Endothall
Rapides Parish Waterworks District 3
Endothall is a herbicide used to kill aquatic plants and algae. It's also used on potato and cotton crops.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 5 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 94 ppb
The EWG Health Guideline of 94 ppb for endothall was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to the stomach and intestines.
EPA Maximum Contaminant
Level (MCL): 100 ppb
The legal limit for endothall, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1960s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-02-16 | 35375551002 | ND |
| 2018-02-16 | 35375551002 | ND |
| 2018-03-22 | 35381823001 | ND |
| 2018-03-22 | 35381823001 | ND |
| 2018-09-18 | 35418764001 | ND |
| 2018-09-18 | 35418764001 | ND |
| 2019-04-17 | 35463257001 | ND |
| 2019-04-17 | 35463257001 | ND |
| 2019-08-29 | 35494339001 | ND |
| 2019-08-29 | 35494339001 | ND |
| 2020-01-21 | 35525783003 | ND |
| 2020-01-21 | 35525783002 | ND |
| 2020-01-21 | 35525783001 | ND |
| 2020-03-11 | 35537099001 | ND |
| 2020-04-22 | 35545475001 | ND |
| 2020-10-12 | 35585145001 | ND |
| 2021-05-05 | 35631376001 | ND |
| 2021-05-05 | 35631376002 | ND |
| 2021-10-05 | 35668364001 | ND |
| 2022-04-18 | 35712509001 | ND |
| 2023-01-18 | 35773982001 | ND |
| 2023-01-18 | 35773982002 | ND |
| 2023-01-18 | 35773982003 | ND |
| 2023-04-03 | 35790618001 | ND |
| 2023-10-16 | 35835809001 | ND |