Willow Grove Mill
EPA ID: DE0020122 · 3,090 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for Willow Grove Mill (DE0020122): no drinking-water violations recorded since 2021. Checked against the EPA violation database, Willow Grove Mill returns no entries for its service territory of 3,090 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Willow Grove Mill Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Willow Grove Mill have a median household income of $129,971 and about 65,199 residents live in those ZIP codes (Census; not the number of people this system supplies). 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 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.
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
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 |
|---|---|---|
| Below the reporting limit | No | 2023-06-30 |
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 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 available EPA compliance records 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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