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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Manchester Water Department

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

 

290

Samples

0

Samples exceeding legal limit (MCL)

212

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201410.5 ppb4835ND - 32.4 ppb
20159.38 ppb4837ND - 36.4 ppb
20168.05 ppb4834ND - 38.1 ppb
201713.2 ppb4937ND - 50.3 ppb
20189.70 ppb4935ND - 38.0 ppb
201910.9 ppb4834ND - 56.0 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
2014-01-14AA63886-DBP12.10 ppb
2014-01-14AA63887-DBP111.7 ppb
2014-01-14AA63888-DBP14.70 ppb
2014-01-14AA63889-DBP113.4 ppb
2014-01-14AA63890-DBP114.2 ppb
2014-01-14AA63891-DBP19.40 ppb
2014-01-14AA63892-DBP118.9 ppb
2014-01-14AA63893-DBP112.5 ppb
2014-01-27AA64016-VOC12.30 ppb
2014-01-27AA64021-VOC1ND
2014-01-27AA64022-VOC1ND
2014-01-28AA64040-VOC11.10 ppb
2014-01-28AA64041-VOC1ND
2014-01-28AA64042-VOC1ND
2014-01-29AA64053-VOC1ND
2014-04-15AA64895-VOC1ND
2014-04-16AA64910-VOC1ND
2014-04-16AA64911-VOC1ND
2014-04-16AA64922-DBP122.6 ppb
2014-04-16AA64923-DBP113.0 ppb
2014-04-16AA64924-DBP18.10 ppb
2014-04-16AA64925-DBP121.6 ppb
2014-04-16AA64926-DBP116.1 ppb
2014-04-16AA64927-DBP114.5 ppb
2014-04-16AA64928-DBP112.6 ppb
2014-04-16AA64929-DBP12.70 ppb
2014-07-14AA65976-DBP126.6 ppb
2014-07-15AA65984-DBP119.0 ppb
2014-07-15AA65989-VOC1ND
2014-07-15AA65990-VOC11.10 ppb
2014-07-15AA65991-DBP117.5 ppb
2014-07-15AA65992-DBP121.5 ppb
2014-07-15AA65993-DBP124.3 ppb
2014-07-15AA65994-DBP131.2 ppb
2014-07-15AA66010-DBP122.4 ppb
2014-07-15AA66011-DBP112.0 ppb
2014-07-16AA66008-VOC1ND
2014-10-15AA67166-VOC1ND
2014-10-15AA67167-VOC1ND
2014-10-15AA67170-VOC1ND
2014-10-15AA67185-DBP132.4 ppb
2014-10-15AA67186-DBP19.70 ppb
2014-10-15AA67187-DBP12.00 ppb
2014-10-15AA67188-DBP118.5 ppb
2014-10-15AA67189-DBP122.1 ppb
2014-10-15AA67190-DBP118.4 ppb
2014-10-15AA67191-DBP111.9 ppb
2014-10-15AA67192-DBP112.6 ppb
2015-01-12AA68236-DBP12.60 ppb
2015-01-12AA68234-DBP17.60 ppb
2015-01-12AA68235-DBP118.6 ppb
2015-01-12AA68224-VOC12.70 ppb
2015-01-12AA68230-VOC1ND
2015-01-12AA68231-VOC1ND
2015-01-12AA68232-VOC1ND
2015-01-13AA68248-VOC11.000 ppb
2015-01-14AA68266-DBP17.90 ppb
2015-01-14AA68265-DBP17.90 ppb
2015-01-14AA68269-DBP111.1 ppb
