Indian Ridge Water Association
EPA ID: WA5335639 · 216 people served · 1 ZIP code
Five years of EPA monitoring have produced no violations for Indian Ridge Water Association — the supplier serving 216 residents has kept every contaminant level within federal limits, a result that places it among the top-performing utilities for systems with a service population of comparable size.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Indian Ridge Water Association Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Indian Ridge Water Association serves a community with a median household income of $144,733 and an estimated 37,868 residents across its service area.
💧 Where Does Your Water Come From?
Indian Ridge 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. 6 detections recorded. 1 exceeds 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
Indian Ridge Water Association (EPA ID: WA5335639) is a community water system in Washington that serves approximately 216 people from groundwater sources.
This system serves ZIP code 98038 in Maple Valley.
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
- 98038 — Maple Valley
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Indian Ridge Water Association (WA5335639) on EPA.gov.
Frequently Asked Questions
Is Indian Ridge Water Association water safe to drink?
Based on EPA records, Indian Ridge Water Association has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Indian Ridge Water Association serve?
Indian Ridge Water Association serves approximately 216 people across 1 ZIP code in Washington.
Where does Indian Ridge Water Association get its water?
The primary water source is groundwater.