Know Your Environment. Protect Your Health.

Simazine

Vivian Water System

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND30ND
2021ND20ND
2022ND10ND
2023ND30ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-01-0835367519001ND
2018-01-0835367519001ND
2018-07-2335407296001ND
2018-07-2335407296001ND
2019-02-1835449625001ND
2019-02-1835449625001ND
2019-07-2535485237001ND
2019-07-2535485237001ND
2020-02-1135530385001ND
2020-08-0435567924001ND
2020-09-3035581641001ND
2021-01-0535602530001ND
2021-08-1035655130001ND
2022-02-1435697796001ND
2023-01-3035776976005ND
2023-08-1535821489001ND
2023-12-1235848285001ND