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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Monterey Park Water Department

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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
2012-01-113761-081-0800ND
2012-01-113761-038-0855ND
2012-01-113761-013-0835ND
2012-01-113761-010-0905ND
2013-01-083761-081-0900ND
2013-01-083761-038-1030ND
2013-01-083761-013-1015ND
2013-01-083761-010-1015ND
2014-01-153761-081-0915ND
2014-01-153761-038-0725ND
2014-01-153761-013-0820ND
2014-01-153761-010-0810ND
2015-01-133761-081-1226ND
2015-01-133761-038-1155ND
2015-01-133761-013-1205ND
2015-01-133761-010-1145ND
2016-01-043761-081-1130ND
2016-01-043761-038-1010ND
2016-01-043761-013-1020ND
2016-01-043761-010-1000ND
2017-01-109590-081-0835ND
2017-01-109590-038-0930ND
2017-01-109590-013-0950ND
2017-01-109590-010-1035ND