Endothall
North Penn Water 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 22 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2020-04-01 | 22023052.00 | ND |
| 2020-04-01 | 22023022.00 | ND |
| 2020-04-01 | 22022992.00 | ND |
| 2020-04-01 | 22022962.00 | ND |
| 2020-04-01 | 22023130.00 | ND |
| 2020-04-13 | 22023344.00 | ND |
| 2020-04-13 | 22023314.00 | ND |
| 2020-04-13 | 22023284.00 | ND |
| 2020-04-13 | 22023254.00 | ND |
| 2020-04-21 | 22023912.00 | ND |
| 2020-05-04 | 22215386.00 | ND |
| 2020-07-06 | 22607328.00 | ND |
| 2020-07-06 | 22607358.00 | ND |
| 2020-07-06 | 22607298.00 | ND |
| 2020-07-06 | 22607388.00 | ND |
| 2020-07-06 | 22608057.00 | ND |
| 2020-08-10 | 22799608.00 | ND |
| 2020-08-10 | 22799578.00 | ND |
| 2020-08-10 | 22799488.00 | ND |
| 2020-08-12 | 22799548.00 | ND |
| 2020-08-12 | 22799518.00 | ND |
| 2020-08-31 | 22999387.00 | ND |
| 2023-04-12 | 28702840.00 | ND |
| 2023-04-12 | 28702837.00 | ND |
| 2023-04-12 | 28702839.00 | ND |
| 2023-04-12 | 28702838.00 | ND |
| 2023-07-19 | 29498009.00 | ND |
| 2023-07-19 | 29498007.00 | ND |
| 2023-07-19 | 29498008.00 | ND |
| 2023-07-19 | 29498006.00 | ND |