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EWG's Tap Water Database — 2021 UPDATE

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Simazine

Southern California Edison Company-Santa Catalina

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND230ND
2015N/A00N/A
2016N/A00N/A
2017ND50ND
2018ND150ND
2019N/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
2014-01-029588-041-1145ND
2014-03-139588-041-1030ND
2014-03-149588-006-1050ND
2014-03-149588-005-1108ND
2014-03-149588-016-1010ND
2014-03-189588-019-0950ND
2014-03-189588-012-1415ND
2014-03-189588-014-1158ND
2014-03-189588-020-1038ND
2014-03-189588-030-1224ND
2014-03-189588-031-1232ND
2014-06-199588-041-1115ND
2014-07-109588-012-1030ND
2014-07-179588-020-1425ND
2014-07-179588-019-1250ND
2014-07-189588-016-1130ND
2014-07-189588-023-1100ND
2014-07-189588-012-1255ND
2014-07-189588-030-1215ND
2014-07-189588-006-1100ND
2014-07-219588-014-1130ND
2014-10-229588-012-1100ND
2014-11-049588-005-1108ND
2017-05-189588-023-1100ND
2017-09-259588-006-1330ND
2017-09-259588-023-1100ND
2017-09-269588-020-1015ND
2017-09-269588-019-0920ND
2018-03-199588-006-1200ND
2018-03-199588-012-1130ND
2018-03-209588-005-1300ND
2018-03-209588-031-1030ND
2018-03-209588-016-1040ND
2018-06-229588-005-1240ND
2018-06-229588-006-1215ND
2018-06-259588-016-1210ND
2018-06-259588-014-1120ND
2018-06-259588-019-1030ND
2018-06-259588-020-1200ND
2018-06-259588-023-1030ND
2018-06-259588-030-1120ND
2018-06-259588-031-1220ND
2018-06-269588-012-1100ND