Picloram
Lignite, 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 | 0.165 ppb | 4 | 4 | 0.104 ppb - 0.217 ppb |
| 2019 | 0.187 ppb | 4 | 2 | ND - 0.528 ppb |
| 2020 | 0.390 ppb | 4 | 3 | ND - 1.14 ppb |
| 2021 | 0.0788 ppb | 4 | 2 | ND - 0.168 ppb |
| 2022 | 0.113 ppb | 5 | 4 | ND - 0.199 ppb |
| 2023 | 0.0960 ppb | 4 | 2 | ND - 0.231 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 |
|---|---|---|
| 2018-03-19 | 18-S354 | 0.104 ppb |
| 2018-07-23 | 18-S1226 | 0.150 ppb |
| 2018-09-04 | 18-S1946 | 0.187 ppb |
| 2018-11-05 | 18-S2310 | 0.217 ppb |
| 2019-02-26 | 19-S244 | ND |
| 2019-05-20 | 19-S656 | 0.219 ppb |
| 2019-09-10 | 19-S1967 | 0.528 ppb |
| 2019-11-04 | 19-S2352 | ND |
| 2020-02-18 | 361501 | 0.204 ppb |
| 2020-06-29 | 369874 | ND |
| 2020-09-22 | 373588 | 1.14 ppb |
| 2020-12-21 | 374368 | 0.215 ppb |
| 2021-02-22 | 379762 | 0.168 ppb |
| 2021-06-07 | 380948 | 0.147 ppb |
| 2021-09-13 | 386525 | ND |
| 2021-12-06 | 389480 | ND |
| 2022-02-28 | 392618 | 0.106 ppb |
| 2022-03-21 | 395285 | 0.108 ppb |
| 2022-06-06 | 396363 | 0.199 ppb |
| 2022-08-29 | 400994 | 0.152 ppb |
| 2022-11-15 | 403854 | ND |
| 2023-01-09 | 405818 | 0.231 ppb |
| 2023-04-10 | 409315 | 0.153 ppb |
| 2023-09-11 | 416138 | ND |
| 2023-11-07 | 418942 | ND |