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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Centennial Water and Sanitation District

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND40ND
2014ND20ND
2015ND40ND
2016ND60ND
2017ND60ND

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 Result
2012-03-19ND
2012-08-22ND
2012-08-23ND
2012-10-16ND
2012-10-31ND
2013-03-19ND
2013-03-19ND
2013-06-12ND
2013-08-27ND
2014-07-23ND
2014-07-29ND
2015-05-20ND
2015-07-27ND
2015-08-12ND
2015-08-12ND
2016-05-17ND
2016-07-27ND
2016-07-27ND
2016-08-17ND
2016-10-10ND
2016-10-10ND
2017-01-25ND
2017-01-25ND
2017-06-14ND
2017-08-15ND
2017-08-17ND
2017-08-17ND