Chloroform
Pennsylvania American Water Pittsburgh
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 | 30.4 ppb | 48 | 48 | 13.4 ppb - 58.2 ppb |
2015 | 31.1 ppb | 48 | 48 | 8.20 ppb - 63.2 ppb |
2016 | 32.8 ppb | 48 | 48 | 15.1 ppb - 73.2 ppb |
2017 | 42.1 ppb | 48 | 48 | 17.6 ppb - 84.3 ppb |
2018 | 29.4 ppb | 48 | 48 | 13.9 ppb - 49.4 ppb |
2019 | 29.4 ppb | 48 | 48 | 14.4 ppb - 49.6 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 | 34312 | 13.8 ppb |
2014-02-11 | 34313 | 15.3 ppb |
2014-02-11 | 34314 | 14.9 ppb |
2014-02-11 | 34315 | 13.4 ppb |
2014-02-11 | 34317 | 13.9 ppb |
2014-02-11 | 34318 | 15.2 ppb |
2014-02-11 | 34319 | 15.0 ppb |
2014-02-11 | 34320 | 15.4 ppb |
2014-02-11 | 34321 | 16.1 ppb |
2014-02-11 | 34322 | 16.5 ppb |
2014-02-11 | 34323 | 22.6 ppb |
2014-02-11 | 34316 | 13.7 ppb |
2014-05-12 | 25691201 | 34.5 ppb |
2014-05-12 | 25691101 | 22.1 ppb |
2014-05-12 | 25690901 | 19.3 ppb |
2014-05-12 | 25690501 | 29.0 ppb |
2014-05-12 | 25690101 | 21.4 ppb |
2014-05-12 | 25690301 | 32.0 ppb |
2014-05-12 | 25690801 | 22.4 ppb |
2014-05-12 | 25690201 | 19.8 ppb |
2014-05-12 | 25690601 | 20.2 ppb |
2014-05-12 | 25691001 | 19.8 ppb |
2014-05-12 | 25690701 | 21.8 ppb |
2014-05-12 | 25690401 | 30.8 ppb |
2014-08-12 | 26527901 | 25.8 ppb |
2014-08-12 | 26527801 | 37.6 ppb |
2014-08-12 | 26527601 | 36.2 ppb |
2014-08-12 | 26526801 | 27.3 ppb |
2014-08-12 | 26526001 | 36.2 ppb |
2014-08-12 | 26526601 | 25.9 ppb |
2014-08-12 | 26527501 | 37.3 ppb |
2014-08-12 | 26526501 | 36.9 ppb |
2014-08-12 | 26527301 | 38.4 ppb |
2014-08-12 | 26527701 | 37.5 ppb |
2014-08-12 | 26527401 | 38.0 ppb |
2014-08-12 | 26526701 | 24.8 ppb |
2014-11-11 | 27371901 | 35.0 ppb |
2014-11-11 | 27371801 | 55.1 ppb |
2014-11-11 | 27371601 | 54.2 ppb |
2014-11-11 | 27370901 | 38.7 ppb |
2014-11-11 | 27370101 | 55.9 ppb |
2014-11-11 | 27370701 | 36.8 ppb |
2014-11-11 | 27371501 | 51.5 ppb |
2014-11-11 | 27370601 | 58.2 ppb |
2014-11-11 | 27371301 | 56.9 ppb |
2014-11-11 | 27371701 | 53.3 ppb |
2014-11-11 | 27371401 | 50.0 ppb |
2014-11-11 | 27370801 | 33.3 ppb |
2015-02-10 | 12458293 | 16.0 ppb |
2015-02-10 | 12458287 | 22.8 ppb |
2015-02-10 | 12458275 | 23.6 ppb |
2015-02-10 | 12458250 | 14.8 ppb |
2015-02-10 | 12458225 | 20.0 ppb |
2015-02-10 | 12458238 | 15.2 ppb |
2015-02-10 | 12458269 | 20.5 ppb |
2015-02-10 | 12458232 | 18.5 ppb |
2015-02-10 | 12458257 | 22.6 ppb |
2015-02-10 | 12458281 | 20.5 ppb |
2015-02-10 | 12458263 | 33.3 ppb |
2015-02-10 | 12458244 | 14.6 ppb |
2015-05-12 | 12815915 | 45.1 ppb |
2015-05-12 | 12815909 | 55.5 ppb |
2015-05-12 | 12815897 | 58.4 ppb |
