Willow Grove Mill
EPA ID: DE0020122 · 3,090 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Willow Grove Mill (DE0020122): no EPA violations recorded in the last five years. Federal monitoring spanning five full years has produced zero violations at Willow Grove Mill - a clean record across every reporting cycle for a utility serving approximately 3,090 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Willow Grove Mill Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Willow Grove Mill serves a community with a median household income of $129,971 and an estimated 65,199 residents across its service area. Approximately 40% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Willow Grove Mill'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 90th 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 Delaware
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
Willow Grove Mill (EPA ID: DE0020122) is a community water system in Delaware that serves approximately 3,090 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 DE 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 Willow Grove Mill (DE0020122) on EPA.gov.
Frequently Asked Questions
Is Willow Grove Mill water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Willow Grove Mill 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 Willow Grove Mill serve?
Willow Grove Mill serves approximately 3,090 people across 3 ZIP codes in Delaware.
Where does Willow Grove Mill get its water?
The primary water source is groundwater.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Willow Grove Mill Water Quality Report, DE. https://zipcheckup.com/water-system/de0020122/
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title = {{Willow Grove Mill Water Quality Report, DE}},
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