Know Your Environment. Protect Your Health.

Simazine

Metropolitan Utilities 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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND110ND
2019ND40ND
2020ND70ND
2021ND50ND
2022ND20ND
2023ND60ND

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
2018-04-24543626ND
2018-04-24543624ND
2018-04-24543625ND
2018-06-05545300ND
2018-06-05545301ND
2018-06-05545297ND
2018-07-16560974ND
2018-08-28561295ND
2018-08-28561294ND
2018-08-28561296ND
2018-08-28561293ND
2019-04-29604249ND
2019-04-29604247ND
2019-04-29604248ND
2019-07-22621275ND
2020-04-20668338ND
2020-04-20668339ND
2020-04-20668337ND
2020-05-18676337ND
2020-05-18676349ND
2020-05-18676350ND
2020-08-03684325ND
2021-04-07727697ND
2021-04-07727698ND
2021-08-04753934ND
2021-08-04753930ND
2021-08-04746189ND
2022-04-19791724ND
2022-04-19791723ND
2023-01-17844826ND
2023-04-05855572ND
2023-04-05855571ND
2023-05-22856265ND
2023-07-25873789ND
2023-08-22874404ND