Know Your Environment. Protect Your Health.

Simazine

Schriever Water Treatment Service Area

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
20200.0600 ppb21ND - 0.120 ppb
20210.0365 ppb21ND - 0.0730 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
2018-02-2635377894003ND
2018-02-2635377894003ND
2018-08-2835414104001ND
2018-08-2835414104001ND
2019-02-1835449369001ND
2019-02-1835449369001ND
2019-08-2835494055001ND
2019-08-2835494055001ND
2020-01-2235526017001ND
2020-12-03355964650010.120 ppb
2021-03-11356192860010.0730 ppb
2021-11-0435676092001ND
2022-03-0235701431001ND
2022-10-1235753131001ND
2023-03-2735789301002ND
2023-12-1435848534001ND