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EWG's Tap Water Database — 2019 UPDATE

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Simazine

Northwestern W and Sd-wtln 200

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for simazine. Sample information shown below was taken by Oregon City.

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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0136 ppb82ND - 0.0550 ppb
20130.00600 ppb91ND - 0.0540 ppb
20140.0112 ppb61ND - 0.0670 ppb
20150.0273 ppb31ND - 0.0820 ppb
2016ND30ND
20170.0203 ppb31ND - 0.0610 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

NOTE: Northwestern W and Sd-wtln 200 purchases water from Oregon City which is required to test for simazine. Sample information shown below was taken by Oregon City.

Date Lab ID Result
2012-01-1912-10787-04ND
2012-04-1112-14016-040.0540 ppb
2012-04-2312-14420-01ND
2012-05-0912-15227-04ND
2012-05-1712-15631-01ND
2012-06-1312-16885-04ND
2012-07-1112-18365-040.0550 ppb
2012-10-1512-23220-04ND
2013-01-0913-10433-04ND
2013-04-1013-14397-04ND
2013-04-2213-14828-01ND
2013-05-1313-15843-01ND
2013-05-2213-16313-04ND
2013-06-0513-17058-04ND
2013-06-2613-18216-010.0540 ppb
2013-07-1013-18921-04ND
2013-10-1613-24061-04ND
2014-01-1414-10658-010.0670 ppb
2014-04-0714-14115-04ND
2014-05-2814-16557-01ND
2014-06-0914-17261-01ND
2014-07-1514-19339-01ND
2014-10-0814-23915-04ND
2015-04-1415-14752-01ND
2015-05-1315-16155-040.0820 ppb
2015-06-0915-17697-01ND
2016-04-1916-15737-04ND
2016-05-1216-17050-04ND
2016-06-0816-18463-04ND
2017-04-1217-16330-04ND
2017-05-3017-19338-01ND
2017-06-0517-19688-010.0610 ppb