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EWG's Tap Water Database — 2021 UPDATE

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N-Nitrosodimethylamine (NDMA)

Valley County Water District

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.

MORE ABOUT THIS CONTAMINANT

 

253

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND410ND
2015ND400ND
2016ND420ND
2017ND440ND
2018ND440ND
2019ND420ND

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
2014-01-169588-005-1026ND
2014-01-169588-006-0854ND
2014-01-239588-001-1336ND
2014-02-209588-001-1416ND
2014-02-209588-006-1246ND
2014-03-249588-006-1240ND
2014-03-259588-001-1224ND
2014-04-109588-005-0728ND
2014-04-229588-001-1432ND
2014-04-229588-006-0907ND
2014-04-309588-002-0935ND
2014-05-139588-001-0910ND
2014-05-139588-002-0928ND
2014-05-139588-005-0831ND
2014-05-149588-006-1003ND
2014-06-109588-001-0833ND
2014-06-109588-002-0825ND
2014-06-109588-005-0750ND
2014-06-109588-006-1256ND
2014-07-179588-001-1030ND
2014-07-179588-002-1012ND
2014-07-289588-005-1025ND
2014-07-289588-006-1008ND
2014-08-199588-001-1255ND
2014-08-199588-005-1001ND
2014-08-199588-006-0930ND
2014-08-209588-002-0746ND
2014-09-099588-001-0936ND
2014-09-099588-002-0923ND
2014-09-099588-005-1248ND
2014-09-099588-006-1316ND
2014-10-279588-001-1115ND
2014-10-279588-002-1030ND
2014-10-279588-005-1337ND
2014-10-279588-006-1210ND
2014-11-179588-001-1020ND
2014-11-179588-002-1040ND
2014-11-179588-006-0915ND
2014-12-159588-006-1311ND
2014-12-229588-001-0935ND
2014-12-229588-002-0900ND
2015-01-219588-001-1344ND
2015-01-219588-002-1344ND
2015-01-219588-006-1242ND
2015-02-199588-001-0805ND
2015-02-199588-002-0820ND
2015-02-199588-006-0852ND
2015-03-049588-001-0800ND
2015-03-049588-002-0843ND
2015-03-049588-006-1250ND
2015-04-149588-001-0930ND
2015-04-149588-002-0950ND
2015-04-149588-006-0854ND
2015-05-189588-006-1331ND
2015-05-199588-001-0921ND
2015-05-199588-002-0856ND
2015-06-029588-005-1259ND
2015-06-179588-001-1000ND
2015-06-179588-002-1000ND
2015-06-179588-006-1300ND
2015-07-229588-001-0850ND
2015-07-229588-002-0917ND
2015-07-229588-006-1300ND
2015-08-189588-001-0735ND
2015-08-189588-002-0800ND
2015-08-189588-005-1428ND
2015-08-189588-006-1247ND
2015-09-169588-001-0825ND
2015-09-169588-002-0855ND
2015-09-169588-005-1331ND
2015-09-169588-006-1258ND
2015-10-269588-001-0814ND
2015-10-269588-002-0728ND
2015-10-269588-006-0928ND
2015-10-289588-005-0930ND
2015-11-189588-001-1010ND
2015-11-189588-002-1000ND
2015-11-189588-006-0923ND
2015-12-149588-001-1004ND
2015-12-149588-002-1029ND
2015-12-149588-006-1257ND
2016-01-199588-001-0920ND
2016-01-199588-002-0946ND
2016-01-199588-006-1247ND
2016-02-109588-001-1043ND
2016-02-109588-006-1240ND
2016-02-169588-002-0815ND
2016-03-159588-001-1225ND
2016-03-159588-002-1250ND
2016-03-159588-006-0911ND
2016-04-219588-001-1320ND
2016-04-219588-002-1250ND
2016-04-219588-006-1210ND
2016-05-179588-001-1246ND
2016-05-179588-002-1246ND
2016-05-179588-006-1015ND
2016-06-279588-001-1317ND
2016-06-279588-002-1520ND
2016-06-279588-005-1356ND
2016-06-279588-006-1140ND
2016-07-259588-001-1332ND
2016-07-259588-002-1250ND
2016-07-259588-005-1038ND
2016-07-259588-006-1109ND
2016-08-229588-005-1330ND
2016-08-229588-006-1429ND
2016-08-239588-001-1043ND
2016-08-239588-002-1043ND
2016-09-219588-001-1340ND
2016-09-219588-002-1323ND
2016-09-219588-005-1400ND
2016-09-219588-006-1437ND
2016-10-119588-001-1042ND
2016-10-119588-002-1024ND
2016-10-119588-005-1354ND
2016-10-119588-006-1430ND
2016-11-169588-001-1330ND
