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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

West Hwy 80 Ark Road WS

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

 

196

Samples

0

Samples exceeding legal limit (MCL)

168

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.16 ppb3632ND - 9.84 ppb
20152.46 ppb32321.15 ppb - 8.04 ppb
20160.816 ppb3224ND - 2.66 ppb
20171.78 ppb3226ND - 7.80 ppb
20187.10 ppb32321.50 ppb - 17.1 ppb
20193.19 ppb3230ND - 9.30 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
2014-02-1812789512.40 ppb
2014-02-1812789524.61 ppb
2014-02-1812789534.39 ppb
2014-02-1812789542.26 ppb
2014-02-1812789512.40 ppb
2014-02-1812789524.61 ppb
2014-02-1812789534.39 ppb
2014-02-1812789542.26 ppb
2014-05-1513022731.83 ppb
2014-05-1513022742.91 ppb
2014-05-1513022752.19 ppb
2014-05-1513022761.48 ppb
2014-05-1513022731.83 ppb
2014-05-1513022742.91 ppb
2014-05-1513022752.19 ppb
2014-05-1513022761.48 ppb
2014-08-04AD94924ND
2014-08-04AD94924ND
2014-08-11AD95313ND
2014-08-11AD95313ND
2014-08-2113286404.76 ppb
2014-08-2113286419.61 ppb
2014-08-2113286429.84 ppb
2014-08-2113286433.78 ppb
2014-08-2113286404.76 ppb
2014-08-2113286419.61 ppb
2014-08-2113286429.84 ppb
2014-08-2113286433.78 ppb
2014-11-2513531111.49 ppb
2014-11-2513531122.27 ppb
2014-11-2513531131.63 ppb
2014-11-2513531141.45 ppb
2014-11-2513531111.49 ppb
2014-11-2513531122.27 ppb
2014-11-2513531131.63 ppb
2014-11-2513531141.45 ppb
2015-02-1813738532.08 ppb
2015-02-1813738542.52 ppb
2015-02-1813738552.47 ppb
2015-02-1813738562.35 ppb
2015-02-1813738532.08 ppb
2015-02-1813738542.52 ppb
2015-02-1813738552.47 ppb
2015-02-1813738562.35 ppb
2015-05-1913962142.14 ppb
2015-05-1913962151.37 ppb
2015-05-1913962161.21 ppb
2015-05-1913962171.80 ppb
2015-05-1913962142.14 ppb
2015-05-1913962151.37 ppb
2015-05-1913962161.21 ppb
2015-05-1913962171.80 ppb
2015-08-0314158971.15 ppb
2015-08-0314158981.17 ppb
2015-08-0314158991.19 ppb
2015-08-0314159002.38 ppb
2015-08-0314158971.15 ppb
2015-08-0314158981.17 ppb
2015-08-0314158991.19 ppb
2015-08-0314159002.38 ppb
2015-11-1814456728.04 ppb
2015-11-1814456733.12 ppb
2015-11-1814456728.04 ppb
2015-11-1814456733.12 ppb
2015-11-1914456703.31 ppb
2015-11-1914456713.09 ppb
2015-11-1914456703.31 ppb
2015-11-1914456713.09 ppb
2016-02-1114673091.49 ppb
2016-02-1114673101.41 ppb
2016-02-111467311ND
2016-02-111467312ND
2016-02-1114673091.49 ppb
2016-02-1114673101.41 ppb
2016-02-111467311ND
2016-02-111467312ND
2016-05-0514900780.360 ppb
2016-05-051490079ND
2016-05-0514900800.300 ppb
2016-05-0514900810.560 ppb
2016-05-0514900780.360 ppb
2016-05-051490079ND
2016-05-0514900800.300 ppb
2016-05-0514900810.560 ppb
2016-08-0915147890.470 ppb
2016-08-0915147901.61 ppb
2016-08-091514797ND
2016-08-0915147980.390 ppb
2016-08-0915147890.470 ppb
2016-08-0915147901.61 ppb
2016-08-091514797ND
2016-08-0915147980.390 ppb
2016-11-0115379630.600 ppb
2016-11-0115379640.570 ppb
2016-11-0115379712.66 ppb
