Chloroform
Pittsburgh Water & Sewer Authority
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 |
---|---|---|---|---|
2014 | 25.3 ppb | 48 | 48 | 5.60 ppb - 66.2 ppb |
2015 | 24.9 ppb | 51 | 51 | 4.47 ppb - 59.6 ppb |
2016 | 21.4 ppb | 48 | 48 | 3.40 ppb - 50.5 ppb |
2017 | 29.2 ppb | 48 | 48 | 5.30 ppb - 56.0 ppb |
2018 | 27.2 ppb | 48 | 48 | 7.00 ppb - 69.2 ppb |
2019 | 33.7 ppb | 48 | 48 | 8.12 ppb - 83.8 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 |
---|---|---|
2014-02-03 | 1071415005 | 8.40 ppb |
2014-02-03 | 1071415012 | 8.00 ppb |
2014-02-03 | 1071415001 | 7.40 ppb |
2014-02-03 | 1071415006 | 7.40 ppb |
2014-02-03 | 1071415008 | 10.5 ppb |
2014-02-03 | 1071415003 | 7.00 ppb |
2014-02-03 | 1071415004 | 5.60 ppb |
2014-02-03 | 1071415010 | 10.1 ppb |
2014-02-03 | 1071415002 | 7.80 ppb |
2014-02-03 | 1071415009 | 17.9 ppb |
2014-02-03 | 1071415007 | 9.70 ppb |
2014-02-03 | 1071415011 | 11.4 ppb |
2014-05-12 | 2006707007 | 35.3 ppb |
2014-05-12 | 2006707002 | 30.6 ppb |
2014-05-12 | 2006707009 | 20.8 ppb |
2014-05-12 | 2006707012 | 28.0 ppb |
2014-05-12 | 2006707005 | 29.9 ppb |
2014-05-12 | 2006707006 | 13.3 ppb |
2014-05-12 | 2006707004 | 33.0 ppb |
2014-05-12 | 2006707001 | 16.9 ppb |
2014-05-12 | 2006707011 | 22.5 ppb |
2014-05-12 | 2006707008 | 26.3 ppb |
2014-05-12 | 2006707003 | 34.1 ppb |
2014-05-12 | 2006707010 | 34.4 ppb |
2014-08-01 | 2021780002 | 36.4 ppb |
2014-08-01 | 2021780009 | 66.2 ppb |
2014-08-01 | 2021780012 | 27.1 ppb |
2014-08-01 | 2021780005 | 53.4 ppb |
2014-08-01 | 2021780006 | 23.5 ppb |
2014-08-01 | 2021780004 | 45.5 ppb |
2014-08-01 | 2021780001 | 44.4 ppb |
2014-08-01 | 2021780011 | 46.0 ppb |
2014-08-01 | 2021780003 | 42.9 ppb |
2014-08-01 | 2021780010 | 45.6 ppb |
2014-08-18 | 2024501001 | 59.4 ppb |
2014-08-18 | 2024501002 | 39.0 ppb |
2014-11-03 | 11140081 | 23.0 ppb |
2014-11-03 | 11140072 | 14.0 ppb |
2014-11-03 | 11140079 | 22.0 ppb |
2014-11-03 | 11140075 | 20.0 ppb |
2014-11-03 | 11140078 | 21.0 ppb |
2014-11-03 | 11140071 | 11.0 ppb |
2014-11-03 | 11140080 | 13.0 ppb |
2014-11-03 | 11140076 | 31.0 ppb |
2014-11-03 | 11140077 | 18.0 ppb |
2014-11-03 | 11140074 | 24.0 ppb |
2014-11-03 | 11140073 | 28.0 ppb |
2014-11-04 | 11140263 | 22.0 ppb |
2015-01-29 | 12344321 | 6.09 ppb |
2015-01-29 | 12344271 | 5.73 ppb |
2015-01-29 | 12344311 | 5.70 ppb |
2015-01-29 | 12344281 | 5.14 ppb |
2015-01-29 | 12344306 | 6.34 ppb |
2015-01-29 | 12344266 | 4.47 ppb |
2015-01-29 | 12344291 | 5.52 ppb |
2015-01-29 | 12344316 | 6.08 ppb |
2015-01-29 | 12344286 | 10.8 ppb |
2015-01-29 | 12344301 | 6.09 ppb |
2015-01-29 | 12344296 | 4.91 ppb |
2015-01-29 | 12344276 | 27.8 ppb |
2015-03-09 | 12572661 | 6.00 ppb |
2015-03-11 | 12572659 | 5.00 ppb |
