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EWG's Tap Water Database — 2021 UPDATE

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Total trihalomethanes (TTHMs)

Fredonia Village

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.

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

113

Samples

10

Samples exceeding legal limit (MCL)

113

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201459.5 ppb292917.0 ppb - 110.0 ppb
201552.1 ppb202023.0 ppb - 89.8 ppb
201641.3 ppb161618.0 ppb - 60.0 ppb
201751.0 ppb161626.0 ppb - 74.4 ppb
201854.0 ppb161631.2 ppb - 91.0 ppb
201953.9 ppb161621.0 ppb - 90.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.15 ppb

The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.

EPA Maximum Contaminant
Level (MCL) 80 ppb

The legal limit for the group of four trihalomethanes, established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer due to exposure to trihalomethanes.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-11FEB2014 176EAGLE17.0 ppb
2014-02-11FEB2014 GREGORY54.4 ppb
2014-02-11FEB2014 33 TEMPL22.0 ppb
2014-02-12FEB2014 172 EAGL30.5 ppb
2014-02-12FEB2014 278 CHES29.6 ppb
2014-05-29MAY2014 278 CHES31.2 ppb
2014-05-29MAY2014 GREGORY50.5 ppb
2014-05-29176 EAGLE MAY TO51.0 ppb
2014-05-292014 MAY TOTALS41.0 ppb
2014-05-29MAY TOTALS GREGO47.0 ppb
2014-05-29MAY2014 33 TEMPL41.1 ppb
2014-05-29MAY2014 176 EAGL50.5 ppb
2014-05-29MAY TOTALS CHEST31.0 ppb
2014-08-26AUG14 151CHESTNU109.7 ppb
2014-08-2633 TEMPLE AUG 2073.2 ppb
2014-08-26AUG2014 GREGORY79.3 ppb
2014-08-26AUG14 176EAGLE T110.0 ppb
2014-08-26AUG14 TEMPLE TOT73.0 ppb
2014-08-26AUG2014 176 EAGL109.8 ppb
2014-08-26AUG14 CHESTNUT T110.0 ppb
2014-08-26AUG14 GREGORY TO79.0 ppb
2014-11-05NOV14 33 TEMPLE44.4 ppb
2014-11-05NOV14 TEMPLE TOT44.0 ppb
2014-11-24NOV14 EAGLE TOTA63.0 ppb
2014-11-24NOV14 CHESTNUT T70.0 ppb
2014-11-24NOV14 278 CHESTN70.1 ppb
2014-11-24NOV14 GREGORY HA65.5 ppb
2014-11-24NOV14 176 EAGLE62.5 ppb
2014-11-24NOV14 GREGORY TO65.0 ppb
2015-02-19FEB 15 TEMPLE TO23.0 ppb
2015-02-19FEB15 CHESTNUT T32.0 ppb
2015-02-19FEB 15 278 CHEST31.9 ppb
2015-02-19FEB15 176 EAGLE40.0 ppb
2015-02-19FEB 15 GREGORY T24.0 ppb
2015-02-19FEB 15 GREGORY H24.5 ppb
2015-02-19FEB15 33 TEMPLE23.2 ppb
2015-02-19FEB15 EAGLE TOTA40.0 ppb
2015-05-14MAY2015 TEMPLE47.8 ppb
2015-05-14MAY2015 GREGORY55.4 ppb
2015-05-14MAY2015 EAGLE62.8 ppb
2015-05-14MAY2015 278 CHES56.7 ppb
2015-08-13AUG15 176 EAGLE81.1 ppb
