2,4-D
Castaic Lake Water Agency
2,4-D (2,4-dichlorophenoxyacetic acid) is a herbicide that can be applied directly to GMO corn and soy plants engineered to withstand this toxic chemical. Americans' exposures to 2,4-D from food and drinking water will likely increase in years to come as farmers plant more of these GMO crops. Read More.
2,4-D is an endocrine disruptor that interferes with thyroid hormones. The International Agency for Research on Cancer classifies 2,4-D as possibly carcinogenic to humans. In occupational studies, farmers exposed to 2,4-D tended to have higher incidences of damaged and malformed sperm. Laboratory animals exposed to 2,4-D during gestation are born underdeveloped and are more likely to have birth defects.
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 | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 20 ppb
The EWG Health Guideline of 20 ppb for 2,4-D 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 internal organs.
EPA Maximum Contaminant
Level (MCL) 70 ppb
The legal limit for 2,4-D, established in 1991, was based on toxicity studies in laboratory animals conducted in the 1980s. This limit may not fully protect against harm to the nervous system, harm to the thyroid, and hormone disruption.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-07-30 | 9588-006-0930 | ND |
| 2014-07-30 | 9588-005-0830 | ND |
| 2014-11-21 | 9588-004-1155 | ND |
| 2014-11-25 | 9588-005-1345 | ND |
| 2015-01-14 | 9588-004-1220 | ND |
| 2015-07-23 | 9590-004-0750 | ND |
| 2015-07-23 | 9590-006-0940 | ND |
| 2015-07-23 | 9590-005-0840 | ND |
| 2016-07-20 | 9590-005-1115 | ND |
| 2016-07-20 | 9590-006-1215 | ND |
| 2016-07-20 | 9590-004-1035 | ND |
| 2017-07-26 | 9590-005-1300 | ND |
| 2017-07-26 | 9590-006-1405 | ND |
| 2017-07-26 | 9590-004-1140 | ND |
| 2017-11-15 | 9590-005-1115 | ND |
| 2018-07-25 | 9590-005-1310 | ND |
| 2018-07-25 | 9590-006-1350 | ND |
| 2018-07-25 | 9590-004-1230 | ND |
| 2018-10-11 | 9590-004-1010 | ND |
| 2019-07-31 | 9590-005-1040 | ND |
| 2019-07-31 | 9590-004-1000 | ND |
| 2019-07-31 | 9590-006-1125 | ND |