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EWG's Tap Water Database — 2019 UPDATE

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Chloroform

City of Kerrville

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.

 

138

Samples

0

Samples exceeding legal limit (MCL)

119

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201219.0 ppb2722ND - 69.9 ppb
201322.1 ppb23235.80 ppb - 53.0 ppb
201430.4 ppb17172.50 ppb - 91.0 ppb
201522.5 ppb2220ND - 122.0 ppb
201625.3 ppb2118ND - 69.8 ppb
201716.1 ppb2819ND - 49.1 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
2012-01-1812014250049.60 ppb
2012-01-1812014250057.60 ppb
2012-01-1812014250065.20 ppb
2012-01-1812014250076.80 ppb
2012-01-1812014250085.60 ppb
2012-01-1812014250094.80 ppb
2012-04-04120411700519.8 ppb
2012-04-04120411700728.4 ppb
2012-04-04120411700818.8 ppb
2012-04-041204117009ND
2012-04-0412041170103.20 ppb
2012-04-04120411701116.1 ppb
2012-04-04120411701210.2 ppb
2012-07-25120795100526.1 ppb
2012-07-25120795100724.6 ppb
2012-07-25120795100869.9 ppb
2012-07-251207951009ND
2012-07-251207951010ND
2012-07-25120795101159.0 ppb
2012-07-25120795101246.4 ppb
2012-10-04121022801123.8 ppb
2012-10-04121022801269.1 ppb
2012-10-041210228013ND
2012-10-0412102280149.40 ppb
2012-10-04121022801513.3 ppb
2012-10-04121022801636.0 ppb
2012-10-041210228005ND
2013-01-23AC085198.90 ppb
2013-01-23AC0852120.0 ppb
2013-01-23AC085226.80 ppb
2013-01-23AC085188.20 ppb
2013-01-23AC085155.80 ppb
2013-01-23AC0852013.7 ppb
2013-04-11AC1639911.8 ppb
2013-04-11AC1640427.9 ppb
2013-04-11AC1640323.9 ppb
2013-04-11AC1640612.9 ppb
2013-04-11AC1640513.5 ppb
2013-04-11AC1640223.7 ppb
2013-07-29AC2610422.0 ppb
2013-07-29AC2602329.8 ppb
2013-07-29AC2602239.8 ppb
2013-07-29AC2602436.6 ppb
2013-07-29AC2602141.5 ppb
2013-07-29AC2604917.0 ppb
2013-07-29AC2605038.4 ppb
2013-10-17AC3236523.5 ppb
2013-10-17AC3236418.8 ppb
2013-10-17AC3236710.6 ppb
2013-10-17AC3236653.0 ppb
2014-02-10AC4188415.1 ppb
2014-02-10AC418856.50 ppb
2014-02-10AC418862.50 ppb
2014-02-10AC4188716.0 ppb
2014-04-07AC4959613.5 ppb
2014-04-07AC4959517.1 ppb
2014-04-07AC4962320.3 ppb
2014-05-28AC5537234.6 ppb
2014-07-16AC5984142.0 ppb
2014-07-16AC5989963.7 ppb
2014-07-16AC5987118.9 ppb
2014-07-16AC5990091.0 ppb
2014-07-16AC5986915.3 ppb
2014-10-15AC6978350.0 ppb
2014-10-15AC6977928.8 ppb
2014-10-15AC6978437.1 ppb
2014-10-15AC6977844.3 ppb
2015-01-28AC781179.90 ppb
2015-01-28AC781188.30 ppb
2015-01-28AC781296.90 ppb
2015-01-28AC7811613.3 ppb
2015-04-15AC88380ND
2015-04-15AC8834212.0 ppb
2015-04-15AC8834011.4 ppb
2015-04-15AC8833919.6 ppb
2015-04-15AC8834111.0 ppb
2015-07-20AD00203122.0 ppb
2015-07-20AD00201ND
2015-07-20AD0007654.2 ppb
2015-07-20AD0007831.4 ppb
2015-07-20AD0008537.1 ppb
2015-07-20AD0008116.4 ppb
2015-08-14AD0443015.0 ppb
2015-08-14AD0442821.0 ppb
2015-08-14AD0443220.0 ppb
2015-10-13AD1043917.8 ppb
2015-10-13AD1042921.4 ppb
2015-10-13AD104316.70 ppb
2015-10-13AD1043039.9 ppb
2016-02-01AD21129ND
2016-02-01AD2103816.8 ppb
2016-02-01AD2104214.0 ppb
2016-02-01AD210436.30 ppb
2016-02-01AD2104020.0 ppb
2016-04-18AD33348ND
2016-04-18AD3331840.3 ppb
2016-04-18AD3331929.8 ppb
2016-04-18AD3332011.4 ppb
2016-04-18AD3331617.1 ppb
2016-07-05AD42962ND
2016-07-05AD4297416.0 ppb
2016-07-05AD4291667.1 ppb
2016-07-05AD4291760.7 ppb
2016-07-05AD4290935.1 ppb
2016-07-05AD4291569.8 ppb
2016-10-24AD543584.50 ppb
2016-10-24AD5427848.6 ppb
2016-10-24AD5427918.9 ppb
2016-10-24AD5428416.3 ppb
2016-10-24AD5428539.3 ppb
2017-02-13AD7036222.4 ppb
2017-02-13AD7036017.5 ppb
2017-02-13AD7035311.3 ppb
2017-02-13AD7035730.9 ppb
2017-04-06AD78768ND
2017-04-06AD7871134.6 ppb
2017-04-06AD7871220.0 ppb
2017-04-06AD7871316.7 ppb
2017-04-06AD7871024.5 ppb
2017-05-08AD83086ND
2017-05-08AD83088ND
2017-05-09AD833559.30 ppb
2017-05-09AD83359ND
2017-05-09AD83357ND
2017-07-05AD8833920.0 ppb
2017-07-05AD8828810.3 ppb
2017-07-05AD8828940.9 ppb
2017-07-05AD8828735.0 ppb
2017-07-05AD8829024.1 ppb
2017-07-05AD88333ND
2017-07-05AD88335ND
2017-07-05AD88337ND
2017-10-09AD9975614.6 ppb
2017-10-09AD9975732.9 ppb
2017-10-09AD9976015.5 ppb
2017-10-09AD9975549.1 ppb
2017-10-09AD9981821.0 ppb
2017-10-09AD99820ND