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EWG's Tap Water Database — 2021 UPDATE

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Total trihalomethanes (TTHMs)

City of Jasper

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.556 ppb166ND - 2.50 ppb
20150.144 ppb162ND - 1.20 ppb
20160.538 ppb165ND - 4.00 ppb
20170.888 ppb167ND - 5.70 ppb
20180.144 ppb162ND - 1.20 ppb
20190.506 ppb163ND - 4.60 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
2014-03-04AC454632.50 ppb
2014-03-04AC454671.30 ppb
2014-03-04AC45464ND
2014-03-04AC45461ND
2014-06-17AC571811.10 ppb
2014-06-17AC57158ND
2014-06-17AC57159ND
2014-06-17AC571771.20 ppb
2014-09-16AC67146ND
2014-09-16AC671541.50 ppb
2014-09-16AC67160ND
2014-09-16AC671441.30 ppb
2014-12-18AC75433ND
2014-12-18AC75438ND
2014-12-18AC75442ND
2014-12-18AC75441ND
2015-02-02AC78734ND
2015-02-02AC78681ND
2015-02-02AC78685ND
2015-02-02AC78683ND
2015-06-10AC95384ND
2015-06-10AC95388ND
2015-06-10AC95393ND
2015-06-10AC95387ND
2015-07-16AC998821.10 ppb
2015-07-16AC99877ND
2015-07-16AC99885ND
2015-07-16AC998921.20 ppb
2015-11-23AD14393ND
2015-11-23AD14394ND
2015-11-23AD14399ND
2015-11-23AD14374ND
2016-02-16AD236121.000 ppb
2016-02-16AD23613ND
2016-02-16AD23619ND
2016-02-16AD23611ND
2016-05-09AD35816ND
2016-05-09AD35803ND
2016-05-09AD357941.20 ppb
2016-05-09AD358141.20 ppb
2016-09-07AD48354ND
2016-09-07AD48346ND
2016-09-07AD483664.00 ppb
2016-09-07AD48361ND
2016-10-11AD52970ND
2016-10-11AD52973ND
2016-10-11AD52954ND
2016-10-11AD529551.20 ppb
2017-03-07AD73684ND
2017-03-07AD73683ND
2017-03-07AD73685ND
2017-03-07AD73688ND
2017-04-03AD782411.40 ppb
2017-04-03AD78239ND
2017-04-03AD782431.50 ppb
2017-04-03AD782421.60 ppb
2017-07-17AD894531.50 ppb
2017-07-17AD894551.30 ppb
2017-07-17AD89454ND
2017-07-17AD89451ND
2017-10-10AE00083ND
2017-10-10AE00088ND
2017-10-10AE000805.70 ppb
2017-10-10AE000791.20 ppb
2018-02-13AE13530ND
2018-02-13AE13532ND
2018-02-13AE13531ND
2018-02-13AE13533ND
2018-05-21AE26992ND
2018-05-21AE269941.20 ppb
2018-05-21AE26993ND
2018-05-21AE26995ND
2018-07-18AE33781ND
2018-07-18AE33765ND
2018-07-18AE33783ND
2018-07-18AE337841.10 ppb
2018-10-15AE43418ND
2018-10-15AE43417ND
2018-10-15AE43419ND
2018-10-15AE43422ND
2019-02-19AE548201.000 ppb
2019-02-19AE54824ND
2019-02-19AE54821ND
2019-02-19AE54823ND
2019-04-02AE60818ND
2019-04-02AE60814ND
2019-04-02AE60815ND
2019-04-02AE60816ND
2019-09-16AE83510ND
2019-09-16AE835174.60 ppb
2019-09-16AE835152.50 ppb
2019-09-16AE83514ND
2019-11-18AE89530ND
2019-11-18AE89525ND
2019-11-18AE89532ND
2019-11-18AE89529ND