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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Roxbury Water Company

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

114

Samples

0

Samples exceeding legal limit (MCL)

45

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.0835 ppb266ND - 1.02 ppb
20150.761 ppb1716ND - 5.47 ppb
20160.721 ppb1716ND - 3.10 ppb
20170.805 ppb2119ND - 3.60 ppb
20181.40 ppb1716ND - 10.00 ppb
20191.48 ppb1612ND - 11.7 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-09L4861831-4ND
2014-01-09L4861831-3ND
2014-01-09L4861831-2ND
2014-01-09L4861831-1ND
2014-01-16L4861829-4ND
2014-01-16L4861829-50.720 ppb
2014-01-16L4861829-10.1000 ppb
2014-01-16L4861829-60.0600 ppb
2014-01-16L4861829-3ND
2014-04-03L4975169-4ND
2014-04-03L4975169-3ND
2014-04-03L4975169-2ND
2014-04-03L4975169-1ND
2014-04-10L1664237-3ND
2014-04-10L1664237-41.02 ppb
2014-04-10L1664237-10.140 ppb
2014-04-10L1664237-50.130 ppb
2014-04-10L1664237-2ND
2014-07-03L5101859-4ND
2014-07-03L5101859-3ND
2014-07-03L5101859-2ND
2014-07-03L5101859-1ND
2014-10-02L5240190-4ND
2014-10-02L5240190-3ND
2014-10-02L5240190-2ND
2014-10-02L5240190-1ND
2015-01-08L5356735-40.140 ppb
2015-01-08L5356735-30.790 ppb
2015-01-08L5356735-20.940 ppb
2015-01-08L5356735-10.210 ppb
2015-01-22L5417699-1ND
2015-04-02L5489246-10.160 ppb
2015-04-02L5489246-40.850 ppb
2015-04-02L5489246-31.27 ppb
2015-04-02L5489246-20.250 ppb
2015-07-02L5692464-40.240 ppb
2015-07-02L5692464-30.230 ppb
2015-07-02L5692464-25.47 ppb
2015-07-02L5692464-10.300 ppb
2015-10-01L5808111-40.170 ppb
2015-10-01L5808111-30.490 ppb
2015-10-01L5808111-21.15 ppb
2015-10-01L5808111-10.280 ppb
2016-01-07L5966720-40.120 ppb
2016-01-07L5966720-30.560 ppb
2016-01-07L5966720-20.990 ppb
2016-01-07L5966720-10.180 ppb
2016-01-07L6008973-1ND
2016-04-07L6125592-40.1000 ppb
2016-04-07L6125592-30.600 ppb
2016-04-07L6125592-21.80 ppb
2016-04-07L6125592-10.200 ppb
2016-07-07L6313405-40.200 ppb
2016-07-07L6313405-30.500 ppb
2016-07-07L6313405-23.10 ppb
2016-07-07L6313405-10.400 ppb
2016-10-06L6466320-40.200 ppb
2016-10-06L6466320-30.800 ppb
2016-10-06L6466320-22.20 ppb
2016-10-06L6466320-10.300 ppb
2017-01-05L6597241-40.1000 ppb
2017-01-05L6597241-30.600 ppb
2017-01-05L6597241-22.50 ppb
2017-01-05L6597241-10.200 ppb
2017-01-05L6597239-3ND
2017-01-05L6597239-40.800 ppb
2017-01-05L6597239-10.1000 ppb
2017-01-05L6597239-50.1000 ppb
2017-01-05L6597239-2ND
2017-04-06L6718940-40.1000 ppb
2017-04-06L6718940-30.700 ppb
2017-04-06L6718940-23.60 ppb
2017-04-06L6718940-10.200 ppb
2017-07-06L6853840-40.1000 ppb
2017-07-06L6853840-30.300 ppb
2017-07-06L6853840-23.60 ppb
2017-07-06L6853840-10.300 ppb
2017-10-05L6949246-40.200 ppb
2017-10-05L6949246-30.500 ppb
2017-10-05L6949246-22.60 ppb
2017-10-05L6949246-10.300 ppb
2018-01-11L6981217-40.200 ppb
2018-01-11L6981217-30.900 ppb
2018-01-11L6981217-22.90 ppb
2018-01-11L6981217-10.200 ppb
2018-01-11L6949245-1ND
2018-04-05L7007350-40.200 ppb
2018-04-05L7007350-30.600 ppb
2018-04-05L7007350-22.60 ppb
2018-04-05L7007350-10.200 ppb
2018-07-05L7038526-40.200 ppb
2018-07-05L7038526-30.300 ppb
2018-07-05L7038526-210.00 ppb
2018-07-05L7038526-10.400 ppb
2018-10-04L7070077-40.200 ppb
2018-10-04L7070077-31.000 ppb
2018-10-04L7070077-23.40 ppb
2018-10-04L7070077-10.500 ppb
2019-01-1142659801ND
2019-01-11426599011.10 ppb
2019-01-114266000111.7 ppb
2019-01-1142660101ND
2019-04-0843718701ND
2019-04-08437188011.000 ppb
2019-04-08437189011.60 ppb
2019-04-0843719001ND
2019-07-11452175010.600 ppb
2019-07-11452176011.50 ppb
2019-07-11452177010.900 ppb
2019-07-11452178010.700 ppb
2019-10-08469529010.900 ppb
2019-10-08469530011.90 ppb
2019-10-08469531010.700 ppb
2019-10-08469532011.000 ppb