Know Your Environment. Protect Your Health.

Simazine

Grand Lakes Municipal Utility District 4

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND10ND
2020ND10ND
20210.0175 ppb41ND - 0.0700 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
2018-07-17AE33650ND
2018-07-17AE33654ND
2019-05-07AE65250ND
2020-06-24AF16868ND
2021-06-21AF58958ND
2021-06-21AF58959ND
2021-09-17AF705100.0700 ppb
2021-10-05Q2127459001ND
2022-01-21AF81443ND
2022-01-21AF81444ND
2023-07-20AG49695ND
2023-07-20AG49700ND