Know Your Environment. Protect Your Health.

Simazine

Cooper County Consolidated Public Water Supply District # 1

NOTE: Cooper County Consolidated Public Water Supply District # 1 purchases water from Boonville PWS which is required to test for simazine. Sample information shown below was taken by Boonville PWS.

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND40ND
2020ND40ND
2021ND40ND
2022ND40ND
2023ND30ND

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

NOTE: Cooper County Consolidated Public Water Supply District # 1 purchases water from Boonville PWS which is required to test for simazine. Sample information shown below was taken by Boonville PWS.

Date Lab ID Result
2018-02-27AD148340.430 ppb
2018-05-23AD20839ND
2018-08-22AD31540ND
2018-11-29AD36120ND
2019-03-08AD39922ND
2019-05-21AD47806ND
2019-08-28AD54394ND
2019-11-20AD58419ND
2020-02-242001431ND
2020-05-272008890ND
2020-08-192013087ND
2020-12-092018026ND
2021-02-232100660ND
2021-05-262110934ND
2021-08-232115277ND
2021-11-232119511ND
2022-02-222201954ND
2022-05-232211549ND
2022-09-132216237ND
2022-11-282221165ND
2023-02-232300575ND
2023-05-222308124ND
2023-09-192313319ND