Know Your Environment. Protect Your Health.

Simazine

MO American Garden City

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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
2018-02-12AD14795ND
2018-05-09AD20798ND
2018-08-15AD31572ND
2018-11-14AD36081ND
2019-02-25AD39883ND
2019-05-22AD47765ND
2019-08-28AD54357ND
2019-11-20AD58382ND
2020-02-262001260ND
2020-05-202008589ND
2020-09-292012931ND
2020-11-192017769ND
2021-02-242100389ND
2021-05-242110659ND
2021-08-242115008ND
2021-11-112119252ND
2022-02-1557863801ND
2022-05-1958463201ND
2022-08-1860055301ND
2022-11-0160788101ND
2023-02-1562122201ND
2023-05-2463179601ND
2023-08-0267182001ND
2023-11-0768390601ND