During routine testing of public water supply systems by the Washington State Department of Health, both the herbicide DCPA and increased nitrate were found in municipal wells in Quincy, Washington. Because both of these chemicals can be harmful to human health, WSDA, the Department of Health, the Columbia Basin Conservation District, and the City of Quincy worked together to collect more samples from wells in the region to find out if other wells had amounts of pesticides and nutrients that could be harmful to human health.
| Active Ingredient | Usage Type | Brand Name Examples | Use Examples | % of Drinking Water Standard |
|---|---|---|---|---|
| Atrazine and atrazine breakdown products | Herbicide | Aatrex, Atrazine | Corn, conifer, fallow land, industrial site, right-of-way, sorghum, turf | 3.7 |
| Dichlobenil or fluopicolide breakdown product | Herbicide or fungicide | Barrier, Casoron | Apple, berry, cherry, conifer, fencerow, grape, ornamental, pear, right-of-way | <1 |
| Total DCPA and DCPA breakdown products | Herbicide | Dacthal | Brassica, conifer, melon, ornamental, onion, strawberry, turf | 13.9 |
| Hexazinone | Herbicide | Velpar, Westar | Alfalfa, blueberry, industrial site, pasture, right-of-way, turf | <1 |
| Simazine | Herbicide | Princep, Sum-Trol | Apple, berry, cherry, corn, grape, ornamental, pear, turf | <1 |
