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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Monochlorobenzene (Chlorobenzene)


Status: Regulated - EPA has established a maximum legal limit in tapwater for this contaminant.

Monochlorobenzene is used as a solvent in pesticides, a degreasing agent and a chemical intermediate; it is released as a pollutant from various industrial chemical factories and has been found in surface and groundwater.

 
Detected
Found above
health guidelines
Found above
legal limit
States
20
-
-
Water utilities
61
-
-
People Served
1,313,995
-
-

Monochlorobenzene (Chlorobenzene) Exposure by State

Water utilities in 20 states have reported detecting Monochlorobenzene (Chlorobenzene) in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Monochlorobenzene (Chlorobenzene) contamination
SystemsPopulation
Florida8447,442
Delaware1201,000
California4175,183
New York4122,905
New Jersey3110,201
Massachusetts482,843
Rhode Island170,000
North Carolina1239,309
Pennsylvania525,249
Indiana318,510
Missouri36,197
Virginia33,974
Alabama13,450
Minnesota23,129
New Mexico12,401
Wisconsin21,365
Illinois1277
Oklahoma1250
New Hampshire1240
Maryland170
Total611,313,995

The Most Polluted Communities

61 water utilities reported detecting Monochlorobenzene (Chlorobenzene) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Monochlorobenzene (Chlorobenzene) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Brodhead Creek Reg Water Auth
East Stroudsburg, PA
22,5001 of 73.61 ppb
(0 to 25.3 ppb)
2Amenia Water District NO 1
Amenia, NY
1,0001 of 51.76 ppb
(0 to 8.8 ppb)
3Jasper Co Pwsd #2
Webb City, MO
3,3302 of 50.99 ppb
(0 to 3.37 ppb)
4Kountry Inn
Yulee, FL
261 of 90.88 ppb
(0 to 7.9 ppb)
5East Chelmsford Water District
Chelmsford, MA
2,0001 of 80.84 ppb
(0 to 6.7 ppb)
6Sullivan's Trailer Court, Inc.
Finksburg, MD
707 of 100.68 ppb
(0 to 1.1 ppb)
7Staples
Staples, MN
3,1044 of 60.57 ppb
(0 to 1.7 ppb)
8Mcconnellsburg Boro Muni Auth
Mcconnellsburg, PA
2,0002 of 50.56 ppb
(0 to 1.8 ppb)
9Sugarcreek Borough
Franklin, PA
4991 of 10.5 ppb
(0.5 ppb)
10Bedford Hills/Taconic Corr. Facilities
Bedford Hills, NY
1,1001 of 10.5 ppb
(0.5 ppb)

Health Based Limits for Monochlorobenzene (Chlorobenzene)

StandardDescriptionLevel
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.100 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.100 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.100 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.130 ppb
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.200 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.700 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.4000 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.4000 ppb

Testing Summary for Monochlorobenzene (Chlorobenzene)

Are tests routinely required for Monochlorobenzene (Chlorobenzene) by federal law?Yes
Water suppliers reporting tests for Monochlorobenzene (Chlorobenzene) (2004-2009):33,931 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year

Violation Summary for Monochlorobenzene (Chlorobenzene)

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards for Monochlorobenzene (Chlorobenzene) since 2004

Maximum Contaminant Level Exceedance Violations0
Monitoring Violations4,304
Reporting Violations0