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National Drinking Water Database


Dacthal in Washington


Dacthal (DCPA) is an herbicide used on golf courses, home lawns and gardens, and strawberries, cotton, and soybeans; dacthal and its degradates are among the most commonly detected pesticide residues in drinking water wells.

The Most Polluted Communities in Washington

5 water utilities reported detecting Dacthal in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Dacthal level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Sportsman Trailer Park
Othello, WA
1502 of 22.39 ppb
(1.87 to 2.91 ppb)
2City of West Richland
West Richland, WA
11,2001 of 11.77 ppb
(1.77 ppb)
3Sage Hills Estates 1
Warden, WA
381 of 11.5 ppb
(1.5 ppb)
4City of Connell
Connell, WA
3,1901 of 10.69 ppb
(0.69 ppb)
5Rainier Tracts Water Assn
Othello, WA
611 of 30.11 ppb
(0 to 0.33 ppb)

Health Based Limits for Dacthal

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.70 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.70 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.350 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.80000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.80000 ppb

Violation Summary for Dacthal in Washington

There are no violations reported for this contaminant in Washington