Endothall
Gurdon Waterworks
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 | 4 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-01-22 | 18025000704 | ND |
| 2018-01-22 | 18025000804 | ND |
| 2018-04-24 | 18115005404 | ND |
| 2018-04-24 | 18115005504 | ND |
| 2019-01-23 | 19024002004 | ND |
| 2019-04-30 | 19122001704 | ND |
| 2019-08-06 | 19220001804 | ND |
| 2019-11-18 | 19324000204 | ND |
| 2021-02-09 | 21041002204 | ND |
| 2021-02-09 | 21041002104 | ND |
| 2021-04-05 | 21098004104 | ND |
| 2021-04-05 | 21098004004 | ND |
| 2022-01-11 | 22013002604 | ND |
| 2022-05-04 | O197615-END-1 | ND |