Know Your Environment. Protect Your Health.

Simazine

Morgan City 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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
20200.0400 ppb21ND - 0.0800 ppb
20210.0595 ppb220.0580 ppb - 0.0610 ppb
20220.0335 ppb21ND - 0.0670 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
2018-05-0335390205001ND
2018-05-0335390205001ND
2018-07-2335406291001ND
2018-07-2335406291001ND
2019-01-2935445061001ND
2019-01-2935445061001ND
2019-07-2435484849001ND
2019-07-2435484849001ND
2020-02-04355286460010.0800 ppb
2020-10-1535585524001ND
2021-03-25356217760010.0610 ppb
2021-11-30356809030010.0580 ppb
2022-03-24357060930010.0670 ppb
2022-08-2535742735001ND
2023-02-2735782420001ND
2023-10-2335836723001ND