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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Danbury 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

 

207

Samples

0

Samples exceeding legal limit (MCL)

207

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201434.7 ppb37374.90 ppb - 78.0 ppb
201529.7 ppb34344.80 ppb - 59.0 ppb
201629.9 ppb34345.30 ppb - 60.8 ppb
201732.3 ppb343415.0 ppb - 58.0 ppb
201829.5 ppb34347.90 ppb - 66.5 ppb
201921.8 ppb34347.30 ppb - 40.2 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
2014-02-18E402994-5VOC6.40 ppb
2014-02-18E402994-6VOC4.90 ppb
2014-03-11E403C94-2TTHM25.0 ppb
2014-03-11E403C94-4TTHM26.0 ppb
2014-03-11E403C94-7TTHM24.0 ppb
2014-03-12E403C94-1TTHM33.0 ppb
2014-03-13E403C94-6TTHM14.0 ppb
2014-03-14E403C94-8TTHM19.0 ppb
2014-03-17E403C94-3TTHM19.0 ppb
2014-03-18E403C94-5TTHM12.0 ppb
2014-06-10E406G56-4TTHM48.0 ppb
2014-06-10E406G56-6TTHM39.0 ppb
2014-06-11E406G56-1TTHM55.0 ppb
2014-06-12E406G56-2TTHM39.0 ppb
2014-06-12E406G56-7TTHM48.0 ppb
2014-06-12E406G56-8TTHM30.0 ppb
2014-06-13E406G56-5TTHM38.0 ppb
2014-06-16E406G56-3TTHM24.0 ppb
2014-09-10E409F66-1TTHM56.0 ppb
2014-09-11E409F66-4TTHM69.0 ppb
2014-09-11E409F66-6TTHM45.0 ppb
2014-09-12E409F66-2TTHM44.0 ppb
2014-09-12E409F66-8TTHM43.0 ppb
2014-09-15E409F66-3TTHM42.0 ppb
2014-09-23E409M19-1TTHM78.0 ppb
2014-09-23E409M19-2TTHM45.0 ppb
2014-09-23E409M19-3TTHM68.0 ppb
2014-09-30E409T37-2TTHM39.0 ppb
2014-09-30E410021-1TTHM57.0 ppb
2014-12-12E412D88-1TTHM38.0 ppb
2014-12-12E412D88-7TTHM19.0 ppb
2014-12-12E412D88-8TTHM21.0 ppb
2014-12-15E412D88-2TTHM14.0 ppb
2014-12-15E412D88-3TTHM26.0 ppb
2014-12-15E412D88-4TTHM38.0 ppb
2014-12-15E412D88-6TTHM20.0 ppb
2014-12-16E412D88-5TTHM19.0 ppb
2015-03-12E503B60-2TTHM25.0 ppb
2015-03-12E503B60-5TTHM22.0 ppb
2015-03-13E503B60-6TTHM18.0 ppb
2015-03-13E503B60-4TTHM27.0 ppb
2015-03-13E503B60-1TTHM34.0 ppb
2015-03-16E503B60-3TTHM22.0 ppb
2015-03-25E503J77-1TTHM20.0 ppb
2015-03-26E503J77-2TTHM20.0 ppb
2015-04-21E504H71-2VOC5.20 ppb
2015-04-21E504H71-1VOC4.80 ppb
2015-06-11E506H99-5TTHM24.0 ppb
2015-06-12E506H99-8TTHM18.0 ppb
2015-06-12E506H99-7TTHM38.0 ppb
2015-06-15E506H99-4TTHM29.0 ppb
2015-06-15E506H99-2TTHM21.0 ppb
2015-06-15E506H99-3TTHM20.0 ppb
2015-06-15E506H99-1TTHM40.0 ppb
2015-06-16E506H99-6TTHM29.0 ppb
