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EWG's Tap Water Database — 2019 UPDATE

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Simazine

City of Grand Prairie

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.157 ppb63ND - 0.340 ppb
20130.420 ppb330.180 ppb - 0.540 ppb
20140.0740 ppb53ND - 0.190 ppb
20150.0470 ppb101ND - 0.470 ppb
2016ND60ND
20170.148 ppb52ND - 0.640 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
2012-03-0712032550040.300 ppb
2012-03-0712032550050.300 ppb
2012-03-0712032550030.340 ppb
2012-08-131208543009ND
2012-08-131208543008ND
2012-08-131208543007ND
2013-02-1913025710040.540 ppb
2013-02-1913025710030.540 ppb
2013-04-291304A100060.180 ppb
2014-04-23Q14129910030.190 ppb
2014-06-04Q14193310030.0700 ppb
2014-06-26Q1424023042ND
2014-06-26Q14240230070.110 ppb
2014-09-10Q1442991006ND
2015-03-11Q15090640030.470 ppb
2015-06-09Q1521042002ND
2015-06-09Q1521042001ND
2015-07-14Q1526936013ND
2015-07-14Q1526936012ND
2015-07-14Q1526936011ND
2015-07-14Q1526936010ND
2015-07-14Q1526936009ND
2015-10-07Q1539391002ND
2015-10-07Q1539391001ND
2016-01-14Q1601729002ND
2016-01-14Q1601729001ND
2016-03-01Q1608611001ND
2016-04-06Q1613635009ND
2016-07-14Q1628712003ND
2016-12-05Q1652555003ND
2017-01-05Q17006320030.640 ppb
2017-01-05Q17006320170.1000 ppb
2017-06-27Q1726535026ND
2017-06-27Q1726535025ND
2017-06-27Q1726535001ND