Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Simazine

Three Valleys Municipal Water 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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND50ND
2014ND40ND
2015ND20ND
2016ND50ND
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 Lab ID Result
2012-04-173761-002-1100ND
2012-05-153761-002-1100ND
2012-06-133761-004-1200ND
2012-06-133761-002-0945ND
2012-09-119588-004-0800ND
2012-09-119588-002-0000ND
2013-03-053761-002-1040ND
2013-06-113761-002-0830ND
2013-06-253761-004-0930ND
2013-09-173761-002-0000ND
2013-12-173761-002-1000ND
2014-05-133761-004-1000ND
2014-05-133761-002-1034ND
2014-06-103761-004-1030ND
2014-09-163761-004-1101ND
2015-03-103761-002-0930ND
2015-06-093761-004-0940ND
2016-03-153761-002-0900ND
2016-06-213761-004-1006ND
2016-06-213761-002-1030ND
2016-09-133761-002-1000ND
2016-12-133761-002-1020ND
2017-03-213761-004-1040ND
2017-05-163761-004-0900ND
2017-05-163761-002-0800ND
2017-06-213761-004-1100ND
2017-06-213761-002-1000ND
2017-09-123761-002-0900ND