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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

Wellborn SUD

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.

 

113

Samples

0

Samples exceeding legal limit (MCL)

90

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201223.9 ppb128ND - 102.5 ppb
201339.3 ppb1917ND - 195.0 ppb
20142.44 ppb1811ND - 33.0 ppb
20153.74 ppb2419ND - 12.9 ppb
20162.93 ppb2018ND - 5.80 ppb
20172.57 ppb2017ND - 5.30 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
2012-06-18AB93072ND
2012-06-18AB93071ND
2012-06-18AB93078ND
2012-06-18AB93068ND
2012-06-18AB930748.30 ppb
2012-06-18AB930693.10 ppb
2012-06-18AB930930.500 ppb
2012-09-12AC0083965.0 ppb
2012-11-15121157800158.8 ppb
2012-11-15121157800245.4 ppb
2012-11-1512115780032.60 ppb
2012-11-151211578004102.5 ppb
2013-02-06130222800685.2 ppb
2013-02-06130222800721.6 ppb
2013-02-0613022280082.40 ppb
2013-02-06130222800955.2 ppb
2013-06-12Q13021830079.96 ppb
2013-06-12Q13021830086.31 ppb
2013-06-12Q13021830091.03 ppb
2013-06-12Q130218301026.7 ppb
2013-09-23Q13078890054.75 ppb
2013-09-23Q130788900749.1 ppb
2013-09-23Q13078890084.62 ppb
2013-09-23Q1307889009ND
2013-09-23Q130788901080.6 ppb
2013-12-12Q1317624005132.0 ppb
2013-12-12Q131762400667.8 ppb
2013-12-12Q13176240071.75 ppb
2013-12-12Q1317624008195.0 ppb
2013-12-12Q1317624030ND
2013-12-12Q13176240221.96 ppb
2014-02-13AC42882ND
2014-02-13AC428791.10 ppb
2014-02-13AC428801.000 ppb
2014-02-13AC42883ND
2014-04-07AC494760.600 ppb
2014-04-07AC494742.00 ppb
2014-04-07AC496221.10 ppb
2014-04-07AC496031.000 ppb
2014-04-07AC496051.000 ppb
2014-04-07AC496021.000 ppb
2014-09-10AC6659133.0 ppb
2014-09-10AC66526ND
2014-09-10AC66518ND
2014-09-10AC66517ND
2014-12-16AC75090ND
2014-12-16AC750891.000 ppb
2014-12-16AC75075ND
2014-12-16AC750911.10 ppb
2015-03-24AC85864ND
2015-03-24AC8587412.0 ppb
2015-03-24AC858722.00 ppb
2015-03-24AC858843.60 ppb
2015-03-24AC85862ND
2015-03-24AC858503.30 ppb
2015-03-24AC858443.10 ppb
2015-03-24AC858453.10 ppb
2015-03-24AC858382.70 ppb
2015-05-27AC93421ND
2015-05-27AC934723.30 ppb
2015-05-27AC934885.60 ppb
2015-05-27AC934893.70 ppb
2015-06-18AC965726.00 ppb
2015-09-30AD091287.40 ppb
2015-09-30AD0909012.9 ppb
2015-09-30AD090912.70 ppb
2015-09-30AD09089ND
2015-09-30AD0909310.1 ppb
2015-12-07AD15734ND
2015-12-07AD157052.90 ppb
2015-12-07AD157043.10 ppb
2015-12-07AD156971.10 ppb
2015-12-07AD156961.20 ppb
2016-03-09AD279355.80 ppb
2016-03-09AD279311.10 ppb
2016-03-09AD27937ND
2016-03-09AD279331.60 ppb
2016-03-09AD278611.80 ppb
2016-03-09AD278592.90 ppb
2016-03-09AD278631.30 ppb
2016-03-09AD278601.10 ppb
2016-06-14AD403985.50 ppb
2016-06-14AD403961.90 ppb
2016-06-14AD404135.10 ppb
2016-06-14AD404025.80 ppb
2016-09-30AD521611.60 ppb
2016-09-30AD521621.50 ppb
2016-09-30AD521594.80 ppb
2016-09-30AD521634.70 ppb
2016-12-08AD613874.80 ppb
2016-12-08AD613882.50 ppb
2016-12-08AD61383ND
2016-12-08AD613894.70 ppb
2017-03-07AD737623.30 ppb
2017-03-07AD737643.10 ppb
2017-03-07AD737015.30 ppb
2017-03-07AD736994.30 ppb
2017-03-07AD737021.10 ppb
2017-03-07AD737005.00 ppb
2017-05-22AD850151.80 ppb
2017-05-22AD850161.10 ppb
2017-05-22AD85022ND
2017-05-22AD850145.20 ppb
2017-09-19AD967661.60 ppb
2017-09-19AD967671.60 ppb
2017-09-19AD96768ND
2017-09-19AD967633.20 ppb
2017-11-21AE05566ND
2017-11-21AE055701.10 ppb
2017-11-21AE055484.50 ppb
2017-11-21AE055502.70 ppb
2017-11-21AE055491.50 ppb
2017-11-21AE055474.90 ppb