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EWG's Tap Water Database — 2019 UPDATE

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N-Nitrosodimethylamine (NDMA)

Monterey Park 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.

 

276

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.654 ppt522ND - 30.0 ppt
20130.208 ppt483ND - 5.00 ppt
20140.913 ppt463ND - 28.0 ppt
20150.0540 ppt371ND - 2.00 ppt
20160.0420 ppt481ND - 2.00 ppt
2017ND450ND

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
2012-01-099588-006-0735ND
2012-01-099588-043-0740ND
2012-01-099588-085-0730ND
2012-01-119588-010-0905ND
2012-01-119588-010-0905ND
2012-01-119588-013-0835ND
2012-01-119588-013-0835ND
2012-01-119588-038-0855ND
2012-01-119588-038-0855ND
2012-01-119588-081-0800ND
2012-01-119588-081-080030.0 ppt
2012-04-039588-006-1140ND
2012-04-039588-010-1040ND
2012-04-039588-013-1010ND
2012-04-039588-038-0930ND
2012-04-039588-043-1225ND
2012-04-039588-081-0750ND
2012-04-039588-085-1230ND
2012-05-029588-010-1047ND
2012-05-029588-010-1047ND
2012-05-029588-013-1138ND
2012-05-029588-013-1138ND
2012-05-029588-038-1057ND
2012-05-029588-038-10574.00 ppt
2012-05-029588-081-0842ND
2012-05-029588-081-0842ND
2012-07-109588-006-1130ND
2012-07-109588-010-1045ND
2012-07-109588-010-1045ND
2012-07-109588-013-1025ND
2012-07-109588-013-1025ND
2012-07-109588-043-1145ND
2012-07-109588-081-0945ND
2012-07-109588-081-0945ND
2012-07-109588-085-1230ND
2012-07-159588-038-1115ND
2012-07-159588-038-1115ND
2012-08-149588-002-1005ND
2012-08-149588-011-0905ND
2012-10-089588-010-0840ND
2012-10-089588-010-0840ND
2012-10-089588-013-0730ND
2012-10-089588-013-0730ND
2012-10-089588-038-0810ND
2012-10-089588-038-0810ND
2012-10-089588-081-0950ND
2012-10-089588-081-0950ND
2012-10-169588-006-0810ND
2012-10-169588-043-0815ND
2012-10-169588-085-0800ND
2012-11-059588-001-0900ND
2012-11-059588-006-0940ND
2013-01-089588-006-0650ND
2013-01-089588-010-1015ND
2013-01-089588-010-1015ND
2013-01-089588-013-1015ND
2013-01-089588-013-1015ND
2013-01-089588-038-1030ND
2013-01-089588-038-1030ND
2013-01-089588-043-0705ND
2013-01-089588-081-0900ND
2013-01-089588-081-0900ND
2013-01-089588-085-0805ND
2013-04-029588-006-0800ND
2013-04-029588-010-1115ND
2013-04-029588-010-1115ND
2013-04-029588-013-1155ND
2013-04-029588-013-1155ND
2013-04-029588-038-1130ND
2013-04-029588-038-1130ND
2013-04-029588-043-0827ND
2013-04-029588-081-09232.00 ppt
2013-04-029588-081-0923ND
2013-04-029588-085-0830ND
2013-07-089588-006-0955ND
2013-07-089588-010-0705ND
2013-07-089588-010-0705ND
2013-07-089588-013-0710ND
2013-07-089588-013-0710ND
2013-07-089588-038-0740ND
2013-07-089588-038-0740ND
2013-07-089588-043-1110ND
2013-07-089588-081-0825ND
2013-07-089588-081-0825ND
2013-07-089588-085-1120ND
2013-08-209588-002-0935ND
2013-08-209588-011-1055ND
2013-10-019588-006-1010ND
2013-10-019588-010-0800ND
2013-10-019588-010-0800ND
2013-10-019588-013-0730ND
2013-10-019588-013-0730ND
2013-10-019588-038-0720ND
2013-10-019588-038-0720ND
2013-10-019588-043-1100ND
2013-10-019588-081-0650ND
2013-10-019588-081-0650ND
2013-10-019588-085-11155.00 ppt
2013-11-199588-001-09053.00 ppt
2013-11-199588-006-1050ND
2014-01-149588-006-1000ND
2014-01-149588-043-1010ND
2014-01-149588-085-0950ND
2014-01-159588-010-0810ND
2014-01-159588-010-081012.0 ppt
2014-01-159588-013-0820ND
2014-01-159588-013-0820ND
2014-01-159588-038-0725ND
2014-01-159588-038-072528.0 ppt
2014-01-159588-081-0915ND
2014-01-159588-081-09152.00 ppt
2014-04-019588-006-0000ND
2014-04-019588-043-0000ND
2014-04-019588-085-0000ND
2014-04-089588-010-0945ND
2014-04-089588-010-0945ND
2014-04-089588-013-0820ND
2014-04-089588-013-0820ND
2014-04-089588-038-0840ND
2014-04-089588-038-0840ND
2014-04-089588-081-0910ND
2014-04-089588-081-0910ND
2014-07-089588-006-0000ND
2014-07-089588-010-0000ND
2014-07-089588-010-0000ND
2014-07-089588-013-0000ND
2014-07-089588-013-0000ND
