The Power of Information

National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

N-nitrosodi-n-butylamine (ndba)


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

N-nitrosodi-n-butylamine is a synthetic chemical used in research and as an intermediate for production of other chemicals.

 
Detected
Found above
health guidelines
Found above
legal limit
States
1
-
-
Water utilities
2
-
-
People Served
208,551
-
-

N-nitrosodi-n-butylamine (ndba) Exposure by State

Water utilities in 1 states have reported detecting N-nitrosodi-n-butylamine (ndba) in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with N-nitrosodi-n-butylamine (ndba) contamination
SystemsPopulation
California2208,551
Total2208,551

The Most Polluted Communities

2 water utilities reported detecting N-nitrosodi-n-butylamine (ndba) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average N-nitrosodi-n-butylamine (ndba) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Pomona - City, Water Dept.
Pomona, CA
156,5001 of 30.73 ppb
(0 to 2.2 ppb)
2Gswc-San Dimas
San Dimas, CA
52,0511 of 3< 0.01 ppb
(< .01 to 0.002 ppb)

Testing Summary for N-nitrosodi-n-butylamine (ndba)

Are tests routinely required for N-nitrosodi-n-butylamine (ndba) by federal law?No
Water suppliers reporting tests for N-nitrosodi-n-butylamine (ndba) (2006-2009):18 of 47,576
Average testing rate for water supplier reporting tests (2006-2009):1.3 per year