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Total trihalomethanes (TTHMs)

Jackson Township Water Authority

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Read More.

Studies conducted in the U.S. and Europe have found that drinking tap water that carries disinfection byproducts increases the risk of developing bladder cancer. In animal studies, all trihalomethanes cause liver, kidney and intestinal tumors. Some human epidemiological studies also reported an association between disinfection byproducts and an increased risk of problems during pregnancy, including spontaneous miscarriage, cardiovascular defects, neural tube defects and low birth weight.

In 2010, the California Office of Environmental Health Hazard Assessment published a draft public health goal for the trihalomethanes group at 0.8 parts per billion, or 100 times lower than the federal legal limit of 80 parts per billion for this contaminant group.

Click here to read more about disinfection byproducts.

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201078.0 ppb101021.1 ppb - 123.3 ppb
201183.9 ppb6625.3 ppb - 111.3 ppb
201273.0 ppb7729.8 ppb - 113.9 ppb
201372.0 ppb8837.5 ppb - 121.0 ppb
201473.7 ppb9928.8 ppb - 138.0 ppb
201573.9 ppb8821.7 ppb - 122.0 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.8 ppb

The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 80 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-02-0210 0305931.6 ppb
2010-02-0210 0305821.1 ppb
2010-02-0210 0305747.0 ppb
2010-05-0410 1267157.9 ppb
2010-08-0310 24733119.5 ppb
2010-08-0310 24736123.3 ppb
2010-08-0310 2473495.6 ppb
2010-11-0210 36896106.9 ppb
2010-11-0210 3689484.3 ppb
2010-11-0210 3689592.7 ppb
2011-02-0811 0490625.3 ppb
2011-06-2811 24783111.3 ppb
2011-06-2811 24780107.9 ppb
2011-08-0211 2995088.0 ppb
2011-11-0111 4383484.3 ppb
2011-12-0611 4928186.7 ppb
2012-02-0712 0578741.4 ppb
2012-02-0712 0578829.8 ppb
2012-05-0112 2034460.3 ppb
2012-08-0712 38101113.9 ppb
2012-08-1412 4020390.7 ppb
2012-11-062110396-04101.0 ppb
2012-11-062110396-0573.7 ppb
2013-02-053020219-0554.7 ppb
2013-02-053020219-0437.5 ppb
2013-05-143051124-0360.6 ppb
2013-05-143051124-0253.1 ppb
2013-08-063080405-0589.9 ppb
2013-08-063080405-04121.0 ppb
2013-11-053110268-0156.9 ppb
2013-11-053110268-02102.0 ppb
2014-02-064020502-0147.1 ppb
2014-02-064020502-0228.8 ppb
2014-05-064050518-0140.0 ppb
2014-05-064050518-0262.0 ppb
2014-08-054080329-0176.2 ppb
2014-08-054080329-02138.0 ppb
2014-08-194082011-01102.0 ppb
2014-11-044110186-0294.0 ppb
2014-11-044110186-0174.8 ppb
2015-02-031244545721.7 ppb
2015-02-161244546243.2 ppb
2015-05-051280076558.0 ppb
2015-05-051280076090.4 ppb
2015-08-041318323792.9 ppb
2015-08-0413183232122.0 ppb
2015-11-031355958165.0 ppb
2015-11-031355958098.0 ppb