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:
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 | Utilities | People Served | |
| Virginia | 2 | 1,289,422 | |
| California | 27 | 950,272 | |
| District Of Columbia | 3 | 648,882 | |
| New York | 2 | 34,200 | |
| Nevada | 1 | 8,066 | |
Filtering technologies that reduce DCPA mono- and di-acid degradates
Activated Carbon
Reverse Osmosis
Utilities with the highest amounts of DCPA mono- and di-acid degradates, 2015-2017
| Utility | Location | Tests | Average level | People served |
|---|---|---|---|---|
| Sands Point | Port Washington, NY | 24 of 28 | 8.29 ppb | 2,800 |
| WA of Great Neck North | Great Neck, NY | 12 of 20 | 4.13 ppb | 31,400 |
| City of Chino | Chino, CA | 4 of 6 | 3.94 ppb | 18,907 |
| Foothill Estates Ws | San Jose, CA | 2 of 2 | 0.670 ppb | 183 |
| California Water Service (CWS) - Salinas | San Jose, CA | 9 of 33 | 0.470 ppb | 106,858 |
| Elsinore Valley Municipal Water District* | Lake Elsinore, CA | 1 of 2 | 0.240 ppb | 142,264 |
| California Water Service Company Oak Hills | San Jose, CA | 1 of 2 | 0.110 ppb | 3,904 |
| Winnemucca, City of | Winnemucca, NV | 1 of 2 | 0.0500 ppb | 8,066 |
| Central Coast Water Authority* | Buellton, CA | 1 of 3 | 0.0433 ppb | 0 |
| California Water Service - South San Francisco | San Jose, CA | 1 of 3 | 0.0333 ppb | 56,110 |
| Oxnard Water Department | Oxnard, CA | 1 of 11 | 0.0191 ppb | 200,855 |
| San Gabriel Valley Water Company - Fontana | Fontana, CA | 2 of 37 | 0.00676 ppb | 213,209 |
| Washington Aqueduct Division* | Washington, DC | 1 of 24 | 0.00417 ppb | 0 |
| D.C. Water and Sewer Authority* | Washington, DC | 1 of 24 | 0.00417 ppb | 632,323 |
| Arlington County* | Arlington, VA | 1 of 24 | 0.00417 ppb | 215,000 |
* 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.
| Utility | Location | Tests | Average level | People served |
|---|---|---|---|---|
| WA of Great Neck North | Great Neck, NY | 12 of 20 | 4.13 ppb | 31,400 |
| City of Chino | Chino, CA | 4 of 6 | 3.94 ppb | 18,907 |
| California Water Service (CWS) - Salinas | San Jose, CA | 9 of 33 | 0.470 ppb | 106,858 |
| Elsinore Valley Municipal Water District* | Lake Elsinore, CA | 1 of 2 | 0.240 ppb | 142,264 |
| California Water Service - South San Francisco | San Jose, CA | 1 of 3 | 0.0333 ppb | 56,110 |
| Oxnard Water Department | Oxnard, CA | 1 of 11 | 0.0191 ppb | 200,855 |
| San Gabriel Valley Water Company - Fontana | Fontana, CA | 2 of 37 | 0.00676 ppb | 213,209 |
| D.C. Water and Sewer Authority* | Washington, DC | 1 of 24 | 0.00417 ppb | 632,323 |
| Arlington County* | Arlington, VA | 1 of 24 | 0.00417 ppb | 215,000 |
* 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.