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National Drinking Water Database


Ethylbenzene in Arizona


Ethylbenzene is a pollutant from petroleum refineries and industrial chemical factories; it is also used to make plastics, and may be present as an impurity in some insecticides. [read more]

The Most Polluted Communities in Arizona

25 water utilities reported detecting Ethylbenzene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Ethylbenzene level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Sabrosa Water Co New Riv
Phoenix, AZ
2701 of 24 ppb
(0 to 8 ppb)
2American Ranch Dwid
AZ
7503 of 50.94 ppb
(0 to 2.8 ppb)
3North Mohave Valley Water Corporation
Bullhead City, AZ
2,6831 of 20.7 ppb
(0 to 1.4 ppb)
4Quintero Area Water System
Peoria, AZ
682 of 160.58 ppb
(0 to 6.1 ppb)
5Tucson Water-Catalina
Tucson, AZ
1,2001 of 60.53 ppb
(0 to 3.2 ppb)
6Desert Oasis
AZ
1,1904 of 80.52 ppb
(0 to 1.4 ppb)
7Eloy Municipal Water Dep
Eloy, AZ
6,7501 of 10.4 ppb
(0.4 ppb)
8Mountain View Well Assoc
Wittmann, AZ
281 of 50.38 ppb
(0 to 1.9 ppb)
9Starlight Water Company
Tucson, AZ
15012 of 220.31 ppb
(0 to 1.3 ppb)
10Wonderland Acres Dwid
Lakeside, AZ
4251 of 10.27 ppb
(0.27 ppb)

Health Based Limits for Ethylbenzene

StandardDescriptionLevel
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.300 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.530 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.700 ppb
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.700 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.700 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.3000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.3000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.30000 ppb

Violation Summary for Ethylbenzene in Arizona

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Arizona since 2004

Violation TypeNumber of Violations
Failure to monitor regularly155
Failure to monitor: Check/Repeat/Confirmation sampling1