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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Fremont City

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)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0333 ppb31ND - 0.1000 ppb
20130.0788 ppb660.0640 ppb - 0.120 ppb
20140.0750 ppb65ND - 0.120 ppb
20150.0945 ppb660.0660 ppb - 0.120 ppb
20160.0743 ppb330.0570 ppb - 0.0860 ppb
2017ND30ND

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
2012-04-1112-14075-03ND
2012-05-0912-15295-02ND
2012-06-0612-16544-050.1000 ppb
2013-02-0413-11314-010.120 ppb
2013-04-0113-13943-010.0640 ppb
2013-05-0613-15439-010.0750 ppb
2013-06-0313-16817-01B0.0730 ppb
2013-07-0113-18526-050.0730 ppb
2013-10-0113-23328-010.0680 ppb
2014-02-0414-11372-010.0990 ppb
2014-04-0114-13877-070.120 ppb
2014-05-0514-15302-010.0710 ppb
2014-06-0214-16804-01B0.0600 ppb
2014-07-0114-18617-030.1000 ppb
2014-10-0614-23864-07ND
2015-02-0315-11275-010.0950 ppb
2015-04-0115-13990-010.120 ppb
2015-05-0415-15619-020.0900 ppb
2015-06-0115-17183-01C0.120 ppb
2015-07-0815-19413-010.0760 ppb
2015-10-0515-24452-010.0660 ppb
2016-04-0416-14856-020.0800 ppb
2016-05-0216-16272-010.0570 ppb
2016-06-0616-18161-01C0.0860 ppb
2017-04-0317-15547-01ND
2017-05-0117-17414-01ND
2017-06-0517-19763-01CND