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States / Minnesota

Washington County, MN

The federal environmental record for Washington County (population 278,936): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.

3

Superfund NPL sites

6

federal cleanup sites

11

PFAS-detecting water systems

12

TRI facilities

8

open tank releases

Superfund NPL sites

SiteCityStatusListed
Baytown Township Ground Water PlumeBaytown Townshipon the NPL12/16/1994
Oakdale DumpOakdaleon the NPL09/08/1983
Washington County LandfillLake Elmodeleted09/21/1984

Drinking water: PFAS testing

Public water systems serving Washington 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
Lake Elmo

MN1820009

PFBA: 140 ng/L

PFOA: 12 ng/L

PFPeA: 3.2 ng/L

above final limit
Newport

MN1820014

PFBA: 550 ng/L

PFPeA: 24 ng/L

PFHxA: 7.6 ng/L

above final limit
Stillwater

MN1820024

PFBA: 118 ng/L

PFOS: 8.1 ng/L

PFHxS: 7.2 ng/L

above final limit
Woodbury

MN1820025

PFBA: 386 ng/L

PFPeA: 17.2 ng/L

PFOA: 17.1 ng/L

above final limit
Cottage Grove

MN1820004

PFBA: 220 ng/L

PFPeA: 6.4 ng/L

detected
Hugo

MN1820007

PFBA: 19.8 ng/L

detected
Mahtomedi

MN1820013

PFBA: 21 ng/L

detected
Oakdale

MN1820016

PFBA: 1270 ng/L

detected
Saint Paul Park

MN1820018

PFBA: 1700 ng/L

detected
Oak Park Heights

MN1820020

PFBA: 130 ng/L

PFHxS: 7.4 ng/L

PFPeA: 4.8 ng/L

detected
Lakeland Municipal Water

MN1820029

PFBA: 7.6 ng/L

detected

On a system with detections? Testing and treatment options

Facilities reporting toxic releases (2024)

12 facilities in Washington filed TRI reports for 2024, totalling 1.0M lb released.

FacilityCityTop chemicalsTotal released
3M CHEMICAL OPERATIONS' COTTAGE GROVE FACILITYCOTTAGE GROVENitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid472k lb
ST PAUL PARK REFINING CO LLCSAINT PAUL PARKNitrate compounds (water dissociable; reportable only when in aqueous solution), Hydrogen cyanide224k lb
XCEL ENERGY A. S. KING GENERATING PLANTBAYPORTBarium And Barium Compounds, Ammonia140k lb
LSP - COTTAGE GROVE LPCOTTAGE GROVEAmmonia99k lb
ANDERSEN CORPBAYPORTXylene (mixed isomers), Ethylbenzene75k lb
HOLCIM - MWR INC. NEWPORT READY MIXNEWPORTNitrate compounds (water dissociable; reportable only when in aqueous solution), Lead And Lead Compounds220 lb
HEARING COMPONENTS INC.SAINT PAULDiisocyanates4 lb
AYRSHIRE ELECTRONICS MNSAINT PAULLead1 lb
KNIFE RIVER CORP N CENTRAL FOREST LAKEFOREST LAKELead0 lb
UP NORTH PLASTICS INCCOTTAGE GROVE-0 lb
THE VOLLRATH CO. LLCNEWPORT-0 lb
EAST SIDE JERSEY DAIRYWOODBURY-0 lb

Underground fuel tanks

EPA's UST Finder records 310 tank facilities in Washington: 301 tanks in service and 680 closed. 244 fuel releases are on record, of which 8 remain open. Open releases are cleanups that have not reached "no further action".

Radon

EPA maps Washington 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 Washington, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.

  • BAYTOWN PCE PLUME - SA 115BAYTOWN TOWNSHIP
  • BAYTOWN TOWNSHIP GROUND WATER PLUMEBAYTOWN TOWNSHIP
  • BNSF RR TANKER SPILLPOINT DOUGLAS
  • OAKDALE DUMPOAKDALE
  • SHORTY'S CLEANERS & LAUNDERERSSTILLWATER
  • WASHINGTON COUNTY LANDFILLLAKE ELMO