Know Your Environment. Protect Your Health.

Simazine

Kingsbridge Municipal Utility District

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0900 ppb220.0900 ppb
20190.115 ppb220.1000 ppb - 0.130 ppb
20200.0450 ppb21ND - 0.0900 ppb
2021ND20ND
2022ND20ND
20230.110 ppb220.0900 ppb - 0.130 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
2018-04-11AE221230.0900 ppb
2018-04-11AE221240.0900 ppb
2019-01-25AE517920.130 ppb
2019-01-25AE517930.1000 ppb
2020-02-11AE979570.0900 ppb
2020-02-11AE97958ND
2021-01-19AF39884ND
2021-01-19AF39894ND
2022-03-09AF88505ND
2022-03-09AF88510ND
2023-04-12AG366520.0900 ppb
2023-04-12AG366550.130 ppb