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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

City of Burlington

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

 

209

Samples

0

Samples exceeding legal limit (MCL)

209

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201434.3 ppb434319.0 ppb - 53.0 ppb
201541.1 ppb333316.8 ppb - 65.0 ppb
201633.3 ppb37374.16 ppb - 62.8 ppb
201742.1 ppb323225.3 ppb - 61.7 ppb
201835.1 ppb323220.0 ppb - 52.7 ppb
201927.0 ppb323213.8 ppb - 42.0 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
2014-01-1315859-1419.0 ppb
2014-01-1337729_14-0150232.0 ppb
2014-02-1937729_14-0508220.0 ppb
2014-02-1937729_14-0508429.0 ppb
2014-02-1937729_14-0508525.0 ppb
2014-02-1937729_14-0508639.0 ppb
2014-02-1937729_14-0508732.0 ppb
2014-02-1937729_14-0508935.0 ppb
2014-02-1937729_14-0509036.0 ppb
2014-02-1937729_14-0509119.0 ppb
2014-04-0917228-1425.0 ppb
2014-04-0917229-1424.0 ppb
2014-04-1017230-1421.0 ppb
2014-05-21173145-1450.0 ppb
2014-05-2137729_14-1460431.0 ppb
2014-05-2137729_14-1460640.0 ppb
2014-05-2137729_14-1460744.0 ppb
2014-05-2137729_14-1460839.0 ppb
2014-05-2137729_14-1460941.0 ppb
2014-05-2137729_14-1461138.0 ppb
2014-05-2137729_14-1461238.0 ppb
2014-05-2137729_14-1461343.0 ppb
2014-06-02173144-1452.0 ppb
2014-08-2037729_14-2545336.0 ppb
2014-08-2037729_14-2545440.0 ppb
2014-08-2037729_14-2545535.0 ppb
2014-08-2037729_14-2545637.0 ppb
2014-08-2037729_14-2545735.0 ppb
2014-08-2037729_14-2545937.0 ppb
2014-08-2037729_14-2546042.0 ppb
2014-08-2037729_14-2546145.0 ppb
2014-08-20173773-1450.0 ppb
2014-08-20173774-1453.0 ppb
2014-11-1937729_14-3548841.0 ppb
2014-11-1937729_14-3548936.0 ppb
2014-11-1937729_14-3549022.0 ppb
2014-11-1937729_14-3549133.0 ppb
2014-11-1937729_14-3549220.0 ppb
2014-11-1937729_14-3549332.0 ppb
2014-11-1937729_14-3549424.0 ppb
2014-11-1937729_14-3549528.0 ppb
2014-11-19174412-1422.0 ppb
2014-11-19174413-1434.0 ppb
2015-02-1831.1 ppb
2015-02-1826.0 ppb
2015-02-1822.3 ppb
2015-02-1824.8 ppb
2015-02-1825.4 ppb
2015-02-1831.1 ppb
2015-02-1826.8 ppb
2015-02-1816.8 ppb
2015-05-1956.0 ppb
2015-05-2133.0 ppb
2015-05-2139.0 ppb
2015-05-2136.0 ppb
2015-05-2160.0 ppb
2015-05-2156.0 ppb
2015-05-2165.0 ppb
2015-05-2144.0 ppb
2015-08-1940.6 ppb
2015-08-1948.0 ppb
2015-08-1948.0 ppb
2015-08-1946.0 ppb
2015-08-1945.0 ppb
2015-08-1944.0 ppb
2015-08-1944.0 ppb
2015-08-1952.0 ppb
2015-08-1948.0 ppb
2015-11-1840.0 ppb
2015-11-1841.0 ppb
2015-11-1850.0 ppb
2015-11-1844.0 ppb
2015-11-1839.0 ppb
2015-11-1843.0 ppb
2015-11-1844.0 ppb
2015-11-1846.0 ppb
2016-02-1737729_16-0523857.0 ppb
2016-02-1737729_16-0523937.0 ppb
2016-02-1737729_16-0524034.0 ppb
2016-02-1737729_16-0524138.0 ppb
2016-02-1737729_16-0524231.0 ppb
2016-02-1737729_16-0524335.0 ppb
2016-02-1737729_16-0524433.0 ppb
2016-02-1737729_16-0524523.0 ppb
2016-05-1837729_16-1584753.7 ppb
2016-05-1837729_16-1585135.7 ppb
2016-05-1837729_16-1585231.3 ppb
2016-05-1837729_16-1585349.1 ppb
2016-05-1837729_16-1585430.8 ppb
2016-05-1837729_16-1585532.8 ppb
2016-05-1837729_16-1585633.8 ppb
2016-05-1837729_16-1585746.0 ppb
2016-08-1837729_16-2877027.3 ppb
2016-08-1837729_16-2877132.5 ppb
2016-08-1837729_16-2877241.2 ppb
2016-08-1837729_16-2877333.4 ppb
2016-08-1837729_16-2877432.6 ppb
2016-08-1837729_16-2877529.5 ppb
2016-08-1837729_16-2877632.3 ppb
2016-08-1837729_16-2877731.8 ppb
2016-08-1837729_16-2877834.9 ppb
2016-08-181140-1648.0 ppb
2016-08-2237729_16-2876962.8 ppb
2016-11-1737729_16-4061439.2 ppb
2016-11-1737729_16-4061519.9 ppb
