Chloroform
City of Toledo
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 28.4 ppb | 48 | 48 | 6.60 ppb - 64.8 ppb |
2015 | 28.1 ppb | 48 | 48 | 5.10 ppb - 79.7 ppb |
2016 | 17.1 ppb | 48 | 48 | 3.20 ppb - 41.6 ppb |
2017 | 21.4 ppb | 48 | 48 | 8.40 ppb - 48.5 ppb |
2018 | 18.9 ppb | 48 | 48 | 4.40 ppb - 42.4 ppb |
2019 | 40.9 ppb | 36 | 36 | 11.7 ppb - 79.3 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 |
---|---|---|
2014-02-11 | 14-11872-01 | 53.6 ppb |
2014-02-11 | 14-11872-02 | 43.0 ppb |
2014-02-11 | 14-11872-03 | 23.5 ppb |
2014-02-11 | 14-11872-04 | 35.0 ppb |
2014-02-11 | 14-11872-05 | 22.7 ppb |
2014-02-11 | 14-11872-06 | 27.0 ppb |
2014-02-11 | 14-11872-07 | 24.8 ppb |
2014-02-11 | 14-11872-08 | 24.8 ppb |
2014-02-11 | 14-11872-09 | 27.1 ppb |
2014-02-11 | 14-11872-10 | 28.6 ppb |
2014-02-11 | 14-11872-11 | 24.6 ppb |
2014-02-11 | 14-11872-12 | 45.5 ppb |
2014-05-13 | 14-16097-02 | 39.9 ppb |
2014-05-13 | 14-16097-03 | 24.4 ppb |
2014-05-13 | 14-16097-04 | 38.3 ppb |
2014-05-13 | 14-16097-05 | 25.9 ppb |
2014-05-13 | 14-16097-06 | 24.9 ppb |
2014-05-13 | 14-16097-07 | 23.5 ppb |
2014-05-13 | 14-16097-08 | 25.2 ppb |
2014-05-13 | 14-16097-09 | 32.7 ppb |
2014-05-13 | 14-16097-10 | 42.0 ppb |
2014-05-13 | 14-16097-11 | 30.4 ppb |
2014-05-13 | M14-16097-01 | 64.8 ppb |
2014-05-13 | M14-16097-12 | 61.1 ppb |
2014-08-12 | 14-21036-01 | 46.6 ppb |
2014-08-12 | 14-21036-02 | 44.1 ppb |
2014-08-12 | 14-21036-03 | 17.8 ppb |
2014-08-12 | 14-21036-04 | 44.0 ppb |
2014-08-12 | 14-21036-05 | 22.8 ppb |
2014-08-12 | 14-21036-06 | 15.2 ppb |
2014-08-12 | 14-21036-07 | 17.5 ppb |
2014-08-12 | 14-21036-08 | 23.6 ppb |
2014-08-12 | 14-21036-09 | 32.1 ppb |
2014-08-12 | 14-21036-10 | 28.6 ppb |
2014-08-12 | 14-21036-11 | 21.3 ppb |
2014-08-12 | 14-21036-12 | 47.6 ppb |
2014-11-10 | 14-25594-01 | 27.2 ppb |
2014-11-10 | 14-25594-02 | 23.0 ppb |
2014-11-10 | 14-25594-03 | 8.40 ppb |
2014-11-10 | 14-25594-04 | 18.3 ppb |
2014-11-10 | 14-25594-05 | 12.5 ppb |
2014-11-10 | 14-25594-06 | 15.6 ppb |
2014-11-10 | 14-25594-07 | 6.60 ppb |
2014-11-10 | 14-25594-08 | 13.6 ppb |
2014-11-10 | 14-25594-09 | 14.8 ppb |
2014-11-10 | 14-25594-10 | 15.1 ppb |
