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EWG's Tap Water Database — 2019 UPDATE

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N-Nitrosodimethylamine (NDMA)

Glendale Water Department

N-Nitrosodimethylamine is one of the DNA-damaging, cancer-causing contaminants called N-nitrosamines that can form during water treatment with the use of certain disinfectants, such as chloramine. Read More.

Pollution of water sources with effluent from municipal wastewater treatment plants and runoff from animal feeding operations contributes to nitrosamine formation. Fifteen different nitrosamines are listed as carcinogens in the U.S. Department of Health and Human Services National Toxicology Program Report on Carcinogens. The federal government has not set a legal limit for nitrosamines in drinking water and water utilities typically do not test for these contaminants. California has set a public health goal for one of the most common nitrosamines, N-nitrosodimethylamine or NDMA, at 0.003 parts per billion in drinking water, a concentration that corresponds to an estimated one-in-one-million cancer risk.

Click here to read more about disinfection byproducts.

 

233

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.325 ppt405ND - 3.00 ppt
2013ND400ND
20140.658 ppt382ND - 23.0 ppt
2015ND400ND
20160.245 ppt382ND - 6.40 ppt
2017ND370ND

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 3 ppt

The EWG Health Guideline of 3 ppt for n-nitrosodimethylamine was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppt = parts per trillion

