Endothall
Bear Valley Joint Authority
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 | 4 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-04-24 | 8045215-01 | ND |
| 2018-05-29 | 8055386-01 | ND |
| 2018-07-17 | 8074944-01 | ND |
| 2018-11-27 | 8114887-01RE | ND |
| 2019-02-19 | 9024042-01 | ND |
| 2019-11-13 | 9036887-01 | ND |
| 2020-01-29 | 21798046.00 | ND |
| 2020-04-15 | 22362540.00 | ND |
| 2020-04-29 | 22362565.00 | ND |
| 2020-07-29 | 22949597.00 | ND |
| 2020-08-19 | 23136901.00 | ND |
| 2023-06-08 | 29254345.00 | ND |
| 2023-06-08 | 29254320.00 | ND |
| 2023-07-18 | 29448269.00 | ND |
| 2023-08-22 | 29651744.00 | ND |