No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting October 2022.
Serves about 133,000 people (120,175 connections) with surface water from its own intake, and buys water from PA American Water Co-Pittsburgh.
From EPA's record for PA5260036. PurityMap is independent of Mawc Yough Plant.
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2 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2022 | Haloacetic acids (HAA5) | 0.065 mg/L | 0.060 mg/L | Resolved |
| From August 2022 | Surface Water Treatment Rule | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from September 2024 to June 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-09-10 to 2025-03-11 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-09-10 to 2025-06-24 | UCMR5 Analytical Results: MAWC YOUGH PLANT (PA5260036) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Mawc Yough Plant's phone number on EPA record is 724-626-0050. Its mailing address is PO BOX 730, GREENSBURG, PA 15601.
According to EPA's record, Mawc Yough Plant uses surface water from its own intake, and buys water from PA American Water Co-Pittsburgh.
EPA's record shows 2 health-based violations for Mawc Yough Plant in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting October 2022. EPA also lists 10 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Mawc Yough Plant's latest lead and copper round, which ended in September 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Mawc Yough Plant. Its phone number on EPA record is 724-626-0050. Its mailing address on EPA record is PO BOX 730, GREENSBURG, PA 15601. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.