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EWG's Tap Water Database — 2021 UPDATE

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2,4-D

Prescott Valley WD Upper

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.

MORE ABOUT THIS CONTAMINANT

 

61

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND200ND
2017N/A00N/A
2018ND30ND
2019ND380ND

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
2016-02-09201602100059SCND
2016-02-09201602100059SBND
2016-02-09201602100059SAND
2016-02-10201602110043SCND
2016-02-10201602110043SBND
2016-02-10201602110043SAND
2016-02-10201602110037SDND
2016-02-10201602110037SCND
2016-02-10201602110037SBND
2016-02-10201602110037SAND
2016-08-03201608040057SAND
2016-08-03201608040057SBND
2016-08-03201608040057SCND
2016-08-03201608040057SEND
2016-08-03201608040057SDND
2016-08-04201608050126SEND
2016-08-04201608050126SDND
2016-08-04201608050126SCND
2016-08-04201608050126SBND
2016-08-04201608050126SAND
2018-05-09201805100262SND
2018-07-25201807250680SND
2018-10-11201810120161SND
2019-02-05201902060089SAND
2019-02-05201902060093SDND
2019-02-05201902060093SCND
2019-02-05201902060093SBND
2019-02-05201902060093SAND
2019-02-05201902060089SDND
2019-02-05201902060089SCND
2019-02-05201902060089SBND
2019-02-06201902070503SDND
2019-02-06201902070503SCND
2019-02-06201902070503SBND
2019-02-06201902070503SAND
2019-02-06201902070498SDND
2019-02-06201902070498SCND
2019-02-06201902070498SBND
2019-02-06201902070498SAND
2019-05-07201905080093SCND
2019-05-07201905080093SAND
2019-05-07201905080093SBND
2019-05-07201905080093SDND
2019-05-07201905080093SEND
2019-05-07201905080096SBND
2019-05-07201905080096SCND
2019-05-07201905080096SDND
2019-05-07201905080096SAND
2019-05-08201905090402SDND
2019-05-08201905090402SAND
2019-05-08201905090402SBND
2019-05-08201905090402SCND
2019-05-08201905090408SAND
2019-05-08201905090408SBND
2019-05-08201905090408SCND
2019-06-1919F2188-01ND
2019-08-2819H3349-01ND
2019-08-2819H3342-01ND
2019-09-1619I1769-05ND
2019-11-2019K2301-01ND
2019-11-2019K2302-01ND