Is South Auburn Water Association water safe to drink?
Based on EPA records, South Auburn Water Association has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does South Auburn Water Association serve?
South Auburn Water Association serves approximately 212 people across 3 ZIP codes in Washington.
Where does South Auburn Water Association get its water?
The primary water source is groundwater.