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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Haysville

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

 

97

Samples

0

Samples exceeding legal limit (MCL)

63

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.33 ppb1610ND - 12.0 ppb
20151.67 ppb1611ND - 6.70 ppb
20162.60 ppb1612ND - 11.0 ppb
20174.46 ppb1712ND - 18.0 ppb
20188.24 ppb1610ND - 36.0 ppb
20192.58 ppb168ND - 13.0 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
2014-03-1176648ND
2014-03-11766472.96 ppb
2014-03-1176646ND
2014-03-11766451.60 ppb
2014-06-101268872.40 ppb
2014-06-101268865.10 ppb
2014-06-10126852ND
2014-06-101268519.40 ppb
2014-09-09191462ND
2014-09-0919146011.0 ppb
2014-09-0919146812.0 ppb
2014-09-091914703.10 ppb
2014-12-08243939ND
2014-12-082439381.10 ppb
2014-12-08243937ND
2014-12-082439364.60 ppb
2015-03-162967540.780 ppb
2015-03-162967533.10 ppb
2015-03-16296752ND
2015-03-162967512.00 ppb
2015-06-15349017ND
2015-06-153490181.20 ppb
2015-06-153490206.70 ppb
2015-06-153490191.50 ppb
2015-09-14405796ND
2015-09-144057956.20 ppb
2015-09-144057942.30 ppb
2015-09-144057931.40 ppb
2015-12-14461218ND
2015-12-144612170.610 ppb
2015-12-14461216ND
2015-12-144612150.860 ppb
2016-03-075067932.40 ppb
2016-03-075067921.000 ppb
2016-03-075067940.700 ppb
2016-03-07506795ND
2016-06-065592941.90 ppb
2016-06-065592930.550 ppb
2016-06-065592924.90 ppb
2016-06-06559291ND
2016-09-126215043.50 ppb
2016-09-1262150311.0 ppb
2016-09-126215023.40 ppb
2016-09-12621501ND
2016-12-066685415.40 ppb
2016-12-066685401.30 ppb
2016-12-066685395.50 ppb
2016-12-06668538ND
2017-03-137232834.30 ppb
2017-03-137232820.810 ppb
2017-03-137232811.70 ppb
2017-03-13723280ND
2017-06-127766897.60 ppb
2017-06-127766881.20 ppb
2017-06-1277668712.0 ppb
2017-06-12776686ND
2017-09-188423441.60 ppb
2017-09-18842345ND
2017-09-1884234618.0 ppb
2017-09-188423478.10 ppb
2017-10-23865406_PACEND
2017-12-118916871.000 ppb
2017-12-1189168618.0 ppb
2017-12-11891685ND
2017-12-118916841.50 ppb
2018-03-129361747.10 ppb
2018-03-12936173ND
2018-03-129361720.660 ppb
2018-03-129361714.50 ppb
2018-06-11986704ND
2018-06-1198670533.0 ppb
2018-06-119867070.500 ppb
2018-06-119867066.50 ppb
2018-09-171044630ND
2018-09-17104462925.0 ppb
2018-09-17104462836.0 ppb
2018-09-171044627ND
2018-12-101089162ND
2018-12-10108916112.0 ppb
2018-12-101089160ND
2018-12-1010891596.50 ppb
2019-03-1811392974.10 ppb
2019-03-181139296ND
2019-03-181139298ND
2019-03-1811392995.10 ppb
2019-06-101184526ND
2019-06-101184525ND
2019-06-1011845241.10 ppb
2019-06-1011845235.30 ppb
2019-09-17124301513.0 ppb
2019-09-171243014ND
2019-09-1712430131.80 ppb
2019-09-171243012ND
2019-12-0212815750.940 ppb
2019-12-021281579ND
2019-12-021281578ND
2019-12-02128157610.00 ppb