All test results

Date Lab ID Result
2012-01-109590-069-0905ND
2012-01-109590-069-0905ND
2012-02-159590-069-0914ND
2012-02-159590-069-0914ND
2012-02-159590-070-0922ND
2012-02-159590-070-0922ND
2012-03-149590-069-0900ND
2012-03-149590-069-0900ND
2012-03-149590-070-0910ND
2012-03-149590-070-0910ND
2012-04-119590-069-09403.00 ppt
2012-04-119590-069-0940ND
2012-05-099590-069-08022.00 ppt
2012-05-099590-069-0802ND
2012-05-099590-070-08102.00 ppt
2012-05-099590-070-0810ND
2012-06-139590-069-08303.00 ppt
2012-06-139590-069-0830ND
2012-06-139590-070-08403.00 ppt
2012-06-139590-070-0840ND
2012-07-119590-069-0746ND
2012-07-119590-069-0746ND
2012-08-159590-069-0917ND
2012-08-159590-069-0917ND
2012-08-159590-070-0928ND
2012-08-159590-070-0928ND
2012-09-129590-069-0742ND
2012-09-129590-069-0742ND
2012-09-129590-070-0751ND
2012-09-129590-070-0751ND
2012-10-109590-069-0740ND
2012-10-109590-069-0740ND
2012-11-149590-069-1010ND
2012-11-149590-069-1010ND
2012-11-149590-070-1019ND
2012-11-149590-070-1019ND
2012-12-129590-069-1052ND
2012-12-129590-069-1052ND
2012-12-129590-070-1101ND
2012-12-129590-070-1101ND
2013-01-099590-069-1058ND
2013-01-099590-069-1058ND
2013-02-119590-069-1130ND
2013-02-119590-069-1130ND
2013-02-119590-070-1132ND
2013-02-119590-070-1132ND
2013-03-139590-069-1100ND
2013-03-139590-069-1100ND
2013-03-139590-070-1108ND
2013-03-139590-070-1108ND
2013-04-109590-069-0950ND
2013-04-109590-069-0950ND
2013-05-159590-069-0741ND
2013-05-159590-069-0741ND
2013-05-159590-070-0752ND
2013-05-159590-070-0752ND
2013-06-139590-069-0750ND
2013-06-139590-069-0750ND
2013-06-139590-070-0757ND
2013-06-139590-070-0757ND
2013-07-109590-069-0904ND
2013-07-109590-069-0904ND
2013-08-149590-069-0823ND
2013-08-149590-069-0823ND
2013-08-149590-070-0833ND
2013-08-149590-070-0833ND
2013-09-119590-069-0835ND
2013-09-119590-069-0835ND
2013-09-119590-070-0845ND
2013-09-119590-070-0845ND
2013-10-099590-069-0945ND
2013-10-099590-069-0945ND
2013-11-139590-069-1046ND
2013-11-139590-069-1046ND
2013-11-139590-070-1058ND
2013-11-139590-070-1058ND
2013-12-119590-069-0850ND
2013-12-119590-069-0850ND
2013-12-119590-070-0901ND
2013-12-119590-070-0901ND
2014-01-159590-069-1010ND
2014-01-159590-069-1010ND
2014-02-129590-069-1048ND
2014-02-129590-069-1048ND
2014-02-139590-070-1050ND
2014-02-139590-070-1050ND
2014-03-129590-069-1054ND
2014-03-129590-069-1054ND
2014-03-129590-070-1103ND
2014-03-129590-070-1103ND
2014-04-099590-069-1040ND
2014-04-099590-069-1040ND
2014-05-149590-069-1003ND
2014-05-149590-069-1003ND
2014-05-149590-070-101723.0 ppt
2014-05-149590-070-1017ND
2014-06-119590-069-0933ND
2014-06-119590-069-0933ND
2014-06-119590-070-0947ND
2014-06-119590-070-0947ND
2014-07-099590-069-0923ND
2014-07-099590-069-0923ND
2014-08-059590-069-0857ND
2014-08-059590-069-0857ND
2014-08-139590-069-0813ND
2014-08-139590-069-0813ND
2014-08-139590-070-0823ND
2014-08-139590-070-0823ND
2014-09-109590-069-0847ND
2014-09-109590-069-0847ND
2014-09-109590-070-0857ND
2014-09-109590-070-0857ND
2014-10-149590-069-1223ND
2014-10-149590-069-12232.00 ppt
2014-12-109590-069-0943ND
2014-12-109590-069-0943ND
2014-12-109590-070-0953ND
2014-12-109590-070-0953ND
2015-01-149590-069-0941ND
2015-01-149590-069-0941ND
2015-02-119590-069-0913ND
2015-02-119590-069-0913ND
2015-02-119590-070-0923ND
2015-02-119590-070-0923ND
2015-03-099590-069-0927ND
2015-03-099590-069-0927ND
2015-03-099590-070-0937ND
2015-03-099590-070-0937ND
2015-04-159590-069-0811ND
2015-04-159590-069-0811ND
2015-05-139590-069-0837ND
2015-05-139590-069-0837ND
2015-05-139590-070-0847ND
2015-05-139590-070-0847ND
2015-06-109590-069-1041ND
2015-06-109590-069-1041ND
2015-06-109590-070-1051ND
2015-06-109590-070-1051ND
2015-07-159590-069-0957ND
2015-07-159590-069-0957ND
2015-08-129590-069-0603ND
2015-08-129590-069-0603ND
2015-08-129590-070-0613ND
2015-08-129590-070-0613ND
2015-09-089590-069-1011ND
2015-09-089590-069-1011ND
2015-09-089590-070-1027ND
2015-09-089590-070-1027ND
2015-10-149590-069-0903ND
2015-10-149590-069-0903ND
2015-11-109590-069-0715ND
2015-11-109590-069-0715ND
2015-11-109590-070-0710ND
2015-11-109590-070-0710ND
2015-12-099590-069-0901ND
2015-12-099590-069-0901ND
2015-12-099590-070-0913ND
2015-12-099590-070-0913ND
2016-01-139590-069-0931ND
2016-01-139590-069-0931ND
2016-02-109590-069-0937ND
2016-02-109590-069-0937ND
2016-02-109590-070-0947ND
2016-02-109590-070-0947ND
2016-03-099590-069-0927ND
2016-03-099590-069-0927ND
2016-03-099590-070-0937ND
2016-03-099590-070-0937ND
2016-04-139590-069-1057ND
2016-04-139590-069-1057ND
2016-05-119590-069-0901ND
2016-05-119590-069-0901ND
2016-05-119590-070-0913ND
2016-05-119590-070-0913ND
2016-07-139590-069-1017ND
2016-07-139590-069-1017ND
2016-08-119590-069-08576.40 ppt
2016-08-119590-069-0857ND
2016-08-119590-070-0907ND
2016-08-119590-070-0907ND
2016-09-149590-069-1051ND
2016-09-149590-069-1051ND
2016-09-149590-070-1103ND
2016-09-149590-070-1103ND
2016-10-139590-069-1027ND
2016-10-139590-069-1027ND
2016-11-109590-069-1057ND
2016-11-109590-069-1057ND
2016-11-109590-070-1107ND
2016-11-109590-070-1107ND
2016-12-159590-069-0913ND
2016-12-159590-069-0913ND
2016-12-159590-070-0921ND
2016-12-159590-070-09212.90 ppt
2016-12-289590-069-1107ND
2016-12-289590-069-1107ND
2017-01-129588-069-1003ND
2017-01-129588-069-1003ND
2017-01-129588-070-1011ND
2017-02-219588-069-1027ND
2017-02-219588-069-1027ND
2017-02-219588-070-1033ND
2017-03-169588-069-1027ND
2017-03-169588-069-1027ND
2017-03-169588-070-1033ND
2017-04-139588-069-1017ND
2017-04-139588-069-1017ND
2017-04-139588-070-1027ND
2017-05-119588-069-0927ND
2017-05-119588-069-0927ND
2017-05-119588-070-0937ND
2017-06-129588-069-0847ND
2017-06-129588-069-0847ND
2017-06-129588-070-0857ND
2017-07-139588-069-0900ND
2017-07-139588-069-0900ND
2017-07-139588-070-0858ND
2017-08-109588-069-0921ND
2017-08-109588-069-0921ND
2017-08-109588-070-0931ND
2017-09-149588-069-0931ND
2017-09-149588-069-0931ND
2017-09-149588-070-0941ND
2017-09-149588-070-0941ND
2017-10-109588-069-1131ND
2017-10-109588-069-1131ND
2017-10-109588-070-1137ND
2017-11-169588-069-1113ND
2017-11-169588-069-1113ND
2017-11-169588-070-1121ND
2017-12-159588-069-0823ND
2017-12-159588-069-0823ND
2017-12-159588-070-0833ND