2014-11-10 | 14-25594-11 | 9.20 ppb |
2014-11-10 | 14-25594-12 | 25.0 ppb |
2015-02-10 | 15-11859-01 | 30.2 ppb |
2015-02-10 | 15-11859-02 | 24.8 ppb |
2015-02-10 | 15-11859-03 | 7.70 ppb |
2015-02-10 | 15-11859-04 | 15.9 ppb |
2015-02-10 | 15-11859-05 | 9.40 ppb |
2015-02-10 | 15-11859-06 | 8.50 ppb |
2015-02-10 | 15-11859-07 | 6.20 ppb |
2015-02-10 | 15-11859-08 | 9.40 ppb |
2015-02-10 | 15-11859-09 | 9.40 ppb |
2015-02-10 | 15-11859-10 | 9.90 ppb |
2015-02-10 | 15-11859-11 | 6.60 ppb |
2015-02-10 | 15-11859-12 | 26.3 ppb |
2015-05-12 | 15-16360-01 | 22.1 ppb |
2015-05-12 | 15-16360-02 | 22.3 ppb |
2015-05-12 | 15-16360-03 | 14.8 ppb |
2015-05-12 | 15-16360-04 | 18.1 ppb |
2015-05-12 | 15-16360-05 | 14.6 ppb |
2015-05-12 | 15-16360-06 | 12.2 ppb |
2015-05-12 | 15-16360-07 | 11.1 ppb |
2015-05-12 | 15-16360-08 | 15.6 ppb |
2015-05-12 | 15-16360-09 | 15.4 ppb |
2015-05-12 | 15-16360-10 | 15.4 ppb |
2015-05-12 | 15-16360-11 | 14.0 ppb |
2015-05-12 | 15-16360-12 | 27.1 ppb |
2015-08-13 | 15-21644-01 | 75.0 ppb |
2015-08-13 | 15-21644-02 | 77.7 ppb |
2015-08-13 | 15-21644-03 | 74.4 ppb |
2015-08-13 | 15-21644-04 | 74.8 ppb |
2015-08-13 | 15-21644-05 | 72.5 ppb |
2015-08-13 | 15-21644-06 | 70.1 ppb |
2015-08-13 | 15-21644-07 | 75.2 ppb |
2015-08-13 | 15-21644-08 | 70.3 ppb |
2015-08-13 | 15-21644-09 | 79.7 ppb |
2015-08-13 | 15-21644-10 | 77.3 ppb |
2015-08-13 | 15-21644-11 | 71.2 ppb |
2015-08-13 | 15-21644-12 | 68.8 ppb |
2015-11-10 | 15-26831-01 | 5.10 ppb |
2015-11-10 | 15-26831-02 | 15.0 ppb |
2015-11-10 | 15-26831-03 | 6.00 ppb |
2015-11-10 | 15-26831-04 | 10.8 ppb |
2015-11-10 | 15-26831-05 | 5.10 ppb |
2015-11-10 | 15-26831-06 | 6.20 ppb |
2015-11-10 | 15-26831-07 | 6.10 ppb |
2015-11-10 | 15-26831-08 | 6.00 ppb |
2015-11-10 | 15-26831-09 | 7.40 ppb |
2015-11-10 | 15-26831-10 | 7.30 ppb |
2015-11-10 | 15-26831-11 | 5.10 ppb |
2015-11-10 | 15-26831-12 | 15.0 ppb |
2016-02-09 | 16-12163-01 | 7.40 ppb |
2016-02-09 | 16-12163-02 | 14.6 ppb |
2016-02-09 | 16-12163-03 | 3.60 ppb |
2016-02-09 | 16-12163-04 | 11.1 ppb |
2016-02-09 | 16-12163-05 | 5.90 ppb |
2016-02-09 | 16-12163-06 | 3.20 ppb |
2016-02-09 | 16-12163-07 | 3.40 ppb |
2016-02-09 | 16-12163-08 | 6.60 ppb |