2015-03-12 | 12572660 | 6.00 ppb |
2015-04-29 | 12691779 | 27.0 ppb |
2015-04-29 | 12691785 | 18.0 ppb |
2015-04-29 | 12691791 | 24.0 ppb |
2015-04-29 | 12691797 | 18.0 ppb |
2015-04-29 | 12691803 | 22.0 ppb |
2015-04-29 | 12691809 | 11.0 ppb |
2015-04-29 | 12691821 | 13.0 ppb |
2015-04-29 | 12691827 | 25.0 ppb |
2015-04-29 | 12691833 | 12.0 ppb |
2015-04-29 | 12691839 | 20.0 ppb |
2015-04-29 | 12691845 | 22.0 ppb |
2015-04-30 | 12691815 | 24.0 ppb |
2015-07-29 | 13074845 | 57.5 ppb |
2015-07-29 | 13074855 | 38.9 ppb |
2015-07-29 | 13074875 | 34.3 ppb |
2015-07-29 | 13074880 | 45.3 ppb |
2015-07-29 | 13074870 | 55.5 ppb |
2015-07-29 | 13074840 | 29.3 ppb |
2015-07-29 | 13074850 | 37.3 ppb |
2015-07-29 | 13074885 | 51.5 ppb |
2015-07-29 | 13074865 | 48.1 ppb |
2015-07-29 | 13074860 | 48.3 ppb |
2015-07-29 | 13074890 | 51.2 ppb |
2015-07-30 | 13197731 | 59.6 ppb |
2015-11-02 | 13572997 | 37.8 ppb |
2015-11-02 | 13573037 | 31.5 ppb |
2015-11-02 | 13573014 | 27.6 ppb |
2015-11-02 | 13573020 | 18.2 ppb |
2015-11-02 | 13572991 | 15.7 ppb |
2015-11-02 | 13573031 | 38.2 ppb |
2015-11-03 | 13573026 | 46.8 ppb |
2015-11-03 | 13573055 | 28.1 ppb |
2015-11-03 | 13573008 | 27.6 ppb |
2015-11-03 | 13573049 | 42.2 ppb |
2015-11-03 | 13573003 | 25.0 ppb |
2015-11-03 | 13573043 | 28.2 ppb |
2016-02-01 | 13812288 | 6.00 ppb |
2016-02-01 | 13812228 | 4.90 ppb |
2016-02-01 | 13812246 | 6.50 ppb |
2016-02-01 | 13812252 | 4.40 ppb |
2016-02-01 | 13812282 | 3.90 ppb |
2016-02-01 | 13812258 | 3.40 ppb |
2016-02-01 | 13812240 | 8.30 ppb |
2016-02-01 | 13812294 | 4.30 ppb |
2016-02-01 | 13812234 | 5.70 ppb |
2016-02-02 | 13812264 | 5.90 ppb |
2016-02-02 | 13812276 | 5.90 ppb |
2016-02-02 | 13812270 | 5.60 ppb |
2016-05-02 | 14327820 | 20.0 ppb |
2016-05-02 | 14327844 | 26.8 ppb |
2016-05-02 | 14327874 | 18.5 ppb |
2016-05-02 | 14327856 | 21.6 ppb |
2016-05-02 | 14327862 | 16.8 ppb |
2016-05-02 | 14327868 | 10.3 ppb |
2016-05-02 | 14327880 | 24.0 ppb |
2016-05-02 | 14327832 | 11.8 ppb |
2016-05-02 | 14327850 | 24.0 ppb |
2016-05-02 | 14327826 | 24.6 ppb |
2016-05-02 | 14387824 | 19.0 ppb |
2016-05-02 | 14327838 | 18.5 ppb |
2016-08-01 | 14820946 | 38.7 ppb |
2016-08-01 | 14820982 | 21.2 ppb |
2016-08-01 | 14820952 | 17.0 ppb |
2016-08-01 | 14820964 | 22.5 ppb |
2016-08-01 | 14820994 | 25.2 ppb |
2016-08-01 | 14820970 | 15.1 ppb |
2016-08-01 | 14820940 | 21.9 ppb |
2016-08-01 | 14820958 | 17.6 ppb |
2016-08-01 | 14821006 | 30.4 ppb |
2016-08-01 | 14821000 | 23.2 ppb |
2016-08-01 | 14820988 | 19.2 ppb |
2016-08-01 | 14820976 | 20.3 ppb |
2016-10-31 | 15152897 | 46.3 ppb |
2016-10-31 | 15152861 | 34.1 ppb |
2016-10-31 | 15152885 | 32.4 ppb |
2016-10-31 | 15152879 | 35.0 ppb |
2016-10-31 | 15152909 | 41.2 ppb |
