Know Your Environment. Protect Your Health.

2,4-D

Regional Water Authority

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.

 

78

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND260ND
2020ND40ND
2021ND40ND
2022ND360ND
2023ND40ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-05SOCR 200489130ND
2018-03-05SOCR 200489131ND
2018-03-05SOCR 200489152ND
2018-11-29SOCR 200514127ND
2019-03-04SOCR 200523153ND
2019-03-04SOCR 200523178ND
2019-03-04SOCR 200523152ND
2019-03-04SOCR 200523177ND
2019-05-08SOC 200531300ND
2019-05-28SOC 200533720ND
2019-05-28SOC 200533719ND
2019-05-28SOC 200533803ND
2019-05-28SOC 200533804ND
2019-05-28SOC 200533660ND
2019-05-28SOC 200533659ND
2019-05-29SOC 200533881ND
2019-05-29SOC 200533880ND
2019-05-29SOC 200533867ND
2019-05-29SOC 200533868ND
2019-08-26SOC 200546200ND
2019-08-26SOC 200546197ND
2019-08-26SOC 200546198ND
2019-08-27SOC 200546267ND
2019-08-27SOC 200546268ND
2019-08-27SOC 200546302ND
2019-08-27SOC 200546303ND
2019-08-28SOC 200546738ND
2019-08-28SOC 200546737ND
2019-08-28SOC 200546736ND
2019-08-28SOC 200546553ND
2020-03-02SOCR 200567667ND
2020-03-02SOCR 200567641ND
2020-03-02SOCR 200567666ND
2020-03-02SOCR 200567642ND
2021-03-08SOCR 200608803ND
2021-03-08SOCR 200608888ND
2021-03-08SOCR 200608887ND
2021-03-09SOCR 200608923ND
2022-03-07H300153409 300153415ND
2022-03-07H300153416 300153418ND
2022-03-07H300153331 300153333ND
2022-03-07H300153334 300153336ND
2022-07-11S300210822 300210823ND
2022-07-11S300210156 300210157ND
2022-07-11S300210164 300210165ND
2022-07-11S300210651 300210652ND
2022-07-11S300210659 300210660ND
2022-07-12S300211086 300211087ND
2022-07-12S300211068 300211069ND
2022-07-12S300211076 300211077ND
2022-07-13S300212413 300212414ND
2022-07-13S300212421 300212422ND
2022-07-14S300212957 300212958ND
2022-10-17S300258850 300258851ND
2022-10-17300258850 300258851BND
2022-10-17300258858 300258859BND
2022-10-17S300258858 300258859ND
2022-10-18S300258921 300258922ND
2022-10-18300258921 300258922BND
2022-10-18300259350 300259351BND
2022-10-18300259358 300259359BND
2022-10-18S300259350 300259351ND
2022-10-18300258913 300258914BND
2022-10-18S300258913 300258914ND
2022-10-18S300259358 300259359ND
2022-10-19S300260499 300260500ND
2022-10-19S300260507 300260508ND
2022-10-19300260507 300260508BND
2022-10-19300260499 300260500BND
2022-10-19S300259940 300259941ND
2022-10-19300259940 300259941BND
2022-10-19300259930 300259933BND
2022-10-19S300259930 300259933ND
2022-12-06S300281400 300281401ND
2023-04-10H300330392 300330394ND
2023-04-10H300329920 300329922ND
2023-04-10H300330395 300330397ND
2023-04-10H300329917 300329919ND