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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.

tert-Butylbenzene is a pollutant from the incomplete combustion of fossil fuels and various industrial processes.

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

Health Concerns for tert-Butylbenzene:

tert-Butylbenzene Exposure by State

Water utilities in 6 states have reported detecting tert-Butylbenzene in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with tert-Butylbenzene contamination
New York430,705
North Carolina51,169

The Most Polluted Communities

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

Ranked by highest average tert-Butylbenzene level

RankSystem Population Served Positive test results of total reported tests Average Level
1Bedford Hills/Taconic Corr. Facilities
Bedford Hills, NY
1,1001 of 10.5 ppb
(0.5 ppb)
2Woodbridge S/D
Mt Airy, NC
2722 of 100.46 ppb
(0 to 3.9 ppb)
3Providence North S/D
Stokesdale, NC
761 of 90.28 ppb
(0 to 2.5 ppb)
4Ponderosa Mobile Home Park
Jeffersonton, VA
601 of 50.24 ppb
(0 to 1.2 ppb)
5Metz Water Association
Spokane, WA
2501 of 30.19 ppb
(0 to 0.58 ppb)
6Middle Creek Master
Garner, NC
6811 of 160.18 ppb
(0 to 2.8 ppb)
7Wild Oaks Water Company
Rockport, NY
8051 of 30.17 ppb
(0 to 0.5 ppb)
8Watson Chapel Water Assoc
Pine Bluff, AR
6,1122 of 120.13 ppb
(0 to 0.88 ppb)
9Mcwa, Genesee West
Rochester, NY
8002 of 30.12 ppb
(0 to 0.23 ppb)
10Dove Meadows S/D
Gastonia, NC
412 of 130.09 ppb
(0 to 0.7 ppb)

Testing Summary for tert-Butylbenzene

Are tests routinely required for tert-Butylbenzene by federal law?No
Water suppliers reporting tests for tert-Butylbenzene (2004-2009):20,563 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year


Type of concern: Reference:
Not suspected to be an environmental toxin 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

Persistence and bioaccumulation

Type of concern: Reference:
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)
Environment Canada Domestic Substance ListBENZENE, (1,1-DIMETHYLETHYL)-•This chemical was NOT flagged by CEPA for further attention. The chemical was flagged for suspected persistence.


government/industry list/academic study reference
Environment Canada Domestic Substance ListEC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.

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