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EWG's Tap Water Database — 2021 UPDATE

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Simazine

City of Morgan Hill

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.

MORE ABOUT THIS CONTAMINANT

 

41

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND80ND
2015ND20ND
2016ND120ND
2017ND60ND
2018ND10ND
2019ND120ND

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
2014-05-125810-032-0920ND
2014-05-125810-017-1015ND
2014-05-285810-012-0930ND
2014-06-235810-010-0815ND
2014-09-105810-032-1020ND
2014-09-105810-017-0950ND
2014-09-105810-010-0920ND
2014-09-105810-012-0845ND
2015-05-185810-002-0900ND
2015-07-211610-001-1010ND
2016-05-091610-008-0815ND
2016-05-091610-009-0900ND
2016-05-091610-016-0730ND
2016-05-091610-015-0930ND
2016-05-161610-043-0740ND
2016-05-161610-040-0830ND
2016-08-221610-015-1000ND
2016-08-221610-016-0900ND
2016-08-221610-009-0930ND
2016-08-221610-008-0830ND
2016-08-221610-040-0800ND
2016-08-221610-043-0730ND
2017-05-085867-017-0900ND
2017-05-085867-032-0800ND
2017-05-221610-012-0720ND
2017-08-141610-012-0900ND
2017-08-141610-017-0830ND
2017-08-141610-032-0800ND
2018-10-301610-001-0930ND
2019-05-071610-040-0715ND
2019-05-071610-043-0630ND
2019-05-071610-016-0930ND
2019-05-071610-015-0830ND
2019-05-071610-009-0800ND
2019-05-071610-008-1000ND
2019-09-101610-040-1000ND
2019-09-101610-043-0940ND
2019-09-101610-016-0900ND
2019-09-101610-015-0800ND
2019-09-101610-009-0730ND
2019-09-101610-008-0830ND