2015-09-18E509O88-8TTHM34.0 ppb
2015-09-18E509O88-6TTHM48.0 ppb
2015-09-21E509O88-2TTHM46.0 ppb
2015-09-21E509O88-3TTHM32.0 ppb
2015-09-21E509O88-1TTHM56.0 ppb
2015-09-22E509O88-5TTHM57.0 ppb
2015-09-29E509W38-1TTHM48.0 ppb
2015-09-29E509W38-2TTHM59.0 ppb
2015-12-17E512K74-5-19TTHM26.0 ppb
2015-12-17E512K74-4-18TTHM30.0 ppb
2015-12-17E512K74-1-16TTHM41.0 ppb
2015-12-17E512K74-2-17TTHM14.0 ppb
2015-12-17E512K74-7-15TTHM38.0 ppb
2015-12-18E512K74-6-20TTHM19.0 ppb
2015-12-18E512K74-8-04TTHM22.0 ppb
2015-12-21E512K74-3-03TTHM23.0 ppb
2016-03-09E603E03-1-16TTHM39.0 ppb
2016-03-09E603E03-4-18TTHM30.0 ppb
2016-03-10E603E03-5-19TTHM19.0 ppb
2016-03-10E603E03-6-20TTHM22.0 ppb
2016-03-10E603E03-7-15TTHM26.0 ppb
2016-03-10E603E03-2-17TTHM12.0 ppb
2016-03-11E603E03-8-04TTHM20.0 ppb
2016-03-14E603E03-3-03TTHM24.0 ppb
2016-04-19E604J01-5VOC5.30 ppb
2016-04-19E604J01-6VOC6.10 ppb
2016-06-16E606O13-1-16TTHM46.0 ppb
2016-06-16E606O13-2-17TTHM26.0 ppb
2016-06-16E606O13-4-18TTHM35.0 ppb
2016-06-16E606O13-5-19TTHM25.0 ppb
2016-06-16E606O13-6-20TTHM35.0 ppb
2016-06-16E606O13-8-04TTHM28.0 ppb
2016-06-20E606O13-7-15TTHM38.0 ppb
2016-06-20E606O13-3-03TTHM23.0 ppb
2016-09-08188687CH41.3 ppb
2016-09-09188691CH32.8 ppb
2016-09-13188689CH60.8 ppb
2016-09-13188677CH35.8 ppb
2016-09-13188679CH28.7 ppb
2016-09-13188681CH30.2 ppb
2016-09-13188683CH44.1 ppb
2016-09-14188685CH47.1 ppb
2016-12-12192764CH27.9 ppb
2016-12-13192766CH46.8 ppb
2016-12-13192768CH31.6 ppb
2016-12-13192754CH29.6 ppb
2016-12-13192756CH22.7 ppb
2016-12-13192760CH27.7 ppb
2016-12-13192762CH19.4 ppb
2016-12-14192758CH29.3 ppb
2017-02-15194887GE15.0 ppb
2017-02-15194886GE30.0 ppb
2017-03-09196065GE25.2 ppb
2017-03-09196059GE33.9 ppb
2017-03-09196061GE31.1 ppb
2017-03-13196063GE35.3 ppb
2017-03-14196069GE29.2 ppb
2017-03-15196071GE28.4 ppb
2017-03-15196073GE33.7 ppb
2017-03-15196067GE22.8 ppb
2017-06-13200345GE33.8 ppb
2017-06-13200351GE38.9 ppb
2017-06-14200349GE32.5 ppb
2017-06-14200341GE26.2 ppb
2017-06-14200339GE31.7 ppb
2017-06-15200343GE24.6 ppb
2017-06-15200353GE36.4 ppb
2017-06-15200347GE28.3 ppb
2017-09-12204472GE41.1 ppb
2017-09-12204474GE32.1 ppb
2017-09-12204478GE38.9 ppb
2017-09-12204484GE58.0 ppb
2017-09-12204486GE41.4 ppb
2017-09-13204480GE39.8 ppb
2017-09-13204482GE36.8 ppb
2017-09-13204476GE33.2 ppb
