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EWG's Tap Water Database — 2019 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.

2015-2017:

FOUND

4

states detected

35

utilities detected

2.9 million

people served

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

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Virginia21,289,422
California27950,272
District Of Columbia3648,882
New York234,200
Nevada18,066
MORE
LESS

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

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Activated Carbon

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Reverse Osmosis

Utilities with the highest amounts of DCPA mono- and di-acid degradates, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Sands PointPort Washington, NY24 of 288.29 ppb2,800
WA of Great Neck NorthGreat Neck, NY12 of 204.13 ppb31,400
City of ChinoChino, CA4 of 63.94 ppb18,907
Foothill Estates WsSan Jose, CA2 of 20.670 ppb183
California Water Service (CWS) - SalinasSan Jose, CA9 of 330.470 ppb106,858
Elsinore Valley Municipal Water District*Lake Elsinore, CA1 of 20.240 ppb142,264
California Water Service Company Oak HillsSan Jose, CA1 of 20.110 ppb3,904
Winnemucca, City ofWinnemucca, NV1 of 20.0500 ppb8,066
Central Coast Water Authority*Buellton, CA1 of 30.0433 ppb0
California Water Service - South San FranciscoSan Jose, CA1 of 30.0333 ppb56,110
Oxnard Water DepartmentOxnard, CA1 of 110.0191 ppb200,855
San Gabriel Valley Water Company - FontanaFontana, CA2 of 370.00676 ppb213,209
Washington Aqueduct Division*Washington, DC1 of 240.00417 ppb0
D.C. Water and Sewer Authority*Washington, DC1 of 240.00417 ppb632,323
Arlington County*Arlington, VA1 of 240.00417 ppb215,000

* 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
WA of Great Neck NorthGreat Neck, NY12 of 204.13 ppb31,400
City of ChinoChino, CA4 of 63.94 ppb18,907
California Water Service (CWS) - SalinasSan Jose, CA9 of 330.470 ppb106,858
Elsinore Valley Municipal Water District*Lake Elsinore, CA1 of 20.240 ppb142,264
California Water Service - South San FranciscoSan Jose, CA1 of 30.0333 ppb56,110
Oxnard Water DepartmentOxnard, CA1 of 110.0191 ppb200,855
San Gabriel Valley Water Company - FontanaFontana, CA2 of 370.00676 ppb213,209
D.C. Water and Sewer Authority*Washington, DC1 of 240.00417 ppb632,323
Arlington County*Arlington, VA1 of 240.00417 ppb215,000

* 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.