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Water system · PWSID DE0000663

WILMINGTON WATER DEPARTMENT

WILMINGTON, DE · ~107,976 people served

Check your exact address → WILMINGTON overview
86
Excellent
PurityRadar safety score

PWSID

DE0000663

State

Delaware

City

WILMINGTON

Population served

107,976

Primary source

Surface water

Score history

▼ 14 points — the score moved from 100 to 86 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 86

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jan 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFBA

14 ppt

limit —

No federal limit

PFHpA

8.4 ppt

limit —

No federal limit

PFHxA

4.1 ppt

limit —

No federal limit

PFPeA

3.8 ppt

limit —

No federal limit

PFBS

3.6 ppt

limit —

No federal limit

Violations & enforcement

12

Violations on record

0

Unaddressed

4

Health-based

24

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2023. Official EPA record →

Monitoring · Lead & Copper Rule began Aug 2023 Resolved
Treatment technique · EPA contaminant 0800 health-based began Oct 2017 Resolved
Other · EPA contaminant 7000 began Jul 2015 Resolved
Monitoring & reporting · EPA contaminant 0800 began May 2015 Resolved
Monitoring & reporting · EPA contaminant 3015 began May 2015 Resolved
Monitoring & reporting · EPA contaminant 0800 began Apr 2015 Resolved
Monitoring & reporting · EPA contaminant 3015 began Apr 2015 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2013 Resolved
Treatment technique · EPA contaminant 0200 health-based began May 2004 Resolved
Treatment technique · EPA contaminant 0200 health-based began Oct 2003 Resolved
Other · EPA contaminant 7000 began Jul 2002 Resolved
Monitoring & reporting · Total coliform began Dec 2001 Resolved

Recent enforcement actions

  • State action · SOX Oct 2023
  • State action · SFJ Sep 2023
  • State action · SIE Sep 2023
  • EPA/federal action · EFL Nov 2017
  • EPA/federal action · EOX Nov 2017
  • EPA/federal action · EOX Sep 2015
  • EPA/federal action · EIA Aug 2015
  • State action · SOX Jul 2015

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Copper

2 stations · latest Jul 2025

1.4 · max 9.1 ug/L · 134

Lead

2 stations · latest Jul 2025

0.091 · max 1.8 ug/L · 104

Arsenic

1 station · latest Jul 2025

0.325 · max 2.3 ug/L · 42

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system DE0000663 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.