PFAS in tap water, Allegheny County, Pennsylvania
3 of 26 water systems had PFAS-4 above our 0.5 ng/L benchmark at the latest sample. Highest: Moon TWP Muni Auth, 17 ng/L. 3 had PFOA or PFOS above the 4 ng/L federal MCL in at least one sample.
26 community water systems · 1,921,026 people served · newest sample December 9, 2025
Water systems in Allegheny County
| Water system | People served | PFAS-4 at the latest sample | Entry points | Latest sample |
|---|---|---|---|---|
| PA Amer Water CO-Pittsburgh | 686,000 | below the 3 to 4 ng/L reporting limit | 3 | October 24, 2024 |
| Pittsburgh Water & Sewer Auth | 520,000 | below the 3 to 4 ng/L reporting limit | 1 | October 30, 2024 |
| West View Water Authority | 200,000 | below the 3 to 4 ng/L reporting limit | 2 | June 4, 2025 |
| Wilkinsburg-Penn Jt Water Auth | 125,000 | below the 3 to 4 ng/L reporting limit | 2 | November 13, 2024 |
| Hampton Shaler Water Authority | 61,949 | below the 3 to 4 ng/L reporting limit | 2 | November 2, 2023 |
| Monroeville Municipal Auth | 48,500 | below the 3 to 4 ng/L reporting limit | 3 | October 30, 2024 |
| Oakmont Water Authority | 39,901 | below the 3 to 4 ng/L reporting limit | 1 | January 2, 2024 |
| Moon TWP Muni Auth | 38,000 | 17 ng/L above the 2029 federal MCL | 1 | July 23, 2025 |
| West Cnty Muni Auth-Mckeesport | 32,644 | below the 3 to 4 ng/L reporting limit | 1 | February 8, 2024 |
| Plum Boro Muni Auth | 27,500 | below the 3 to 4 ng/L reporting limit | 3 | December 6, 2023 |
| Western Allegheny County Mun A | 19,031 | 8.9 ng/L above the 2029 federal MCL | 4 | June 11, 2025 |
| Fox Chapel Auth | 18,500 | below the 3 to 4 ng/L reporting limit | 1 | October 29, 2024 |
| Robinson TWP Muni Auth | 16,354 | below the 3 to 4 ng/L reporting limit | 1 | July 22, 2024 |
| Harrison TWP Water Auth | 13,411 | below the 3 to 4 ng/L reporting limit | 1 | August 21, 2024 |
| Findlay TWP Municipal Auth | 11,460 | below the 3 to 4 ng/L reporting limit | 2 | April 9, 2025 |
| Richland TWP Water Authority | 10,190 | below the 3 to 4 ng/L reporting limit | 1 | March 27, 2025 |
| Edgeworth Boro Muni Auth | 7,781 | below the 3 to 4 ng/L reporting limit | 2 | December 11, 2023 |
| Sewickley Boro Water Auth | 6,800 | 3.2 ng/L | 1 | December 13, 2023 |
| Neville TWP Water Dept | 6,750 | below the 3 to 4 ng/L reporting limit | 1 | November 19, 2024 |
| Coraopolis Water & Sewer Auth | 5,804 | below the 3 to 4 ng/L reporting limit above the 2029 federal MCL in an earlier sample | 2 | December 12, 2023 |
| Duquesne Water Dept | 5,565 | below the 3 to 4 ng/L reporting limit | 1 | March 12, 2024 |
| Tarentum Boro Water Dept | 4,927 | below the 3 to 4 ng/L reporting limit | 1 | December 9, 2025 |
| Fawn Frazer Jt Water Auth | 4,650 | below the 3 to 4 ng/L reporting limit | 2 | October 10, 2023 |
| Brackenridge Boro Water Dept | 3,700 | below the 3 to 4 ng/L reporting limit | 1 | November 19, 2024 |
| Springdale Boro Water Dept | 3,405 | below the 3 to 4 ng/L reporting limit | 1 | September 24, 2024 |
| Reserve TWP Water Dept | 3,204 | below the 3 to 4 ng/L reporting limit | 1 | November 19, 2024 |
| Pittsburgh Intl Airport non-transient non-community water system | 26,915 | monitored under UCMR 5, no page | ||
| Upmc Presbyterian non-transient non-community water system | 8,200 | monitored under UCMR 5, no page | ||
| Va Pittsburgh UD non-transient non-community water system | 6,701 | monitored under UCMR 5, no page | ||
| Upmc Magee Womens Hospital non-transient non-community water system | 4,900 | monitored under UCMR 5, no page | ||
| Upmc Shadyside Hillman Campus non-transient non-community water system | 4,750 | monitored under UCMR 5, no page | ||
| Upmc Montefiore non-transient non-community water system | 4,500 | monitored under UCMR 5, no page | ||
6 systems without a page are not a community water system (schools, workplaces, campgrounds). Nobody's home tap water.
Not sure which one is yours? The systems report their own service areas to EPA. Check your water bill or your utility's Consumer Confidence Report.
ZIP codes in Allegheny County
Census ZIP code tabulation areas that overlap the county. A ZIP served by one system opens that system's page; a ZIP shared by several systems lists them.
- 15003
- 15005
- 15006
- 15007
- 15014
- 15015
- 15017
- 15018
- 15024
- 15025
- 15026
- 15034
- 15035
- 15037
- 15044
- 15045
- 15046
- 15051
- 15056
- 15057
- 15063
- 15065
- 15068
- 15071
- 15075
- 15076
- 15083
- 15084
- 15085
- 15086
- 15088
- 15089
- 15090
- 15101
- 15102
- 15104
- 15106
- 15108
- 15110
- 15112
- 15116
- 15120
- 15122
- 15123
- 15126
- 15129
- 15131
- 15132
- 15133
- 15136
- 15137
- 15139
- 15140
- 15143
- 15144
- 15145
- 15146
- 15147
- 15148
- 15201
- 15202
- 15203
- 15204
- 15205
- 15206
- 15207
- 15208
- 15209
- 15210
- 15211
- 15212
- 15213
- 15214
- 15215
- 15217
- 15218
- 15219
- 15220
- 15221
- 15222
- 15223
- 15224
- 15225
- 15228
- 15229
- 15232
- 15233
- 15234
- 15235
- 15236
- 15237
- 15238
- 15239
- 15241
- 15275
- 15321
- 15332
- 15642
- 15668
- 16046
- 16055
- 16059
How to read these numbers
We compare PFAS-4 (PFOA + PFOS + PFNA + PFHxS) with this site's 0.5 ng/L benchmark, the same line as on the European pages. UCMR 5 reporting limits are 3 to 4 ng/L. So any quantified PFAS-4 compound is above the benchmark, and a clean result reads "below the 3 to 4 ng/L reporting limit", never zero. The US legal limit is the 4 ng/L federal MCL for PFOA and PFOS, which systems must meet from April 26, 2029 ("above the 2029 federal MCL").
EPA: "UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards". Samples are taken where water enters the distribution system, not at your tap. A system may have changed sources or added treatment since. Source: U.S. Environmental Protection Agency (EPA), Office of Water, PFAS National Primary Drinking Water Regulation (NPDWR). Regulation details retrieved September 19, 2026. Every system page tracks the 2029 compliance date and the proposed rescission of the PFHxS, PFNA, HFPO-DA and Hazard Index limits.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.