Know Your Environment. Protect Your Health.

Simazine

Utrwd Regional Water Treatment Plant

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0325 ppb41ND - 0.130 ppb
20190.0500 ppb52ND - 0.180 ppb
20200.0300 ppb52ND - 0.0800 ppb
20210.0180 ppb51ND - 0.0900 ppb
2022ND50ND
20230.0296 ppb52ND - 0.0800 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
2018-02-13Q1805957001ND
2018-06-05Q18223190010.130 ppb
2018-09-13Q1836570003ND
2018-09-25Q1838256001ND
2019-03-07Q19099100070.180 ppb
2019-06-24Q19395740010.0700 ppb
2019-09-26Q1969362001ND
2019-10-02Q1971112001ND
2019-12-18Q1980808001ND
2020-03-09Q20084480010.0800 ppb
2020-05-20Q20200890010.0700 ppb
2020-08-18Q2032859001ND
2020-08-18Q2032859006ND
2020-11-04Q2042753001ND
2021-02-23Q21045960010.0900 ppb
2021-06-22Q2116334001ND
2021-09-27Q2126305001ND
2021-09-27Q2126305002ND
2021-11-12Q2131799001ND
2022-01-25Q2202436001ND
2022-06-21Q2217160002ND
2022-09-15Q2227673007ND
2022-09-15Q2227673008ND
2022-11-22Q2235058001ND
2023-03-07Q2308901002ND
2023-06-13Q23224870010.0800 ppb
2023-08-02Q2331445005ND
2023-08-02Q2331445006ND
2023-11-10Q23483070010.0680 ppb