2015-01-14AA68268-DBP19.30 ppb
2015-01-14AA68267-DBP114.9 ppb
2015-01-14AA68262-VOC1ND
2015-01-14AA68263-VOC11.20 ppb
2015-04-13AA69252-DBP114.6 ppb
2015-04-14AA69269-DBP18.30 ppb
2015-04-14AA69260-DBP18.50 ppb
2015-04-14AA69267-DBP18.10 ppb
2015-04-14AA69268-DBP117.4 ppb
2015-04-14AA69265-VOC1ND
2015-04-14AA69266-VOC1ND
2015-04-15AA69288-DBP112.1 ppb
2015-04-15AA69289-DBP115.5 ppb
2015-04-15AA69287-VOC10.500 ppb
2015-04-16AA69290-DBP13.00 ppb
2015-07-13AA70370-DBP118.3 ppb
2015-07-13AA70369-DBP130.5 ppb
2015-07-13AA70366-DBP123.3 ppb
2015-07-13AA70365-DBP15.90 ppb
2015-07-13AA70368-DBP136.4 ppb
2015-07-13AA70367-DBP119.2 ppb
2015-07-13AA70363-VOC1ND
2015-07-13AA70364-VOC1ND
2015-07-14AA70386-DBP121.0 ppb
2015-07-14AA70378-DBP110.2 ppb
2015-07-15AA70400-VOC15.20 ppb
2015-10-05AA71480-DBP19.90 ppb
2015-10-05AA71478-DBP13.50 ppb
2015-10-05AA71479-DBP135.7 ppb
2015-10-06AA71499-DBP113.9 ppb
2015-10-06AA71500-DBP11.10 ppb
2015-10-06AA71501-DBP114.9 ppb
2015-10-06AA71498-DBP111.8 ppb
2015-10-06AA71493-VOC1ND
2015-10-06AA71496-VOC1ND
2015-10-06AA71497-VOC1ND
2015-10-07AA71519-DBP116.5 ppb
2016-01-04AA72717-DBP116.7 ppb
2016-01-04AA72718-DBP14.60 ppb
2016-01-04AA72719-DBP12.90 ppb
2016-01-04AA72720-DBP12.40 ppb
2016-01-04AA72706-VOC12.10 ppb
2016-01-04AA72711-VOC1ND
2016-01-04AA72712-VOC1ND
2016-01-05AA72729-DBP10.600 ppb
2016-01-05AA72739-DBP17.50 ppb
2016-01-05AA72740-DBP16.40 ppb
2016-01-05AA72741-DBP15.00 ppb
2016-01-05AA72733-VOC11.20 ppb
2016-01-05AA72734-VOC1ND
2016-01-06AA72757-VOC1ND
2016-01-06AA72758-VOC1ND
2016-04-11AA73931-DBP113.0 ppb
2016-04-11AA73933-DBP132.6 ppb
2016-04-11AA73934-DBP14.20 ppb
2016-04-11AA73930-VOC1ND
2016-04-12AA73942-DBP14.20 ppb
2016-04-12AA73950-DBP119.5 ppb
2016-04-12AA73951-DBP111.1 ppb
2016-04-12AA73952-DBP117.1 ppb
2016-04-13AA73962-DBP17.50 ppb
2016-04-13AA73967-VOC1ND
2016-04-28AA74150-VOC1ND
2016-07-05AA75007-DBP12.90 ppb
2016-07-05AA75016-DBP118.4 ppb
2016-07-05AA75017-DBP119.8 ppb
2016-07-05AA75018-DBP138.1 ppb
2016-07-05AA75012-VOC1ND
2016-07-05AA75015-VOC1ND
2016-07-06AA75038-DBP19.40 ppb
2016-07-06AA75039-DBP121.1 ppb
2016-07-06AA75040-DBP123.3 ppb
2016-07-06AA75041-DBP118.8 ppb
2016-07-06AA75033-VOC1ND
2016-10-11AA76403-DBP10.800 ppb
2016-10-11AA76413-DBP110.2 ppb
2016-10-11AA76414-DBP18.50 ppb
