Chloroform
City of Raleigh
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 | 17.7 ppb | 48 | 48 | 8.10 ppb - 39.0 ppb |
2015 | 16.2 ppb | 49 | 49 | 5.70 ppb - 31.0 ppb |
2016 | 23.0 ppb | 48 | 48 | 12.1 ppb - 64.7 ppb |
2017 | 23.3 ppb | 60 | 60 | 1.70 ppb - 44.9 ppb |
2018 | 19.6 ppb | 48 | 48 | 4.40 ppb - 57.7 ppb |
2019 | 20.8 ppb | 48 | 48 | 5.08 ppb - 52.8 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 |
---|---|---|
2014-02-25 | 3760420140304033 | 16.3 ppb |
2014-02-25 | 3760420140304033 | 10.2 ppb |
2014-02-25 | 3760420140304033 | 10.1 ppb |
2014-02-25 | 3760420140304033 | 9.70 ppb |
2014-02-25 | 3760420140304033 | 9.30 ppb |
2014-02-25 | 3760420140304033 | 9.30 ppb |
2014-02-25 | 3760420140304033 | 9.60 ppb |
2014-02-25 | 3760420140304033 | 14.9 ppb |
2014-02-25 | 3760420140304033 | 9.80 ppb |
2014-02-25 | 3760420140304033 | 14.9 ppb |
2014-02-25 | 3760420140304033 | 16.3 ppb |
2014-02-25 | 3760420140304033 | 8.70 ppb |
2014-05-02 | 3760420140512100 | 17.0 ppb |
2014-05-02 | 3760420140512100 | 13.2 ppb |
2014-05-02 | 3760420140512100 | 12.6 ppb |
2014-05-02 | 3760420140512100 | 13.1 ppb |
2014-05-02 | 3760420140512100 | 21.3 ppb |
2014-05-02 | 3760420140512100 | 21.1 ppb |
2014-05-02 | 3760420140512100 | 19.2 ppb |
2014-05-02 | 3760420140512100 | 28.0 ppb |
2014-05-02 | 3760420140512100 | 28.2 ppb |
2014-05-02 | 3760420140512100 | 15.8 ppb |
2014-05-02 | 3760420140512100 | 15.7 ppb |
2014-05-02 | 3760420140512100 | 21.6 ppb |
2014-08-07 | 3077948 | 33.0 ppb |
2014-08-07 | 3077949 | 35.0 ppb |
2014-08-07 | 3077950 | 15.0 ppb |
2014-08-07 | 3077951 | 8.20 ppb |
2014-08-07 | 3077952 | 8.10 ppb |
2014-08-07 | 3077953 | 9.50 ppb |
2014-08-07 | 3077954 | 10.00 ppb |
2014-08-07 | 3077955 | 12.0 ppb |
2014-08-07 | 3077956 | 26.0 ppb |
2014-08-07 | 3077957 | 28.0 ppb |
2014-08-07 | 3077958 | 23.0 ppb |
2014-08-07 | 3077959 | 39.0 ppb |
2014-11-06 | 3760420141205005 | 31.0 ppb |
2014-11-06 | 3760420141205005 | 28.5 ppb |
2014-11-06 | 3760420141205005 | 12.3 ppb |
2014-11-06 | 3760420141205005 | 23.2 ppb |
2014-11-06 | 3760420141205005 | 12.2 ppb |
2014-11-06 | 3760420141205005 | 20.7 ppb |
2014-11-06 | 3760420141205005 | 19.5 ppb |
2014-11-06 | 3760420141205005 | 16.8 ppb |
2014-11-06 | 3760420141205005 | 17.6 ppb |
2014-11-06 | 3760420141205005 | 11.8 ppb |
2014-11-06 | 3760420141205005 | 33.6 ppb |
2014-11-06 | 3760420141205005 | 11.7 ppb |
2015-02-05 | 5.70 ppb | |
2015-02-05 | 20.4 ppb | |
2015-02-05 | 16.3 ppb | |