2017-12-11208503GE37.2 ppb
2017-12-11208505GE26.9 ppb
2017-12-12208507GE18.7 ppb
2017-12-12208509GE34.4 ppb
2017-12-12208511GE34.2 ppb
2017-12-12208513GE33.1 ppb
2017-12-12208501GE24.6 ppb
2017-12-12208499GE30.9 ppb
2018-02-21210745GE9.96 ppb
2018-02-21210744GE20.9 ppb
2018-03-14211584GE28.8 ppb
2018-03-14211586GE23.3 ppb
2018-03-14211588GE28.6 ppb
2018-03-14211590GE26.6 ppb
2018-03-14211598GE27.2 ppb
2018-03-15211592GE22.5 ppb
2018-03-15211594GE26.2 ppb
2018-03-15211596GE26.7 ppb
2018-06-19215736GE31.4 ppb
2018-06-19215738GE25.0 ppb
2018-06-19215742GE31.0 ppb
2018-06-19215744GE31.6 ppb
2018-06-19215750GE29.8 ppb
2018-06-20215746GE34.8 ppb
2018-06-20215748GE37.7 ppb
2018-06-20215740GE28.3 ppb
2018-09-14DBP 20050548422.9 ppb
2018-09-14DBP 20050548629.6 ppb
2018-09-14DBP 20050549151.0 ppb
2018-09-14DBP 20050549344.3 ppb
2018-09-14DBP 20050549566.5 ppb
2018-09-14DBP 20050549732.0 ppb
2018-09-14DBP 20050549951.3 ppb
2018-09-17DBP 20050565857.0 ppb
2018-12-14DBP 20051609326.2 ppb
2018-12-14DBP 2005160947.90 ppb
2018-12-14DBP 20051609512.2 ppb
2018-12-14DBP 20051609621.6 ppb
2018-12-14DBP 20051609728.2 ppb
2018-12-14DBP 20051609810.2 ppb
2018-12-14DBP 20051609933.2 ppb
2018-12-14DBP 20051610018.1 ppb
2019-03-14DBP 20052476025.2 ppb
2019-03-14DBP 2005247618.90 ppb
2019-03-14DBP 20052476213.6 ppb
2019-03-14DBP 20052476328.6 ppb
2019-03-14DBP 20052476411.2 ppb
2019-03-14DBP 20052476516.2 ppb
2019-03-14DBP 20052476620.0 ppb
2019-03-14DBP 20052476711.1 ppb
2019-06-20DBP 20053726533.4 ppb
2019-06-20DBP 20053726613.3 ppb
2019-06-20DBP 20053726712.6 ppb
2019-06-20DBP 20053726837.2 ppb
2019-06-20DBP 20053726930.9 ppb
2019-06-20DBP 20053727029.8 ppb
2019-06-20DBP 20053727140.2 ppb
2019-06-20DBP 20053727220.2 ppb
2019-08-15VOC1 20054512120.8 ppb
2019-08-15VOC1 20054512220.1 ppb
2019-09-19DBP 20054961231.7 ppb
2019-09-19DBP 20054961313.7 ppb
2019-09-19DBP 20054961415.9 ppb
2019-09-19DBP 20054961535.0 ppb
2019-09-19DBP 20054961634.0 ppb
2019-09-19DBP 20054961731.9 ppb
2019-09-19DBP 20054961838.6 ppb
2019-09-19DBP 20054961924.0 ppb
2019-12-19DBP 20056092622.1 ppb
2019-12-19DBP 2005609277.30 ppb
2019-12-19DBP 2005609297.40 ppb
2019-12-19DBP 20056093015.3 ppb
2019-12-19DBP 20056093121.1 ppb
2019-12-19DBP 20056093218.6 ppb
2019-12-19DBP 20056093411.4 ppb
2019-12-19DBP 20056093519.2 ppb