EPA system PA5260036 · Pennsylvania

Mawc Yough Plant: No PFAS or lithium found in EPA testing

System ID PA5260036; community water system; Pennsylvania; source: surface water; serves 133,000 people via 120,175 connections; status: active

In focus133,000people served, EPA registry

Public records. Clearer context.

Mawc Yough Plant is a local-government-owned community water system in Pennsylvania serving about 133,000 people, matched to 46 ZIP codes.

PFAS treatment declared to EPA: None declared (3 of 3 sampling events) · PFAS found before UCMR 5: Yes, at 3 of 4 sampling events

PFAS and lithium: what EPA's national survey found

EPA tested this water for 30 substances and found none of them at levels its laboratories can measure.

Between September 2024 and June 2025, EPA's UCMR 5 program tested 90 samples from 1 sampling location for 30 contaminants (29 PFAS plus lithium). None were found above their minimum reporting levels.

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 3 of 4 sampling events, no at 1 of 4 sampling events; potential PFAS sources nearby: not known at 4 of 4 sampling events; PFAS treatment in place: no PFAS treatment at 3 of 3 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. The action level has been reached in 1 of the 13 periods on record.

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; 1 of the 13 monitoring periods on record reached 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 12 violations since Sep 3, 2016. 2 are health-based, meaning a contaminant or treatment rule was not met. The other 10 concern missed monitoring, reporting or public notices.

EPA's SDWIS database lists 12 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), 9 for monitoring or reporting, 1 other (public notification or consumer confidence report requirements).

Sanitary surveys and site visits

Most recent state inspection: Jun 15, 2023 (sanitary survey); 1 visit 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, 297.5 sq mi