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EWG's Tap Water Database — 2021 UPDATE

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Simazine

Chino Basin Desalter Authority - Desalter 2

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

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND180ND
2016ND10ND
2017ND10ND
2018ND220ND
2019ND10ND

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
2014-01-224790-008-1010ND
2014-01-224790-001-1055ND
2015-01-224790-002-1035ND
2015-01-224790-005-0945ND
2015-01-284790-001-1210ND
2015-01-284790-010-0950ND
2015-01-284790-009-1050ND
2015-01-284790-003-0940ND
2015-01-284790-004-1045ND
2015-04-214790-001-1225ND
2015-04-214790-010-0905ND
2015-04-214790-009-1133ND
2015-04-214790-005-1125ND
2015-04-214790-004-1020ND
2015-04-214790-003-0905ND
2015-04-214790-002-1030ND
2015-05-204790-007-1045ND
2015-08-124790-007-1200ND
2015-08-134790-008-0900ND
2015-11-054790-008-1005ND
2016-01-204790-001-1125ND
2017-01-185810-001-1110ND
2018-01-104790-008-1030ND
2018-01-104790-010-0900ND
2018-01-104790-009-1145ND
2018-01-179588-007-0920ND
2018-01-179588-003-1050ND
2018-01-179588-005-1145ND
2018-01-179588-004-0910ND
2018-01-179588-002-1150ND
2018-01-179588-001-1045ND
2018-03-284790-016-1000ND
2018-03-284790-015-0905ND
2018-04-104790-007-1040ND
2018-04-104790-010-0945ND
2018-04-104790-009-1155ND
2018-04-104790-008-0830ND
2018-04-114790-001-1030ND
2018-04-114790-004-1130ND
2018-04-114790-002-0845ND
2018-04-114790-003-1030ND
2018-04-114790-005-0845ND
2018-06-224790-015-1030ND
2018-06-224790-016-0850ND
2019-02-124790-001-1030ND