Stillman Valley
EPA ID: IL1410550 · 1,200 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for Stillman Valley (IL1410550): no drinking-water violations recorded since 2021. EPA monitoring records reviewed for Stillman Valley list no violations. That describes the federal file only, not a test of the water at any tap, for a utility that reports serving approximately 1,200 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Stillman Valley Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Stillman Valley have a median household income of $93,264 and about 21,439 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 56% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Stillman Valley's water is classified in EPA records as a groundwater source. 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.
Wastewater Proximity Note: This service area ranks in the 80th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 60th 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 Illinois
System Overview
Stillman Valley (EPA ID: IL1410550) is a community water system in Illinois that serves approximately 1,200 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | No | 2025-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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 IL or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Stillman Valley (IL1410550) on EPA.gov.
Frequently Asked Questions
Is Stillman Valley water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Stillman Valley 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 Stillman Valley serve?
Stillman Valley serves approximately 1,200 people across 3 ZIP codes in Illinois.
Where does Stillman Valley get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Stillman Valley Water Quality Report, IL. https://zipcheckup.com/water-system/il1410550/
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title = {{Stillman Valley Water Quality Report, IL}},
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