Know Your Environment. Protect Your Health.

Chloroform

Connecticut Water Company - Northern Region-Western System

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.

 

218

Samples

0

Samples exceeding legal limit (MCL)

203

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201834.9 ppb3836ND - 82.0 ppb
201925.5 ppb3433ND - 51.0 ppb
202024.2 ppb3834ND - 61.6 ppb
202130.5 ppb3433ND - 62.9 ppb
202225.7 ppb4034ND - 55.0 ppb
202329.3 ppb3433ND - 60.0 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
2018-01-23BZ78888VOC110.00 ppb
2018-01-31BZ82950VOC1ND
2018-02-01BZ83504TTHM28.0 ppb
2018-02-01BZ83505TTHM42.0 ppb
2018-02-01BZ83506TTHM38.0 ppb
2018-02-01BZ83507TTHM48.0 ppb
2018-02-01BZ83508TTHM17.0 ppb
2018-02-01BZ83509TTHM20.0 ppb
2018-02-01BZ83510TTHM18.0 ppb
2018-02-21BZ93283TTHM22.0 ppb
2018-05-03CA41161TTHM26.0 ppb
2018-05-03CA41162TTHM49.0 ppb
2018-05-03CA41163TTHM42.0 ppb
2018-05-03CA41164TTHM54.0 ppb
2018-05-03CA41165TTHM13.0 ppb
2018-05-03CA41166TTHM18.0 ppb
2018-05-03CA41167TTHM19.0 ppb
2018-05-03D8E0468-01VOC48.9 ppb
2018-05-15CA48118TTHM33.0 ppb
2018-07-13CA89901ND
2018-08-02CB0402031.0 ppb
2018-08-02CB0402182.0 ppb
2018-08-02CB0402248.0 ppb
2018-08-02CB0402364.0 ppb
2018-08-02CB0402426.0 ppb
2018-08-02CB0402538.0 ppb
2018-08-02CB0402639.0 ppb
2018-08-06CB0584043.0 ppb
2018-08-10DBP 20050203163.7 ppb
2018-08-10CB0915468.0 ppb
2018-11-01DBP 20051113336.2 ppb
2018-11-01DBP 20051113453.8 ppb
2018-11-01DBP 20051113555.9 ppb
2018-11-01DBP 20051113662.4 ppb
2018-11-01DBP 20051113720.6 ppb
2018-11-01DBP 20051113812.4 ppb
2018-11-01DBP 20051113915.3 ppb
2018-11-05DBP 20051138921.5 ppb
2019-01-02VOC1 2005173097.90 ppb
2019-02-07DBP 2005210838.60 ppb
2019-02-07DBP 20052108429.1 ppb
2019-02-07DBP 2005210858.90 ppb
2019-02-07DBP 20052108624.9 ppb
2019-02-07DBP 2005210878.90 ppb
2019-02-07DBP 20052108831.3 ppb
2019-02-07DBP 20052108919.8 ppb
2019-02-11DBP 20052125613.1 ppb
2019-03-15VOC1 200524883ND
2019-05-09DBP 20053157522.1 ppb
2019-05-09DBP 20053157646.8 ppb
2019-05-09DBP 20053157743.0 ppb
2019-05-09DBP 20053158251.0 ppb
2019-05-09DBP 20053158413.9 ppb
2019-05-09DBP 20053158612.8 ppb
2019-05-09DBP 20053158712.7 ppb
2019-05-13DBP 20053183719.9 ppb
2019-08-01DBP 20054272219.9 ppb
2019-08-01DBP 20054272333.7 ppb
2019-08-01DBP 20054272422.4 ppb
2019-08-01DBP 20054272549.0 ppb
2019-08-01DBP 20054272625.2 ppb
2019-08-01DBP 20054272716.2 ppb
2019-08-01DBP 20054272814.9 ppb
2019-08-13DBP 20054475834.6 ppb
2019-11-07DBP 20055582845.7 ppb
2019-11-07DBP 20055583050.1 ppb
2019-11-07DBP 20055583143.4 ppb
2019-11-07DBP 20055583249.3 ppb
2019-11-07DBP 20055583332.7 ppb
2019-11-07DBP 20055583418.3 ppb
2019-11-07DBP 20055583514.7 ppb
2019-11-18DBP 20055700421.6 ppb
2020-01-02VOC1 2005615046.10 ppb
2020-01-06DBP 20056166519.2 ppb
2020-02-06DBP 20056535739.3 ppb
2020-02-06DBP 20056535835.8 ppb
2020-02-06DBP 20056535929.0 ppb
2020-02-06DBP 20056536023.1 ppb
2020-02-06DBP 20056536112.9 ppb
2020-02-06DBP 2005653628.90 ppb
2020-02-07DBP 20056564047.2 ppb
2020-02-07DBP 20056564117.1 ppb
2020-05-07DBP 20057517142.8 ppb
2020-05-07DBP 20057517515.8 ppb
2020-05-07DBP 20057517612.8 ppb
2020-05-07DBP 20057517724.3 ppb
2020-05-07DBP 20057517361.6 ppb
2020-05-08DBP 20057517427.0 ppb
2020-05-08DBP 20057517231.5 ppb
2020-05-08DBP 20057517055.0 ppb
2020-06-29VOC1 200580772ND
2020-08-06DBP 20058574423.9 ppb
2020-08-06DBP 20058575043.1 ppb
2020-08-06DBP 20058575333.6 ppb
2020-08-06DBP 20058575434.8 ppb
2020-08-07DBP 20058575552.1 ppb