2015-05-12 | 12815872 | 40.0 ppb |
2015-05-12 | 12815847 | 50.2 ppb |
2015-05-12 | 12815860 | 41.5 ppb |
2015-05-12 | 12815891 | 52.4 ppb |
2015-05-12 | 12815854 | 48.5 ppb |
2015-05-12 | 12815879 | 56.0 ppb |
2015-05-12 | 12815903 | 61.3 ppb |
2015-05-12 | 12815885 | 63.2 ppb |
2015-05-12 | 12815866 | 33.5 ppb |
2015-08-11 | 13198169 | 26.2 ppb |
2015-08-11 | 13198163 | 44.9 ppb |
2015-08-11 | 13198151 | 29.9 ppb |
2015-08-11 | 13198126 | 20.4 ppb |
2015-08-11 | 13198101 | 50.4 ppb |
2015-08-11 | 13198114 | 26.2 ppb |
2015-08-11 | 13198145 | 30.3 ppb |
2015-08-11 | 13198108 | 47.3 ppb |
2015-08-11 | 13198133 | 27.3 ppb |
2015-08-11 | 13198157 | 34.6 ppb |
2015-08-11 | 13198139 | 47.8 ppb |
2015-08-11 | 13198120 | 16.1 ppb |
2015-11-09 | 13573522 | 11.2 ppb |
2015-11-09 | 13573516 | 25.7 ppb |
2015-11-09 | 13573504 | 23.2 ppb |
2015-11-09 | 13573479 | 8.20 ppb |
2015-11-09 | 13573454 | 27.3 ppb |
2015-11-09 | 13573467 | 10.4 ppb |
2015-11-09 | 13573498 | 25.8 ppb |
2015-11-09 | 13573461 | 27.1 ppb |
2015-11-09 | 13573486 | 24.1 ppb |
2015-11-09 | 13573510 | 27.8 ppb |
2015-11-09 | 13573492 | 20.8 ppb |
2015-11-09 | 13573473 | 10.5 ppb |
2016-02-10 | 13927684 | 26.8 ppb |
2016-02-10 | 13927678 | 22.4 ppb |
2016-02-10 | 13927666 | 31.4 ppb |
2016-02-10 | 13927641 | 24.4 ppb |
2016-02-10 | 13927616 | 20.5 ppb |
2016-02-10 | 13927629 | 25.7 ppb |
2016-02-10 | 13927660 | 22.4 ppb |
2016-02-10 | 13927623 | 18.0 ppb |
2016-02-10 | 13927648 | 28.5 ppb |
2016-02-10 | 13927672 | 23.6 ppb |
2016-02-10 | 13927654 | 20.6 ppb |
2016-02-10 | 13927635 | 24.4 ppb |
2016-05-17 | 14329246 | 17.3 ppb |
2016-05-17 | 14329240 | 21.6 ppb |
2016-05-17 | 14329228 | 29.5 ppb |
2016-05-17 | 14329203 | 15.1 ppb |
2016-05-17 | 14329178 | 26.3 ppb |
2016-05-17 | 14329191 | 15.3 ppb |
2016-05-17 | 14329222 | 17.1 ppb |
2016-05-17 | 14329185 | 25.9 ppb |
2016-05-17 | 14329210 | 23.6 ppb |
2016-05-17 | 14329234 | 21.9 ppb |
2016-05-17 | 14329216 | 16.1 ppb |
2016-05-17 | 14329197 | 15.6 ppb |
2016-08-11 | 14821754 | 25.6 ppb |
2016-08-11 | 14821748 | 36.1 ppb |
2016-08-11 | 14821736 | 37.8 ppb |
2016-08-11 | 14821712 | 22.2 ppb |
2016-08-11 | 14821688 | 35.4 ppb |
2016-08-11 | 14821700 | 21.0 ppb |
2016-08-11 | 14821730 | 39.3 ppb |
2016-08-11 | 14821694 | 37.2 ppb |
2016-08-11 | 14821718 | 39.6 ppb |
2016-08-11 | 14821742 | 37.0 ppb |
2016-08-11 | 14821724 | 37.2 ppb |
2016-08-11 | 14821706 | 20.7 ppb |
2016-11-15 | 15297017 | 31.1 ppb |
2016-11-15 | 15297011 | 69.5 ppb |
2016-11-15 | 15296999 | 65.8 ppb |
2016-11-15 | 15296974 | 27.0 ppb |
2016-11-15 | 15296949 | 71.3 ppb |
2016-11-15 | 15296962 | 25.5 ppb |
