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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Rathbun Regional Water Assn

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND40ND
2014ND10ND
2015N/A00N/A
20160.1000 ppb220.1000 ppb
2017ND10ND

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
2012-03-011889408ND
2012-06-041908164ND
2012-09-101929959ND
2012-12-031948331ND
2013-03-041964755ND
2013-04-091973632ND
2013-06-111984289ND
2013-06-111984288ND
2014-01-072026480ND
2016-04-06OE3630370.1000 ppb
2016-04-06OE3630510.1000 ppb
2017-03-15OE491252ND