Know Your Environment. Protect Your Health.

Chloroform

Marion Water 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.

 

64

Samples

0

Samples exceeding legal limit (MCL)

54

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.69 ppb16161.40 ppb - 2.00 ppb
20191.81 ppb16161.000 ppb - 2.90 ppb
2020ND80ND
20210.463 ppb86ND - 1.20 ppb
20221.27 ppb880.740 ppb - 2.60 ppb
20230.993 ppb880.680 ppb - 1.10 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
2018-03-01353778230011.60 ppb
2018-03-01353778230021.50 ppb
2018-03-01353778230021.50 ppb
2018-03-01353778230011.60 ppb
2018-06-19353998700021.80 ppb
2018-06-19353998700011.90 ppb
2018-06-19353998700021.80 ppb
2018-06-19353998700011.90 ppb
2018-09-18354194260012.00 ppb
2018-09-18354194260021.80 ppb
2018-09-18354194260012.00 ppb
2018-09-18354194260021.80 ppb
2018-12-17354384950011.50 ppb
2018-12-17354384950011.50 ppb
2018-12-17354384950021.40 ppb
2018-12-17354384950021.40 ppb
2019-03-18354563010011.000 ppb
2019-03-18354563010021.70 ppb
2019-03-18354563010011.000 ppb
2019-03-18354563010021.70 ppb
2019-06-11354755310011.70 ppb
2019-06-11354755310021.70 ppb
2019-06-11354755310011.70 ppb
2019-06-11354755310021.70 ppb
2019-09-06354956730022.30 ppb
2019-09-06354956730012.90 ppb
2019-09-06354956730012.90 ppb
2019-09-06354956730022.30 ppb
2019-12-05355169190011.70 ppb
2019-12-05355169190021.50 ppb
2019-12-05355169190021.50 ppb
2019-12-05355169190011.70 ppb
2020-03-1835538798002ND
2020-03-1835538798001ND
2020-06-1235556376001ND
2020-06-1235556376002ND
2020-09-1035577331001ND
2020-09-1035577331002ND
2020-12-1035598493001ND
2020-12-1035598493002ND
2021-03-10356187470010.460 ppb
2021-03-10356187470021.20 ppb
2021-06-04356385490010.500 ppb
2021-06-04356385490020.480 ppb
2021-09-09356632030010.560 ppb
2021-09-09356632030020.500 ppb
2021-12-0235681959001ND
2021-12-0235681959002ND
2022-03-04357014580021.50 ppb
2022-03-04357014580011.30 ppb
2022-06-20357272120021.000 ppb
2022-06-20357272120011.10 ppb
2022-09-21357492100011.10 ppb
2022-09-21357492100022.60 ppb
2022-12-15357678950010.740 ppb
2022-12-15357678950020.820 ppb
2023-03-23357881200010.680 ppb
2023-03-23357881200020.900 ppb
2023-06-27358099750011.10 ppb
2023-06-27358099750020.960 ppb
2023-09-27358309910011.10 ppb
2023-09-27358309910021.10 ppb
2023-12-14358497030011.000 ppb
2023-12-14358497030021.10 ppb