Know Your Environment. Protect Your Health.

Simazine

Cross Timbers Water Supply Corporation

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)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
20190.210 ppb110.210 ppb
2020ND20ND
2021ND50ND
2022ND30ND
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
2018-01-11Q1801616006ND
2018-01-11Q1801616005ND
2018-04-11Q1815188003ND
2018-12-05Q1849636004ND
2019-03-07Q19099090030.210 ppb
2020-05-18Q2019652005ND
2020-10-12Q2039719003ND
2021-08-30Q2123513002ND
2021-08-30Q2123513004ND
2021-08-30Q2123513003ND
2021-08-30Q2123513001ND
2021-11-08Q2131371001ND
2022-02-17Q2205965001ND
2022-05-02Q2212894001ND
2022-09-22Q2228542002ND
2023-03-02Q2308488008ND
2023-03-02Q2308488009ND