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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Galveston County WCID 1

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND30ND
20150.0667 ppb32ND - 0.120 ppb
20160.0600 ppb32ND - 0.0900 ppb
20170.0600 ppb31ND - 0.180 ppb

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
2012-02-01AB79856ND
2012-02-01AB79858ND
2012-02-01AB79854ND
2013-02-05AC09730ND
2013-02-05AC09727ND
2013-02-05AC09731ND
2014-01-30AC40932ND
2014-01-30AC40931ND
2014-01-30AC40930ND
2015-01-15AC765840.120 ppb
2015-01-15AC765860.0800 ppb
2015-01-15AC76585ND
2016-01-26AD201990.0900 ppb
2016-01-26AD201980.0900 ppb
2016-06-27AD41974ND
2017-01-26AD67324ND
2017-01-26AD673230.180 ppb
2017-01-26AD67325ND