Know Your Environment. Protect Your Health.

Simazine

City of Idaho Falls

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND10ND
2021ND80ND
2022ND20ND
2023N/A00N/A

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
2018-09-18SB18091727001ND
2018-10-10SB18101095001ND
2019-03-25SB19032049001ND
2019-04-16SB19041514001ND
2020-07-08SB20070749001ND
2021-06-22SB21062273001ND
2021-06-22SB21062273002ND
2021-06-23SB21062273004ND
2021-06-23SB21062273003ND
2021-07-26SB21072236002ND
2021-07-26SB21072236003ND
2021-07-26SB21072236004ND
2021-07-26SB21072236001ND
2022-06-21SB22062040001ND
2022-06-21SB22062040002ND