EPA system PA1460073 · Pennsylvania

Aqua Pa Main System: PFOA at or above EPA's 4.0 ppt limit

System ID PA1460073; community water system; Pennsylvania; source: surface water; serves 822,600 people via 304,127 connections; status: active

In focus822,600people served, EPA registry

Public records. Clearer context.

Aqua Pa Main System is a privately owned community water system in Pennsylvania serving about 822,600 people, matched to 94 ZIP codes.

PFAS treatment declared to EPA: Ion exchange (2 of 51 sampling events), granular activated carbon (2 of 51 sampling events) · PFAS found before UCMR 5: Yes, at 50 of 50 sampling events

PFAS and lithium: what EPA's national survey found

EPA tested this water for 30 substances and found 10. PFOA averaged 11.8 ppt where EPA's limit is 4.0 ppt, and PFOS averaged 8.9 ppt where EPA's limit is 4.0 ppt. EPA's limit applies to a running yearly average and is enforced from 2029. That PFOA result is higher than 99% of the 10,307 water systems EPA tested for it. Lithium reached 15.7 ppb; EPA's health reference level, which is guidance and not a limit, is 10 ppb.

Between February 2024 and December 2024, EPA's UCMR 5 program tested 1,500 samples from 19 sampling locations for 30 contaminants (29 PFAS plus lithium). 10 were detected above the reporting level in at least one sample. Averaged over a complete monitoring set, the highest sampling location for PFOA was 11.8 ppt, at or above the MCL of 4.0 ppt that applies from 2029 (highest single sample 12.6 ppt). Averaged over a complete monitoring set, the highest sampling location for PFOS was 8.9 ppt, at or above the MCL of 4.0 ppt that applies from 2029 (highest single sample 9.2 ppt). Lithium reached 15.7 ppb in a single sample, at or above the health reference level of 10 ppb, which is non-regulatory.

Sampling-point average: mean of a location's two (ground water) or four (surface water) UCMR 5 results with non-detects counted as zero, EPA's method for comparing UCMR 5 data to the PFAS MCLs. EPA rounds to the reference value's significant digits before deciding whether an average is "greater than" an MCL (PFOA/PFOS averages count as above 4.0 ng/L only from 4.05 ng/L; lithium results count as above the 10 ppb reference only from 15 ppb). This site does not apply that rounding: "at or above" here means the measured value is numerically at or above the reference.

Utility-reported context (UCMR 5 questionnaire, aggregated across sampling events): PFAS previously found at this system: yes at 50 of 50 sampling events; potential PFAS sources nearby: yes at 50 of 50 sampling events; PFAS treatment in place: no PFAS treatment at 47 of 51 sampling events, ion exchange at 2 of 51 sampling events, granular activated carbon at 2 of 51 sampling events.

Lead at customer taps

In the latest completed monitoring period, ending Sep 30, 2025, 9 in 10 sampled homes had lead at or below 0 ppb, below the 15 ppb action level that triggers utility action. None of the 14 periods on record reached it.

In the most recent completed lead monitoring period, ending Sep 30, 2025, the 90th-percentile lead result at customer taps was 0 ppb, below the action level of 15 ppb (14 monitoring periods on record, none at the action level). The 90th percentile is the value that 9 in 10 sampled homes were at or below. Values are in parts per billion (ppb).

Drinking water violations since Sep 3, 2016

EPA lists 46 violations since Sep 3, 2016. 2 are health-based, meaning a contaminant or treatment rule was not met. The other 44 concern missed monitoring, reporting or public notices.

EPA's SDWIS database lists 46 violations recorded since Sep 3, 2016: 2 health-based (a contaminant above its maximum contaminant level, a disinfectant above its maximum residual level, or a required treatment technique not met), 43 for monitoring or reporting, 1 other (public notification or consumer confidence report requirements).

Sanitary surveys and site visits

Most recent state inspection: Mar 14, 2025 (sanitary survey); 2 visits since Sep 3, 2021.

What you can do about these results

ZIP codes served

Sources

Data vintage: EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.

• EPA ECHO detailed facility report
• EPA UCMR 5 Data Finder
• EPA service-area boundary: modeled, 251.8 sq mi