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.
| State | Water Suppliers with Dacthal contamination | |
|---|---|---|
| Systems | Population | |
| California | 13 | 907,826 |
| New Jersey | 11 | 640,087 |
| Rhode Island | 8 | 291,675 |
| New York | 3 | 231,150 |
| Michigan | 2 | 47,397 |
| Delaware | 2 | 38,186 |
| Washington | 5 | 14,639 |
| Iowa | 3 | 455 |
| Montana | 2 | 307 |
| Total | 49 | 2,171,722 |
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
| Rank | System | Population Served | Positive test results of total reported tests | Average Level (Range) |
|---|---|---|---|---|
| 1 | Pebble Gardens Mobile Home Ct Missoula, MT | 125 | 1 of 2 | 16.67 ppb (0 to 33.33 ppb) |
| 2 | United Water Rhode Island Wakefield, RI | 17,500 | 13 of 16 | 8.43 ppb (0 to 27.6 ppb) |
| 3 | Town of North Kingstown North Kingstown, RI | 24,000 | 12 of 15 | 7.93 ppb (0 to 39 ppb) |
| 4 | City of Manteca Manteca, CA | 44,500 | 2 of 2 | 5.3 ppb (5.1 to 5.5 ppb) |
| 5 | Kingston Water District W. Kingston, RI | 3,700 | 4 of 6 | 3.94 ppb (0 to 7.25 ppb) |
| 6 | Andrews University Berrien Springs, MI | 2,500 | 1 of 1 | 3 ppb (3 ppb) |
| 7 | Sportsman Trailer Park Othello, WA | 150 | 2 of 2 | 2.39 ppb (1.87 to 2.91 ppb) |
| 8 | NJ American W Co Logan Sys Haddon Heights, NJ | 5,967 | 1 of 1 | 2.39 ppb (2.39 ppb) |
| 9 | Portage Grand Rapids, MI | 44,897 | 3 of 3 | 2.11 ppb (1.33 to 3 ppb) |
| 10 | City of West Richland West Richland, WA | 11,200 | 1 of 1 | 1.77 ppb (1.77 ppb) |
Health Based Limits for Dacthal
| Standard | Description | Level |
|---|---|---|
| Lifetime health-based limit, non-cancer risk | Concentration 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 Level | A 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 Level | A 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 exposure | Concentration 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 exposure | Concentration 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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