No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting June 2021.
Serves about 3,856 people (1,600 connections) with surface water bought from North Fayette Cnty Muni Auth.
From EPA's record for PA5260032. PurityMap is independent of Mountain Water Assn.
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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 |
|---|---|---|---|---|
| From July 2021 | E. coli | – | – | Resolved |
| From June 2021 | E. coli | – | – | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2023 to December 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 10.5 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| 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 | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-03-22 to 2023-12-12 | UCMR5 Analytical Results: MOUNTAIN WATER ASSN (PA5260032) |
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 →Mountain Water Assn's phone number on EPA record is 724-564-7510. Its mailing address is PO BOX 527, FAIRCHANCE, PA 15436.
According to EPA's record, Mountain Water Assn uses surface water bought from North Fayette Cnty Muni Auth.
EPA's record shows 2 health-based violations for Mountain Water Assn 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 June 2021. EPA also lists 47 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Mountain Water Assn's latest lead and copper round, which ended in September 2025, was 1.79 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Mountain Water Assn. Its phone number on EPA record is 724-564-7510. Its mailing address on EPA record is PO BOX 527, FAIRCHANCE, PA 15436. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.