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EWG's Tap Water Database

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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:

FOUND

3

states detected

26

utilities detected

2.1 million

people served

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

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Virginia21,269,000
District Of Columbia3644,822
California20228,247
New York12,800
MORE
LESS

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

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Sands PointPort Washington, NY5 of 54.50 ppb2,800
City of ChinoChino, CA4 of 63.94 ppb18,907
Foothill Estates WsSan Jose, CA2 of 20.670 ppb183
Manana WoodsScotts Valley, CA1 of 10.160 ppb350
Central Coast Water Authority*Buellton, CA1 of 10.130 ppb0
Washington Aqueduct Division*Washington, DC1 of 80.0125 ppb0

* 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, CA4 of 63.94 ppb18,907