2016-11-15 | 15296993 | 72.4 ppb |
2016-11-15 | 15296956 | 68.1 ppb |
2016-11-15 | 15296981 | 71.7 ppb |
2016-11-15 | 15297005 | 73.2 ppb |
2016-11-15 | 15296968 | 23.1 ppb |
2016-11-16 | 15296987 | 54.2 ppb |
2017-02-13 | 15724081 | 20.6 ppb |
2017-02-13 | 15724075 | 31.0 ppb |
2017-02-13 | 15724063 | 28.9 ppb |
2017-02-13 | 15724038 | 18.0 ppb |
2017-02-13 | 15724013 | 38.3 ppb |
2017-02-13 | 15724026 | 18.7 ppb |
2017-02-13 | 15724057 | 29.1 ppb |
2017-02-13 | 15724020 | 31.9 ppb |
2017-02-13 | 15724045 | 36.7 ppb |
2017-02-13 | 15724069 | 30.5 ppb |
2017-02-13 | 15724051 | 28.2 ppb |
2017-02-13 | 15724032 | 17.6 ppb |
2017-05-15 | 16176505 | 37.4 ppb |
2017-05-15 | 16176499 | 53.6 ppb |
2017-05-15 | 16176487 | 52.9 ppb |
2017-05-15 | 16176462 | 34.7 ppb |
2017-05-15 | 16176437 | 54.1 ppb |
2017-05-15 | 16176450 | 34.9 ppb |
2017-05-15 | 16176481 | 52.7 ppb |
2017-05-15 | 16176444 | 37.8 ppb |
2017-05-15 | 16176469 | 53.0 ppb |
2017-05-15 | 16176493 | 52.2 ppb |
2017-05-15 | 16176475 | 46.4 ppb |
2017-05-15 | 16176456 | 34.7 ppb |
2017-08-14 | 16646142 | 55.6 ppb |
2017-08-14 | 16646136 | 48.3 ppb |
2017-08-14 | 16646124 | 43.6 ppb |
2017-08-14 | 16646099 | 50.6 ppb |
2017-08-14 | 16646074 | 51.8 ppb |
2017-08-14 | 16646087 | 48.8 ppb |
2017-08-14 | 16646118 | 47.1 ppb |
2017-08-14 | 16646081 | 42.9 ppb |
2017-08-14 | 16646106 | 42.9 ppb |
2017-08-14 | 16646130 | 47.5 ppb |
2017-08-14 | 16646112 | 51.5 ppb |
2017-08-14 | 16646093 | 45.8 ppb |
2017-11-13 | 17091730 | 29.1 ppb |
2017-11-13 | 17091724 | 50.8 ppb |
2017-11-13 | 17091712 | 74.8 ppb |
2017-11-13 | 17091687 | 29.5 ppb |
2017-11-13 | 17091662 | 50.8 ppb |
2017-11-13 | 17091675 | 29.1 ppb |
2017-11-13 | 17091706 | 84.3 ppb |
2017-11-13 | 17091669 | 51.3 ppb |
2017-11-13 | 17091694 | 68.0 ppb |
2017-11-13 | 17091718 | 50.4 ppb |
2017-11-13 | 17091700 | 24.2 ppb |
2017-11-13 | 17091681 | 27.2 ppb |
2018-02-12 | 38547001 | 20.3 ppb |
2018-02-12 | 38546901 | 15.9 ppb |
2018-02-12 | 38546701 | 15.6 ppb |
2018-02-12 | 38546001 | 20.1 ppb |
2018-02-12 | 38545201 | 15.0 ppb |
2018-02-12 | 38545801 | 17.9 ppb |
2018-02-12 | 38546601 | 15.8 ppb |
2018-02-12 | 38545701 | 13.9 ppb |
2018-02-12 | 38546401 | 15.3 ppb |
2018-02-12 | 38546801 | 14.5 ppb |
2018-02-12 | 38546501 | 16.6 ppb |
2018-02-12 | 38545901 | 18.6 ppb |
2018-05-14 | 39396201 | 42.5 ppb |
2018-05-14 | 39396101 | 20.2 ppb |
2018-05-14 | 39395901 | 20.9 ppb |
2018-05-14 | 39395201 | 42.6 ppb |
2018-05-14 | 39394401 | 21.1 ppb |
2018-05-14 | 39395001 | 41.6 ppb |
2018-05-14 | 39395801 | 21.2 ppb |
2018-05-14 | 39394901 | 20.1 ppb |
2018-05-14 | 39395601 | 21.0 ppb |