2016-02-09 | 16-12163-09 | 8.50 ppb |
2016-02-09 | 16-12163-10 | 6.70 ppb |
2016-02-09 | 16-12163-11 | 4.50 ppb |
2016-02-09 | 16-12163-12 | 17.1 ppb |
2016-05-09 | 16-16961-01 | 23.4 ppb |
2016-05-09 | 16-16961-02 | 24.1 ppb |
2016-05-09 | 16-16961-03 | 29.1 ppb |
2016-05-09 | 16-16961-04 | 21.2 ppb |
2016-05-09 | 16-16961-05 | 25.6 ppb |
2016-05-09 | 16-16961-06 | 27.6 ppb |
2016-05-09 | 16-16961-07 | 21.9 ppb |
2016-05-09 | 16-16961-08 | 26.6 ppb |
2016-05-09 | 16-16961-09 | 23.0 ppb |
2016-05-09 | 16-16961-10 | 22.8 ppb |
2016-05-09 | 16-16961-11 | 29.8 ppb |
2016-05-09 | 16-16961-12 | 31.1 ppb |
2016-08-09 | 16-23088-01 | 20.2 ppb |
2016-08-09 | 16-23088-02 | 41.6 ppb |
2016-08-09 | 16-23088-03 | 17.1 ppb |
2016-08-09 | 16-23088-04 | 27.9 ppb |
2016-08-09 | 16-23088-05 | 17.6 ppb |
2016-08-09 | 16-23088-06 | 14.9 ppb |
2016-08-09 | 16-23088-07 | 15.9 ppb |
2016-08-09 | 16-23088-08 | 18.4 ppb |
2016-08-09 | 16-23088-09 | 20.1 ppb |
2016-08-09 | 16-23088-10 | 17.9 ppb |
2016-08-09 | 16-23088-11 | 17.5 ppb |
2016-08-09 | 16-23088-12 | 32.7 ppb |
2016-11-08 | 16-29217-01 | 13.0 ppb |
2016-11-08 | 16-29217-02 | 31.2 ppb |
2016-11-08 | 16-29217-03 | 12.7 ppb |
2016-11-08 | 16-29217-04 | 19.8 ppb |
2016-11-08 | 16-29217-05 | 10.8 ppb |
2016-11-08 | 16-29217-06 | 6.80 ppb |
2016-11-08 | 16-29217-07 | 5.00 ppb |
2016-11-08 | 16-29217-08 | 9.30 ppb |
2016-11-08 | 16-29217-09 | 11.3 ppb |
2016-11-08 | 16-29217-10 | 9.50 ppb |
2016-11-08 | 16-29217-11 | 6.30 ppb |
2016-11-08 | 16-29217-12 | 24.3 ppb |
2017-02-09 | 17-12533-01 | 14.3 ppb |
2017-02-09 | 17-12533-02 | 42.9 ppb |
2017-02-09 | 17-12533-03 | 13.2 ppb |
2017-02-09 | 17-12533-04 | 28.2 ppb |
2017-02-09 | 17-12533-05 | 14.0 ppb |
2017-02-09 | 17-12533-06 | 13.7 ppb |
2017-02-09 | 17-12533-07 | 8.90 ppb |
2017-02-09 | 17-12533-08 | 13.7 ppb |
2017-02-09 | 17-12533-09 | 17.5 ppb |
2017-02-09 | 17-12533-10 | 17.9 ppb |
2017-02-09 | 17-12533-11 | 10.9 ppb |
2017-02-09 | 17-12533-12 | 44.6 ppb |
2017-05-08 | 17-18379-01 | 28.1 ppb |
2017-05-08 | 17-18379-02 | 39.5 ppb |
2017-05-08 | 17-18379-03 | 29.7 ppb |
2017-05-08 | 17-18379-04 | 38.6 ppb |
2017-05-08 | 17-18379-05 | 27.6 ppb |
