Endothall
City of Napa
Endothall is a herbicide used to kill aquatic plants and algae. It's also used on potato and cotton crops.
15
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-07-09 | 9590-005-1145 | ND |
| 2014-07-09 | 9590-006-1245 | ND |
| 2014-07-09 | 9590-007-0925 | ND |
| 2015-07-21 | 9590-005-1120 | ND |
| 2015-07-21 | 9590-006-1415 | ND |
| 2015-07-21 | 9590-007-0940 | ND |
| 2016-07-27 | 9590-006-1245 | ND |
| 2016-07-27 | 9590-006-1545 | ND |
| 2017-07-20 | 9590-006-1330 | ND |
| 2017-07-20 | 9590-007-1050 | ND |
| 2017-09-13 | 9590-005-0840 | ND |
| 2018-07-11 | 9590-006-1015 | ND |
| 2018-07-11 | 9590-007-1200 | ND |
| 2019-07-10 | 1644-007-0830 | ND |
| 2019-07-10 | 1644-007-1200 | ND |