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EWG's Tap Water Database — 2019 UPDATE

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Simazine

City of Lewiston

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND30ND
2014N/A00N/A
2015ND60ND
2016ND10ND
2017N/A00N/A

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
2012-04-03S59257ND
2012-10-24S63631ND
2012-10-24S63632ND
2012-10-24S63633ND
2013-02-27S130228026-001ND
2013-08-21S130822058-005ND
2013-08-21S130822058-001ND
2015-01-21S2150122025-001ND
2015-07-22S150723044-001ND
2015-07-22S150723044-002ND
2015-07-22S150723044-003ND
2015-08-19S150819036-001ND
2015-08-19S150819036-002ND
2016-05-16S160518056-001ND