2017-05-08 | 17-18379-06 | 37.6 ppb |
2017-05-08 | 17-18379-07 | 28.0 ppb |
2017-05-08 | 17-18379-08 | 27.0 ppb |
2017-05-08 | 17-18379-09 | 34.9 ppb |
2017-05-08 | 17-18379-10 | 29.3 ppb |
2017-05-08 | 17-18379-11 | 25.4 ppb |
2017-05-08 | 17-18379-12 | 40.3 ppb |
2017-08-10 | 17-25344-01 | 13.4 ppb |
2017-08-10 | 17-25344-02 | 48.5 ppb |
2017-08-10 | 17-25344-03 | 9.70 ppb |
2017-08-10 | 17-25344-04 | 24.6 ppb |
2017-08-10 | 17-25344-05 | 13.6 ppb |
2017-08-10 | 17-25344-06 | 15.3 ppb |
2017-08-10 | 17-25344-07 | 8.40 ppb |
2017-08-10 | 17-25344-08 | 11.4 ppb |
2017-08-10 | 17-25344-09 | 19.6 ppb |
2017-08-10 | 17-25344-10 | 14.5 ppb |
2017-08-10 | 17-25344-11 | 11.5 ppb |
2017-08-10 | 17-25344-12 | 28.6 ppb |
2017-11-08 | 17-31893-01 | 12.5 ppb |
2017-11-08 | 17-31893-02 | 28.0 ppb |
2017-11-08 | 17-31893-03 | 9.00 ppb |
2017-11-08 | 17-31893-04 | 20.2 ppb |
2017-11-08 | 17-31893-05 | 11.1 ppb |
2017-11-08 | 17-31893-06 | 14.6 ppb |
2017-11-08 | 17-31893-07 | 11.2 ppb |
2017-11-08 | 17-31893-08 | 11.9 ppb |
2017-11-08 | 17-31893-09 | 15.4 ppb |
2017-11-08 | 17-31893-10 | 14.9 ppb |
2017-11-08 | 17-31893-11 | 11.7 ppb |
2017-11-08 | 17-31893-12 | 20.6 ppb |
2018-02-08 | M18-12473-01 | 7.70 ppb |
2018-02-08 | M18-12473-02 | 26.2 ppb |
2018-02-08 | M18-12473-03 | 8.20 ppb |
2018-02-08 | M18-12473-04 | 23.8 ppb |
2018-02-08 | M18-12473-05 | 6.90 ppb |
2018-02-08 | M18-12473-06 | 7.60 ppb |
2018-02-08 | M18-12473-07 | 5.00 ppb |
2018-02-08 | M18-12473-08 | 13.5 ppb |
2018-02-08 | M18-12473-09 | 10.8 ppb |
2018-02-08 | M18-12473-10 | 8.60 ppb |
2018-02-08 | M18-12473-11 | 5.60 ppb |
2018-02-08 | M18-12473-12 | 22.8 ppb |
2018-05-08 | 18-19022-01 | 19.8 ppb |
2018-05-08 | 18-19022-02 | 42.1 ppb |
2018-05-08 | 18-19022-03 | 18.4 ppb |
2018-05-08 | 18-19022-04 | 42.4 ppb |
2018-05-08 | 18-19022-05 | 20.0 ppb |
2018-05-08 | 18-19022-06 | 16.5 ppb |
2018-05-08 | 18-19022-07 | 15.8 ppb |
2018-05-08 | 18-19022-08 | 17.3 ppb |
2018-05-08 | 18-19022-09 | 22.5 ppb |
2018-05-08 | 18-19022-10 | 22.8 ppb |
2018-05-08 | 18-19022-11 | 16.4 ppb |
2018-05-08 | 18-19022-12 | 39.2 ppb |
2018-08-08 | 18-27007-01 | 28.6 ppb |
2018-08-08 | 18-27007-02 | 40.9 ppb |
