PWSID
PA7220017
State
Pennsylvania
City
HUMMELSTOWN
Population served
50,200
Primary source
Surface water
Score history
▼ 10 points — the score moved from 100 to 90 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 2024). Levels in parts per trillion (ppt).
PFOA
Perfluorooctanoic acid
4.3 ppt
limit 4 ppt
Lithium
11,400 ppt
limit —
PFBA
6.7 ppt
limit —
PFPeA
5.2 ppt
limit —
PFHxA
4.1 ppt
limit —
PFBS
3.3 ppt
limit —
Violations & enforcement
5
Violations on record
0
Unaddressed
1
Health-based
12
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Oct 2018. Official EPA record →
Recent enforcement actions
- State action · SOX Oct 2018
- State action · SIA Oct 2018
- EPA/federal action · EOX Sep 2012
- State action · SIA Aug 2011
- State action · SOX Aug 2011
- EPA/federal action · EFL Apr 2010
- State action · SOX Sep 1994
- State action · SIC Sep 1994
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.
Manganese
1 station · latest Oct 2024
Copper
1 station · latest Oct 2024
Lead
1 station · latest Aug 2024
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 PA7220017 — 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.