Know Your Environment. Protect Your Health.

Simazine

City of Shavano Park

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
2018ND10ND
2019ND30ND
2020ND20ND
2021ND10ND
2022ND50ND
2023ND30ND

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
2018-03-02AE16783ND
2019-04-03AE61106ND
2019-04-03AE61107ND
2019-04-03AE61108ND
2020-02-24AE99608ND
2020-05-15AF11951ND
2021-02-23AF44017ND
2022-03-09AF88498ND
2022-03-09AF88499ND
2022-03-09AF88501ND
2022-06-21AG01786ND
2022-09-27AG15096ND
2023-03-16AG33423ND
2023-06-22AG45704ND
2023-06-22AG45705ND