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National Drinking Water Database

National Drinking Water Database - Chemical Contaminants


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

n-Propylbenzene is a solvent used in textile dyeing and printing, a pollutant from asphalt and landfill leachate, and a constituent of petroleum and coal.

Found above
health guidelines
Found above
legal limit
Water utilities
People Served

Health Concerns for n-Propylbenzene:

n-Propylbenzene Exposure by State

Water utilities in 17 states have reported detecting n-Propylbenzene in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with n-Propylbenzene contamination
New York1071,252
Rhode Island270,133
New Mexico156,000
North Carolina7964
New Jersey1960
New Hampshire2161

The Most Polluted Communities

43 water utilities reported detecting n-Propylbenzene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average n-Propylbenzene level

RankSystem Population Served Positive test results of total reported tests Average Level
1Collingwood Associates, L.P.
King Of Prussia, NY
3601 of 324 ppb
(0 to 72 ppb)
2Long Beach Water Department
Long Beach, WA
2,8651 of 115.45 ppb
(0 to 60 ppb)
3Jericho Underhill Water
Underhill, VT
8254 of 75.23 ppb
(0 to 28.2 ppb)
4Freedom Sanitary District
Kaukauna, WI
1,0001 of 11.1 ppb
(1.1 ppb)
5Round Lake
Round Lake, MN
4241 of 40.95 ppb
(0 to 3.8 ppb)
6Hudson Water Supply
Hudson, IA
2,1171 of 10.8 ppb
(0.8 ppb)
7Winterset Municipal Waterworks
Winterset, IA
4,7681 of 10.8 ppb
(0.8 ppb)
8Flathead Co Water District NO 8
Whitefish, MT
3501 of 40.78 ppb
(0 to 3.1 ppb)
9Ashebrook Park
Gastonia, NC
2391 of 20.7 ppb
(0 to 1.4 ppb)
10Durham Park Wsc
Liberty Hill, TX
5581 of 60.69 ppb
(0 to 4.15 ppb)

Testing Summary for n-Propylbenzene

Are tests routinely required for n-Propylbenzene by federal law?No
Water suppliers reporting tests for n-Propylbenzene (2004-2009):20,585 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year

Occupational hazards

Type of concern: Reference:
Allowed workplace exposures restricted to low doses European Union - Classification & Labelling

Irritation (skin, eyes, or lungs)

Type of concern: Reference:
Classified as irritant European Union - Classification & Labelling

Organ system toxicity (non-reproductive)

Type of concern: Reference:
Classified as potentially toxic or harmful European Union - Classification & Labelling
Classified as not expected to be potentially toxic or harmful Environment Canada Domestic Substance List


Type of concern: Reference:
Wildlife and environmental toxicity European Union - Classification & Labelling
Not suspected to be an environmental toxin Environment Canada Domestic Substance List


Type of concern: Reference:
Occupational hazards related to handling European Union - Classification & Labelling

Persistence and bioaccumulation

Type of concern: Reference:
Not suspected to be persistent Environment Canada Domestic Substance List
Not suspected to be bioaccumulative Environment Canada Domestic Substance List

Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
European Union - Classification & LabellingCUMENE; [1] ; PROPYLBENZENE [2]•Flammable
•Harmful: may cause lung damage if swallowed
•Irritant (eyes, skin, or lungs)
•Irritating to respiratory system
•Dangerous for the environment
•Toxic to aquatic organisms
Environment Canada Domestic Substance ListBENZENE, PROPYL-•This chemical was NOT flagged by CEPA for further attention.


government/industry list/academic study reference
European Union - Classification & LabellingCPS&Q (Consumer Products Safety & Quality) formely known as ECB (European Chemicals Bureau). 2008. Classification and Labelling: Chemicals: Annex VI of Directive 67/548/EEC through the 31st ATP.
Environment Canada Domestic Substance ListEC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.

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