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EWG's Tap Water Database — 2021 UPDATE

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Simazine

South Island PSD

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
2014ND120ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019ND100ND

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
2014-02-04AD35237ND
2014-02-04AD35249ND
2014-02-04AD35250ND
2014-02-04AD35231ND
2014-02-10AD35465ND
2014-02-10AD35466ND
2014-02-10AD35467ND
2014-02-10AD35468ND
2014-04-14AD38363ND
2014-04-14AD38374ND
2014-04-14AD38376ND
2014-09-08AD45158ND
2019-09-11AE36990ND
2019-09-11AE37008ND
2019-09-11AE37010ND
2019-09-12AE37131ND
2019-09-17AE37328ND
2019-09-17AE37326ND
2019-09-18AE37423ND
2019-09-18AE37429ND
2019-09-18AE37442ND
2019-12-17AE42015ND