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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Dacthal


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

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.

 
Detected
Found above
health guidelines
Found above
legal limit
States
9
-
-
Water utilities
49
-
-
People Served
2,171,722
-
-

Dacthal Exposure by State

Water utilities in 9 states have reported detecting Dacthal in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Dacthal contamination
SystemsPopulation
California13907,826
New Jersey11640,087
Rhode Island8291,675
New York3231,150
Michigan247,397
Delaware238,186
Washington514,639
Iowa3455
Montana2307
Total492,171,722

The Most Polluted Communities

49 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)
1Pebble Gardens Mobile Home Ct
Missoula, MT
1251 of 216.67 ppb
(0 to 33.33 ppb)
2United Water Rhode Island
Wakefield, RI
17,50013 of 168.43 ppb
(0 to 27.6 ppb)
3Town of North Kingstown
North Kingstown, RI
24,00012 of 157.93 ppb
(0 to 39 ppb)
4City of Manteca
Manteca, CA
44,5002 of 25.3 ppb
(5.1 to 5.5 ppb)
5Kingston Water District
W. Kingston, RI
3,7004 of 63.94 ppb
(0 to 7.25 ppb)
6Andrews University
Berrien Springs, MI
2,5001 of 13 ppb
(3 ppb)
7Sportsman Trailer Park
Othello, WA
1502 of 22.39 ppb
(1.87 to 2.91 ppb)
8NJ American W Co Logan Sys
Haddon Heights, NJ
5,9671 of 12.39 ppb
(2.39 ppb)
9Portage
Grand Rapids, MI
44,8973 of 32.11 ppb
(1.33 to 3 ppb)
10City of West Richland
West Richland, WA
11,2001 of 11.77 ppb
(1.77 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

Testing Summary for Dacthal

Are tests routinely required for Dacthal by federal law?No
Water suppliers reporting tests for Dacthal (2004-2009):1,690 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.5 per year



Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)



references

government/industry list/academic study reference

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