Know Your Environment. Protect Your Health.

Chloroform

Central Wy Regional Water System Jpb

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.

 

187

Samples

0

Samples exceeding legal limit (MCL)

177

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.79 ppb3736ND - 12.0 ppb
2019N/A00N/A
20201.71 ppb3836ND - 16.0 ppb
20212.11 ppb3834ND - 17.0 ppb
20222.88 ppb3736ND - 20.0 ppb
20233.20 ppb3735ND - 29.0 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
2018-01-09C18010249-002A2.80 ppb
2018-01-09C18010249-003A5.50 ppb
2018-01-09C18010249-004A4.80 ppb
2018-01-09C18010249-005A4.10 ppb
2018-01-09C18010249-006A4.70 ppb
2018-01-09C18010249-007A3.90 ppb
2018-01-09C18010249-009A4.00 ppb
2018-01-09C18010249-011A4.30 ppb
2018-01-09C18010249-001A3.90 ppb
2018-04-03C18040084-009A1.70 ppb
2018-04-03C18040084-007A3.20 ppb
2018-04-03C18040084-006A3.10 ppb
2018-04-03C18040084-005A2.40 ppb
2018-04-03C18040084-011A1.90 ppb
2018-04-03C18040084-003A1.90 ppb
2018-04-03C18040084-002A2.30 ppb
2018-04-03C18040084-001A0.710 ppb
2018-04-03C18040084-004A3.70 ppb
2018-06-27C18060967-001DND
2018-07-03C18070084-011A1.000 ppb
2018-07-03C18070084-009A1.30 ppb
2018-07-03C18070084-007A2.40 ppb
2018-07-03C18070084-006A4.30 ppb
2018-07-03C18070084-005A2.30 ppb
2018-07-03C18070084-004A7.60 ppb
2018-07-03C18070084-003A3.00 ppb
2018-07-03C18070084-001A4.10 ppb
2018-07-03C18070084-002A2.00 ppb
2018-10-10C18100435-001A5.60 ppb
2018-10-10C18100435-002A1.80 ppb
2018-10-10C18100435-003A8.40 ppb
2018-10-10C18100435-004A12.0 ppb
2018-10-10C18100435-011A6.60 ppb
2018-10-10C18100435-006A4.80 ppb
2018-10-10C18100435-007A3.30 ppb
2018-10-10C18100435-009A5.50 ppb
2018-10-10C18100435-005A5.20 ppb
2020-01-07C20010181-002A0.890 ppb
2020-01-07C20010181-001A1.40 ppb
2020-01-07C20010181-003A1.80 ppb
2020-01-07C20010181-005A1.50 ppb
2020-01-07C20010181-004A2.00 ppb
2020-01-07C20010181-009A1.30 ppb
2020-01-07C20010181-007A1.50 ppb
2020-01-07C20010181-006A1.80 ppb
2020-01-07C20010181-011A1.50 ppb
2020-04-07C20040283-001A1.20 ppb
2020-04-07C20040283-002A1.30 ppb
2020-04-07C20040283-004A1.80 ppb
2020-04-07C20040283-003A1.60 ppb
2020-04-07C20040283-005A1.60 ppb
2020-04-07C20040283-006A2.00 ppb
2020-04-07C20040283-007A1.60 ppb
2020-04-07C20040283-009A1.40 ppb
2020-04-07C20040283-011A1.50 ppb
2020-06-16C20060760-001LND
2020-06-16C20060760-002LND
2020-07-07C20070317-006A1.30 ppb
2020-07-07C20070317-007A0.970 ppb
2020-07-07C20070317-005A0.930 ppb
2020-07-07C20070317-001A1.50 ppb
2020-07-07C20070317-002A1.30 ppb
2020-07-07C20070317-003A1.50 ppb
2020-07-07C20070317-004A1.90 ppb
2020-07-07C20070317-011A0.530 ppb
2020-07-07C20070317-009A0.690 ppb
2020-10-06C20100255-003A1.70 ppb
2020-10-06C20100255-005A1.000 ppb
2020-10-06C20100255-006A1.50 ppb
2020-10-06C20100255-007A1.10 ppb
2020-10-06C20100255-004A16.0 ppb
2020-10-06C20100255-011A1.80 ppb
2020-10-06C20100255-001A1.50 ppb
2020-10-06C20100255-002A1.30 ppb
2020-10-06C20100255-009A0.660 ppb
2021-01-05C21010107-011A2.00 ppb
2021-01-05C21010107-009A1.60 ppb
2021-01-05C21010107-007A1.60 ppb
2021-01-05C21010107-006A2.00 ppb
2021-01-05C21010107-005A1.80 ppb
2021-01-05C21010107-004A2.90 ppb
2021-01-05C21010107-003A2.50 ppb
2021-01-05C21010107-001A1.80 ppb
2021-01-05C21010107-002A1.70 ppb
2021-04-06C21040206-009A1.70 ppb
2021-04-06C21040206-007A2.00 ppb
