Simazine

USMC - 29 Palms

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
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	ND	7	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	ND	11	ND
2019	N/A	0	N/A

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
2015-01-26	4790-013-1140	ND
2015-01-26	4790-004-1330	ND
2015-01-26	4790-011-1450	ND
2015-01-26	4790-005-1200	ND
2015-01-26	4790-010-1245	ND
2015-01-26	4790-001-1100	ND
2015-03-02	4790-003-1100	ND
2018-02-27	4790-007-1320	ND
2018-02-27	4790-013-1120	ND
2018-02-27	4790-006-1255	ND
2018-02-27	4790-005-1200	ND
2018-02-27	4790-004-1230	ND
2018-02-27	4790-003-1100	ND
2018-02-27	4790-001-1140	ND
2018-02-28	4790-008-1145	ND
2018-02-28	4790-009-1200	ND
2018-02-28	4790-010-1100	ND
2018-02-28	4790-011-1130	ND