Picloram
Castle Rock
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 |
|---|---|---|---|---|
| 2014 | ND | 7 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 5 | 0 | ND |
| 2017 | ND | 10 | 0 | ND |
| 2018 | 0.0125 ppb | 8 | 1 | ND - 0.1000 ppb |
| 2019 | ND | 8 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 | Result |
|---|---|
| 2014-02-04 | ND |
| 2014-04-29 | ND |
| 2014-07-21 | ND |
| 2014-07-22 | ND |
| 2014-11-19 | ND |
| 2014-12-04 | ND |
| 2014-12-04 | ND |
| 2015-08-05 | ND |
| 2016-02-23 | ND |
| 2016-02-24 | ND |
| 2016-05-23 | ND |
| 2016-06-27 | ND |
| 2016-11-14 | ND |
| 2017-02-21 | ND |
| 2017-02-21 | ND |
| 2017-03-22 | ND |
| 2017-04-18 | ND |
| 2017-04-18 | ND |
| 2017-05-16 | ND |
| 2017-06-21 | ND |
| 2017-07-17 | ND |
| 2017-07-17 | ND |
| 2017-10-18 | ND |
| 2018-03-20 | 0.1000 ppb |
| 2018-03-20 | ND |
| 2018-05-21 | ND |
| 2018-08-30 | ND |
| 2018-09-13 | ND |
| 2018-11-16 | ND |
| 2018-12-12 | ND |
| 2018-12-12 | ND |
| 2019-02-07 | ND |
| 2019-04-17 | ND |
| 2019-09-16 | ND |
| 2019-09-16 | ND |
| 2019-11-05 | ND |
| 2019-11-25 | ND |
| 2019-12-11 | ND |
| 2019-12-11 | ND |