Chloroform
City of Pittsburg
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 | 0.466 ppb | 16 | 9 | ND - 1.40 ppb |
2015 | 0.550 ppb | 16 | 11 | ND - 1.40 ppb |
2016 | 0.656 ppb | 16 | 12 | ND - 1.40 ppb |
2017 | 0.694 ppb | 16 | 12 | ND - 3.00 ppb |
2018 | 0.258 ppb | 16 | 6 | ND - 0.780 ppb |
2019 | 0.0700 ppb | 16 | 2 | ND - 0.600 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 |
---|---|---|
2014-02-18 | 64050 | 0.930 ppb |
2014-02-18 | 64048 | ND |
2014-02-18 | 64046 | ND |
2014-02-18 | 64044 | ND |
2014-05-05 | 110651 | ND |
2014-05-05 | 110650 | ND |
2014-05-05 | 110649 | 0.730 ppb |
2014-05-05 | 110648 | ND |
2014-08-18 | 175959 | 0.920 ppb |
2014-08-18 | 175958 | 0.670 ppb |
2014-08-18 | 175960 | 1.40 ppb |
2014-08-18 | 175961 | 0.540 ppb |
2014-11-17 | 232963 | 1.000 ppb |
2014-11-17 | 232962 | ND |
2014-11-17 | 232961 | 0.740 ppb |
2014-11-17 | 232959 | 0.520 ppb |
2015-02-16 | 280167 | ND |
2015-02-16 | 280166 | ND |
2015-02-16 | 280165 | ND |
2015-02-16 | 280164 | ND |
2015-05-18 | 335678 | 1.20 ppb |
2015-05-18 | 335679 | 0.560 ppb |
2015-05-18 | 335681 | 1.40 ppb |
2015-05-18 | 335680 | 1.20 ppb |
2015-08-17 | 389586 | 0.580 ppb |
2015-08-17 | 389585 | 0.510 ppb |
2015-08-17 | 389584 | 0.560 ppb |
2015-08-17 | 389583 | 0.890 ppb |
2015-11-30 | 428169 | ND |
2015-11-30 | 428168 | 0.660 ppb |
2015-11-30 | 428167 | 0.730 ppb |
2015-11-30 | 428166 | 0.510 ppb |
2016-02-08 | 490888 | ND |
2016-02-08 | 490887 | ND |
2016-02-08 | 490889 | ND |
2016-02-08 | 490890 | ND |
2016-05-31 | 554880 | 0.660 ppb |
2016-05-31 | 554879 | 0.630 ppb |
2016-05-31 | 554878 | 0.650 ppb |
2016-05-31 | 554877 | 0.770 ppb |
2016-08-22 | 608696 | 0.750 ppb |
2016-08-22 | 608695 | 1.20 ppb |
2016-08-22 | 608694 | 1.20 ppb |
2016-08-22 | 608693 | 0.830 ppb |
2016-11-14 | 660742 | 0.500 ppb |
2016-11-14 | 660745 | 1.40 ppb |
2016-11-14 | 660744 | 0.510 ppb |
2016-11-14 | 660743 | 1.40 ppb |
2017-02-20 | 711819 | 3.00 ppb |
2017-02-20 | 711818 | 0.640 ppb |
2017-02-20 | 711817 | ND |
2017-02-20 | 711816 | 0.730 ppb |
2017-05-30 | 769043 | ND |
2017-05-30 | 769042 | 0.710 ppb |
2017-05-30 | 769041 | 0.500 ppb |
2017-05-30 | 769040 | 0.890 ppb |
2017-08-22 | 824889 | 0.540 ppb |
2017-08-22 | 824888 | 1.50 ppb |
2017-08-22 | 824890 | 0.720 ppb |
2017-08-22 | 824891 | 0.730 ppb |
2017-11-14 | 878982 | ND |
2017-11-14 | 878981 | 0.540 ppb |
2017-11-14 | 878980 | ND |
2017-11-14 | 878979 | 0.610 ppb |
2018-02-20 | 908563 | ND |
2018-02-20 | 908562 | ND |
2018-02-20 | 908561 | 0.570 ppb |
2018-02-20 | 908560 | ND |
2018-05-22 | 974788 | 0.720 ppb |
2018-05-22 | 974789 | 0.690 ppb |
2018-05-22 | 974791 | ND |
2018-05-22 | 974790 | ND |
2018-08-21 | 1030105 | ND |
2018-08-21 | 1030104 | ND |
2018-08-21 | 1030103 | 0.780 ppb |
2018-08-21 | 1030102 | ND |
2018-11-06 | 1074605 | 0.690 ppb |
2018-11-06 | 1074604 | 0.680 ppb |
2018-11-06 | 1074603 | ND |
2018-11-06 | 1074602 | ND |
2019-02-12 | 1121020 | ND |
2019-02-12 | 1121019 | ND |
2019-02-12 | 1121021 | ND |
2019-02-12 | 1121022 | ND |
2019-05-14 | 1157997 | ND |
2019-05-14 | 1157996 | ND |
2019-05-14 | 1157995 | ND |
2019-05-14 | 1157994 | 0.520 ppb |
2019-08-13 | 1223579 | ND |
2019-08-13 | 1223578 | 0.600 ppb |
2019-08-13 | 1223577 | ND |
2019-08-13 | 1223576 | ND |
2019-11-18 | 1277556 | ND |
2019-11-18 | 1277559 | ND |
2019-11-18 | 1277558 | ND |
2019-11-18 | 1277557 | ND |