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EWG's Tap Water Database — 2021 UPDATE

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DCPA mono- and di-acid degradates

Status: No national drinking water standard exists

 

DCPA degradates are residues 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.

2017-2019:

FOUND

2

states detected

27

utilities detected

746,000

people served

States reporting DCPA mono- and di-acid degradates in drinking water

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
California23675,234
Delaware470,329
MORE
LESS

Filtering technologies that reduce DCPA mono- and di-acid degradates

Activated Carbon

Reverse Osmosis

Utilities with the highest amounts of DCPA mono- and di-acid degradates, 2017-2019

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Sands PointPort Washington, NY24 of 337.03 ppb2,800
City of ChinoChino, CA7 of 104.61 ppb18,907
WA of Great Neck NorthGreat Neck, NY12 of 204.13 ppb31,400
Stagecoach GidStagecoach, NV1 of 21.35 ppb1,411
Three RiversEllsworth, MI1 of 21.000 ppb7,811
Chino Basin Desalter Authority - Desalter 2*Ontario, CA9 of 120.920 ppb0
Foothill Estates WsSan Jose, CA4 of 40.638 ppb183
Antelope Valley - East Kern Water Agency*Palmdale, CA2 of 40.625 ppb0
Ocean View Water DepartmentOcean View, DE1 of 60.400 ppb2,688
Bethany Bay Ocean View*Dover, DE1 of 60.400 ppb34,500
San Juan Bautista, City Of*San Juan Bautista, CA1 of 10.300 ppb1,720
Golden State Water Company - Arden Water ServicesRancho Cordova, CA2 of 50.290 ppb5,653
California Water Service (CWS) - SalinasSan Jose, CA10 of 910.235 ppb106,858
Frederica Pump DistrictDover, DE1 of 60.200 ppb441
Rehoboth DistrictDover, DE1 of 140.0529 ppb32,700
California Water Service Company Oak HillsSan Jose, CA1 of 50.0440 ppb3,904
Golden State Water Company - Cordova*Rancho Cordova, CA1 of 100.0390 ppb47,810
California Water Service - South San FranciscoSan Jose, CA1 of 30.0333 ppb56,110
Winnemucca, City ofWinnemucca, NV1 of 40.0250 ppb8,066
Central Coast Water Authority*Buellton, CA1 of 60.0217 ppb0
California American Water Company - AntelopeSacramento, CA1 of 170.0141 ppb34,168
Soquel Creek Water DistrictSoquel, CA1 of 400.0120 ppb37,720
San Diego County Water Authority*Escondido, CA2 of 230.0104 ppb0
Valley Center MWD*Valley Center, CA2 of 230.0104 ppb25,450
Ramona Municipal WDRamona, CA2 of 230.0104 ppb40,000
Rincon Del Diablo MWD(ID-1)Escondido, CA2 of 230.0104 ppb24,545
Rainbow Municipal WDFallbrook, CA2 of 230.0104 ppb19,611
City of CarlsbadCarlsbad, CA2 of 230.0104 ppb84,838
Vallecitos Water DistrictSan Marcos, CA2 of 230.0104 ppb94,871
City of SonomaSonoma, CA1 of 120.01000 ppb10,807
California American Water Company - ParkwaySacramento, CA1 of 160.00813 ppb44,949
Oxnard Water Department*Oxnard, CA1 of 290.00724 ppb200,855
Santa Cruz Water DepartmentSanta Cruz, CA1 of 380.00447 ppb94,887
San Gabriel Valley Water Company - FontanaFontana, CA2 of 730.00343 ppb213,209

* 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 mono- and di-acid degradates, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
City of ChinoChino, CA7 of 104.61 ppb18,907
WA of Great Neck NorthGreat Neck, NY12 of 204.13 ppb31,400
Bethany Bay Ocean View*Dover, DE1 of 60.400 ppb34,500
California Water Service (CWS) - SalinasSan Jose, CA10 of 910.235 ppb106,858
Rehoboth DistrictDover, DE1 of 140.0529 ppb32,700
Golden State Water Company - Cordova*Rancho Cordova, CA1 of 100.0390 ppb47,810
California Water Service - South San FranciscoSan Jose, CA1 of 30.0333 ppb56,110
California American Water Company - AntelopeSacramento, CA1 of 170.0141 ppb34,168
Soquel Creek Water DistrictSoquel, CA1 of 400.0120 ppb37,720
Vallecitos Water DistrictSan Marcos, CA2 of 230.0104 ppb94,871
City of CarlsbadCarlsbad, CA2 of 230.0104 ppb84,838
Rainbow Municipal WDFallbrook, CA2 of 230.0104 ppb19,611
Rincon Del Diablo MWD(ID-1)Escondido, CA2 of 230.0104 ppb24,545
Ramona Municipal WDRamona, CA2 of 230.0104 ppb40,000
Valley Center MWD*Valley Center, CA2 of 230.0104 ppb25,450
City of SonomaSonoma, CA1 of 120.01000 ppb10,807
California American Water Company - ParkwaySacramento, CA1 of 160.00813 ppb44,949
Oxnard Water Department*Oxnard, CA1 of 290.00724 ppb200,855
Santa Cruz Water DepartmentSanta Cruz, CA1 of 380.00447 ppb94,887
San Gabriel Valley Water Company - FontanaFontana, CA2 of 730.00343 ppb213,209

* 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 mono- and di-acid degradates, but it likely has the contaminant in its water supply.