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N-Nitrosodimethylamine (NDMA)

La Puente 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.

 

213

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
20120.0370 ppt541ND - 2.00 ppt
20130.0910 ppt552ND - 3.00 ppt
20140.135 ppt521ND - 7.00 ppt
2015ND520ND

ppt = parts per trillion.

State and national drinking water standards and health guidelines

Health Guideline 3 ppt

The 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
2012-01-049588-013-1500ND
2012-01-099588-013-0837ND
2012-01-179588-013-1020ND
2012-01-249588-013-0815ND
2012-01-309588-013-1210ND
2012-02-069588-013-0827ND
2012-02-139588-013-0831ND
2012-02-219588-013-1045ND
2012-02-279588-013-1100ND
2012-03-059588-013-1053ND
2012-03-129588-013-0824ND
2012-03-199588-013-0755ND
2012-03-269588-013-0823ND
2012-04-029588-013-0852ND
2012-04-099588-013-1248ND
2012-04-169588-013-0940ND
2012-04-239588-013-1439ND
2012-05-019588-013-0835ND
2012-05-079588-013-0719ND
2012-05-149588-013-1300ND
2012-05-219588-013-0844ND
2012-05-299588-013-1027ND
2012-06-049588-013-0915ND
2012-06-119588-013-1241ND
2012-06-189588-013-1005ND
2012-06-259588-013-1010ND
2012-07-039588-013-0721ND
2012-07-099588-013-0745ND
2012-07-179588-013-0945ND
2012-07-239588-013-1120ND
2012-07-309588-013-1025ND
2012-08-069588-013-1335ND
2012-08-139588-013-14152.00 ppt
2012-08-209588-013-0925ND
2012-08-279588-013-1315ND
2012-09-049588-013-1510ND
2012-09-109588-013-1300ND
2012-09-179588-013-1225ND
2012-09-249588-013-0958ND
2012-10-029588-013-0849ND
2012-10-099588-013-1430ND
2012-10-159588-013-1325ND
2012-10-229588-013-1155ND
2012-10-299588-013-1510ND
2012-11-059588-013-1227ND
2012-11-139588-013-0924ND
2012-11-159588-013-1250ND
2012-11-199588-013-1226ND
2012-11-269588-013-1053ND
2012-12-049588-013-0810ND
2012-12-109588-013-1241ND
2012-12-179588-013-1241ND
2012-12-249588-013-1055ND
2012-12-319588-013-1050ND
2013-01-079588-013-1308ND
2013-01-149588-013-1256ND
2013-01-229588-013-1118ND
2013-01-289588-013-1245ND
2013-02-049588-013-1315ND
2013-02-119588-013-0920ND
2013-02-209588-013-0940ND
2013-02-259588-013-1030ND
2013-03-049588-013-1342ND
2013-03-119588-013-1240ND
2013-03-189588-013-1250ND
2013-03-259588-013-1250ND
2013-04-019588-013-1225ND
2013-04-059588-013-1115ND
2013-04-089588-013-1433ND
2013-04-159588-013-1240ND
2013-04-229588-013-1210ND
2013-04-299588-013-1308ND
2013-05-069588-013-1255ND
2013-05-139588-013-1117ND
2013-05-289588-013-1357ND
2013-06-039588-013-1024ND
2013-06-109588-013-1411ND
2013-06-179588-013-12413.00 ppt
2013-06-259588-013-0939ND
2013-07-019588-013-1308ND
2013-07-089588-013-1316ND
2013-07-159588-013-1209ND
2013-07-239588-013-1139ND
2013-07-299588-013-1330ND
2013-08-059588-013-1445ND
2013-08-099588-013-0000ND
2013-08-139588-013-0945ND
2013-08-199588-013-1253ND
2013-08-239588-013-1310ND
2013-08-269588-013-1344ND
2013-09-039588-013-1505ND
2013-09-109588-013-1307ND
2013-09-169588-013-1420ND
2013-09-239588-013-1008ND
2013-10-019588-013-1403ND
2013-10-079588-013-1348ND
2013-10-159588-013-1210ND
