Simazine

Union Parish Waterworks 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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	6	ND
2015	N/A	0	N/A
2016	ND	2	ND
2017	ND	4	ND
2018	N/A	0	N/A
2019	ND	6	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-02-10	AD88999	ND
2014-02-10	AD88998	ND
2014-02-10	AD88998	ND
2014-02-10	AD88999	ND
2014-07-15	AD93579	ND
2014-07-15	AD93579	ND
2016-10-19	35272007001	ND
2016-10-19	35272007001	ND
2017-03-14	35301204001	ND
2017-03-14	35301204002	ND
2017-03-14	35301204002	ND
2017-03-14	35301204001	ND
2019-10-07	35504137001	ND
2019-10-07	35504137003	ND
2019-10-07	35504137002	ND
2019-10-07	35504137001	ND
2019-10-07	35504137003	ND
2019-10-07	35504137002	ND