Know Your Environment. Protect Your Health.

Simazine

Lafourche Water District 1

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND80ND
20200.160 ppb82ND - 1.20 ppb
20210.0464 ppb53ND - 0.0800 ppb
2022ND40ND
2023ND40ND

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
2018-02-2635377894001ND
2018-02-2635377894001ND
2018-07-2335406305001ND
2018-07-2335406305001ND
2018-08-2335413196001ND
2018-08-2335413196001ND
2019-01-2935445082001ND
2019-01-2935445082001ND
2019-02-1835449374001ND
2019-02-1835449374001ND
2019-07-2435484855001ND
2019-07-2435484855001ND
2019-08-2835494052001ND
2019-08-2835494052001ND
2020-01-22355260130020.0800 ppb
2020-01-2235526013001ND
2020-02-2635533604002ND
2020-02-2635533604001ND
2020-07-2435567568001ND
2020-07-2435567566001ND
2020-10-1535585520001ND
2020-12-03355964680011.20 ppb
2021-01-14356051160020.0800 ppb
2021-03-11356192760010.0790 ppb
2021-03-11356192850010.0730 ppb
2021-11-0435675774001ND
2021-12-1635685695001ND
2022-03-0235701429001ND
2022-03-0235701432001ND
2022-08-2535742731001ND
2022-10-1235753130001ND
2023-02-2735782418001ND
2023-03-2735789305001ND
2023-10-2335836721001ND
2023-12-2135849979001ND