Picloram
Warwick, City of
Picloram is a herbicide that in studies of laboratory animals has been linked with reduced testicular size and damage to the liver and thyroid.
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 | 0.401 ppb | 4 | 4 | 0.363 ppb - 0.444 ppb |
| 2019 | 0.628 ppb | 4 | 4 | 0.523 ppb - 0.902 ppb |
| 2020 | 1.23 ppb | 4 | 4 | 0.589 ppb - 2.92 ppb |
| 2021 | 0.637 ppb | 2 | 2 | 0.634 ppb - 0.640 ppb |
| 2022 | 0.685 ppb | 4 | 4 | 0.519 ppb - 0.865 ppb |
| 2023 | 0.771 ppb | 4 | 4 | 0.566 ppb - 0.918 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 166 ppb
The EWG Health Guideline of 166 ppb for picloram 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 change to internal organs.
EPA Maximum Contaminant
Level (MCL): 500 ppb
The legal limit for picloram, established in 1992, was based on toxicity studies in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-20 | 18-S359 | 0.444 ppb |
| 2018-07-24 | 18-S1241 | 0.409 ppb |
| 2018-09-04 | 18-S1945 | 0.363 ppb |
| 2018-11-06 | 18-S2318 | 0.386 ppb |
| 2019-02-25 | 19-S243 | 0.523 ppb |
| 2019-05-29 | 19-S681 | 0.547 ppb |
| 2019-09-10 | 19-S1971 | 0.902 ppb |
| 2019-11-06 | 19-S2373 | 0.538 ppb |
| 2020-02-19 | 361502 | 0.647 ppb |
| 2020-06-29 | 369875 | 0.589 ppb |
| 2020-09-22 | 373586 | 2.92 ppb |
| 2020-12-15 | 374367 | 0.748 ppb |
| 2021-02-24 | 379763 | 0.634 ppb |
| 2021-06-09 | 380949 | 0.640 ppb |
| 2022-03-01 | 392619 | 0.519 ppb |
| 2022-06-09 | 396366 | 0.756 ppb |
| 2022-08-30 | 400997 | 0.599 ppb |
| 2022-11-15 | 403850 | 0.865 ppb |
| 2023-01-09 | 405823 | 0.834 ppb |
| 2023-05-23 | 411744 | 0.918 ppb |
| 2023-09-12 | 416155 | 0.566 ppb |
| 2023-11-07 | 418943 | 0.764 ppb |