Evaluation of the Final UCMR2 Database: Nationwide Trends in NDMA

• DOI: 10.5942/jawwa.2015.107.0009
• Publication Date: 2014-11-07T23:04:20Z
• Authors: Gwen C. Woods; Eric R. V. Dickenson
• Keywords: N-Nitrosodimethylamine; Disinfectant

The complete database of results from the second Unregulated Contaminant Monitoring Rule (UCMR2) was analyzed in depth for N ‐nitrosodimethylamine (NDMA) occurrence across United States and trends associated with factors reported. Disinfectant type, source waters, regional variability, population density, seasonal variability were all examined potential impacts on NDMA. Detectable levels NDMA found 17% samples 25% treatment plants. other five listed nitrosamines detected less than 1% samples. strongest factor positively chloramine use. Likewise, use surface waters to be linked such that (even when decoupled use) demonstrated elevated over groundwater sources. No clear could deciphered, but data supplied utilities servicing fewer 10,000 customers provide evidence smaller have some most extreme subsequently may a difficult time meeting any future regulation.