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.
| State | Water Suppliers with N-nitrosodi-n-butylamine (ndba) contamination | |
|---|---|---|
| Systems | Population | |
| California | 2 | 208,551 |
| Total | 2 | 208,551 |
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
| Rank | System | Population Served | Positive test results of total reported tests | Average Level (Range) |
|---|---|---|---|---|
| 1 | Pomona - City, Water Dept. Pomona, CA | 156,500 | 1 of 3 | 0.73 ppb (0 to 2.2 ppb) |
| 2 | Gswc-San Dimas San Dimas, CA | 52,051 | 1 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 |