2015-02-05 | 6.84 ppb | |
2015-02-05 | 10.6 ppb | |
2015-02-05 | 7.14 ppb | |
2015-02-05 | 11.2 ppb | |
2015-02-05 | 8.95 ppb | |
2015-02-05 | 9.44 ppb | |
2015-02-05 | 10.6 ppb | |
2015-02-05 | 7.40 ppb | |
2015-02-05 | 21.6 ppb | |
2015-02-05 | 7.42 ppb | |
2015-05-07 | 24.4 ppb | |
2015-05-07 | 26.5 ppb | |
2015-05-07 | 18.0 ppb | |
2015-05-07 | 18.2 ppb | |
2015-05-07 | 19.6 ppb | |
2015-05-07 | 12.3 ppb | |
2015-05-07 | 18.1 ppb | |
2015-05-07 | 21.3 ppb | |
2015-05-07 | 12.1 ppb | |
2015-05-07 | 12.0 ppb | |
2015-05-07 | 22.9 ppb | |
2015-05-07 | 12.3 ppb | |
2015-08-06 | 9.80 ppb | |
2015-08-06 | 9.40 ppb | |
2015-08-06 | 9.70 ppb | |
2015-08-06 | 13.0 ppb | |
2015-08-06 | 15.0 ppb | |
2015-08-06 | 12.0 ppb | |
2015-08-06 | 27.0 ppb | |
2015-08-06 | 22.0 ppb | |
2015-08-06 | 24.0 ppb | |
2015-08-06 | 22.0 ppb | |
2015-08-06 | 31.0 ppb | |
2015-08-06 | 26.0 ppb | |
2015-11-05 | 14.0 ppb | |
2015-11-05 | 24.0 ppb | |
2015-11-05 | 13.0 ppb | |
2015-11-05 | 14.0 ppb | |
2015-11-05 | 19.0 ppb | |
2015-11-05 | 17.0 ppb | |
2015-11-05 | 13.0 ppb | |
2015-11-05 | 17.0 ppb | |
2015-11-05 | 15.0 ppb | |
2015-11-05 | 16.0 ppb | |
2015-11-05 | 28.0 ppb | |
2015-11-05 | 24.0 ppb | |
2016-02-04 | 8048-020416-B01M | 14.0 ppb |
2016-02-04 | 8048-020416-B02M | 20.0 ppb |
2016-02-04 | 8048-020416-B03M | 15.0 ppb |
2016-02-04 | 8048-020416-B04M | 14.0 ppb |
2016-02-04 | 8048-020416-B05M | 15.0 ppb |
2016-02-04 | 8048-020416-B06M | 16.0 ppb |
2016-02-04 | 8048-020416-B07M | 14.0 ppb |
2016-02-04 | 8048-020416-B08M | 14.0 ppb |
2016-02-04 | 8048-020416-B09M | 14.0 ppb |
2016-02-04 | 8048-020416-B10M | 13.0 ppb |
2016-02-04 | 8048-020416-B11M | 22.0 ppb |
2016-02-04 | 8048-020416-B12M | 18.0 ppb |
2016-05-12 | 8048-051216-B01M | 20.0 ppb |
2016-05-12 | 8048-051216-B02M | 33.0 ppb |
2016-05-12 | 8048-051216-B03M | 17.0 ppb |
2016-05-12 | 8048-051216-B04M | 18.0 ppb |
2016-05-12 | 8048-051216-B05M | 14.0 ppb |
2016-05-12 | 8048-051216-B06M | 21.0 ppb |
2016-05-12 | 8048-051216-B07M | 18.0 ppb |
2016-05-12 | 8048-051216-B08M | 24.0 ppb |
2016-05-12 | 8048-051216-B09M | 16.0 ppb |
2016-05-12 | 8048-051216-B10M | 20.0 ppb |
2016-05-12 | 8048-051216-B11M | 36.0 ppb |
2016-05-12 | 8048-051216-B12M | 35.0 ppb |
2016-08-29 | 3760420160830011 | 13.4 ppb |
2016-08-29 | 3760420160830011 | 59.5 ppb |
2016-08-29 | 3760420160830011 | 59.1 ppb |
2016-08-29 | 3760420160830011 | 15.4 ppb |
2016-08-29 | 3760420160830011 | 45.3 ppb |
2016-08-29 | 3760420160830011 | 13.1 ppb |