2018-05-14 | 39396001 | 18.0 ppb |
2018-05-14 | 39395701 | 22.8 ppb |
2018-05-14 | 39395101 | 38.6 ppb |
2018-08-13 | 40661101 | 24.7 ppb |
2018-08-13 | 40661001 | 43.1 ppb |
2018-08-13 | 40660801 | 38.3 ppb |
2018-08-13 | 40660001 | 25.3 ppb |
2018-08-13 | 40659201 | 38.8 ppb |
2018-08-13 | 40659801 | 22.8 ppb |
2018-08-13 | 40660701 | 43.3 ppb |
2018-08-13 | 40659701 | 31.6 ppb |
2018-08-13 | 40660501 | 41.2 ppb |
2018-08-13 | 40660901 | 41.9 ppb |
2018-08-13 | 40660601 | 37.5 ppb |
2018-08-13 | 40659901 | 26.8 ppb |
2018-11-12 | 41772701 | 29.2 ppb |
2018-11-12 | 41772601 | 45.7 ppb |
2018-11-12 | 41772401 | 43.0 ppb |
2018-11-12 | 41771701 | 28.0 ppb |
2018-11-12 | 41770901 | 45.1 ppb |
2018-11-12 | 41771501 | 27.6 ppb |
2018-11-12 | 41772301 | 40.6 ppb |
2018-11-12 | 41771401 | 45.6 ppb |
2018-11-12 | 41772101 | 44.6 ppb |
2018-11-12 | 41772201 | 37.4 ppb |
2018-11-12 | 41771601 | 29.1 ppb |
2018-11-13 | 41772501 | 49.4 ppb |
2019-02-12 | 42859301 | 49.6 ppb |
2019-02-12 | 42859501 | 40.9 ppb |
2019-02-12 | 42858701 | 38.8 ppb |
2019-02-12 | 42859801 | 33.0 ppb |
2019-02-12 | 42859201 | 38.1 ppb |
2019-02-12 | 42859901 | 35.1 ppb |
2019-02-12 | 42860001 | 33.0 ppb |
2019-02-13 | 42859401 | 37.3 ppb |
2019-02-13 | 42859601 | 39.4 ppb |
2019-02-13 | 42858801 | 37.9 ppb |
2019-02-13 | 42859701 | 47.3 ppb |
2019-02-13 | 42860101 | 35.4 ppb |
2019-05-14 | 44023201 | 28.9 ppb |
2019-05-14 | 44023101 | 21.2 ppb |
2019-05-14 | 44023301 | 19.6 ppb |
2019-05-14 | 44023401 | 24.7 ppb |
2019-05-14 | 44022501 | 21.5 ppb |
2019-05-14 | 44022601 | 19.7 ppb |
2019-05-14 | 44023501 | 15.1 ppb |
2019-05-14 | 44023601 | 22.2 ppb |
2019-05-14 | 44023001 | 19.8 ppb |
2019-05-14 | 44023701 | 23.9 ppb |
2019-05-14 | 44023801 | 28.3 ppb |
2019-05-14 | 44023901 | 23.5 ppb |
2019-08-13 | 45840201 | 46.2 ppb |
2019-08-13 | 45840101 | 32.2 ppb |
2019-08-13 | 45840301 | 36.2 ppb |
2019-08-13 | 45840401 | 48.5 ppb |
2019-08-13 | 45839401 | 35.1 ppb |
2019-08-13 | 45839501 | 42.3 ppb |
2019-08-13 | 45840501 | 29.1 ppb |
2019-08-13 | 45840601 | 35.4 ppb |
2019-08-13 | 45840001 | 33.8 ppb |
2019-08-13 | 45840701 | 31.8 ppb |
2019-08-13 | 45840801 | 44.1 ppb |
2019-08-13 | 45840901 | 43.1 ppb |
2019-11-12 | 47371201 | 23.1 ppb |
2019-11-12 | 47371301 | 16.4 ppb |
2019-11-12 | 47371401 | 17.6 ppb |
2019-11-12 | 47371501 | 21.4 ppb |
2019-11-12 | 47371601 | 16.2 ppb |
2019-11-12 | 47371701 | 21.4 ppb |
2019-11-12 | 47371801 | 14.4 ppb |
2019-11-12 | 47371901 | 16.8 ppb |
2019-11-12 | 47372001 | 15.7 ppb |
2019-11-12 | 47372101 | 18.0 ppb |
2019-11-12 | 47372201 | 15.7 ppb |
2019-11-12 | 47372301 | 23.5 ppb |