2016-11-1737729_16-4061631.9 ppb
2016-11-1737729_16-406174.16 ppb
2016-11-1737729_16-4061821.5 ppb
2016-11-1737729_16-4061920.0 ppb
2016-11-1737729_16-4062023.2 ppb
2016-11-1737729_16-4062127.1 ppb
2016-11-1737729_16-4062221.4 ppb
2016-11-1737729_16-4062318.1 ppb
2017-02-1537729_17-0555954.4 ppb
2017-02-1537729_17-0556035.9 ppb
2017-02-1537729_17-0556133.9 ppb
2017-02-1537729_17-0556245.3 ppb
2017-02-1537729_17-0556334.2 ppb
2017-02-1537729_17-0556436.8 ppb
2017-02-1537729_17-0556536.1 ppb
2017-02-1537729_17-0556632.2 ppb
2017-05-1737729_17-1660360.9 ppb
2017-05-1737729_17-1660442.4 ppb
2017-05-1737729_17-1660540.5 ppb
2017-05-1737729_17-1660650.8 ppb
2017-05-1737729_17-1660743.6 ppb
2017-05-1737729_17-1660847.2 ppb
2017-05-1737729_17-1660946.7 ppb
2017-05-1737729_17-1661042.8 ppb
2017-08-1637729_17-2951339.1 ppb
2017-08-1637729_17-2951456.5 ppb
2017-08-1637729_17-2951530.1 ppb
2017-08-1637729_17-2951653.0 ppb
2017-08-1637729_17-2951750.3 ppb
2017-08-1637729_17-2951857.9 ppb
2017-08-1637729_17-2951961.7 ppb
2017-08-1637729_17-2952039.0 ppb
2017-11-1537729_17-4344131.9 ppb
2017-11-1537729_17-4344239.6 ppb
2017-11-1537729_17-4344337.7 ppb
2017-11-1537729_17-4344429.2 ppb
2017-11-1537729_17-4344534.5 ppb
2017-11-1537729_17-4344641.2 ppb
2017-11-1537729_17-4344738.2 ppb
2017-11-1537729_17-4344825.3 ppb
2018-02-2037729_18-07245 40.0 ppb
2018-02-2137729_18-07243 36.6 ppb
2018-02-2137729_18-07246 36.8 ppb
2018-02-2137729_18-07247 25.9 ppb
2018-02-2137729_18-07248 42.2 ppb
2018-02-2137729_18-07249 52.7 ppb
2018-02-2137729_18-07250 43.7 ppb
2018-02-2137729_18-07251 20.0 ppb
2018-05-3037729_18-21553 46.6 ppb
2018-05-3037729_18-21554 42.8 ppb
2018-05-3037729_18-21555 41.5 ppb
2018-05-3037729_18-21556 30.9 ppb
2018-05-3037729_18-21557 24.3 ppb
2018-05-3037729_18-21558 31.1 ppb
2018-05-3037729_18-21559 29.6 ppb
2018-05-3037729_18-21560 25.5 ppb
2018-08-1537729_18-34328 38.0 ppb
2018-08-1537729_18-34329 38.1 ppb
2018-08-1537729_18-34330 39.9 ppb
2018-08-1537729_18-34331 37.7 ppb
2018-08-1537729_18-34332 33.2 ppb
2018-08-1537729_18-34333 38.3 ppb
2018-08-1537729_18-34334 38.1 ppb
2018-08-1537729_18-34335 34.6 ppb
2018-11-1437729_18-48169 41.0 ppb
2018-11-1437729_18-48170 39.0 ppb
2018-11-1437729_18-48171 32.0 ppb
2018-11-1437729_18-48172 27.0 ppb
2018-11-1437729_18-48173 28.0 ppb
2018-11-1437729_18-48174 31.0 ppb
2018-11-1437729_18-48175 33.0 ppb
2018-11-1437729_18-48176 23.0 ppb
2019-02-1937729_19-07385 18.1 ppb
2019-02-1937729_19-07386 21.9 ppb
2019-02-1937729_19-07387 22.6 ppb
2019-02-1937729_19-07388 23.1 ppb
2019-02-1937729_19-07389 18.6 ppb
2019-02-1937729_19-07390 30.5 ppb
2019-02-1937729_19-07391 28.6 ppb
2019-02-1937729_19-07392 20.0 ppb
2019-05-1537729_19-20130 37.7 ppb
2019-05-1537729_19-20131 40.2 ppb
2019-05-1537729_19-20132 32.5 ppb
2019-05-1537729_19-20133 32.9 ppb
2019-05-1537729_19-20134 30.3 ppb
2019-05-1537729_19-20135 42.0 ppb
2019-05-1537729_19-20136 35.3 ppb
2019-05-1537729_19-20137 29.0 ppb
2019-08-2137729_19-36220 32.5 ppb
2019-08-2137729_19-36221 29.5 ppb
2019-08-2137729_19-36222 29.4 ppb
2019-08-2137729_19-36223 30.4 ppb
2019-08-2137729_19-36224 21.9 ppb
2019-08-2137729_19-36225 25.7 ppb
2019-08-2137729_19-36226 25.2 ppb
2019-08-2137729_19-36227 28.4 ppb
2019-11-2037729_19-50098 29.5 ppb
2019-11-2037729_19-50102 23.7 ppb
2019-11-2037729_19-50103 22.0 ppb
2019-11-2037729_19-50104 18.8 ppb
2019-11-2037729_19-50105 22.1 ppb
2019-11-2037729_19-50106 25.1 ppb
2019-11-2037729_19-50107 23.6 ppb
2019-11-2037729_19-50108 13.8 ppb