2016-10-31 | 15152867 | 23.0 ppb |
2016-10-31 | 15152915 | 39.3 ppb |
2016-10-31 | 15152921 | 50.5 ppb |
2016-10-31 | 15152873 | 48.2 ppb |
2016-10-31 | 15152891 | 31.8 ppb |
2016-10-31 | 15152903 | 34.4 ppb |
2016-11-01 | 15152855 | 37.3 ppb |
2017-02-03 | 15722378 | 12.4 ppb |
2017-02-03 | 15722420 | 10.00 ppb |
2017-02-03 | 15722426 | 11.2 ppb |
2017-02-03 | 15722390 | 13.7 ppb |
2017-02-03 | 15722370 | 14.1 ppb |
2017-02-03 | 15722408 | 10.9 ppb |
2017-02-03 | 15722396 | 5.30 ppb |
2017-02-03 | 15722402 | 15.0 ppb |
2017-02-03 | 15722414 | 10.2 ppb |
2017-02-03 | 15722366 | 13.1 ppb |
2017-02-03 | 15722384 | 11.5 ppb |
2017-02-15 | 15722359 | 6.10 ppb |
2017-05-02 | 16016204 | 36.0 ppb |
2017-05-02 | 16016197 | 28.0 ppb |
2017-05-02 | 16016194 | 35.0 ppb |
2017-05-02 | 16016202 | 42.0 ppb |
2017-05-02 | 16016201 | 19.0 ppb |
2017-05-02 | 16016200 | 38.0 ppb |
2017-05-02 | 16016203 | 25.0 ppb |
2017-05-02 | 16016193 | 42.0 ppb |
2017-05-02 | 16016196 | 36.0 ppb |
2017-05-02 | 16016199 | 34.0 ppb |
2017-05-02 | 16016198 | 35.0 ppb |
2017-05-03 | 16016195 | 36.0 ppb |
2017-08-01 | 16644482 | 47.0 ppb |
2017-08-01 | 16644458 | 56.0 ppb |
2017-08-01 | 16644494 | 36.0 ppb |
2017-08-01 | 16644511 | 51.0 ppb |
2017-08-01 | 16644446 | 47.0 ppb |
2017-08-01 | 16644476 | 30.0 ppb |
2017-08-01 | 16644470 | 45.0 ppb |
2017-08-01 | 16644452 | 34.0 ppb |
2017-08-01 | 16644506 | 54.0 ppb |
2017-08-01 | 16644488 | 56.0 ppb |
2017-08-01 | 16644464 | 40.0 ppb |
2017-08-01 | 16644500 | 43.0 ppb |
2017-11-01 | 17090626 | 38.0 ppb |
2017-11-01 | 17090644 | 23.0 ppb |
2017-11-01 | 17090650 | 18.0 ppb |
2017-11-01 | 17090656 | 27.0 ppb |
2017-11-01 | 17090662 | 23.0 ppb |
2017-11-01 | 17090668 | 28.0 ppb |
2017-11-02 | 17090632 | 30.0 ppb |
2017-11-02 | 17090638 | 27.0 ppb |
2017-11-02 | 17091654 | 38.0 ppb |
2017-11-02 | 17090674 | 38.0 ppb |
2017-11-02 | 17090680 | 19.0 ppb |
2017-11-02 | 17090686 | 16.0 ppb |
2018-02-02 | 02180209 | 17.0 ppb |
2018-02-02 | 02180205 | 14.0 ppb |
2018-02-02 | 02180211 | 15.0 ppb |
2018-02-02 | 02180214 | 12.0 ppb |
2018-02-02 | 02180203 | 11.0 ppb |
2018-02-02 | 02180208 | 7.00 ppb |
2018-02-02 | 02180207 | 11.0 ppb |
2018-02-02 | 02180204 | 10.00 ppb |
2018-02-02 | 02180213 | 17.0 ppb |
2018-02-02 | 02180210 | 12.0 ppb |
2018-02-02 | 02180206 | 10.00 ppb |
2018-02-02 | 02180212 | 14.0 ppb |
2018-05-01 | 18E0088-04 | 22.7 ppb |
2018-05-01 | 18E0088-02 | 19.8 ppb |
2018-05-01 | 18E0088-07 | 19.7 ppb |
2018-05-01 | 18E0088-03 | 8.26 ppb |
2018-05-01 | 18E0088-01 | 14.1 ppb |
2018-05-01 | 18E0088-06 | 22.8 ppb |
2018-05-01 | 18E0088-05 | 15.8 ppb |
2018-05-02 | 18E0264-05 | 20.5 ppb |
2018-05-02 | 18E0264-01 | 19.5 ppb |
2018-05-02 | 18E0264-03 | 20.5 ppb |