2015-08-13AUG15 GREGORY HA82.6 ppb
2015-08-13AUG15 278 CHESTN89.8 ppb
2015-08-13AUG15 33 TEMPLE68.0 ppb
2015-11-20NOV15 278 CHESTN43.4 ppb
2015-11-20NOV15 EAGLE70.3 ppb
2015-11-21NOV15 33 TEMPLE73.6 ppb
2015-11-22NOV15 GREGORY HA71.5 ppb
2016-02-29FEB2016 GREGORY26.0 ppb
2016-02-29FEB2016 278 CHES18.0 ppb
2016-02-29FEB16 33 TEMPLE30.4 ppb
2016-02-29FEB16 176 EAGLE39.4 ppb
2016-05-252NDQT16 33 TEMPL50.5 ppb
2016-05-252NDQT16 176 EAGL55.4 ppb
2016-05-252NDQT16 GREGORY41.7 ppb
2016-05-252NDQT16 278 CHES24.5 ppb
2016-08-25AUG16 GREGORY HA52.2 ppb
2016-08-25AUG16 33 TEMPLE43.2 ppb
2016-08-29AUG16 278 CHESTN27.9 ppb
2016-08-29AUG16 176 EAGLE55.8 ppb
2016-11-18NOV16 33 TEMPLE55.3 ppb
2016-11-18NOV16 GREGORY HA48.4 ppb
2016-11-18NOV16 176 EAGLE60.0 ppb
2016-11-18NOV16 278 CHESTN32.5 ppb
2017-02-21FEB17 GREGORY HA26.0 ppb
2017-02-21FEB17 33 TEMPLE32.6 ppb
2017-02-21FEB17 176 EAGLE31.0 ppb
2017-02-21FEB17 278 CHESTN30.1 ppb
2017-05-16MAY17 EAGLE53.6 ppb
2017-05-16MAY17 CHESTNUT59.2 ppb
2017-05-16MAY17 GREGORY HA61.9 ppb
2017-05-16MAY17 TEMPLE53.9 ppb
2017-08-0817AUG 33 TEMPLE67.6 ppb
2017-08-08AUG17 GREGORY HA59.2 ppb
2017-08-09AUG17 EAGLE STRE56.6 ppb
2017-08-09AUG17 CHESTNUT S57.8 ppb
2017-11-29NOV17 33 TEMPLE55.1 ppb
2017-11-29NOV17 GREGORY HA49.7 ppb
2017-11-29NOV17 EAGLE74.4 ppb
2017-11-29NOV17 CHESTNUT47.7 ppb
2018-02-28Q1FREDONIA 18 EA45.3 ppb
2018-02-28Q1FREDONIA 18 CH31.2 ppb
2018-02-28Q1FREDONIA 18 GR42.8 ppb
2018-02-28Q1FREDONIA 18 TE40.7 ppb
2018-05-08Q2FREDONIA 18 CH39.0 ppb
2018-05-09Q2FREDONIA 18 GR41.0 ppb
2018-05-09Q2FREDONIA 18 EA50.0 ppb
2018-05-09Q2FREDONIA 18 TE40.0 ppb
2018-08-08Q318FREDONIA 3372.0 ppb
2018-08-08Q3FREDONIA 18 CH70.0 ppb
2018-08-08Q318FREDONIA 17678.0 ppb
2018-08-08Q318FREDONIA GRE91.0 ppb
2018-11-13Q418FREDONIA GRE52.0 ppb
2018-11-13Q418FREDONIA 17649.0 ppb
2018-11-13Q418 FREDONIA CH54.0 ppb
2018-11-13Q418FREDONIA 3368.0 ppb
2019-02-26Q119 FREDONIA CH21.0 ppb
2019-02-26Q119FREDONIA GRE21.0 ppb
2019-02-26Q119FREDONIA 17631.0 ppb
2019-02-26Q119FREDONIA 3323.0 ppb
2019-05-14Q219FREDONIA 3335.0 ppb
2019-05-14Q219FREDONIA GRE37.0 ppb
2019-05-14Q219FREDONIA 17650.0 ppb
2019-05-14Q219 FREDONIA CH34.0 ppb
2019-08-13Q319FREDONIA 3380.0 ppb
2019-08-13Q319FREDONIA 17668.0 ppb
2019-08-13Q319FREDONIA CHE85.0 ppb
2019-08-13Q319FREDONIA GRE90.0 ppb
2019-11-20Q419FREDONIA 17674.0 ppb
2019-11-20Q419FREDONIA 3370.0 ppb
2019-11-20Q419FREDONIA GRE76.0 ppb
2019-11-20Q419FREDONIA CHE68.0 ppb