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Counties → Pennsylvania

Allegheny County, Pennsylvania

SDWIS compliance plate

Sheet PA003 · Allegheny County 69 sys · 5,241 viol · #19/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-SW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 89.9% flagged
  • HEALTH-LOW 12.5% health
  • RANK-TOP #19/3254
  • PHOTO-FINISH ±0.8 pp
  • PFAS-MID 28.1% detect
  • SRC-SW SW lead 74%
  • SYS-MID 69 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Lawrence County (+ 0.8 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Allegheny County ranks #19 of 3,254 counties by people served, and #1 of 68 counties in Pennsylvania. See methodology · corpus placement.

Allegheny County standing, lower-flagged corpus third

Flagged-system rate 89.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.5% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 28.1% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #19 of 3,254 · #1 of 68 in Pennsylvania.

Flagged-rate neighbourhood around Allegheny County

Lowest/highest poles plus in-state counties nearest Allegheny County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Greene · lowest Lawrence · near Butler · near Sullivan · highest 66.7% 89.9% 90.6% 90.9% 91.8% 92.9% 100%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

Water Systems

System Name Population Violations PFAS
PA Amer Water Co-Pittsburgh 686,000 28 Clean
Pittsburgh Water & Sewer Auth 520,000 193 Clean
West View Water Authority 200,000 290 Clean
Wilkinsburg-Penn Jt Water Auth 125,000 155 Clean
Hampton Shaler Water Authority 61,949 74 Clean
Monroeville Municipal Auth 48,500 45 Detected
Oakmont Water Authority 39,901 26 Clean
Moon Twp Muni Auth 38,000 168 Detected
West Cnty Muni Auth-McKeesport 32,644 110 Clean
Plum Boro Muni Auth 27,500 50 Clean
Pittsburgh Intl Airport 26,915 43 Detected
Western Allegheny County Mun A 19,031 101 Detected
Fox Chapel Auth 18,500 21 Clean
Robinson Twp Muni Auth 16,354 199 Clean
Harrison Twp Water Auth 13,411 133 Clean
Findlay Twp Municipal Auth 11,460 128 Clean
Richland Twp Water Authority 10,190 16 Clean
Upmc Presbyterian 8,200 47 Clean
Edgeworth Boro Muni Auth 7,781 23 Clean
Sewickley Boro Water Auth 6,800 214 Detected
Neville Twp Water Dept 6,750 34 Clean
VA Pittsburgh Ud 6,701 10 Clean
Coraopolis Water & Sewer Auth 5,804 97 Detected
Duquesne Water Dept 5,565 136 Clean
Tarentum Boro Water Dept 4,927 152 Clean
Upmc Magee Womens Hospital 4,900 37 Detected
Upmc Shadyside Hillman Campus 4,750 52 Clean
Fawn Frazer Jt Water Auth 4,650 72 Detected
Upmc Montefiore 4,500 36 Clean
Brackenridge Boro Water Dept 3,700 137 Clean
Springdale Boro Water Dept 3,405 249 Detected
Reserve Twp Water Dept 3,204 48 Clean
Harmar Twp Muni Auth 3,200 368 -
Aspinwall Boro Water Dept 3,151 47 -
VA Healthcare System Heinz 3,112 11 -
Upmc Western Psychiatric Inst 2,645 49 -
Allegheny General Hospital 2,595 0 -
Jefferson Hospital 2,470 0 -
Blawnox Boro Water Dept 2,200 176 -
Aleppo Twp Auth 2,200 56 -
East Deer Twp Water Dept 2,000 110 -
Cheswick Boro Water Dept 1,861 119 -
Braddock Boro Water Auth 1,708 65 -
Township of Springdale 1,600 88 -
Oakdale Boro Water Dept 1,459 119 -
Ahn Wexford Hospital 1,072 0 -
Allegheny Valley Hospital 908 0 -
Davids Diner 900 71 -
Virginia Hills PA LLC 843 0 -
Heritage Valley Sewickley 750 0 -

Compare beyond Pennsylvania

Lower-flagged peers for Allegheny County

Cross-state counties nearest Allegheny County on flagged-system share (89.9%) and cumulative violation count (5,241). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.