City of Winlock
EPA ID: WA5397500 · 3,502 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for City of Winlock (WA5397500): no EPA violations recorded in the last five years. With a five-year violation-free history, City of Winlock delivers safe water to 3,502 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for City of Winlock Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The City of Winlock serves a community with a median household income of $75,750 and an estimated 7,276 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.
Environmental Justice Note: 40% 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?
City of Winlock'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.
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
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
City of Winlock (EPA ID: WA5397500) is a community water system in Washington that serves approximately 3,502 people from groundwater sources.
This system serves ZIP code 98596 in Winlock.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0024 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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 WA or modeled from parcel and building-footprint data.
- 98596 - Winlock
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Winlock (WA5397500) on EPA.gov.
Frequently Asked Questions
Is City of Winlock water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for City of Winlock in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does City of Winlock serve?
City of Winlock serves approximately 3,502 people across 1 ZIP code in Washington.
Where does City of Winlock get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). City of Winlock Water Quality Report, WA. https://zipcheckup.com/water-system/wa5397500/
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title = {{City of Winlock Water Quality Report, WA}},
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url = {https://zipcheckup.com/water-system/wa5397500/}
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