2013-10-229588-013-1305ND
2013-10-289588-013-1420ND
2013-11-049588-013-1244ND
2013-11-129588-013-0830ND
2013-11-189588-013-1505ND
2013-11-259588-013-1450ND
2013-12-049588-013-1419ND
2013-12-059588-013-1100ND
2013-12-099588-013-1230ND
2013-12-169588-013-1405ND
2013-12-239588-013-12502.00 ppt
2013-12-309588-013-1445ND
2014-01-079588-013-1114ND
2014-01-139588-013-1345ND
2014-01-219588-013-13307.00 ppt
2014-01-289588-013-1434ND
2014-02-039588-013-1243ND
2014-02-109588-013-1225ND
2014-02-199588-013-1206ND
2014-02-249588-013-1405ND
2014-03-039588-013-1317ND
2014-03-109588-013-1304ND
2014-03-179588-013-0829ND
2014-03-249588-013-1218ND
2014-04-019588-013-0951ND
2014-04-089588-013-0836ND
2014-04-159588-013-0821ND
2014-04-229588-013-0817ND
2014-04-299588-013-0809ND
2014-05-069588-013-0819ND
2014-05-129588-013-0816ND
2014-05-209588-013-0847ND
2014-05-279588-013-0856ND
2014-06-039588-013-1130ND
2014-06-109588-013-1120ND
2014-06-179588-013-1057ND
2014-06-249588-013-0812ND
2014-07-019588-013-1024ND
2014-07-089588-013-1027ND
2014-07-159588-013-1434ND
2014-07-229588-013-0824ND
2014-07-299588-013-1201ND
2014-08-059588-013-0839ND
2014-08-129588-013-0824ND
2014-08-199588-013-0818ND
2014-08-269588-013-1500ND
2014-09-059588-013-1133ND
2014-09-109588-013-0925ND
2014-09-169588-013-1421ND
2014-09-239588-013-0851ND
2014-09-309588-013-0844ND
2014-10-079588-013-1047ND
2014-10-149588-013-1455ND
2014-10-219588-013-1239ND
2014-10-289588-013-1201ND
2014-11-049588-013-1037ND
2014-11-129588-013-1209ND
2014-11-189588-013-1501ND
2014-11-259588-013-1037ND
2014-12-029588-013-1247ND
2014-12-099588-013-1215ND
2014-12-179588-013-1435ND
2014-12-239588-013-1137ND
2014-12-309588-013-1412ND
2015-01-069588-013-1043ND
2015-01-129588-013-0825ND
2015-01-219588-013-0921ND
2015-01-289588-013-1552ND
2015-02-039588-013-1015ND
2015-02-109588-013-1046ND
2015-02-179588-013-1336ND
2015-02-249588-013-1119ND
2015-03-039588-013-1140ND
2015-03-109588-013-1011ND
2015-03-179588-013-1057ND
2015-03-239588-013-1449ND
2015-03-319588-013-0950ND
2015-04-079588-013-1109ND
2015-04-149588-013-0917ND
2015-04-219588-013-0925ND
2015-04-289588-013-0944ND
2015-05-049588-013-1316ND
2015-05-129588-013-0851ND
2015-05-199588-013-1010ND
2015-05-269588-013-1434ND
2015-06-029588-013-1355ND
2015-06-089588-013-1427ND
2015-06-169588-013-1200ND
2015-06-239588-013-0957ND
2015-06-299588-013-1309ND
2015-07-069588-013-1327ND
2015-07-149588-013-1248ND
2015-07-219588-013-1018ND
2015-07-279588-013-1415ND
2015-07-299588-013-1237ND
2015-08-049588-013-1155ND
2015-08-109588-013-1411ND
2015-08-189588-013-1245ND
2015-08-259588-013-1321ND
2015-09-019588-013-1441ND
2015-09-089588-013-1344ND
2015-09-169588-013-1109ND
2015-09-229588-013-1333ND
2015-09-299588-013-1046ND
2015-10-069588-013-0921ND
2015-10-139588-013-1042ND
2015-10-209588-013-1231ND
2015-11-039588-013-1348ND
2015-11-109588-013-1032ND
2015-11-179588-013-1145ND
2015-11-249588-013-1027ND
2015-12-019588-013-1236ND
2015-12-089588-013-1329ND
2015-12-159588-013-1321ND
2015-12-219588-013-1217ND
2015-12-299588-013-0929ND