2016-08-29 | 3760420160830011 | 46.2 ppb |
2016-08-29 | 3760420160830011 | 54.3 ppb |
2016-08-29 | 3760420160830011 | 14.4 ppb |
2016-08-29 | 3760420160830011 | 16.0 ppb |
2016-08-29 | 3760420160830011 | 12.1 ppb |
2016-08-29 | 3760420160830011 | 64.7 ppb |
2016-11-22 | 8048-112216-B01M | 12.5 ppb |
2016-11-22 | 8048-112216-B02M | 25.5 ppb |
2016-11-22 | 8048-112216-B03M | 13.6 ppb |
2016-11-22 | 8048-112216-B04M | 12.8 ppb |
2016-11-22 | 8048-112216-B05M | 19.3 ppb |
2016-11-22 | 8048-112216-B06M | 17.1 ppb |
2016-11-22 | 8048-112216-B07M | 13.1 ppb |
2016-11-22 | 8048-112216-B08M | 19.6 ppb |
2016-11-22 | 8048-112216-B09M | 18.1 ppb |
2016-11-22 | 8048-112216-B10M | 14.8 ppb |
2016-11-22 | 8048-112216-B11M | 31.7 ppb |
2016-11-22 | 8048-112216-B12M | 33.1 ppb |
2017-02-02 | 3760420170202013 | 14.3 ppb |
2017-02-02 | 3760420170202013 | 14.9 ppb |
2017-02-02 | 3760420170202013 | 8.60 ppb |
2017-02-02 | 3760420170202013 | 9.70 ppb |
2017-02-02 | 3760420170202013 | 8.10 ppb |
2017-02-02 | 3760420170202013 | 9.70 ppb |
2017-02-02 | 3760420170202013 | 8.60 ppb |
2017-02-02 | 3760420170202013 | 9.50 ppb |
2017-02-02 | 3760420170202013 | 11.8 ppb |
2017-02-02 | 3760420170202013 | 8.40 ppb |
2017-02-02 | 3760420170202013 | 17.3 ppb |
2017-02-02 | 3760420170202013 | 1.70 ppb |
2017-05-05 | 3760420170504011 | 23.1 ppb |
2017-05-05 | 3760420170504011 | 19.9 ppb |
2017-05-05 | 3760420170504011 | 18.9 ppb |
2017-05-05 | 3760420170504011 | 23.3 ppb |
2017-05-05 | 3760420170504011 | 17.3 ppb |
2017-05-05 | 3760420170504011 | 17.5 ppb |
2017-05-05 | 3760420170504011 | 29.4 ppb |
2017-05-05 | 3760420170504011 | 31.1 ppb |
2017-05-05 | 3760420170504011 | 21.3 ppb |
2017-05-05 | 3760420170504011 | 25.3 ppb |
2017-05-05 | 3760420170504011 | 25.8 ppb |
2017-05-05 | 3760420170504011 | 26.0 ppb |
2017-08-24 | 3760420170825007 | 37.8 ppb |
2017-08-24 | 3760420170825007 | 40.4 ppb |
2017-08-24 | 3760420170825007 | 19.3 ppb |
2017-08-24 | 3760420170825007 | 38.5 ppb |
2017-08-24 | 3760420170825007 | 16.5 ppb |
2017-08-24 | 3760420170825007 | 34.6 ppb |
2017-08-24 | 3760420170825007 | 31.0 ppb |
2017-08-24 | 3760420170825007 | 22.5 ppb |
2017-08-24 | 3760420170825007 | 14.6 ppb |
2017-08-24 | 3760420170825007 | 15.1 ppb |
2017-08-24 | 3760420170825007 | 41.6 ppb |
2017-08-24 | 3760420170825007 | 17.2 ppb |
2017-08-24 | 8048-082417-B01M | 21.9 ppb |
2017-08-24 | 8048-082417-B02M | 42.4 ppb |
2017-08-24 | 8048-082417-B03M | 20.3 ppb |
2017-08-24 | 8048-082417-B04M | 18.4 ppb |
