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National Drinking Water Database


Chloroform in Delaware


Chloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water. [read more]

The Most Polluted Communities in Delaware

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

Ranked by highest average Chloroform level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Frankford Water Department
Frankford, DE
90014 of 1557.05 ppb
(0 to 139 ppb)
2Pepper Ridge Park
DE
18010 of 1055.79 ppb
(0.55 to 129 ppb)
3Point Farm
Dover, DE
21313 of 1338.62 ppb
(4.6 to 110 ppb)
4Bethany Beach Water Department
Bethany Beach, DE
12,12812 of 1236.01 ppb
(2.07 to 107 ppb)
5Selbyville Water Department
Selbyville, DE
1,64525 of 2728.13 ppb
(0 to 77.1 ppb)
6Mallard Lakes
Selbyville, DE
90012 of 1326.96 ppb
(0 to 48.2 ppb)
7South Bethany
Newark, DE
12,00030 of 3126.54 ppb
(0 to 65.97 ppb)
8West Dover District
DE
1,1583 of 319.82 ppb
(16.7 to 22.3 ppb)
9Cooper Farms
Dover, DE
2048 of 819.76 ppb
(2.49 to 51 ppb)
10United Water Delaware
Wilmington, DE
105,27025 of 2719.48 ppb
(0 to 41.85 ppb)

Health Based Limits for Chloroform

StandardDescriptionLevel
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.5.7 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.35 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.70 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.70 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.80 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

Violation Summary for Chloroform in Delaware

There are no violations reported for this contaminant in Delaware