2018-05-02 | 18E0264-04 | 19.5 ppb |
2018-05-02 | 18E0264-02 | 15.6 ppb |
2018-08-01 | 18H0210-04 | 33.9 ppb |
2018-08-01 | 18H0210-02 | 69.2 ppb |
2018-08-01 | 18H0210-03 | 25.1 ppb |
2018-08-01 | 18H0210-01 | 31.9 ppb |
2018-08-01 | 18H0210-05 | 64.3 ppb |
2018-08-01 | 18H0210-06 | 46.7 ppb |
2018-08-02 | 18H0572-04 | 47.0 ppb |
2018-08-02 | 18H0572-06 | 51.1 ppb |
2018-08-02 | 18H0572-01 | 53.3 ppb |
2018-08-02 | 18H0572-03 | 58.1 ppb |
2018-08-02 | 18H0572-05 | 59.7 ppb |
2018-08-02 | 18H0572-02 | 45.7 ppb |
2018-11-01 | 18K0426-04 | 17.2 ppb |
2018-11-01 | 18K0426-06 | 27.9 ppb |
2018-11-01 | 18K0426-03 | 16.3 ppb |
2018-11-01 | 18K0426-01 | 17.5 ppb |
2018-11-01 | 18K0426-02 | 29.9 ppb |
2018-11-01 | 18K0426-05 | 30.1 ppb |
2018-11-02 | 18K0627-02 | 36.9 ppb |
2018-11-02 | 18K0627-05 | 27.9 ppb |
2018-11-02 | 18K0627-01 | 33.7 ppb |
2018-11-02 | 18K0627-03 | 34.9 ppb |
2018-11-02 | 18K0627-06 | 43.9 ppb |
2018-11-02 | 18K0627-04 | 33.5 ppb |
2019-02-01 | 19B0579-01 | 12.1 ppb |
2019-02-01 | 19B0579-02 | 11.6 ppb |
2019-02-01 | 19B0579-03 | 10.3 ppb |
2019-02-01 | 19B0579-04 | 12.0 ppb |
2019-02-01 | 19B0579-05 | 9.90 ppb |
2019-02-01 | 19B0579-06 | 8.12 ppb |
2019-02-01 | 19B0579-07 | 12.7 ppb |
2019-02-01 | 19B0579-08 | 8.55 ppb |
2019-02-01 | 19B0579-09 | 13.5 ppb |
2019-02-01 | 19B0579-10 | 10.1 ppb |
2019-02-01 | 19B0579-11 | 11.2 ppb |
2019-02-01 | 19B0579-12 | 11.4 ppb |
2019-05-01 | 19E0821-02 | 30.6 ppb |
2019-05-01 | 19E0821-06 | 25.4 ppb |
2019-05-01 | 19E0821-03 | 18.1 ppb |
2019-05-01 | 19E0821-01 | 21.2 ppb |
2019-05-01 | 19E0821-05 | 26.8 ppb |
2019-05-01 | 19E0821-04 | 25.4 ppb |
2019-05-02 | 19E0870-03 | 25.8 ppb |
2019-05-02 | 19E0870-02 | 25.9 ppb |
2019-05-02 | 19E0870-01 | 23.0 ppb |
2019-05-03 | 19E1121-02 | 31.8 ppb |
2019-05-03 | 19E1121-01 | 25.7 ppb |
2019-05-03 | 19E1121-03 | 24.2 ppb |
2019-08-01 | 19H1062-03 | 68.5 ppb |
2019-08-01 | 19H1062-06 | 77.3 ppb |
2019-08-01 | 19H1062-02 | 46.4 ppb |
2019-08-01 | 19H1062-01 | 59.7 ppb |
2019-08-01 | 19H1062-04 | 77.4 ppb |
2019-08-01 | 19H1062-05 | 68.8 ppb |
2019-08-02 | 19H1096-02 | 69.5 ppb |
2019-08-02 | 19H1096-05 | 67.9 ppb |
2019-08-02 | 19H1096-01 | 81.2 ppb |
2019-08-02 | 19H1096-04 | 81.9 ppb |
2019-08-02 | 19H1096-06 | 83.8 ppb |
2019-08-02 | 19H1096-03 | 74.4 ppb |
2019-11-01 | 19K0944-03 | 18.0 ppb |
2019-11-01 | 19K0946-02 | 27.2 ppb |
2019-11-01 | 19K0944-04 | 29.8 ppb |
2019-11-01 | 19K0944-06 | 30.0 ppb |
2019-11-01 | 19K0944-01 | 28.7 ppb |
2019-11-01 | 19K0946-04 | 17.8 ppb |
2019-11-01 | 19K0944-02 | 29.5 ppb |
2019-11-01 | 19K0946-01 | 25.3 ppb |
2019-11-01 | 19K0946-06 | 36.3 ppb |
2019-11-01 | 19K0946-05 | 28.8 ppb |
2019-11-01 | 19K0946-03 | 26.7 ppb |
2019-11-01 | 19K0944-05 | 28.8 ppb |