2016-11-169588-002-1240ND
2016-11-169588-005-1054ND
2016-11-169588-006-0935ND
2016-12-219588-001-0815ND
2016-12-219588-002-0800ND
2016-12-219588-006-1400ND
2017-01-189588-001-0950ND
2017-01-189588-002-1013ND
2017-01-189588-006-1310ND
2017-02-219588-006-0850ND
2017-02-229588-001-0950ND
2017-02-229588-002-0900ND
2017-03-219588-001-0800ND
2017-03-219588-002-0817ND
2017-03-219588-006-1015ND
2017-04-259588-001-1430ND
2017-04-259588-002-1430ND
2017-04-259588-005-1001ND
2017-04-259588-006-0900ND
2017-05-159588-001-1000ND
2017-05-159588-002-0945ND
2017-05-159588-006-0730ND
2017-05-199588-005-1246ND
2017-06-219588-005-1430ND
2017-06-229588-001-0816ND
2017-06-229588-002-0754ND
2017-06-229588-006-0955ND
2017-07-199588-001-0925ND
2017-07-199588-002-0903ND
2017-07-199588-005-1030ND
2017-07-199588-006-1000ND
2017-08-239588-005-1120ND
2017-08-239588-006-1021ND
2017-08-249588-001-0645ND
2017-08-249588-002-0723ND
2017-09-219588-005-1420ND
2017-09-219588-006-1350ND
2017-09-269588-001-1117ND
2017-09-269588-002-1117ND
2017-10-109588-001-0841ND
2017-10-109588-006-0947ND
2017-10-169588-002-1046ND
2017-10-169588-005-1331ND
2017-11-219588-001-0806ND
2017-11-219588-002-0825ND
2017-11-219588-006-0917ND
2017-11-229588-005-0220ND
2017-12-129588-006-1115ND
2017-12-139588-001-1104ND
2017-12-139588-002-1104ND
2018-01-169588-001-1031ND
2018-01-169588-002-0950ND
2018-01-169588-006-0922ND
2018-02-129588-001-1252ND
2018-02-129588-002-1252ND
2018-02-129588-006-1020ND
2018-02-219588-005-1355ND
2018-03-199588-002-0939ND
2018-03-199588-006-0820ND
2018-03-269588-005-1348ND
2018-04-189588-002-1347ND
2018-04-189588-005-1112ND
2018-04-259588-006-0816ND
2018-04-309588-001-1242ND
2018-05-189588-001-0839ND
2018-05-189588-002-0845ND
2018-05-189588-006-0830ND
2018-06-199588-001-1333ND
2018-06-199588-002-1340ND
2018-06-199588-005-0837ND
2018-06-199588-006-1245ND
2018-07-189588-001-1040ND
2018-07-189588-002-1126ND
2018-07-189588-005-1200ND
2018-07-189588-006-1410ND
2018-08-149588-001-0945ND
2018-08-149588-002-0937ND
2018-08-149588-005-0920ND
2018-08-149588-006-0925ND
2018-09-199588-001-0835ND
2018-09-199588-002-0825ND
2018-09-199588-005-0915ND
2018-09-199588-006-0850ND
2018-10-239588-001-1148ND
2018-10-239588-002-1137ND
2018-10-239588-005-1010ND
2018-10-239588-006-1347ND
2018-11-149588-001-1110ND
2018-11-149588-002-1100ND
2018-11-149588-006-0920ND
2018-11-199588-005-1135ND
2018-12-109588-001-0923ND
2018-12-109588-002-0935ND
2018-12-109588-006-1026ND
2019-01-229588-001-0927ND
2019-01-229588-002-0926ND
2019-01-229588-006-0735ND
2019-01-299588-005-1300ND
2019-02-129588-001-0834ND
2019-02-129588-002-0830ND
2019-02-129588-006-0935ND
2019-03-189588-001-1125ND
2019-03-189588-002-1112ND
2019-03-189588-006-0905ND
2019-04-159588-001-1333ND
2019-04-159588-002-1338ND
2019-04-159588-006-0840ND
2019-05-149588-001-1006ND
2019-05-149588-002-1001ND
2019-05-149588-006-0807ND
2019-06-119588-001-0839ND
2019-06-119588-002-0829ND
2019-06-119588-006-0731ND
2019-07-099588-001-0840ND
2019-07-099588-002-0830ND
2019-07-099588-006-1020ND
2019-07-169588-005-0750ND
2019-08-149588-001-0830ND
2019-08-149588-002-0820ND
2019-08-149588-005-1010ND
2019-08-149588-006-1240ND
2019-09-119588-001-0721ND
2019-09-119588-002-0710ND
2019-09-119588-005-0946ND
2019-09-119588-006-1340ND
2019-10-169588-001-1000ND
2019-10-169588-002-1015ND
2019-10-169588-005-0930ND
2019-10-169588-006-1236ND
2019-11-199588-001-1115ND
2019-11-199588-002-1140ND
2019-11-199588-005-0940ND
2019-11-199588-006-1020ND
2019-12-169588-001-0828ND
2019-12-169588-002-0820ND
2019-12-169588-006-1145ND