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States / Pennsylvania

Chester County, PA

The federal environmental record for Chester County (population 545,823): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.

11

Superfund NPL sites

18

federal cleanup sites

11

PFAS-detecting water systems

36

TRI facilities

73

open tank releases

Superfund NPL sites

SiteCityStatusListed
A.I.W. Frank/Mid-County MustangExtonon the NPL10/04/1989
Blosenski LandfillWest Caln Townshipon the NPL09/08/1983
Foote Mineral Co.East Whiteland Townshipon the NPL10/14/1992
KimbertonKimberton Boroughon the NPL09/08/1983
Malvern TCEMalvernon the NPL09/08/1983
Old Wilmington Road Ground Water ContaminationSadsburyvilleon the NPL02/04/2000
Paoli Rail YardPaolion the NPL08/30/1990
Recticon/Allied Steel Corp.East Conventry Townshipdeleted10/04/1989
Strasburg LandfillNewlin Townshipdeleted03/31/1989
Walsh LandfillHoneybrook Townshipon the NPL09/21/1984
William Dick LagoonsWest Caln Townshipon the NPL07/22/1987

Drinking water: PFAS testing

Public water systems serving Chester with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.

SystemHighest resultsReading
DOWNINGTOWN WATER AUTHORITY

PA1150026

PFOA: 4.2 ng/L

PFBS: 3.8 ng/L

PFPeA: 3.4 ng/L

above final limit
AQUA PA UWCHLAN

PA1150035

PFOA: 9.3 ng/L

PFPeA: 7.7 ng/L

PFOS: 7.1 ng/L

above final limit
OXFORD BOROUGH

PA1150066

PFPeA: 6.6 ng/L

PFHxA: 5.9 ng/L

PFBS: 5.4 ng/L

above final limit
PHOENIXVILLE WATER DEPT

PA1150077

PFBA: 57.3 ng/L

PFPeA: 10.2 ng/L

PFBS: 9.8 ng/L

above final limit
AQUA PA SPRING RUN

PA1150089

PFPeA: 8 ng/L

PFHxA: 7 ng/L

PFOA: 6.8 ng/L

above final limit
AQUA PA WEST CHESTER

PA1150098

PFPeA: 7.4 ng/L

PFHxA: 7.2 ng/L

PFOA: 5.9 ng/L

above final limit
KENNETT SQUARE MUN WATER WORKS

PA1150108

PFBA: 18.9 ng/L

PFOA: 17.7 ng/L

PFOS: 14.4 ng/L

above final limit
AQUA PA FRIENDSHIP

PA1150137

PFOS: 9.5 ng/L

PFBS: 8.5 ng/L

PFOA: 7.7 ng/L

above final limit
PA AMERICAN ROYERSFORD

PA1150166

PFOS: 10.7 ng/L

PFOA: 9.1 ng/L

PFBS: 7 ng/L

above final limit
PA AMERICAN COATESVILLE

PA1150106

PFBA: 5.5 ng/L

PFPeA: 3.2 ng/L

detected
LONDON GROVE TWP MUN AUTH

PA1150165

PFBA: 6.5 ng/L

PFBS: 3.5 ng/L

PFHxA: 3.5 ng/L

detected

On a system with detections? Testing and treatment options

Facilities reporting toxic releases (2024)

36 facilities in Chester filed TRI reports for 2024, totalling 175k lb released. The 25 largest by volume:

FacilityCityTop chemicalsTotal released
CLEVELAND-CLIFFS PLATE LLC COATESVILLE FACILITYCOATESVILLENickel And Nickel Compounds, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)113k lb
JOHNSON MATTHEY INCWAYNENitrate compounds (water dissociable; reportable only when in aqueous solution), Ammonia21k lb
ARKEMA WEST CHESTER PLANTWEST CHESTERToluene, Acrylic acid13k lb
AGC CHEMICALS AMERICAS INCDOWNINGTOWNCopper6k lb
TAYLOR INDUSTRIES INC.PARKER FORDStyrene5k lb
DELAWARE VALLEY CUSTOM MARBLE INCWEST GROVEStyrene5k lb
METALLURGICAL PRODUCTS COWEST CHESTERCopper, Nickel5k lb
WHITFORD CORPELVERSONN-Methyl-2-pyrrolidone, Certain glycol ethers4k lb
ACTION MANUFACTURING COATGLENLead And Lead Compounds1k lb
DSM BIOMEDICALEXTONN,N-Dimethylformamide750 lb
HENRY COKIMBERTON1,2,4-Trimethylbenzene, Polycyclic aromatic compounds477 lb
BRANDYWINE MACHINE CO INCDOWNINGTOWNChromium, Nickel315 lb
LENAPE FORGED PRODUCTS CORPWEST CHESTERCopper, Nickel41 lb
SILVI CONCRETE OF DOWNINGTOWNDOWNINGTOWNAluminum oxide (fibrous forms)29 lb
NATHAN TROTTER & CO. INC.COATESVILLELead10 lb
FENZI AGT USA LLCDOWNINGTOWNCertain glycol ethers, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)10 lb
STEIN LLCCOATESVILLEManganese And Manganese Compounds, Lead And Lead Compounds6 lb
THE ROCK KAMPS LLCCOATESVILLELead6 lb
TIN TECHNOLOGY & REFININGWEST CHESTERLead4 lb
ZEKS COMPRESSED AIR SOLUTIONSWEST CHESTERChromium, Nickel3 lb
DFT INC.EXTON-0 lb
FORCE INDUSTRIES DIVISONPAOLI-0 lb
WIRE & CABLE SPECIALTIES INCCOATESVILLE-0 lb
HMA CONCRETE LLC DBA HERITAGE CONCRTETE AVONDALE FACILITYAVONDALE-0 lb
ELDREDGE INC.WEST CHESTER-0 lb

Underground fuel tanks

EPA's UST Finder records 1,148 tank facilities in Chester: 597 tanks in service and 2,860 closed. 691 fuel releases are on record, of which 73 remain open. Open releases are cleanups that have not reached "no further action".

Radon

EPA maps Chester as Zone 1, the highest predicted indoor radon levels (over 4 pCi/L average). Radon and air quality are covered in depth on lung.com.

The record for one specific address

County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.

Get the report - $39

All federal cleanup sites on file

The wider Superfund enterprise inventory (SEMS) for Chester, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.

  • A.I.W. FRANK/MID-COUNTY MUSTANGEXTON
  • BLOSENSKI LANDFILLWEST CALN TOWNSHIP
  • FOOTE MINERAL CO.FRAZER
  • FORMER MEDIA NIKE MISSILE BATTERY PH-75/78 CONTROL AREANEWTOWN SQUARE
  • FRONT STREET TANKERCHESTER
  • KENNETT SQUARE JUNKYARDKENNETT SQUARE
  • KIMBERTONEAST PIKELAND TOWNSHIP
  • MALVERN TCEMALVERN
  • MODENA FLOOD RELEASEMODENA
  • MODENA YARDMODENA
  • OLD WILMINGTON ROAD GW CONTAMINATIONWEST CALN TOWNSHIP
  • OLD WILMINGTON ROAD SITE - AKA - OLD WILM. RD. GRNDWTR. CONTAMTNWEST CALN TOWNSHIP
  • PAOLI RAIL YARDPAOLI
  • RECTICON/ALLIED STEEL CORP.PARKER FORD
  • STRASBURG LANDFILLNEWLIN TOWNSHIP
  • VALLEY FORGE ARMY HOSPITALPHOENIXVILLE
  • WALSH LANDFILLHONEYBROOK TOWNSHIP
  • WILLIAM DICK LAGOONSWAGONTOWN