Chloroform
Beachwood 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.631 ppb | 16 | 16 | 0.300 ppb - 0.940 ppb |
| 2015 | 0.765 ppb | 16 | 16 | 0.240 ppb - 1.79 ppb |
| 2016 | 1.60 ppb | 16 | 16 | 0.270 ppb - 9.87 ppb |
| 2017 | 0.831 ppb | 16 | 12 | ND - 2.45 ppb |
| 2018 | 1.81 ppb | 16 | 16 | 0.780 ppb - 2.93 ppb |
| 2019 | 3.09 ppb | 16 | 16 | 0.540 ppb - 11.4 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 |
|---|---|---|
| 2014-03-06 | A16227 | 0.620 ppb |
| 2014-03-06 | A16224 | 0.660 ppb |
| 2014-03-06 | A16226 | 0.490 ppb |
| 2014-03-06 | A16225 | 0.820 ppb |
| 2014-06-04 | A16715 | 0.900 ppb |
| 2014-06-04 | A16716 | 0.530 ppb |
| 2014-06-04 | A16714 | 0.910 ppb |
| 2014-06-04 | A16717 | 0.750 ppb |
| 2014-09-03 | A17413 | 0.940 ppb |
| 2014-09-03 | A17414 | 0.400 ppb |
| 2014-09-03 | A17412 | 0.650 ppb |
| 2014-09-03 | A17415 | 0.730 ppb |
| 2014-12-02 | A17970 | 0.300 ppb |
| 2014-12-02 | A17969 | 0.460 ppb |
| 2014-12-02 | A17968 | 0.330 ppb |
| 2014-12-02 | A17971 | 0.600 ppb |
| 2015-03-02 | A18546 | 0.540 ppb |
| 2015-03-02 | A18544 | 0.620 ppb |
| 2015-03-02 | A18543 | 0.540 ppb |
| 2015-03-02 | A18545 | 0.240 ppb |
| 2015-06-01 | A19131 | 0.500 ppb |
| 2015-06-01 | A19128 | 0.410 ppb |
| 2015-06-01 | A19129 | 0.660 ppb |
| 2015-06-01 | A19130 | 0.280 ppb |
| 2015-09-02 | A19769 | 1.79 ppb |
| 2015-09-02 | A19766 | 1.47 ppb |
| 2015-09-02 | A19767 | 1.54 ppb |
| 2015-09-02 | A19768 | 0.680 ppb |
| 2015-12-01 | A20386 | 0.580 ppb |
| 2015-12-01 | A20389 | 0.760 ppb |
| 2015-12-01 | A20387 | 1.30 ppb |
| 2015-12-01 | A20388 | 0.330 ppb |
| 2016-03-01 | A220963 | 0.790 ppb |
| 2016-03-01 | A20960 | 0.640 ppb |
| 2016-03-01 | A20962 | 0.270 ppb |
| 2016-03-01 | A20961 | 0.570 ppb |
| 2016-06-01 | A21609 | 1.03 ppb |
| 2016-06-01 | A21611 | 0.330 ppb |
| 2016-06-01 | A21612 | 1.07 ppb |
| 2016-06-01 | A21610 | 3.69 ppb |
| 2016-09-01 | A22312 | 2.28 ppb |
| 2016-09-01 | A22314 | 0.600 ppb |
| 2016-09-01 | A22315 | 1.54 ppb |
| 2016-09-01 | A22313 | 9.87 ppb |
| 2016-12-02 | A22878 | 0.650 ppb |
| 2016-12-02 | A22877 | 0.650 ppb |
| 2016-12-02 | A22880 | 1.25 ppb |
| 2016-12-02 | A22879 | 0.380 ppb |
| 2017-03-01 | A23439 | 1.07 ppb |
| 2017-03-01 | A23437 | 0.700 ppb |
| 2017-03-01 | A23440 | 1.08 ppb |
| 2017-03-01 | A23438 | 1.06 ppb |
| 2017-06-01 | A24081 | 1.84 ppb |
| 2017-06-01 | A24080 | 0.440 ppb |
| 2017-06-01 | A24078 | 2.45 ppb |
| 2017-06-01 | A24079 | 1.21 ppb |
| 2017-09-01 | A24763 | ND |
| 2017-09-01 | A24762 | ND |
| 2017-09-01 | A24764 | ND |
| 2017-09-28 | A24910 | 0.630 ppb |
| 2017-12-01 | A25320 | 1.09 ppb |
| 2017-12-01 | A25322 | 0.930 ppb |
| 2017-12-01 | A25321 | ND |
| 2017-12-01 | A25319 | 0.790 ppb |
| 2018-03-02 | A25812 | 1.32 ppb |
| 2018-03-02 | A25809 | 0.780 ppb |
| 2018-03-02 | A25810 | 0.880 ppb |
| 2018-03-02 | A25811 | 0.800 ppb |
| 2018-06-01 | A26368 | 1.82 ppb |
| 2018-06-01 | A26365 | 2.68 ppb |
| 2018-06-01 | A26367 | 1.16 ppb |
| 2018-06-01 | A26366 | 1.67 ppb |
| 2018-09-01 | A27078 | 1.41 ppb |
| 2018-09-01 | A27077 | 2.67 ppb |
| 2018-09-01 | A27079 | 1.43 ppb |
| 2018-09-01 | A27076 | 1.73 ppb |
| 2018-12-03 | A27725 | 2.13 ppb |
| 2018-12-03 | A27724 | 2.93 ppb |
| 2018-12-03 | A27726 | 2.80 ppb |
| 2018-12-03 | A27723 | 2.71 ppb |
| 2019-03-04 | A28231 | 1.07 ppb |
| 2019-03-04 | A28234 | 6.24 ppb |
| 2019-03-04 | A28232 | 1.62 ppb |
| 2019-03-04 | A28233 | 0.540 ppb |
| 2019-06-03 | A28745 | 2.80 ppb |
| 2019-06-03 | A28744 | 0.690 ppb |
| 2019-06-03 | A28742 | 0.870 ppb |
| 2019-06-03 | A28743 | 6.64 ppb |
| 2019-09-03 | A29417 | 4.75 ppb |
| 2019-09-03 | A29414 | 2.94 ppb |
| 2019-09-03 | A29415 | 11.4 ppb |
| 2019-09-03 | A29416 | 3.12 ppb |
| 2019-12-03 | 3-A30023 | 1.67 ppb |
| 2019-12-03 | 3-A30024 | 3.12 ppb |
| 2019-12-03 | 3-A30025 | 0.590 ppb |
| 2019-12-03 | 3-A30026 | 1.30 ppb |