2018-08-08 | 18-27007-03 | 23.8 ppb |
2018-08-08 | 18-27007-04 | 41.2 ppb |
2018-08-08 | 18-27007-05 | 24.4 ppb |
2018-08-08 | 18-27007-06 | 18.7 ppb |
2018-08-08 | 18-27007-07 | 21.2 ppb |
2018-08-08 | 18-27007-09 | 30.3 ppb |
2018-08-08 | 18-27007-10 | 29.9 ppb |
2018-08-08 | 18-27007-11 | 23.4 ppb |
2018-08-08 | 18-27007-12 | 33.6 ppb |
2018-08-14 | 18-27049-01 | 31.3 ppb |
2018-11-08 | 18-34685-01 | 6.00 ppb |
2018-11-08 | 18-34685-02 | 25.0 ppb |
2018-11-08 | 18-34685-03 | 6.60 ppb |
2018-11-08 | 18-34685-04 | 19.7 ppb |
2018-11-08 | 18-34685-05 | 4.40 ppb |
2018-11-08 | 18-34685-06 | 5.50 ppb |
2018-11-08 | 18-34685-07 | 5.10 ppb |
2018-11-08 | 18-34685-08 | 5.00 ppb |
2018-11-08 | 18-34685-09 | 8.30 ppb |
2018-11-08 | 18-34685-10 | 8.10 ppb |
2018-11-08 | 18-34685-11 | 4.50 ppb |
2018-11-08 | 18-34685-12 | 21.7 ppb |
2019-02-11 | 19-12916-01 | 11.7 ppb |
2019-02-11 | 19-12916-02 | 36.1 ppb |
2019-02-11 | 19-12916-03 | 13.0 ppb |
2019-02-11 | 19-12916-04 | 25.9 ppb |
2019-02-11 | 19-12916-05 | 15.3 ppb |
2019-02-11 | 19-12916-06 | 17.8 ppb |
2019-02-11 | 19-12916-07 | 18.8 ppb |
2019-02-11 | 19-12916-08 | 12.6 ppb |
2019-02-11 | 19-12916-09 | 43.0 ppb |
2019-02-11 | 19-12916-10 | 14.4 ppb |
2019-02-11 | 19-12916-11 | 11.7 ppb |
2019-02-11 | 19-12916-12 | 29.9 ppb |
2019-05-09 | 19-19523-01 | 17.4 ppb |
2019-05-09 | 19-19523-02 | 35.0 ppb |
2019-05-09 | 19-19523-03 | 22.0 ppb |
2019-05-09 | 19-19523-04 | 35.2 ppb |
2019-05-09 | 19-19523-05 | 23.8 ppb |
2019-05-09 | 19-19523-06 | 41.0 ppb |
2019-05-09 | 19-19523-07 | 39.3 ppb |
2019-05-09 | 19-19523-08 | 20.6 ppb |
2019-05-09 | 19-19523-09 | 17.6 ppb |
2019-05-09 | 19-19523-10 | 16.9 ppb |
2019-05-09 | 19-19523-11 | 25.0 ppb |
2019-05-09 | 19-19523-12 | 43.5 ppb |
2019-08-12 | 19-27948-01 | 69.9 ppb |
2019-08-12 | 19-27948-02 | 77.7 ppb |
2019-08-12 | 19-27948-03 | 79.3 ppb |
2019-08-12 | 19-27948-04 | 73.9 ppb |
2019-08-12 | 19-27948-05 | 77.0 ppb |
2019-08-12 | 19-27948-06 | 66.4 ppb |
2019-08-12 | 19-27948-07 | 75.0 ppb |
2019-08-12 | 19-27948-08 | 77.4 ppb |
2019-08-12 | 19-27948-09 | 65.1 ppb |
2019-08-12 | 19-27948-10 | 69.8 ppb |
2019-08-12 | 19-27948-11 | 79.3 ppb |
2019-08-12 | 19-27948-12 | 75.6 ppb |