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EWG's Tap Water Database — 2019 UPDATE

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Simazine

City of Houston

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.

 

166

Samples

0

Samples exceeding legal limit (MCL)

34

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0337 ppb4111ND - 0.290 ppb
20130.0935 ppb2317ND - 0.170 ppb
20140.00643 ppb141ND - 0.0900 ppb
20150.0250 ppb366ND - 0.230 ppb
20160.0200 ppb265ND - 0.130 ppb
20170.0454 ppb267ND - 0.200 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
2012-01-31AB79849ND
2012-01-31AB798520.0800 ppb
2012-01-31AB79850ND
2012-01-31AB79847ND
2012-01-31AB79851ND
2012-02-01AB798440.130 ppb
2012-02-01AB798430.130 ppb
2012-02-01AB798460.0700 ppb
2012-02-01AB798450.290 ppb
2012-04-10AB86429ND
2012-04-10AB86427ND
2012-04-10AB86430ND
2012-04-10AB86428ND
2012-04-10AB86431ND
2012-05-23AB90945ND
2012-05-23AB90946ND
2012-05-23AB90939ND
2012-05-23AB90943ND
2012-05-23AB90942ND
2012-05-23AB90944ND
2012-06-11AB922170.160 ppb
2012-06-12AB92383ND
2012-06-12AB92386ND
2012-06-12AB92384ND
2012-07-24AB96072ND
2012-07-24AB96069ND
2012-07-24AB96067ND
2012-07-24AB96071ND
2012-07-24AB96070ND
2012-07-24AB96066ND
2012-07-24AB96068ND
2012-07-24AB96065ND
2012-11-08AC049260.1000 ppb
2012-11-08AC049240.110 ppb
2012-11-08AC049280.110 ppb
2012-11-08AC049250.110 ppb
2012-11-19AC05465ND
2012-11-19AC05463ND
2012-11-19AC05461ND
2012-11-19AC05464ND
2012-11-19AC054620.0900 ppb
2013-02-25AC116270.130 ppb
2013-02-25AC116240.130 ppb
2013-02-25AC116300.130 ppb
2013-02-25AC116280.120 ppb
2013-02-25AC116290.130 ppb
2013-02-26AC118490.110 ppb
2013-03-11AC129650.110 ppb
2013-03-11AC129680.1000 ppb
2013-03-11AC129660.0900 ppb
2013-03-11AC129690.0900 ppb
2013-06-12AC221410.170 ppb
2013-06-12AC221400.160 ppb
2013-06-12AC221380.160 ppb
2013-06-13AC221460.120 ppb
2013-06-13AC221390.130 ppb
2013-08-08AC27277ND
2013-08-08AC27276ND
2013-08-08AC27278ND
2013-08-08AC27274ND
2013-08-08AC272750.140 ppb
2013-10-24AC33318ND
2013-12-16AC376950.130 ppb
2013-12-17AC37823ND
2014-02-03AC41128ND
2014-03-14AC47183ND
2014-03-14AC47184ND
2014-03-14AC47185ND
2014-04-16AC50928ND
2014-04-16AC509290.0900 ppb
2014-04-17AC51177ND
2014-06-03AC55831ND
2014-06-03AC55826ND
2014-07-15AC59733ND
2014-07-15AC59729ND
2014-10-08AC69250ND
2014-12-18AC75488ND
2014-12-18AC75489ND
2015-03-04AC83061ND
2015-03-04AC83059ND
2015-03-05AC83064ND
2015-03-05AC83065ND
2015-03-24AC85944ND
2015-06-04AC94707ND
2015-06-04AC94705ND
2015-06-04AC94710ND
2015-06-04AC94709ND
2015-06-04AC94706ND
2015-06-04AC94708ND
2015-07-22AD00679ND
2015-07-22AD00678ND
2015-09-17AD076490.0800 ppb
2015-09-17AD07648ND
2015-10-22AD11601ND
2015-10-22AD11600ND
2015-10-22AD11602ND
2015-10-22AD11596ND
2015-10-22AD11599ND
2015-10-22AD11598ND
2015-10-22AD11597ND
2015-11-12AD13457ND
2015-11-12AD13444ND
2015-11-12AD13456ND
2015-11-12AD13453ND
2015-11-12AD134430.230 ppb
2015-11-12AD13452ND
2015-11-12AD13455ND
2015-11-12AD134540.220 ppb
2015-11-16AD136990.1000 ppb
2015-11-16AD137010.120 ppb
2015-11-16AD137000.150 ppb
2015-11-17AD13907ND
2015-12-08AD16048ND
2015-12-08AD16049ND
2016-03-03AD270140.130 ppb
2016-03-16AD292230.110 ppb
2016-03-16AD292220.120 ppb
2016-03-17AD294320.0900 ppb
2016-03-17AD29430ND
2016-03-17AD29435ND
2016-03-17AD294330.0700 ppb
2016-03-23AD30249ND
2016-03-23AD30250ND
2016-03-23AD30248ND
2016-03-23AD30251ND
2016-06-08AD39863ND
2016-06-08AD39861ND
2016-06-08AD39862ND
2016-06-08AD39860ND
2016-06-15AD40829ND
2016-06-16AD41041ND
2016-06-16AD41042ND
2016-09-20AD50459ND
2016-09-20AD50460ND
2016-09-21AD50889ND
2016-09-21AD50890ND
2016-10-06AD52704ND
2016-10-06AD52706ND
2016-10-06AD52705ND
2016-12-02AD60483ND
2017-01-26AD67327ND
2017-01-26AD67326ND
2017-02-28AD726140.200 ppb
2017-02-28AD726150.180 ppb
2017-03-01AD728830.190 ppb
2017-03-01AD728820.190 ppb
2017-03-02AD732830.0900 ppb
2017-03-02AD73284ND
2017-03-28AD77273ND
2017-03-28AD772740.200 ppb
2017-04-27AD81596ND
2017-04-27AD81598ND
2017-04-27AD81597ND
2017-07-06AD88548ND
2017-07-06AD88549ND
2017-07-25AD906750.130 ppb
2017-07-26AD90935ND
2017-07-26AD90934ND
2017-09-11AD95633ND
2017-09-11AD95634ND
2017-09-26AD98128ND
2017-09-26AD98129ND
2017-09-26AD98130ND
2017-11-07AE03932ND
2017-11-07AE03938ND
2017-12-04AE06640ND