2017-08-24 | 8048-082417-B05M | 17.7 ppb |
2017-08-24 | 8048-082417-B06M | 41.6 ppb |
2017-08-24 | 8048-082417-B07M | 17.6 ppb |
2017-08-24 | 8048-082417-B08M | 42.9 ppb |
2017-08-24 | 8048-082417-B09M | 24.9 ppb |
2017-08-24 | 8048-082417-B10M | 31.1 ppb |
2017-08-24 | 8048-082417-B11M | 44.9 ppb |
2017-08-24 | 8048-082417-B12M | 43.1 ppb |
2017-11-02 | 3760420171102013 | 25.3 ppb |
2017-11-02 | 3760420171102013 | 24.8 ppb |
2017-11-02 | 3760420171102013 | 14.5 ppb |
2017-11-02 | 3760420171102013 | 9.00 ppb |
2017-11-02 | 3760420171102013 | 41.4 ppb |
2017-11-02 | 3760420171102013 | 11.4 ppb |
2017-11-02 | 3760420171102013 | 41.1 ppb |
2017-11-02 | 3760420171102013 | 38.6 ppb |
2017-11-02 | 3760420171102013 | 10.9 ppb |
2017-11-02 | 3760420171102013 | 40.0 ppb |
2017-11-02 | 3760420171102013 | 10.6 ppb |
2017-11-02 | 3760420171102013 | 32.1 ppb |
2018-02-01 | 3760420180201020 | 10.5 ppb |
2018-02-01 | 3760420180201020 | 9.50 ppb |
2018-02-01 | 3760420180201020 | 8.50 ppb |
2018-02-01 | 3760420180201020 | 9.10 ppb |
2018-02-01 | 3760420180201020 | 9.30 ppb |
2018-02-01 | 3760420180201020 | 8.10 ppb |
2018-02-01 | 3760420180201020 | 7.40 ppb |
2018-02-01 | 3760420180201020 | 9.70 ppb |
2018-02-01 | 3760420180201020 | 9.00 ppb |
2018-02-01 | 3760420180201020 | 7.30 ppb |
2018-02-01 | 3760420180201020 | 8.80 ppb |
2018-02-01 | 3760420180201020 | 4.40 ppb |
2018-05-03 | 3760420180503013 | 17.5 ppb |
2018-05-03 | 3760420180503013 | 20.4 ppb |
2018-05-03 | 3760420180503013 | 13.0 ppb |
2018-05-03 | 3760420180503013 | 15.2 ppb |
2018-05-03 | 3760420180503013 | 13.9 ppb |
2018-05-03 | 3760420180503013 | 22.0 ppb |
2018-05-03 | 3760420180503013 | 19.3 ppb |
2018-05-03 | 3760420180503013 | 12.5 ppb |
2018-05-03 | 3760420180503013 | 11.0 ppb |
2018-05-03 | 3760420180503013 | 13.1 ppb |
2018-05-03 | 3760420180503013 | 24.5 ppb |
2018-05-03 | 3760420180503013 | 13.4 ppb |
2018-08-27 | 3760420180827040 | 57.7 ppb |
2018-08-27 | 3760420180827040 | 37.6 ppb |
2018-08-27 | 3760420180827040 | 33.4 ppb |
2018-08-27 | 3760420180827040 | 32.9 ppb |
2018-08-27 | 3760420180827040 | 28.0 ppb |
2018-08-27 | 3760420180827040 | 40.4 ppb |
2018-08-27 | 3760420180827040 | 45.3 ppb |
2018-08-27 | 3760420180827040 | 33.7 ppb |
2018-08-27 | 3760420180827040 | 27.9 ppb |
2018-08-27 | 3760420180827040 | 22.4 ppb |
2018-08-27 | 3760420180827040 | 56.3 ppb |
2018-08-27 | 3760420180827040 | 28.0 ppb |
2018-11-19 | 3760420181119062 | 24.8 ppb |
2018-11-19 | 3760420181119062 | 19.5 ppb |