2020-08-07DBP 20058575619.2 ppb
2020-08-07DBP 20058575721.1 ppb
2020-08-07DBP 20058575835.2 ppb
2020-08-11VOC1 200586573ND
2020-09-21VOC1 200591014ND
2020-10-07VOC1 200593218ND
2020-11-05DBP 2005973569.20 ppb
2020-11-05DBP 20059735744.9 ppb
2020-11-05DBP 20059735818.8 ppb
2020-11-05DBP 2005973595.10 ppb
2020-11-05DBP 2005973604.30 ppb
2020-11-05DBP 2005973619.30 ppb
2020-11-12DBP 20059820630.6 ppb
2020-11-12DBP 20059821023.5 ppb
2021-02-11DBP 2006068958.40 ppb
2021-02-11DBP 20060689612.6 ppb
2021-02-11DBP 2006069075.50 ppb
2021-02-12DBP 20060691114.4 ppb
2021-02-16DBP 20060691237.7 ppb
2021-02-17DBP 20060711219.5 ppb
2021-02-22DBP 2006074598.30 ppb
2021-02-23DBP 20060764524.8 ppb
2021-03-05VOC1 2006087075.40 ppb
2021-05-13DBP 20061723930.8 ppb
2021-05-14DBP 20061723641.6 ppb
2021-05-14DBP 20061723718.5 ppb
2021-05-14DBP 20061723814.4 ppb
2021-05-20DBP 20061831652.9 ppb
2021-05-20DBP 20061831719.4 ppb
2021-05-20DBP 20061831942.6 ppb
2021-05-20DBP 20061832146.3 ppb
2021-08-12DBP 20062875645.3 ppb
2021-08-12DBP 20062875722.7 ppb
2021-08-12DBP 20062875862.9 ppb
2021-08-12DBP 20062875925.9 ppb
2021-08-12DBP 20062876031.7 ppb
2021-08-12DBP 20062876140.4 ppb
2021-08-25DBP 20062981552.9 ppb
2021-08-25DBP 20062981660.4 ppb
2021-09-14300059932 300059934ND
2021-11-04D300098348 30009835733.1 ppb
2021-11-04D300098349 30009835916.3 ppb
2021-11-04D300098350 30009836158.6 ppb
2021-11-04D300098351 30009836313.0 ppb
2021-11-04D300098352 30009836523.1 ppb
2021-11-05D300098353 30009836738.5 ppb
2021-11-05D300098354 30009836962.5 ppb
2021-11-05D300098355 30009837147.0 ppb
2022-01-24CK22294ND
2022-01-25CK231750.570 ppb
2022-01-25CK23176ND
2022-02-01CK274287.70 ppb
2022-02-03CK2975224.0 ppb
2022-02-03CK2975317.0 ppb
2022-02-03CK2975449.0 ppb
2022-02-03CK2975519.0 ppb
2022-02-03CK2975628.0 ppb
2022-02-03CK2975729.0 ppb
2022-02-03CK2975839.0 ppb
2022-02-04CK3148955.0 ppb
2022-02-16CK69359ND
2022-05-12CL3151326.0 ppb
2022-05-12CL3151451.0 ppb
2022-05-12CL3151519.0 ppb
2022-05-12CL3151632.0 ppb
2022-05-12CL3151719.0 ppb
2022-05-13CL3151837.0 ppb
2022-05-13CL3151935.0 ppb
2022-05-13CL3152036.0 ppb
2022-08-04CL9896346.0 ppb
2022-08-04CL9896439.0 ppb
2022-08-04CL9896549.0 ppb
2022-08-05CL9896644.0 ppb
2022-08-05CL9896741.0 ppb
2022-08-05CL9896844.0 ppb
2022-08-05CL9896950.0 ppb
2022-08-05CL9897033.0 ppb
2022-08-26CM16199ND
2022-09-08CM25672ND
2022-09-20CM37295ND
2022-11-17CM9028325.0 ppb
2022-11-17CM9028412.0 ppb
2022-11-17CM9028531.0 ppb
2022-11-17CM9028615.0 ppb
2022-11-17CM9028724.0 ppb
2022-11-17CM9028817.0 ppb
2022-11-17CM9028916.0 ppb
2022-11-18CM9029020.0 ppb
2023-01-17CN242385.10 ppb
2023-02-02CN3707712.0 ppb
2023-02-02CN3707818.0 ppb
2023-02-02CN3707927.0 ppb
2023-02-02CN3708012.0 ppb
2023-02-02CN3708119.0 ppb
2023-02-02CN3708219.0 ppb
2023-02-02CN3708325.0 ppb
2023-02-02CN3708421.0 ppb
2023-05-12CO0629423.0 ppb
2023-05-12CO0629557.0 ppb
2023-05-12CO0629625.0 ppb
2023-05-12CO0629739.0 ppb
2023-05-12CO0629844.0 ppb
2023-05-12CO0629945.0 ppb
2023-05-18CO0938635.0 ppb
2023-05-18CO0938748.0 ppb
2023-08-10CO7337628.0 ppb
2023-08-10CO7337754.0 ppb
2023-08-10CO7337860.0 ppb
2023-08-11CO7337928.0 ppb
2023-08-11CO7338037.0 ppb
2023-08-11CO7338140.0 ppb
2023-08-11CO7338241.0 ppb
2023-08-11CO7338357.0 ppb
2023-11-16CP5044927.0 ppb
2023-11-16CP5045021.0 ppb
2023-11-16CP5045132.0 ppb
2023-11-16CP5045217.0 ppb
2023-11-16CP5045314.0 ppb
2023-11-16CP5045430.0 ppb
2023-11-16CP5045513.0 ppb
2023-11-17CP5045622.0 ppb
2023-12-13CP67269ND