2021-04-06C21040206-006A3.30 ppb
2021-04-06C21040206-005A2.00 ppb
2021-04-06C21040206-011A1.70 ppb
2021-04-06C21040206-003A2.20 ppb
2021-04-06C21040206-002A2.00 ppb
2021-04-06C21040206-001A1.50 ppb
2021-04-06C21040206-004A8.10 ppb
2021-07-06C21070162-004A1.20 ppb
2021-07-06C21070162-005A0.630 ppb
2021-07-06C21070162-006A0.750 ppb
2021-07-06C21070162-007A0.730 ppb
2021-07-06C21070162-009AND
2021-07-06C21070162-011AND
2021-07-06C21070162-001A0.550 ppb
2021-07-06C21070162-002A1.10 ppb
2021-07-06C21070162-003A0.830 ppb
2021-07-07C21070206-001FND
2021-07-07C21070206-002FND
2021-10-05C21100137-001A1.70 ppb
2021-10-05C21100137-002A2.80 ppb
2021-10-05C21100137-003A2.50 ppb
2021-10-05C21100137-004A17.0 ppb
2021-10-05C21100137-011A2.00 ppb
2021-10-05C21100137-006A1.20 ppb
2021-10-05C21100137-007A1.30 ppb
2021-10-05C21100137-009A2.00 ppb
2021-10-05C21100137-005A1.60 ppb
2022-01-04C22010087-006A3.00 ppb
2022-01-04C22010087-007A2.10 ppb
2022-01-04C22010087-009A2.10 ppb
2022-01-04C22010087-011A2.10 ppb
2022-01-04C22010087-002A2.70 ppb
2022-01-04C22010087-004A7.40 ppb
2022-01-04C22010087-005A2.10 ppb
2022-01-04C22010087-001A2.10 ppb
2022-01-04C22010087-003A2.50 ppb
2022-04-05C22040150-002A1.80 ppb
2022-04-05C22040150-003A1.50 ppb
2022-04-05C22040150-004A6.90 ppb
2022-04-05C22040150-005A1.20 ppb
2022-04-05C22040150-006A1.60 ppb
2022-04-05C22040150-007A1.70 ppb
2022-04-05C22040150-009A1.30 ppb
2022-04-05C22040150-011A1.30 ppb
2022-04-05C22040150-001A1.10 ppb
2022-07-05C22070093-001A1.40 ppb
2022-07-05C22070093-007A0.600 ppb
2022-07-05C22070093-003A1.20 ppb
2022-07-05C22070093-004A10.00 ppb
2022-07-05C22070093-005A0.710 ppb
2022-07-05C22070093-006A1.000 ppb
2022-07-05C22070093-002A1.60 ppb
2022-07-05C22070093-009A0.530 ppb
2022-07-05C22070093-011A0.610 ppb
2022-07-27C22070992-001END
2022-10-04C22100124-001A1.60 ppb
2022-10-04C22100124-011A1.20 ppb
2022-10-04C22100124-009A3.90 ppb
2022-10-04C22100124-005A1.60 ppb
2022-10-04C22100124-004A20.0 ppb
2022-10-04C22100124-006A2.70 ppb
2022-10-04C22100124-002A3.70 ppb
2022-10-04C22100124-003A5.20 ppb
2022-10-04C22100124-007A4.50 ppb
2023-01-03C23010027-003A3.10 ppb
2023-01-03C23010027-002A3.00 ppb
2023-01-03C23010027-001A2.20 ppb
2023-01-03C23010027-009A2.80 ppb
2023-01-03C23010027-007A2.90 ppb
2023-01-03C23010027-005A2.30 ppb
2023-01-03C23010027-006A2.90 ppb
2023-01-03C23010027-004A5.70 ppb
2023-01-03C23010027-011A2.30 ppb
2023-04-06C23040048-004A6.50 ppb
2023-04-06C23040048-005A0.530 ppb
2023-04-06C23040048-006A1.40 ppb
2023-04-06C23040048-007A1.50 ppb
2023-04-06C23040048-009A1.20 ppb
2023-04-06C23040048-011A0.920 ppb
2023-04-06C23040048-001A0.840 ppb
2023-04-06C23040048-002A1.70 ppb
2023-04-06C23040048-003A1.50 ppb
2023-07-05C23070053-002A2.40 ppb
2023-07-05C23070053-011A0.630 ppb
2023-07-05C23070053-009A0.980 ppb
2023-07-05C23070053-007A1.40 ppb
2023-07-05C23070053-001A1.40 ppb
2023-07-05C23070053-005AND
2023-07-05C23070053-004A21.0 ppb
2023-07-05C23070053-003A1.60 ppb
2023-07-05C23070053-006A1.70 ppb
2023-08-03C23080223-001AND
2023-10-03C23100133-001A2.80 ppb
2023-10-03C23100133-002A2.30 ppb
2023-10-03C23100133-011A1.30 ppb
2023-10-03C23100133-009A1.20 ppb
2023-10-03C23100133-007A1.20 ppb
2023-10-03C23100133-006A1.70 ppb
2023-10-03C23100133-005A2.40 ppb
2023-10-03C23100133-003A2.10 ppb
2023-10-03C23100133-004A29.0 ppb