Public water system · DE0020122
ActiveWillow Grove Mill
At a glance
Willow Grove Mill (PWSID DE0020122) is an active community water system in New Castle County, Delaware. It reports serving 3,090 people through 1,026 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,090
Service connections
1,026
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Willow Grove Mill compare with other water systems in New Castle County?
By EPA's size categories, Willow Grove Mill is a small system (501 to 3,300 people). New Castle County has 76 active public water systems. Its population served is about 57% below the county average of 7,119 people per system, and accounts for 0.6% of the 541,043 people reported by systems filed under the county. Across Delaware, the 494 active systems average 2,238 people each. Nationally, the average active community water system reports serving 6,703 people, so Willow Grove Mill is about half of that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Delaware has 219 active community water systems, 44% of the state's 494 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 25 Delaware systems (5.1%) list purchased groundwater as their primary source.
Who owns and regulates Willow Grove Mill?
EPA lists Willow Grove Mill as owned by a local government. The DE state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 12 of the 76 active systems in New Castle County (16%) are also owned by a local government.
Does Willow Grove Mill have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Willow Grove Mill. For the latest compliance status, check EPA ECHO for current compliance history.
Willow Grove Mill: frequently asked questions
Who runs Willow Grove Mill?
Willow Grove Mill (PWSID DE0020122) is a community water system owned by a local government. It is regulated by the DE state drinking water program.
How many people does Willow Grove Mill serve?
Willow Grove Mill reports serving 3,090 people through 1,026 service connections in New Castle County, Delaware.
Where does Willow Grove Mill get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Willow Grove Mill have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Willow Grove Mill's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the DE state drinking water program.
Where can I find Willow Grove Mill's water quality report?
As a community water system, Willow Grove Mill must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in New Castle County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Artesian Water Company | New Castle | 231,114 | Community | Purchased surface water |
| Wilmington Water Department | New Castle | 107,976 | Community | Surface water |
| Veolia Water Delaware, Inc. | New Castle | 100,495 | Community | Surface water |
| Newark Water Department | New Castle | 40,000 | Community | Surface water |
| Middletown Water Department | New Castle | 17,700 | Community | Purchased surface water |
| Municipal Services Commission | New Castle | 5,549 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Willow Grove Mill, PWSID DE0020122, Delaware”, https://aquacensus.com/water-systems/delaware/willow-grove-mill-de0020122 (data as of October 1, 2026).