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EWG's Tap Water Database — 2021 UPDATE

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Simazine

Boone County Cons. PWSD1

Simazine is a hormone-disrupting herbicide related to atrazine. It affects the male and female reproductive systems. In studies of laboratory animals, simazine increases blood levels of estrogen, decreases prolactin and progesterone, and causes mammary and ovarian tumors.

MORE ABOUT THIS CONTAMINANT

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018ND180ND
2019ND40ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for simazine was defined by EWG based on epidemiological studies of human exposure to atrazine in drinking water. This health guideline protects against harm to the developing fetus, harm to the reproductive system and hormone disruption.

EPA Maximum Contaminant
Level (MCL) 4 ppb

The legal limit for simazine, established in 1992, was based on toxicity studies in laboratory animals conducted in the 1980s. This limit does not fully protect against harm to the reproductive system, harm to the developing fetus, and hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-07AD14744ND
2018-03-07AD14754ND
2018-03-07AD14753ND
2018-03-07AD14752ND
2018-03-07AD14751ND
2018-03-07AD14749ND
2018-03-07AD14746ND
2018-03-07AD14743ND
2018-03-07AD14747ND
2018-03-07AD14750ND
2018-03-07AD14745ND
2018-03-07AD14741ND
2018-03-16AD17714ND
2018-03-16AD17715ND
2018-04-11AD18403ND
2018-05-21AD20840ND
2018-08-21AD31542ND
2018-11-19AD36040ND
2019-02-08AD39831ND
2019-05-21AD47807ND
2019-08-22AD54307ND
2019-11-21AD58314ND