2016-10-11AA76415-DBP13.40 ppb
2016-10-11AA76416-DBP119.9 ppb
2016-10-11AA76417-DBP16.90 ppb
2016-10-11AA76418-DBP115.0 ppb
2016-10-12AA76437-DBP111.2 ppb
2016-10-18AA76514-VOC1ND
2016-10-18AA76517-VOC1ND
2016-11-07AA76794-VOC1ND
2017-01-09AA77668-DBP19.90 ppb
2017-01-09AA77669-DBP111.0 ppb
2017-01-09AA77670-DBP16.00 ppb
2017-01-09AA77671-DBP18.70 ppb
2017-01-09AA77672-DBP14.50 ppb
2017-01-09AA77655-VOC13.10 ppb
2017-01-09AA77660-VOC1ND
2017-01-09AA77661-VOC1ND
2017-01-10AA77680-DBP10.900 ppb
2017-01-10AA77693-DBP17.10 ppb
2017-01-10AA77684-VOC10.500 ppb
2017-01-10AA77685-VOC1ND
2017-01-11AA77714-DBP11.40 ppb
2017-01-11AA77706-VOC1ND
2017-01-11AA77707-VOC1ND
2017-04-03AA78766-DBP138.1 ppb
2017-04-03AA78767-DBP121.0 ppb
2017-04-03AA78768-DBP119.5 ppb
2017-04-03AA78788-DBP123.4 ppb
2017-04-04AA78789-DBP19.40 ppb
2017-04-05AA78803-DBP128.0 ppb
2017-04-05AA78807-DBP127.0 ppb
2017-04-05AA78808-DBP126.2 ppb
2017-04-05AA78802-VOC11.40 ppb
2017-04-21AA79012-VOC1ND
2017-04-28AA79094-VOC1ND
2017-04-28AA79095-VOC1ND
2017-07-10AA80081-DBP143.0 ppb
2017-07-10AA80082-DBP124.9 ppb
2017-07-10AA80083-DBP116.8 ppb
2017-07-10AA80084-DBP115.2 ppb
2017-07-10AA80085-DBP117.0 ppb
2017-07-10AA80086-DBP19.20 ppb
2017-07-10AA80087-DBP116.0 ppb
2017-07-11AA80108-DBP127.0 ppb
2017-07-11AA80100-VOC1ND
2017-07-11AA80102-VOC1ND
2017-07-12AA80122-VOC10.500 ppb
2017-10-10AA81238-DBP120.4 ppb
2017-10-10AA81246-DBP150.3 ppb
2017-10-10AA81247-DBP121.6 ppb
2017-10-10AA81248-DBP142.8 ppb
2017-10-10AA81249-DBP131.5 ppb
2017-10-10AA81250-DBP130.4 ppb
2017-10-10AA81251-DBP126.1 ppb
2017-10-10AA81252-DBP16.60 ppb
2017-10-24AA81429-VOC1ND
2017-10-25AA81444-VOC1ND
2017-10-25AA81445-VOC10.900 ppb
2018-01-08AA82357-DBP127.0 ppb
2018-01-08AA82358-DBP116.0 ppb
2018-01-08AA82359-DBP15.80 ppb
2018-01-08AA82323-VOC12.30 ppb
2018-01-08AA82328-VOC1ND
2018-01-08AA82329-VOC1ND
2018-01-09AA82360-DBP113.0 ppb
2018-01-09AA82343-DBP16.20 ppb
2018-01-09AA82355-DBP111.0 ppb
2018-01-09AA82356-DBP114.0 ppb
2018-01-09AA82347-VOC10.600 ppb
2018-01-09AA82348-VOC1ND
2018-01-09AA82350-VOC1ND
2018-01-10AA82378-DBP123.0 ppb
2018-01-10AA82372-VOC1ND
2018-01-10AA82373-VOC1ND
2018-04-10AA83453-VOC1ND
2018-04-10AA83456-VOC1ND
2018-04-11AA83470-VOC10.500 ppb
2018-04-16AA83526-DBP120.0 ppb
