Allegheny County Water Quality: 5 Cities Ranked by the Records
Allegheny County, Pennsylvania: 5 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 2 systems of 5 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest19.6 µg/L
- PA AMER WATER CO-PITTSBURGH19.6 µg/LSample date: 2024-01-08 to 2024-10-24
- OAKMONT WATER AUTHORITY11 µg/LSample date: 2023-04-26 to 2024-01-02
- MONROEVILLE MUNICIPAL AUTHNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-01-17 to 2024-10-30
- PITTSBURGH WATER & SEWER AUTHNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-02-13 to 2024-10-30
- WEST CNTY MUNI AUTH-MCKEESPORTNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-05-09 to 2024-02-08
Lead (90th percentile)Detected in 4 systems of 5 tested15 µg/L federal action level · US EPAHighest4 µg/L
- PA AMER WATER CO-PITTSBURGH4 µg/LMonitoring period: 2025–2025
- PITTSBURGH WATER & SEWER AUTH2 µg/LMonitoring period: 2025–2025
- MONROEVILLE MUNICIPAL AUTH1.5 µg/LMonitoring period: 2025–2025
- OAKMONT WATER AUTHORITY0.46 µg/LMonitoring period: 2025–2025
- WEST CNTY MUNI AUTH-MCKEESPORTNot detectedMonitoring period: 2025–2025
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)Detected in 1 system of 5 testedNo federal or state limit; shown for transparencyHighest11 ng/L
- MONROEVILLE MUNICIPAL AUTH11 ng/LSample date: 2024-01-17 to 2024-10-30
- OAKMONT WATER AUTHORITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-04-26 to 2024-01-02
- PA AMER WATER CO-PITTSBURGHNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-01-08 to 2024-10-24
- PITTSBURGH WATER & SEWER AUTHNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-13 to 2024-10-30
- WEST CNTY MUNI AUTH-MCKEESPORTNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-05-09 to 2024-02-08
28 PFAS tested, none detected in any systemShow
Tested in these 5 systems: MONROEVILLE MUNICIPAL AUTH, OAKMONT WATER AUTHORITY, PA AMER WATER CO-PITTSBURGH, PITTSBURGH WATER & SEWER AUTH, WEST CNTY MUNI AUTH-MCKEESPORT
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 5 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in PennsylvaniaLargest water systems
- Bethel ParkPA AMER WATER CO-PITTSBURGH · PA5020039686,000 served
- PittsburghPITTSBURGH WATER & SEWER AUTH · PA5020038520,000 served
- MonroevilleMONROEVILLE MUNICIPAL AUTH · PA502002748,500 served
- OakmontOAKMONT WATER AUTHORITY · PA502003639,901 served
- McKeesportWEST CNTY MUNI AUTH-MCKEESPORT · PA502002532,644 served
Frequently asked
How does Allegheny County tap water compare across cities?
PurityMap ranks 5 cities in Allegheny County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Oakmont's main water system: OAKMONT WATER AUTHORITY · PWSID PA5020036 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Allegheny County cities had a PFAS sample above a 2024 EPA limit?
None of the 5 Allegheny County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.
Is there lead in Allegheny County tap water?
Utilities report lead as a 90th-percentile result from home taps. 4 of 5 Allegheny County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
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