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EWG's Tap Water Database — 2019 UPDATE

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Simazine

St. Louis 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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
20130.247 ppb62ND - 0.940 ppb
2014ND80ND
2015ND80ND
20160.0893 ppb102ND - 0.529 ppb
2017ND80ND

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
2012-02-16CRCW021612M508ND
2012-02-17HBCB021712M508ND
2012-05-09AB71796ND
2012-05-09AB71797ND
2012-05-09HBCB050912M508ND
2012-05-21CRCW052112M508ND
2012-09-25HBCB092512M508ND
2012-09-25CRCW092512M508ND
2012-11-07CRCW110712M508ND
2012-11-07HBCB110712M508ND
2013-03-21CRCW032113M508ND
2013-03-21HBCB032113M5080.540 ppb
2013-05-06AB97904ND
2013-05-06AB97903ND
2013-09-20CRCW092013M5080.940 ppb
2013-09-20HBCB092013M508ND
2014-03-27CRCW032714M508ND
2014-03-27HBCB032714M508ND
2014-06-02AC23739ND
2014-06-02AC23738ND
2014-10-24HBCB102414M508ND
2014-10-29CRCW102914M508ND
2014-12-15HBCB121514M508ND
2014-12-16CRCW121614M508ND
2015-03-17AC44660ND
2015-03-17AC44661ND
2015-06-01AC47107ND
2015-06-01AC47106ND
2015-09-30HBCB093015M508ND
2015-09-30CRCW093015M508ND
2015-12-11HBCB121115M508ND
2015-12-23CRCW122315M508ND
2016-03-31HBCB033116M508ND
2016-03-31CRCW033116M508ND
2016-05-17HBCB051716M5080.529 ppb
2016-05-23CRCW052316M5080.364 ppb
2016-06-06AC75864ND
2016-06-06AC75865ND
2016-07-18CRCW071816M508ND
2016-07-18HBCB071816M508ND
2016-10-25HBCB102516M508ND
2016-10-25CRCW102516M508ND
2017-05-19AC98045ND
2017-05-19AC98044ND
2017-06-21AC99038ND
2017-06-21AC99039ND
2017-09-11AD07442ND
2017-09-11AD07443ND
2017-10-31CRCW103117M508ND
2017-10-31HBCB103117M508ND