Know Your Environment. Protect Your Health.

Simazine

West Jefferson Waterworks District 2

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.200 ppb51ND - 0.500 ppb
20190.700 ppb51ND - 2.50 ppb
2020ND10ND
20210.0250 ppb41ND - 0.1000 ppb
20220.0600 ppb21ND - 0.120 ppb
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
2018-04-1735386954005ND
2018-04-1735386954005ND
2018-06-010.200 ppb*
2018-10-0235421760001ND
2018-10-0235421760001ND
2019-02-0535446731001ND
2019-02-0535446731001ND
2019-06-010.700 ppb*
2019-08-1435490415001ND
2019-08-1435490415001ND
2020-10-2635587646001ND
2021-01-28356080740010.1000 ppb
2021-12-0835683670001ND
2021-12-0935683306001ND
2021-12-0935683322001ND
2022-01-13356907580010.120 ppb
2022-08-0435737248001ND
2023-02-0135777179001ND
2023-10-3135838752001ND

* Sample result is taken from the system's CCR report.