PWSID
DE0000221
State
Delaware
City
DOVER
Population served
51,000
Primary source
Groundwater
Score history
▼ 15 points — the score moved from 100 to 85 on Jun 18, 2026, as newly published EPA data was incorporated.
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 Oct 2025). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
5.1 ppt
limit 4 ppt
Violations & enforcement
5
Violations on record
0
Unaddressed
0
Health-based
9
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Apr 2013. Official EPA record →
Recent enforcement actions
- State action · SOX Apr 2013
- State action · SFJ Jan 2010
- State action · SIE Jan 2010
- EPA/federal action · EOX Jul 2002
- EPA/federal action · EOX Sep 1995
- State action · SOX Sep 1995
- State action · SFJ Jul 1995
- State action · SFJ Jul 1995
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.
Arsenic
1 station · latest May 2025
Lead
1 station · latest Sep 2024
Copper
1 station · latest Mar 2025
Nitrate
2 stations · latest Jun 2025
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 DE0000221 — 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.