Illahee Oyehut
EPA ID: WA5335450 · 971 people served · 1 ZIP code
Compared to the national average for mid-size utilities, Illahee Oyehut sits well above the baseline — five years of EPA monitoring show no violations, no MCL exceedances, and no enforcement actions for the full service territory of 971 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Illahee Oyehut Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Illahee Oyehut serves a community with a median household income of $77,857 and an estimated 7,630 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 44% 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?
Illahee Oyehut'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 1% of homes in Grays Harbor County, Washington rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
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
Illahee Oyehut (EPA ID: WA5335450) is a community water system in Washington that serves approximately 971 people from groundwater sources.
This system serves ZIP code 98563 in Montesano.
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
- 98563 — Montesano
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Illahee Oyehut (WA5335450) on EPA.gov.
Frequently Asked Questions
Is Illahee Oyehut water safe to drink?
Based on EPA records, Illahee Oyehut has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Illahee Oyehut serve?
Illahee Oyehut serves approximately 971 people across 1 ZIP code in Washington.
Where does Illahee Oyehut get its water?
The primary water source is groundwater.