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Counties → Pennsylvania

Mercer County, Pennsylvania

SDWIS compliance plate

Sheet PA085 · Mercer County 146 sys · 18,095 viol · #585/3254

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

  • VIOL-SEVERE 95.2% flagged
  • HEALTH-LOW 7.7% health
  • RANK-TOP #585/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-MID 40.0% detect
  • SRC-GW GW lead 97%
  • SYS-LARGE 146 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Adams County ( -0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Mercer County ranks #585 of 3,254 counties by people served, and #28 of 68 counties in Pennsylvania. See methodology · corpus placement.

Mercer County standing, mid-flagged corpus third

Flagged-system rate 95.2% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 7.7% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 40.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #585 of 3,254 · #28 of 68 in Pennsylvania.

Flagged-rate neighbourhood around Mercer County

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

0% 20% 40% 60% 80% 100% Greene · lowest Perry · near Adams · near Sullivan · highest 66.7% 94.9% 94.9% 95.2% 95.2% 95.7% 100%

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

Water Systems

System Name Population Violations PFAS
Aqua PA Shenango Valley WTP 48,000 39 Detected
Greenville Muni Water Auth 8,600 438 Clean
Grove City Boro Water Dept 7,871 143 Clean
Sharpsville Boro Water Co 5,029 412 Detected
Pine Twp Water Distr System 3,082 60 -
Reynolds Water Company 2,370 382 -
Buhl Community Water Company 2,227 79 -
Aqua PA Lake Latonka WTP 1,600 38 Clean
Sandy Lake Boro 1,100 151 -
St Paul Homes 1,000 437 -
Plantation Park 1,000 97 -
Stoneboro Water Works 956 205 -
Shenango River Lake 950 57 -
Vacationland Campground 725 49 -
Jamestown Boro Water Auth 680 334 -
South Pymatuning 641 431 -
Commodore Perry School 550 146 -
PA DOT Rest Area 17 500 9 -
PA DOT Rest Area 18 500 10 -
Adventure Bound Shenango 500 77 -
Forrest Brooke MHP 491 248 -
Fredonia Boro 443 333 -
RV Village 400 92 -
Custaloga Town Scout Camp 300 100 -
Mercer Grove City KOA 300 96 -
Cozy Oaks RV Resort 300 97 -
Burger King #11027 300 34 -
Grove City Country Club 250 30 -
Pine Grove Mobile Home Park 244 202 -
Adesa Mercer 225 136 -
Keystone Charter School 225 103 -
Camp Nazareth 200 46 -
Last Minit Mart Jamestown 200 48 -
Dollar Gen 8289 Stoneboro 200 0 -
Ilsco Extrusions 175 23 -
Greenville MHP 150 1,386 -
County Line Cafe 150 49 -
Brass Lantern 150 52 -
Liberty Township 138 3 -
Leesburg Water Association 125 63 -
Cool Springs Fitness 125 30 -
Pine Hill Golf Course 110 5 -
Ull Scream 100 8 -
Temple Grove Campground 100 51 -
Jughandle (The) 100 33 -
Rudys Restaurant 100 25 -
Clark House 100 38 -
Mercer Cnty Livestock Auction 100 120 -
James Stoner VFW Post 6233 100 139 -
Delaware Twp Mun Bldg 100 22 -

Compare beyond Pennsylvania

Mid-flagged peers for Mercer County

Cross-state counties nearest Mercer County on flagged-system share (95.2%) and cumulative violation count (18,095). 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.