National Drinking Water Database

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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.

State	Water Suppliers with N-nitrosopyrrolidine (npyr) contamination
	Systems	Population
Illinois	3	378,242
California	1	170,000
Total	4	548,242

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

Rank	System	Population Served	Positive test results of total reported tests	Average Level (Range)
1	IL American-East ST Louis Creve Coeur, IL	155,382	1 of 1	0.01 ppb (0.01 ppb)
2	Decatur Decatur, IL	81,860	1 of 1	< 0.01 ppb (< .01 to 0.0066 ppb)
3	IL American-Champaign Creve Coeur, IL	141,000	1 of 1	< 0.01 ppb (< .01 to 0.0036 ppb)
4	Sacramento Suburban Water District Sacramento, CA	170,000	1 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