Know Your Environment. Protect Your Health.

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.

 

193

Samples

0

Samples exceeding legal limit (MCL)

192

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201829.5 ppb34347.90 ppb - 66.5 ppb
201921.8 ppb34347.30 ppb - 40.2 ppb
202023.7 ppb35350.500 ppb - 53.2 ppb
202119.7 ppb26261.78 ppb - 42.2 ppb
202224.6 ppb2625ND - 42.7 ppb
202326.0 ppb38382.52 ppb - 53.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
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
2020-02-20VOC1 2005668934.20 ppb
2020-02-20VOC1 2005668923.80 ppb
2020-02-21VOC1 2005669820.500 ppb
2020-03-19DBP 20056997622.5 ppb
2020-03-19DBP 20056997710.8 ppb
2020-03-19DBP 20056997814.8 ppb
2020-03-19DBP 20056997934.4 ppb
2020-03-19DBP 20056998022.8 ppb
2020-03-19DBP 20056998111.4 ppb
2020-03-19DBP 20056998227.5 ppb
2020-03-19DBP 20056998315.1 ppb
2020-06-18DBP 20057979433.8 ppb
2020-06-18DBP 20057979515.3 ppb
2020-06-18DBP 20057979612.6 ppb
2020-06-18DBP 20057979736.3 ppb
2020-06-18DBP 20057979832.7 ppb
2020-06-18DBP 20057979914.9 ppb
2020-06-18DBP 20057980035.2 ppb
2020-06-18DBP 20057980118.8 ppb
2020-09-17DBP 20059066141.8 ppb
2020-09-17DBP 20059066223.7 ppb
2020-09-17DBP 20059066340.4 ppb
2020-09-17DBP 20059066453.2 ppb
2020-09-17DBP 20059066519.3 ppb
2020-09-17DBP 20059066616.2 ppb
2020-09-17DBP 20059066743.2 ppb
2020-09-17DBP 20059066837.6 ppb
2020-12-18DBP 20060159832.0 ppb
2020-12-18DBP 2006015999.40 ppb
2020-12-18DBP 2006016009.70 ppb
2020-12-18DBP 20060160117.2 ppb
2020-12-18DBP 20060160225.3 ppb
2020-12-18DBP 20060160332.3 ppb
2020-12-18DBP 20060160431.6 ppb
2020-12-18DBP 20060160528.0 ppb
2021-01-21VOC1 2006045714.80 ppb
2021-01-21VOC1 2006045705.70 ppb
2021-03-18DBP 20061031622.4 ppb
2021-03-18DBP 2006103177.60 ppb
2021-03-18DBP 2006103186.50 ppb
2021-03-18DBP 20061031916.2 ppb
2021-03-18DBP 20061032042.2 ppb
2021-03-18DBP 20061032117.1 ppb
2021-03-18DBP 20061032226.5 ppb
2021-03-18DBP 2006103236.00 ppb
2021-06-17DBP 20062134135.4 ppb
2021-06-17DBP 20062134217.5 ppb
2021-06-17DBP 20062134335.7 ppb
2021-06-17DBP 20062134438.6 ppb
2021-06-17DBP 20062134512.5 ppb
2021-06-17DBP 20062134613.0 ppb
2021-06-17DBP 20062134729.6 ppb
2021-06-17DBP 20062134831.5 ppb
2021-12-13277826X1.78 ppb
2021-12-1427782231.0 ppb
2021-12-14277824X12.4 ppb
2021-12-14277828X21.0 ppb
2021-12-14277830X19.0 ppb
2021-12-14277832X26.4 ppb
2021-12-14277834X3.32 ppb
2021-12-14277836X29.2 ppb
2022-01-202793264.33 ppb
2022-01-20279325ND
2022-06-1428830242.7 ppb
2022-06-1428830425.2 ppb
2022-06-1428829641.4 ppb
2022-06-1428829841.1 ppb
2022-06-1528830038.8 ppb
2022-06-1528829036.3 ppb
2022-06-1528829219.6 ppb
2022-06-1528829420.7 ppb
2022-09-1429628922.0 ppb
2022-09-1529629131.0 ppb
2022-09-1529629334.7 ppb
2022-09-1529629535.2 ppb
2022-09-1529629732.5 ppb
2022-09-1529629933.1 ppb
2022-09-1529630121.1 ppb
2022-09-1529630738.0 ppb
2022-12-1330302717.0 ppb
2022-12-1330303020.1 ppb
2022-12-1330303417.4 ppb
2022-12-1330303621.0 ppb
2022-12-133030386.72 ppb
2022-12-1430303219.0 ppb
2022-12-1530302513.8 ppb
2022-12-153030237.75 ppb
2023-02-093062323.33 ppb
2023-02-093062312.52 ppb
2023-03-0630781317.6 ppb
2023-03-0730781122.1 ppb
2023-03-073078128.60 ppb
2023-03-0730781718.4 ppb
2023-03-0730781810.00 ppb
2023-03-0730781411.3 ppb
2023-03-0730781611.8 ppb
2023-03-0830781513.7 ppb
2023-06-06N3F0423-01PPS38.0 ppb
2023-06-06N3F0423-03PPS22.0 ppb
2023-06-06N3F0423-06RE1PPS34.0 ppb
2023-06-06N3F0423-08PPS17.0 ppb
2023-06-06N3F0423-0322.0 ppb
2023-06-06N3F0423-06RE134.0 ppb
2023-06-06N3F0423-0138.0 ppb
2023-06-06N3F0423-0817.0 ppb
2023-06-07N3F0423-0221.0 ppb
2023-06-07N3F0423-0737.0 ppb
2023-06-07N3F0423-0435.0 ppb
2023-06-08N3F0423-0532.0 ppb
2023-09-12CO9998239.0 ppb
2023-09-12CO9998326.0 ppb
2023-09-12CO9998923.0 ppb
2023-09-13CO9998646.0 ppb
2023-09-13CO9998741.0 ppb
2023-09-13CO9998853.0 ppb
2023-09-14CO9998422.0 ppb
2023-09-14CO9998544.0 ppb
2023-12-11CP6821321.0 ppb
2023-12-12CP6821429.0 ppb
2023-12-12CP6821141.0 ppb
2023-12-12CP6821218.0 ppb
2023-12-12CP6821633.0 ppb
2023-12-12CP6821740.0 ppb
2023-12-12CP6821824.0 ppb
2023-12-13CP6821523.0 ppb