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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

N-nitrosopyrrolidine (npyr)


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

N-nitrosopyrrolidine is a synthetic chemical with limited research use; it is classified as possibly carcinogenic to humans.

 
Detected
Found above
health guidelines
Found above
legal limit
States
2
-
-
Water utilities
4
-
-
People Served
548,242
-
-

N-nitrosopyrrolidine (npyr) Exposure by State

Water utilities in 2 states have reported detecting N-nitrosopyrrolidine (npyr) in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with N-nitrosopyrrolidine (npyr) contamination
SystemsPopulation
Illinois3378,242
California1170,000
Total4548,242

The Most Polluted Communities

4 water utilities reported detecting N-nitrosopyrrolidine (npyr) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average N-nitrosopyrrolidine (npyr) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1IL American-East ST Louis
Creve Coeur, IL
155,3821 of 10.01 ppb
(0.01 ppb)
2Decatur
Decatur, IL
81,8601 of 1< 0.01 ppb
(< .01 to 0.0066 ppb)
3IL American-Champaign
Creve Coeur, IL
141,0001 of 1< 0.01 ppb
(< .01 to 0.0036 ppb)
4Sacramento Suburban Water District
Sacramento, CA
170,0001 of 17< 0.01 ppb
(< .01 to 0.000714 ppb)

Testing Summary for N-nitrosopyrrolidine (npyr)

Are tests routinely required for N-nitrosopyrrolidine (npyr) by federal law?No
Water suppliers reporting tests for N-nitrosopyrrolidine (npyr) (2006-2009):20 of 47,576
Average testing rate for water supplier reporting tests (2006-2009):1.1 per year