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EWG's Tap Water Database — 2019 UPDATE

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DCPA di-acid degradate

Status: No national drinking water standard exists

 

DCPA di-acid degradate is a residue of the herbicide dacthal, or DCPA, which is used for urban, household and agricultural applications. Dacthal is a possible human carcinogen whose use was limited by the EPA in 2005 due to concerns about water contamination.

2015-2017:

FOUND

1

states detected

56

utilities detected

1.4 million

people served

States reporting DCPA di-acid degradate in drinking water

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Washington561,378,017
MORE
LESS

Filtering technologies that reduce DCPA di-acid degradate

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Activated Carbon

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Reverse Osmosis

Utilities with the highest amounts of DCPA di-acid degradate, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Hill Top AcresCollege Place, WA12 of 1275.5 ppb52
Golden Valley Water AssociationQuincy, WA2 of 233.9 ppb128
Weiler-martin Tracts Water AssociationQuincy, WA2 of 220.0 ppb775
Valle Lindo HomesWalla Walla, WA3 of 317.2 ppb570
Quincy Water Department, City OfQuincy, WA13 of 1317.0 ppb6,815
Key Ridge Water SystemGig Harbor, WA2 of 415.5 ppb63
Sportsman Trailer ParkEllensburg, WA1 of 13.78 ppb150
Bridle Moor Water AssociationYakima, WA1 of 13.62 ppb44
Country Corner Mobile Home ParkGig Harbor, WA1 of 13.10 ppb95
Admiral Water Users AssociationMoses Lake, WA1 of 13.00 ppb74
Highline Water District*Kent, WA1 of 12.20 ppb68,258
Sage Hills Second Water SystemWarden, WA1 of 11.93 ppb28
Arlenes AdditionBurbank, WA2 of 21.51 ppb480
Lakeview Park Water AssociationSoap Lake, WA2 of 21.45 ppb1,165
Country Lane EastOthello, WA1 of 10.650 ppb26
Othello Water Department*Othello, WA5 of 50.458 ppb6,495
Adams County Water District #1Othello, WA5 of 50.458 ppb740
Consolidated Irrigation District 14*College Place, WA1 of 20.450 ppb1,523
Blalock Orchard District 10Walla Walla, WA1 of 10.383 ppb250
Sage Hills Estates 1Warden, WA1 of 10.310 ppb38
Alps Mobile Home ParkMoxee, WA1 of 10.300 ppb150
Tieton Hills Water Co.Yakima, WA1 of 10.300 ppb75
Paterson Heights Water AssociationPaterson, WA2 of 20.295 ppb65
Connell, City ofConnell, WA4 of 60.275 ppb5,150
Goodnight Water SystemKennewick, WA2 of 20.249 ppb50
Cougar CampersCle Elum, WA2 of 20.230 ppb44
Royal City WaterRoyal City, WA6 of 80.188 ppb2,190
Diamond Point Water SystemCle Elum, WA1 of 10.187 ppb90
Walla Walla UniversityCollege Place, WA1 of 10.129 ppb900
White Bluff Water AssociationPasco, WA1 of 20.102 ppb111
Blalock Orchards District 12Walla Walla, WA1 of 10.0890 ppb150
Hydro Irrigation District #9*Walla Walla, WA1 of 10.0890 ppb240
City of SunnysideSunnyside, WA1 of 30.0800 ppb15,858
Towns Mobile Home ParkCashmere, WA1 of 30.0667 ppb35
City of Moses LakeMoses Lake, WA3 of 110.0545 ppb22,930
Whitstran Heights Water AssociationProsser, WA1 of 10.0440 ppb65
Seattle Public Utilities*Seattle, WA1 of 30.0433 ppb678,000
Highlands, Inc., TheShoreline, WA1 of 30.0433 ppb243
King County Water District #20*Seattle, WA1 of 30.0433 ppb31,710
North City Water DistrictShoreline, WA1 of 30.0433 ppb24,886
King County Water District #45Seattle, WA1 of 30.0433 ppb3,413
King County Water District #49*Burien, WA1 of 30.0433 ppb15,987
Soos Creek Water and Sewer DistrictRenton, WA1 of 30.0433 ppb62,898
Duvall, City OfDuvall, WA1 of 30.0433 ppb7,183
Northshore Utility District*Kenmore, WA1 of 30.0433 ppb70,146
Woodinville Water DistrictWoodinville, WA1 of 30.0433 ppb48,400
Coal Creek Utility District*Newcastle, WA1 of 30.0433 ppb11,833
King County Water District 119Duvall, WA1 of 30.0433 ppb3,250
City of Kirkland*Kirkland, WA1 of 30.0433 ppb40,648
City of Mercer IslandMercer Island, WA1 of 30.0433 ppb22,720

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report DCPA di-acid degradate, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Highline Water District*Kent, WA1 of 12.20 ppb68,258
City of SunnysideSunnyside, WA1 of 30.0800 ppb15,858
City of Moses LakeMoses Lake, WA3 of 110.0545 ppb22,930
Seattle Public Utilities*Seattle, WA1 of 30.0433 ppb678,000
City of Mercer IslandMercer Island, WA1 of 30.0433 ppb22,720
City of Kirkland*Kirkland, WA1 of 30.0433 ppb40,648
Coal Creek Utility District*Newcastle, WA1 of 30.0433 ppb11,833
Woodinville Water DistrictWoodinville, WA1 of 30.0433 ppb48,400
Northshore Utility District*Kenmore, WA1 of 30.0433 ppb70,146
Soos Creek Water and Sewer DistrictRenton, WA1 of 30.0433 ppb62,898
King County Water District #49*Burien, WA1 of 30.0433 ppb15,987
North City Water DistrictShoreline, WA1 of 30.0433 ppb24,886
King County Water District #20*Seattle, WA1 of 30.0433 ppb31,710

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report DCPA di-acid degradate, but it likely has the contaminant in its water supply.