Know Your Environment. Protect Your Health.

Simazine

Monroe Water System

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND20ND
20210.124 ppb220.0780 ppb - 0.170 ppb
20220.0885 ppb220.0830 ppb - 0.0940 ppb
20230.170 ppb21ND - 0.340 ppb

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
2018-01-1035367821001ND
2018-01-1035367821001ND
2018-07-3035407880001ND
2018-07-3035407880001ND
2019-01-1435442603001ND
2019-01-1435442603001ND
2019-07-3135486743001ND
2019-07-3135486743001ND
2020-01-0635523114001ND
2020-07-1635564002001ND
2021-02-02356088340020.170 ppb
2021-09-23356662400010.0780 ppb
2022-01-18356921120010.0940 ppb
2022-08-15357411760010.0830 ppb
2023-02-06357781770010.340 ppb
2023-07-1835814092001ND