Know Your Environment. Protect Your Health.

Simazine

Natchitoches 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
2020ND20ND
2021ND20ND
2022ND20ND
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
2018-01-2235370029001ND
2018-01-2235370029001ND
2018-07-3135408508001ND
2018-07-3135408508001ND
2019-02-2535450970001ND
2019-02-2535450970001ND
2019-08-0735490086001ND
2019-08-0735490086001ND
2020-02-1735531798001ND
2020-09-1735578824001ND
2021-01-2035606276001ND
2021-08-1835657244006ND
2022-01-2635693462007ND
2022-08-0835738986005ND
2023-03-0635784946004ND
2023-08-2235823297001ND