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EWG's Tap Water Database — 2021 UPDATE

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Simazine

San Juan Basin Authority

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.

MORE ABOUT THIS CONTAMINANT

 

75

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND80ND
2016ND80ND
2017ND60ND
2018ND70ND
2019ND300ND

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
2014-08-129590-015-1354ND
2014-08-129590-014-1338ND
2014-08-129590-006-1323ND
2014-08-129590-005-0900ND
2014-08-129590-004-1248ND
2014-08-129590-003-1230ND
2014-09-239590-001-1250ND
2014-09-239590-002-1315ND
2014-11-049590-001-0835ND
2014-11-049590-006-1028ND
2014-11-049590-005-1100ND
2014-11-049590-004-0926ND
2014-11-049590-002-0908ND
2014-11-259590-015-0750ND
2014-11-259590-003-0909ND
2014-11-259590-014-0838ND
2015-08-249590-002-1308ND
2015-08-249590-003-1313ND
2015-08-249590-004-1319ND
2015-08-259590-015-0708ND
2015-08-259590-014-0755ND
2015-08-259590-006-0805ND
2015-08-259590-001-0816ND
2015-08-259590-005-0833ND
2016-02-089590-005-1110ND
2016-02-089590-015-0909ND
2016-02-089590-014-0852ND
2016-02-089590-006-0840ND
2016-02-089590-004-1052ND
2016-02-089590-001-1000ND
2016-02-089590-002-1027ND
2016-02-089590-003-1040ND
2017-02-099590-004-1000ND
2017-02-099590-002-0850ND
2017-02-099590-003-0930ND
2017-06-299590-002-0829ND
2017-08-089590-001-0820ND
2017-08-089590-005-1105ND
2018-02-219590-005-1006ND
2018-02-219590-001-0845ND
2018-08-082920-004-1115ND
2018-08-082920-005-1200ND
2018-08-082920-001-0845ND
2018-08-082920-002-0940ND
2018-08-082920-003-1030ND
2019-01-095810-005-1650ND
2019-01-095810-002-1107ND
2019-01-095810-001-0911ND
2019-01-095810-004-1009ND
2019-01-095810-003-1500ND
2019-03-275810-015-1100ND
2019-03-275810-004-0800ND
2019-03-275810-003-0815ND
2019-03-275810-001-0750ND
2019-03-275810-005-0845ND
2019-04-165810-001-1035ND
2019-04-165810-004-1125ND
2019-04-165810-015-1215ND
2019-04-165810-005-1300ND
2019-04-165810-006-0910ND
2019-04-165810-003-1100ND
2019-07-085810-002-1035ND
2019-07-085810-003-1055ND
2019-07-085810-004-1020ND
2019-07-085810-005-1400ND
2019-07-085810-006-1315ND
2019-07-085810-001-0950ND
2019-07-095810-015-0900ND
2019-10-155810-003-1135ND
2019-10-155810-005-1345ND
2019-10-155810-001-0740ND
2019-10-155810-006-0945ND
2019-10-155810-014-0845ND
2019-10-155810-004-1025ND
2019-10-155810-002-1110ND