2016-11-0115379722.64 ppb
2016-11-0115379630.600 ppb
2016-11-0115379640.570 ppb
2016-11-0115379712.66 ppb
2016-11-0115379722.64 ppb
2017-02-09352945480230.470 ppb
2017-02-09352945480241.50 ppb
2017-02-09352945480250.660 ppb
2017-02-09352945480260.370 ppb
2017-02-09352945480230.470 ppb
2017-02-09352945480241.50 ppb
2017-02-09352945480250.660 ppb
2017-02-09352945480260.370 ppb
2017-05-0535310618031ND
2017-05-05353106180321.10 ppb
2017-05-05353106180330.650 ppb
2017-05-0535310618034ND
2017-05-0535310618031ND
2017-05-05353106180321.10 ppb
2017-05-05353106180330.650 ppb
2017-05-0535310618034ND
2017-08-14353312850091.10 ppb
2017-08-14353312850102.80 ppb
2017-08-14353312850113.20 ppb
2017-08-14353312850091.10 ppb
2017-08-14353312850102.80 ppb
2017-08-14353312850113.20 ppb
2017-08-2935333221001ND
2017-08-2935333221001ND
2017-11-09353475490012.10 ppb
2017-11-09353475490025.10 ppb
2017-11-09353475490037.80 ppb
2017-11-09353475490041.70 ppb
2017-11-09353475490012.10 ppb
2017-11-09353475490025.10 ppb
2017-11-09353475490037.80 ppb
2017-11-09353475490041.70 ppb
2018-02-21353761480011.60 ppb
2018-02-21353761480024.70 ppb
2018-02-21353761480031.90 ppb
2018-02-21353761480041.50 ppb
2018-02-21353761480011.60 ppb
2018-02-21353761480024.70 ppb
2018-02-21353761480031.90 ppb
2018-02-21353761480041.50 ppb
2018-05-21353939280014.50 ppb
2018-05-213539392800211.6 ppb
2018-05-21353939280039.40 ppb
2018-05-21353939280041.70 ppb
2018-05-21353939280014.50 ppb
2018-05-213539392800211.6 ppb
2018-05-21353939280039.40 ppb
2018-05-21353939280041.70 ppb
2018-08-15354116160015.00 ppb
2018-08-153541161600213.2 ppb
2018-08-153541161600312.0 ppb
2018-08-15354116160041.80 ppb
2018-08-15354116160015.00 ppb
2018-08-153541161600213.2 ppb
2018-08-153541161600312.0 ppb
2018-08-15354116160041.80 ppb
2018-11-013542822500517.1 ppb
2018-11-013542822500614.8 ppb
2018-11-01354282250071.70 ppb
2018-11-013542822500811.1 ppb
2018-11-013542822500517.1 ppb
2018-11-013542822500614.8 ppb
2018-11-01354282250071.70 ppb
2018-11-013542822500811.1 ppb
2019-02-18354493600013.20 ppb
2019-02-18354493600028.20 ppb
2019-02-18354493600037.00 ppb
2019-02-18354493600041.20 ppb
2019-02-18354493600013.20 ppb
2019-02-18354493600028.20 ppb
2019-02-18354493600037.00 ppb
2019-02-18354493600041.20 ppb
2019-05-15354693190013.60 ppb
2019-05-15354693190021.20 ppb
2019-05-15354693190039.30 ppb
2019-05-15354693190041.30 ppb
2019-05-15354693190013.60 ppb
2019-05-15354693190021.20 ppb
2019-05-15354693190039.30 ppb
2019-05-15354693190041.30 ppb
2019-08-01354870220013.30 ppb
2019-08-01354870220020.820 ppb
2019-08-01354870220036.50 ppb
2019-08-01354870220040.500 ppb
2019-08-01354870220013.30 ppb
2019-08-01354870220020.820 ppb
2019-08-01354870220036.50 ppb
2019-08-01354870220040.500 ppb
2019-11-19355140870012.20 ppb
2019-11-19355140870020.560 ppb
2019-11-19355140870032.10 ppb
2019-11-1935514087004ND
2019-11-19355140870012.20 ppb
2019-11-19355140870020.560 ppb
2019-11-19355140870032.10 ppb
2019-11-1935514087004ND