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EWG's Tap Water Database — 2019 UPDATE

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Simazine

City of Caldwell

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND40ND
2014ND40ND
2015ND30ND
2016ND50ND
2017N/A00N/A

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
2013-09-25S1341763ND
2013-09-25S1341762ND
2013-09-25S1341755ND
2013-09-25S1341752ND
2014-02-26S1407039ND
2014-06-18S1422594ND
2014-09-29S1438512ND
2014-11-13S1445335ND
2015-03-10S1509143ND
2015-05-06S1517379ND
2015-09-24S1541055ND
2016-09-06S1640378ND
2016-09-06S1640377ND
2016-09-06S1640376ND
2016-09-06S1640375ND
2016-09-06S1640374ND