2014-07-089588-038-0000ND
2014-07-089588-038-0000ND
2014-07-089588-043-0000ND
2014-07-089588-081-0000ND
2014-07-089588-081-0000ND
2014-07-089588-085-0000ND
2014-08-219588-002-0945ND
2014-08-219588-011-1000ND
2014-10-089588-006-0700ND
2014-10-089588-010-1000ND
2014-10-089588-010-1000ND
2014-10-089588-013-1025ND
2014-10-089588-013-1025ND
2014-10-089588-038-1010ND
2014-10-089588-038-1010ND
2014-10-089588-043-0750ND
2014-10-089588-081-1135ND
2014-10-089588-081-1135ND
2014-10-089588-085-0800ND
2015-01-139588-010-1145ND
2015-01-139588-010-1145ND
2015-01-139588-013-1205ND
2015-01-139588-013-1205ND
2015-01-139588-038-1155ND
2015-01-139588-038-1155ND
2015-01-139588-081-1205ND
2015-01-139588-081-1205ND
2015-01-149588-006-0750ND
2015-01-149588-043-0755ND
2015-01-149588-085-0850ND
2015-04-069588-010-1030ND
2015-04-069588-010-1030ND
2015-04-069588-013-0900ND
2015-04-069588-013-0900ND
2015-04-069588-038-0920ND
2015-04-069588-038-0920ND
2015-04-069588-081-0805ND
2015-04-069588-081-0805ND
2015-04-079588-006-0700ND
2015-04-079588-043-0750ND
2015-04-079588-085-0755ND
2015-07-079588-006-14592.00 ppt
2015-07-079588-010-0912ND
2015-07-079588-010-0912ND
2015-07-079588-013-0840ND
2015-07-079588-013-0840ND
2015-07-079588-043-1459ND
2015-07-079588-081-0945ND
2015-07-079588-081-0945ND
2015-07-079588-085-1459ND
2015-08-079588-038-0750ND
2015-08-079588-038-0750ND
2015-08-259588-002-1010ND
2015-08-259588-011-1105ND
2015-11-109588-001-1005ND
2015-11-109588-006-1100ND
2016-01-049588-006-0855ND
2016-01-049588-010-0416ND
2016-01-049588-010-0416ND
2016-01-049588-013-1020ND
2016-01-049588-013-1020ND
2016-01-049588-038-1010ND
2016-01-049588-038-1010ND
2016-01-049588-043-0930ND
2016-01-049588-081-1130ND
2016-01-049588-081-1130ND
2016-01-049588-085-0947ND
2016-04-059590-006-0755ND
2016-04-059590-010-1205ND
2016-04-059590-010-1205ND
2016-04-059590-013-1125ND
2016-04-059590-013-1125ND
2016-04-059590-038-1100ND
2016-04-059590-038-11002.00 ppt
2016-04-059590-043-0740ND
2016-04-059590-081-1035ND
2016-04-059590-081-1035ND
2016-04-059590-085-0845ND
2016-07-059590-006-0820ND
2016-07-059590-010-1140ND
2016-07-059590-010-1140ND
2016-07-059590-013-0940ND
2016-07-059590-013-0940ND
2016-07-059590-038-1155ND
2016-07-059590-038-1155ND
2016-07-059590-043-0830ND
2016-07-059590-081-1030ND
2016-07-059590-081-1030ND
2016-07-059590-085-0805ND
2016-08-119588-002-0920ND
2016-08-119588-011-0930ND
2016-10-049590-006-0800ND
2016-10-049590-010-1150ND
2016-10-049590-010-1150ND
2016-10-049590-013-1110ND
2016-10-049590-013-1110ND
2016-10-049590-043-0820ND
2016-10-049590-081-1220ND
2016-10-049590-081-1220ND
2016-10-049590-085-0740ND
2016-10-189590-038-0750ND
2016-10-189590-038-0750ND
2016-11-149588-001-0920ND
2016-11-149588-006-0945ND
2017-01-109590-006-1220ND
2017-01-109590-010-1035ND
2017-01-109590-010-1035ND
2017-01-109590-013-0950ND
2017-01-109590-013-0950ND
2017-01-109590-038-0930ND
2017-01-109590-038-0930ND
2017-01-109590-043-1240ND
2017-01-109590-081-0835ND
2017-01-109590-081-0835ND
2017-01-109590-085-1200ND
2017-04-039590-010-1000ND
2017-04-039590-010-1000ND
2017-04-039590-013-1025ND
2017-04-039590-013-1025ND
2017-04-039590-038-0855ND
2017-04-039590-038-0855ND
2017-04-039590-081-1220ND
2017-04-039590-081-1220ND
2017-04-049590-006-0835ND
2017-04-049590-043-0955ND
2017-04-049590-085-1035ND
2017-07-119590-010-1145ND
2017-07-119590-010-1145ND
2017-07-119590-013-1110ND
2017-07-119590-013-1110ND
2017-07-119590-038-1128ND
2017-07-119590-038-1128ND
2017-07-119590-081-1210ND
2017-07-119590-081-1210ND
2017-08-159588-002-0915ND
2017-08-159588-011-0930ND
2017-11-079590-006-1300ND
2017-11-079590-010-0945ND
2017-11-079590-010-0945ND
2017-11-079590-013-0805ND
2017-11-079590-013-0805ND
2017-11-079590-038-0900ND
2017-11-079590-038-0900ND
2017-11-079590-043-1320ND
2017-11-079590-081-1020ND
2017-11-079590-081-1020ND
2017-11-079590-085-1245ND
2017-11-099588-001-0905ND
2017-11-099588-006-0930ND