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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Hazardville 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

 

137

Samples

0

Samples exceeding legal limit (MCL)

83

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.812 ppb2612ND - 5.00 ppb
20150.995 ppb2112ND - 4.20 ppb
20161.44 ppb2216ND - 6.10 ppb
20171.32 ppb2516ND - 6.80 ppb
20181.84 ppb2214ND - 8.00 ppb
20191.35 ppb2113ND - 9.10 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
2014-01-27SB83819-04-VOCND
2014-01-27SB83819-06-VOC1.60 ppb
2014-01-27SB83819-07-VOCND
2014-01-27SB83819-08-VOCND
2014-01-27SB83819-09-VOCND
2014-04-21SB87957-07-VOC0.500 ppb
2014-04-21SB87957-10-VOC1.80 ppb
2014-04-21SB87957-11-VOCND
2014-04-21SB87957-12-VOCND
2014-04-21SB87957-13-VOCND
2014-04-21SB87957-14-VOCND
2014-06-03SB90449-01-VOC0.510 ppb
2014-06-03SB90449-02-VOC0.710 ppb
2014-06-03SB90449-03-VOCND
2014-06-03SB90449-04-VOCND
2014-06-03SB90449-05-VOCND
2014-07-07SB92334-09-VOCND
2014-07-21SB93129-04-VOC2.50 ppb
2014-07-21SB93129-05-VOC3.30 ppb
2014-07-21SB93129-06-VOC0.800 ppb
2014-07-21SB93129-07-VOC1.20 ppb
2014-10-14SB97999-04-VOCND
2014-10-27SB98715-04-VOC5.00 ppb
2014-10-27SB98715-05-VOC1.20 ppb
2014-10-27SB98715-06-VOCND
2014-10-27SB98715-07-VOC2.00 ppb
2015-01-21SC02713-04-VOC0.800 ppb
2015-01-21SC02713-02-VOCND
2015-01-23SC02713-01-VOC2.00 ppb
2015-01-23SC02713-03-VOCND
2015-02-11SC03254-05-VOCND
2015-04-21SC06241-11-VOCND
2015-04-21SC06241-09-VOC0.900 ppb
2015-04-21SC06241-08-VOC1.60 ppb
2015-04-21SC06241-10-VOCND
2015-04-21SC06241-06-VOCND
2015-07-15SC10036-04-VOCND
2015-07-27SC10482-07-VOC0.900 ppb
2015-07-27SC10482-05-VOC2.80 ppb
2015-07-27SC10482-08-VOC2.00 ppb
2015-07-27SC10482-06-VOC0.700 ppb
2015-09-08SC12125-03-VOCND
2015-10-20SC13895-08-VOCND
2015-10-26SC14122-05-VOC4.20 ppb
2015-10-26SC14122-07-VOC1.20 ppb
2015-10-26SC14122-04-VOC2.80 ppb
2015-10-26SC14122-06-VOC1.000 ppb
2016-01-25SC17491-04-VOC1.60 ppb
2016-01-25SC17491-06-VOC0.600 ppb
2016-01-25SC17491-07-VOC0.600 ppb
2016-01-25SC17491-05-VOC3.30 ppb
2016-01-25SC17491-09-VOCND
2016-04-18SC20279-09-VOCND
2016-04-25SC20556-04-VOC3.30 ppb
2016-04-25SC20556-05-VOC0.600 ppb
2016-04-25SC20556-06-VOC0.800 ppb
2016-04-25SC20556-07-VOC3.00 ppb
2016-04-25SC20556-08-VOCND
2016-07-21SC23917-03-VOCND
2016-07-21SC23917-02-VOCND
2016-07-25SC24001-04-VOC3.40 ppb
2016-07-25SC24001-05-VOC1.40 ppb
2016-07-25SC24001-06-VOC1.000 ppb
2016-07-25SC24001-07-VOC1.000 ppb
2016-10-24SC27464-05-VOC0.900 ppb
2016-10-24SC27464-06-VOC1.000 ppb
2016-10-24SC27464-07-VOC3.00 ppb
2016-10-24SC27464-04-VOC6.10 ppb
2016-10-24SC27464-08-VOCND
2017-01-09SC30330-15-VOCND
2017-01-23SC30880-04-VOC2.40 ppb
2017-01-23SC30880-05-VOCND
2017-01-23SC30880-06-VOC0.600 ppb
2017-01-23SC30880-07-VOC1.60 ppb
2017-04-04BX98286VOC1ND
2017-04-25BY09563TTHM1.40 ppb
2017-04-25BY09564TTHM3.10 ppb
2017-04-25BY09565TTHMND
2017-04-25BY09566TTHM0.560 ppb
2017-06-26BY48752VOC1ND
2017-06-26BY48750VOC10.860 ppb
2017-06-27BY48751VOC1ND
2017-06-27BY48749VOC10.660 ppb
2017-06-27BY48754VOC1ND
2017-07-25BY72099TTHM2.70 ppb
2017-07-25BY72100TTHM5.50 ppb
2017-07-25BY72101TTHM0.850 ppb
2017-07-25BY72102TTHM0.920 ppb
2017-07-25BY72105VOC1ND
2017-10-17BZ22379VOC1ND
2017-10-23BZ26458TTHM3.10 ppb
2017-10-23BZ26459TTHM6.80 ppb
2017-10-23BZ26460TTHM0.940 ppb
2017-10-23BZ26461TTHM0.970 ppb
2018-01-03BZ68303VOC1ND
2018-01-22BZ78627TTHM1.40 ppb
2018-01-22BZ78628TTHM3.60 ppb
2018-01-22BZ78629TTHMND
2018-01-22BZ78630TTHMND
2018-04-03CA12985VOC1ND
2018-04-23CA35126TTHM1.70 ppb
2018-04-23CA35127TTHM4.00 ppb
2018-04-23CA35128TTHM2.10 ppb
2018-04-23CA35129TTHM0.630 ppb
2018-07-02CA82194ND
2018-07-02CA82195ND
2018-07-02CA82195VOC1ND
2018-07-23CA967623.10 ppb
2018-07-23CA967638.00 ppb
2018-07-23CA967643.00 ppb
2018-07-23CA967651.70 ppb
2018-10-10CB69247ND
2018-10-22CB803922.60 ppb
2018-10-22CB803936.90 ppb
2018-10-22CB803940.690 ppb
2018-10-22CB803951.000 ppb
2019-01-07CC25226ND
2019-01-21CC326301.50 ppb
2019-01-21CC326311.10 ppb
2019-01-21CC326320.640 ppb
2019-01-21CC32633ND
2019-04-02CC79783ND
2019-04-22CC99840ND
2019-04-22CC998413.70 ppb
2019-04-22CC998420.580 ppb
2019-04-22CC998430.730 ppb
2019-07-09CD52639ND
2019-07-09CD52640ND
2019-07-22CD632550.800 ppb
2019-07-22CD632569.10 ppb
2019-07-22CD632572.50 ppb
2019-07-22CD632582.00 ppb
2019-10-08CE28924ND
2019-10-21CE457052.20 ppb
2019-10-21CE457062.20 ppb
2019-10-21CE45707ND
2019-10-21CE457081.40 ppb