Know Your Environment. Protect Your Health.

Simazine

City of Rio Hondo

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND50ND
2021ND40ND
2022ND40ND
2023ND40ND

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
2018-04-25AE23995ND
2019-02-08AE53919ND
2020-03-06AF01834ND
2020-04-22AF07762ND
2020-06-09AF14684ND
2020-08-19AF24373ND
2020-10-07AF29870ND
2021-01-27AF41418ND
2021-04-29AF52015ND
2021-08-18AF66950ND
2021-12-20Q2135960001ND
2022-02-03AF83527ND
2022-04-19AF93735ND
2022-09-26AG14869ND
2022-11-17AG19240ND
2023-02-01AG27264ND
2023-05-18AG41183ND
2023-08-03AG51413ND
2023-11-09AG63128ND