Endothall
Columbia Water Company
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 6 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2020-04-07 | 22172792.00 | ND |
| 2020-04-07 | 22172822.00 | ND |
| 2020-04-13 | 22172852.00 | ND |
| 2020-07-06 | 22757698.00 | ND |
| 2020-07-07 | 22757705.00 | ND |
| 2020-07-13 | 22757909.00 | ND |
| 2023-04-04 | 28859618.00 | ND |
| 2023-04-10 | 28859619.00 | ND |
| 2023-04-17 | 28859803.00 | ND |
| 2023-07-10 | 29455567.00 | ND |
| 2023-07-14 | 29455568.00 | ND |
| 2023-07-14 | 29455569.00 | ND |