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EWG's Tap Water Database — 2019 UPDATE

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Simazine

City of Gilroy

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND180ND
2013N/A00N/A
2014N/A00N/A
2015ND180ND
2016N/A00N/A
2017N/A00N/A

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
2012-05-215810-001-0850ND
2012-05-215810-006-1315ND
2012-05-215810-002-1135ND
2012-05-215810-004-1045ND
2012-05-225810-009-1035ND
2012-05-225810-010-1115ND
2012-05-225810-008-0955ND
2012-05-225810-007-0745ND
2012-05-225810-011-0835ND
2012-08-225810-001-0845ND
2012-08-225810-002-1025ND
2012-08-225810-004-1000ND
2012-08-225810-006-1325ND
2012-08-225810-008-1050ND
2012-08-225810-009-1110ND
2012-08-225810-011-1300ND
2012-08-235810-010-0855ND
2012-08-235810-007-0825ND
2015-05-205810-007-1300ND
2015-05-205810-008-1025ND
2015-05-205810-006-0945ND
2015-05-205810-009-1100ND
2015-05-205810-010-0810ND
2015-05-215810-004-1250ND
2015-05-215810-002-1010ND
2015-05-215810-011-0955ND
2015-05-215810-001-0800ND
2015-08-195810-007-1120ND
2015-08-195810-008-1019ND
2015-08-195810-004-1320ND
2015-08-195810-009-1044ND
2015-08-195810-002-1250ND
2015-08-195810-010-1203ND
2015-08-195810-001-1225ND
2015-08-195810-006-0948ND
2015-08-205810-011-0845ND