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EWG's Tap Water Database — 2021 UPDATE

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Total trihalomethanes (TTHMs)

Battle Creek - Verona System

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

 

142

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201412.0 ppb3814ND - 57.8 ppb
201541.0 ppb1131.0 ppb - 52.0 ppb
201654.0 ppb9929.0 ppb - 57.0 ppb
201751.5 ppb9941.3 ppb - 51.5 ppb
201817.2 ppb4019ND - 61.2 ppb
201917.9 ppb4524ND - 47.2 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
2014-02-20LLF0998712.0 ppb
2014-02-20LLF09991ND
2014-02-20LLF09985ND
2014-02-20LLF09986ND
2014-02-20LLF09988ND
2014-02-20LLF09990ND
2014-02-20LLF09989ND
2014-02-20LLF0998431.3 ppb
2014-02-20LLF0998330.9 ppb
2014-05-08LLF174667.60 ppb
2014-05-08LLF17464ND
2014-05-08LLF17470ND
2014-05-08LLF17467ND
2014-05-08LLF17468ND
2014-05-08LLF17469ND
2014-05-08LLF1747131.5 ppb
2014-05-08LLF1747240.4 ppb
2014-05-08LLF17465ND
2014-08-28LLF35496ND
2014-08-28LLF35497ND
2014-08-28LLF35498ND
2014-08-28LLF35499ND
2014-08-28LLF3550445.4 ppb
2014-08-28LLF35502ND
2014-08-28LLF3550012.0 ppb
2014-08-28LLF35501ND
2014-08-28LLF3550344.7 ppb
2014-08-29LLF3593629.3 ppb
2014-08-29LLF3593557.8 ppb
2014-11-04LLF45362ND
2014-11-04LLF45364ND
2014-11-04LLF4536514.0 ppb
2014-11-04LLF45366ND
2014-11-04LLF45367ND
2014-11-04LLF45363ND
2014-11-04LLF45368ND
2014-11-04LLF4536948.7 ppb
2014-11-04LLF4537051.6 ppb
2015-06-0141.0 ppb*
2016-02-2329.4 ppb
2016-02-2336.1 ppb
2016-05-0352.0 ppb
2016-05-0343.3 ppb
2016-06-0154.0 ppb*
2016-08-1752.0 ppb
2016-08-1757.0 ppb
2016-11-0749.0 ppb
2016-11-0749.1 ppb
2017-02-0631.9 ppb
2017-02-2139.1 ppb
2017-05-2357.9 ppb
2017-05-2338.6 ppb
2017-06-0151.5 ppb*
2017-08-1552.6 ppb
2017-08-1545.4 ppb
2017-11-0655.6 ppb
2017-11-0651.2 ppb
2018-02-12LLH6547731.6 ppb
2018-02-12LLH6547835.9 ppb
2018-02-12LLH65473ND
2018-02-12LLH65474ND
2018-02-12LLH65475ND
2018-02-12LLH6547611.0 ppb
2018-02-1235.9 ppb
2018-02-1231.6 ppb
2018-05-07LLH79224ND
2018-05-07LLH79222ND
2018-05-07LLH79223ND
2018-05-07LLH7922516.0 ppb
2018-05-07LLH7922649.8 ppb
2018-05-07LLH7922744.0 ppb
2018-05-0749.8 ppb
2018-05-0744.0 ppb
2018-08-20LLI00269ND
2018-08-20LLI00272ND
2018-08-20LLI00274ND
2018-08-20LLI00271ND
2018-08-20LLI00273ND
2018-08-20LLI0027613.0 ppb
2018-08-20LLI0026755.6 ppb
2018-08-20LLI0026461.2 ppb
2018-08-20LLI00270ND
2018-08-20LLI00275ND
2018-08-2061.2 ppb
2018-08-2055.6 ppb
2018-11-19LLI1622211.0 ppb
2018-11-19LLI16218ND
2018-11-19LLI16219ND
2018-11-19LLI1622431.5 ppb
2018-11-19LLI16221ND
2018-11-19LLI16220ND
2018-11-19LLI1622327.8 ppb
2018-12-17LLI1977220.0 ppb
2018-12-17LLI19773ND
2018-12-17LLI19776ND
2018-12-17LLI19774ND
2018-12-17LLI19775ND
2019-02-04LLI24177ND
2019-02-04LLI24179ND
2019-02-04LLI24178ND
2019-02-04LLI2418113.0 ppb
2019-02-04LLI24180ND
2019-02-20LLI2647428.8 ppb
2019-02-20LLI2647332.0 ppb
2019-02-2032.0 ppb
2019-02-2028.8 ppb
2019-05-06LLI36264ND
2019-05-06LLI36268ND
2019-05-06LLI36270ND
2019-05-06LLI36265ND
2019-05-06LLI36271ND
2019-05-06LLI36267ND
2019-05-06LLI3626913.0 ppb
2019-05-06LLI36266ND
2019-05-06LLI3627240.8 ppb
2019-05-06LLI3627339.5 ppb
2019-05-0640.8 ppb
2019-05-0639.5 ppb
2019-08-05LLI53800ND
2019-08-05LLI5380833.5 ppb
2019-08-05LLI5380547.2 ppb
2019-08-05LLI5380547.2 ppb
2019-08-05LLI53804ND
2019-08-05LLI53801ND
2019-08-05LLI5380315.0 ppb
2019-08-05LLI5380547.2 ppb
2019-08-05LLI5380547.2 ppb
2019-08-05LLI53802ND
2019-08-0547.2 ppb
2019-08-0533.5 ppb
2019-11-07LLI75746ND
2019-11-07LLI7575434.5 ppb
2019-11-07LLI7575339.9 ppb
2019-11-07LLI75747ND
2019-11-07LLI7575016.0 ppb
2019-11-07LLI75748ND
2019-11-07LLI75749ND
2019-11-0739.9 ppb
2019-11-20LLI7824425.5 ppb
2019-11-2025.5 ppb
2019-12-04LLI80939ND
2019-12-04LLI80940ND

* Sample result is taken from the system's CCR report.