2018-11-19 | 3760420181119062 | 15.2 ppb |
2018-11-19 | 3760420181119062 | 13.0 ppb |
2018-11-19 | 3760420181119062 | 15.8 ppb |
2018-11-19 | 3760420181119062 | 12.3 ppb |
2018-11-19 | 3760420181119062 | 11.7 ppb |
2018-11-19 | 3760420181119062 | 16.0 ppb |
2018-11-19 | 3760420181119062 | 17.6 ppb |
2018-11-19 | 3760420181119062 | 14.9 ppb |
2018-11-19 | 3760420181119062 | 20.8 ppb |
2018-11-19 | 3760420181119062 | 16.3 ppb |
2019-02-19 | 3760420190221033 | 28.7 ppb |
2019-02-19 | 3760420190221033 | 5.65 ppb |
2019-02-19 | 3760420190221033 | 20.2 ppb |
2019-02-19 | 3760420190221033 | 5.55 ppb |
2019-02-19 | 3760420190221033 | 18.0 ppb |
2019-02-19 | 3760420190221033 | 11.2 ppb |
2019-02-19 | 3760420190221033 | 11.7 ppb |
2019-02-19 | 3760420190221033 | 5.08 ppb |
2019-02-19 | 3760420190221033 | 29.0 ppb |
2019-02-19 | 3760420190221033 | 6.62 ppb |
2019-02-19 | 3760420190307022 | 31.5 ppb |
2019-02-19 | 3760420190307022 | 20.9 ppb |
2019-05-02 | 3760420190502013 | 28.9 ppb |
2019-05-02 | 3760420190502013 | 25.1 ppb |
2019-05-02 | 3760420190502013 | 18.9 ppb |
2019-05-02 | 3760420190502013 | 17.8 ppb |
2019-05-02 | 3760420190502013 | 19.6 ppb |
2019-05-02 | 3760420190502013 | 16.5 ppb |
2019-05-02 | 3760420190502013 | 16.3 ppb |
2019-05-02 | 3760420190502013 | 19.3 ppb |
2019-05-02 | 3760420190502013 | 20.6 ppb |
2019-05-02 | 3760420190502013 | 18.5 ppb |
2019-05-02 | 3760420190502013 | 25.8 ppb |
2019-05-02 | 3760420190502013 | 16.5 ppb |
2019-08-01 | 2019080101507A | 32.2 ppb |
2019-08-01 | 2019080101513A | 46.9 ppb |
2019-08-01 | 2019080101514A | 49.6 ppb |
2019-08-01 | 2019080101515C | 19.2 ppb |
2019-08-01 | 2019080101516A | 17.1 ppb |
2019-08-01 | 2019080101517A | 18.4 ppb |
2019-08-01 | 2019080101518A | 35.4 ppb |
2019-08-01 | 2019080101520C | 24.5 ppb |
2019-08-01 | 2019080101521A | 19.1 ppb |
2019-08-01 | 2019080101522C | 15.7 ppb |
2019-08-01 | 2019080101523A | 52.8 ppb |
2019-08-01 | 2019080101524A | 17.6 ppb |
2019-11-07 | 3760420191107013 | 26.2 ppb |
2019-11-07 | 3760420191107013 | 27.0 ppb |
2019-11-07 | 3760420191107013 | 9.92 ppb |
2019-11-07 | 3760420191107013 | 24.0 ppb |
2019-11-07 | 3760420191107013 | 10.7 ppb |
2019-11-07 | 3760420191107013 | 18.8 ppb |
2019-11-07 | 3760420191107013 | 15.9 ppb |
2019-11-07 | 3760420191107013 | 15.6 ppb |
2019-11-07 | 3760420191107013 | 17.0 ppb |
2019-11-07 | 3760420191107013 | 11.0 ppb |
2019-11-07 | 3760420191107013 | 26.3 ppb |
2019-11-07 | 3760420191107013 | 10.0 ppb |