Stillman Valley
EPA ID: IL1410550 · 1,200 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Stillman Valley (IL1410550): no EPA violations recorded in the last five years. Throughout five consecutive years of federal water monitoring, Stillman Valley recorded zero violations - solid performance for a utility serving 1,200 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Stillman Valley Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Stillman Valley serves a community with a median household income of $93,264 and an estimated 21,439 residents across its service area. 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 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.
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
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
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 |
|---|---|---|
| 0 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.
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 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 the full compliance record 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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