2018-04-16AA83527-DBP12.20 ppb
2018-04-17AA83543-DBP111.0 ppb
2018-04-17AA83544-DBP14.00 ppb
2018-04-17AA83545-DBP113.0 ppb
2018-04-17AA83546-DBP18.10 ppb
2018-04-17AA83547-DBP18.40 ppb
2018-04-17AA83548-DBP15.90 ppb
2018-07-16AA84694-DBP14.80 ppb
2018-07-16AA84706-DBP125.0 ppb
2018-07-17AA84723-DBP117.0 ppb
2018-07-17AA84724-DBP113.0 ppb
2018-07-17AA84725-DBP116.0 ppb
2018-07-17AA84726-DBP18.80 ppb
2018-07-17AA84727-DBP138.0 ppb
2018-07-17AA84729-DBP120.0 ppb
2018-07-17AA84728-VOC1ND
2018-07-18AA84742-VOC1ND
2018-07-18AA84743-VOC1ND
2018-10-15AA85872-DBP112.0 ppb
2018-10-15AA85873-DBP116.0 ppb
2018-10-15AA85874-DBP126.0 ppb
2018-10-15AA85924-DBP116.0 ppb
2018-10-16AA85880-DBP17.80 ppb
2018-10-16AA85882-DBP16.10 ppb
2018-10-16AA85893-DBP129.0 ppb
2018-10-16AA85887-VOC1ND
2018-10-17AA85906-VOC1ND
2018-10-17AA85907-VOC1ND
2018-10-18AA85923-DBP128.0 ppb
2019-01-14AA86944-DBP111.0 ppb
2019-01-14AA86945-DBP12.50 ppb
2019-01-15AA86953-DBP13.70 ppb
2019-01-15AA86960-DBP13.90 ppb
2019-01-15AA86961-DBP19.40 ppb
2019-01-15AA86962-DBP15.90 ppb
2019-01-15AA86956-VOC1ND
2019-01-15AA86957-VOC1ND
2019-01-16AA86968-DBP11.40 ppb
2019-01-16AA86978-DBP18.70 ppb
2019-01-16AA86968-VOC10.510 ppb
2019-01-16AA86974-VOC1ND
2019-01-16AA86975-VOC1ND
2019-01-17AA86989-VOC1ND
2019-01-17AA86990-VOC1ND
2019-04-15AA88012-DBP14.01 ppb
2019-04-15AA88021-DBP18.01 ppb
2019-04-15AA88022-DBP112.7 ppb
2019-04-15AA88023-DBP111.8 ppb
2019-04-15AA88024-DBP111.9 ppb
2019-04-15AA88025-DBP121.0 ppb
2019-04-17AA88059-DBP113.1 ppb
2019-04-17AA88060-DBP17.68 ppb
2019-04-23AA88123-VOC1ND
2019-04-24AA88139-VOC1ND
2019-04-24AA88140-VOC1ND
2019-07-08AA89073-VOC1ND
2019-07-08AA89074-VOC1ND
2019-07-10AA89110-VOC1ND
2019-07-15AA89173-DBP114.2 ppb
2019-07-15AA89174-DBP112.8 ppb
2019-07-15AA89175-DBP119.7 ppb
2019-07-15AA89176-DBP132.9 ppb
2019-07-15AA89177-DBP119.6 ppb
2019-07-16AA89183-DBP19.46 ppb
2019-07-16AA89193-DBP12.14 ppb
2019-07-16AA89194-DBP124.7 ppb
2019-10-08AA90268-VOC1ND
2019-10-09AA90285-VOC1ND
2019-10-09AA90287-VOC10.670 ppb
2019-10-15AA90342-DBP116.0 ppb
2019-10-15AA90344-DBP133.9 ppb
2019-10-15AA90353-DBP144.8 ppb
2019-10-15AA90354-DBP156.0 ppb
2019-10-15AA90355-DBP118.0 ppb
2019-10-15AA90356-DBP122.1 ppb
2019-10-15AA90357-DBP121.5 ppb
2019-10-15AA90358-DBP136.5 ppb