Know Your Environment. Protect Your Health.

Simazine

Bacliff Municipal Utility District

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0250 ppb41ND - 0.1000 ppb
20190.0350 ppb41ND - 0.140 ppb
2020ND40ND
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
2018-02-12AE13394ND
2018-05-23AE27589ND
2018-08-10AE36730ND
2018-11-19AE465400.1000 ppb
2019-02-11AE539260.140 ppb
2019-04-29AE63985ND
2019-08-19AE79413ND
2019-10-25AE87778ND
2020-01-15AE93835ND
2020-04-20AF07312ND
2020-07-27AF20771ND
2020-12-01AF36052ND
2021-03-16AF47108ND
2021-05-17AF54232ND
2021-07-27AF63889ND
2021-11-15Q2131975001ND
2022-02-17AF85641ND
2022-04-11AF92735ND
2022-08-03AG07982ND
2022-11-18AG19494ND
2023-03-23AG33985ND
2023-04-11AG36650ND
2023-08-11AG52484ND
2023-10-06AG58979ND