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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-Butylbenzene is an intermediate for chemical manufacturing and a raw material for liquid crystals.

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

Health Concerns for n-Butylbenzene:

n-Butylbenzene Exposure by State

Water utilities in 10 states have reported detecting n-Butylbenzene in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with n-Butylbenzene contamination
New Mexico156,000
New York63,299
North Carolina61,560
Rhode Island1292

The Most Polluted Communities

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

Ranked by highest average n-Butylbenzene level

RankSystem Population Served Positive test results of total reported tests Average Level
1Cedar Hollow Mobile Home Park
Wappingers Falls, NY
2002 of 212.25 ppb
(0.5 to 24 ppb)
2Jericho Underhill Water
Underhill, VT
8251 of 72.03 ppb
(0 to 14.2 ppb)
3Collingwood Associates, L.P.
King Of Prussia, NY
3601 of 31.13 ppb
(0 to 3.4 ppb)
4Metz Water Association
Spokane, WA
2502 of 30.8 ppb
(0 to 1.3 ppb)
5Baker Apartments
341 of 10.5 ppb
(0.5 ppb)
6Bedford Hills/Taconic Corr. Facilities
Bedford Hills, NY
1,1001 of 10.5 ppb
(0.5 ppb)
Stewartsville, MO
7321 of 20.36 ppb
(0 to 0.71 ppb)
8Prairie View Acres Subd
Wentzville, MO
1351 of 20.3 ppb
(0 to 0.59 ppb)
9Walraven Subdivision
Houston, TX
251 of 30.29 ppb
(0 to 0.86 ppb)
10City of Nebraska City
Nebraska City, NE
6,5911 of 170.22 ppb
(0 to 3.7 ppb)

Testing Summary for n-Butylbenzene

Are tests routinely required for n-Butylbenzene by federal law?No
Water suppliers reporting tests for n-Butylbenzene (2004-2009):20,581 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year

Endocrine disruption

Type of concern: Reference:
Limited evidence of endocrine disruption Japanese National Institute of Health Sciences


Type of concern: Reference:
Suspected to be an environmental toxin Environment Canada Domestic Substance List

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

Organ system toxicity (non-reproductive)

Type of concern: Reference:
Classified as not expected to be potentially toxic or harmful Environment Canada Domestic Substance List

Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
Japanese National Institute of Health Sciences1-BUTYLPROPANE•Endocrine toxicity hazards: suspected
Environment Canada Domestic Substance ListBENZENE, BUTYL-•This chemical was NOT flagged by CEPA for further attention. The chemical was flagged for suspected aquatic toxicity.


government/industry list/academic study reference Toxicity InformationJapanese National Institute of Health Sciences. Lists of Paradigmatic Chemicals.
Environment Canada Domestic Substance ListEC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.

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