Know Your Environment. Protect Your Health.

Simazine

Thibodaux Waterworks

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
20200.0233 ppb31ND - 0.0700 ppb
20210.0475 ppb21ND - 0.0950 ppb
2022ND20ND
2023ND20ND

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
2018-01-2535370415010ND
2018-01-2535370415010ND
2018-07-2335406292001ND
2018-07-2335406292001ND
2019-01-2935445087001ND
2019-01-2935445087001ND
2019-07-2435484852001ND
2019-07-2435484852001ND
2020-01-22355260140010.0700 ppb
2020-02-2635533608001ND
2020-10-1535585521001ND
2021-03-11356192840010.0950 ppb
2021-11-0435675780001ND
2022-02-1035696479001ND
2022-08-2535742733001ND
2023-02-2735782421001ND
2023-10-2335836722001ND