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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Washington Aqueduct Division

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.00625 ppb81ND - 0.0500 ppb
2013ND80ND
20140.0113 ppb81ND - 0.0900 ppb
2015ND80ND
20160.00875 ppb81ND - 0.0700 ppb
20170.00500 ppb101ND - 0.0500 ppb

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
2012-01-01McMillanND
2012-01-01DalecarliaND
2012-04-01DalecarliaND
2012-04-01McMillanND
2012-07-01DalecarliaND
2012-07-01McMillan0.0500 ppb
2012-10-01DalecarliaND
2012-10-01McMillanND
2013-01-01DalecarliaND
2013-01-01McMillanND
2013-04-01DalecarliaND
2013-04-01McMillanND
2013-07-01McMillanND
2013-07-01DalecarliaND
2013-10-01DalecarliaND
2013-10-01McMillanND
2014-01-01DalecarliaND
2014-01-01McMillanND
2014-04-01DalecarliaND
2014-04-01McMillanND
2014-07-01Dalecarlia0.0900 ppb
2014-07-01McMillanND
2014-10-01DalecarliaND
2014-10-01McMillanND
2015-01-01DalecarliaND
2015-01-01McMillanND
2015-04-01DalecarliaND
2015-04-01McMillanND
2015-07-01DalecarliaND
2015-07-01McMillanND
2015-10-01McMillanND
2015-10-01DalecarliaND
2016-01-01DalecarliaND
2016-01-01McMillanND
2016-04-01DalecarliaND
2016-04-01McMillanND
2016-07-01Dalecarlia0.0700 ppb
2016-07-01McMillanND
2016-10-01McMillanND
2016-10-01DalecarliaND
2017-01-01DalecarliaND
2017-01-01McMillanND
2017-04-01DalecarliaND
2017-04-01McMillanND
2017-07-01DalecarliaND
2017-07-01McMillan0.0500 ppb
2017-10-01DalecarliaND
2017-10-01McMillanND
2017-12-01DalecarliaND
2017-12-01McMillanND