Know Your Environment. Protect Your Health.

Simazine

Tensas Water District Association

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND40ND
2020ND40ND
2021ND40ND
2022ND40ND
2023ND50ND

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
2018-07-3035407878001ND
2018-07-3035407878001ND
2019-01-1435442603003ND
2019-01-1435442603003ND
2019-07-3135486747001ND
2019-07-3135486747001ND
2020-01-0635523112001ND
2020-08-1235570539001ND
2020-09-0935577116001ND
2020-11-1035591783001ND
2021-01-1835605842001ND
2021-05-1335633523002ND
2021-09-1535664394001ND
2021-12-0335682177001ND
2022-01-1835692112003ND
2022-04-1135711946001ND
2022-08-1535741176003ND
2022-12-0735766643001ND
2023-01-1735773661001ND
2023-02-0635778177002ND
2023-04-1235794072001ND
2023-07-1835814093001ND
2023-11-0735841747001ND