The Power of Information

National Drinking Water Database


Chloroform in Washington


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 Washington

700 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)
1Orient Water Company
Orient, WA
1006 of 6105.48 ppb
(60 to 193 ppb)
2Point Roberts Water District NO 4
Point Robert, WA
1,30012 of 1282.23 ppb
(52.6 to 132.7 ppb)
3Tamoshan
Olympia, WA
2604 of 473.93 ppb
(71.3 to 78.6 ppb)
4Spring Point Homeowners Association
Deer Harbor, WA
9010 of 1363.34 ppb
(0 to 122.7 ppb)
5Roche Harbor Water System Inc
Friday Harbor, WA
32925 of 2859.79 ppb
(0 to 111 ppb)
6Town of Friday Harbor
Friday Harbor, WA
1,99513 of 1349.85 ppb
(22.6 to 79 ppb)
7Raymond Water Department
Raymond, WA
2,97013 of 1348.07 ppb
(25.8 to 76.7 ppb)
8San Juan Ranchos
Friday Harbor, WA
287 of 848.05 ppb
(0 to 94.5 ppb)
9City of Lynnwood
Lynnwood, WA
34,54012 of 1243.94 ppb
(23 to 56.6 ppb)
10Mcneil Island Water
Steilacoom, WA
1,70014 of 1542.52 ppb
(0 to 74 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 Washington

There are no violations reported for this contaminant in Washington