Wilmington Water Department

ZipCheckup's reading of EPA SDWIS for Wilmington Water Department (DE0000663): 1 EPA violation in the last five years. A total of 1 EPA violation spanning the past five monitoring years sit on Wilmington Water Department's record - every finding has been officially cleared, and the supplier now holds current compliance status for its service population of approximately 107,976 people, with no outstanding enforcement of any kind.

Data: EPA SDWIS

System Overview

Wilmington Water Department (EPA ID: DE0000663) is a community water system in Delaware that serves approximately 107,976 people from surface water sources.

This system provides water to 11 ZIP codes across 3 communities.

ZIP-Area Home Safety Context: C (68/100)

This is the average Home Safety Score for 8 of 11 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.

Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.

Violation History

Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for this water system:

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.

Radon Risk in Service Area

Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

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.

• 19720 - New Castle
• 19732 - Rockland
• 19801 - Wilmington
• 19802 - Wilmington
• 19803 - Wilmington
• 19804 - Wilmington
• 19805 - Wilmington
• 19806 - Wilmington
• 19807 - Wilmington
• 19809 - Wilmington
• 19810 - Wilmington

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Wilmington Water Department (DE0000663) on EPA.gov.

Frequently Asked Questions

Is Wilmington Water Department water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Wilmington Water Department; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does Wilmington Water Department serve?

Wilmington Water Department serves approximately 107,976 people across 11 ZIP codes in Delaware.

Where does Wilmington Water Department get its water?

The primary water source is surface water.

@misc{zipcheckup-water-system-de0000663,
  author = {{ZipCheckup}},
  title  = {{Wilmington Water Department (DE): 1 EPA Violation}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/de0000663/}
}