Chloroform
Riverside Highland Water Company
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 | 0.407 ppb | 11 | 6 | ND - 0.870 ppb |
2015 | 0.408 ppb | 10 | 6 | ND - 0.980 ppb |
2016 | 0.503 ppb | 18 | 11 | ND - 1.20 ppb |
2017 | 0.546 ppb | 13 | 6 | ND - 1.60 ppb |
2018 | 0.562 ppb | 12 | 8 | ND - 1.40 ppb |
2019 | 0.580 ppb | 15 | 5 | ND - 1.90 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 |
---|---|---|
2014-01-06 | 4790-011-0848 | ND |
2014-07-02 | 4790-604-1334 | 0.830 ppb |
2014-07-02 | 4790-601-1314 | ND |
2014-07-02 | 4790-603-1300 | ND |
2014-07-02 | 4790-602-1356 | 0.700 ppb |
2014-07-07 | 4790-008-0830 | ND |
2014-10-06 | 4790-604-1440 | 0.780 ppb |
2014-10-06 | 4790-010-1041 | 0.870 ppb |
2014-10-06 | 4790-601-1320 | 0.790 ppb |
2014-10-06 | 4790-602-1400 | ND |
2014-10-06 | 4790-603-1419 | 0.510 ppb |
2015-01-06 | 4790-601-0936 | 0.570 ppb |
2015-01-06 | 4790-604-1013 | 0.510 ppb |
2015-01-06 | 4790-603-0906 | ND |
2015-01-06 | 4790-602-1036 | ND |
2015-04-01 | 4790-003-1000 | ND |
2015-04-02 | 4790-601-0853 | 0.980 ppb |
2015-10-02 | 4790-601-1221 | 0.910 ppb |
2015-10-02 | 4790-604-1243 | 0.590 ppb |
2015-10-02 | 4790-603-1319 | ND |
2015-10-02 | 4790-602-1304 | 0.520 ppb |
2016-01-05 | 4790-603-0749 | ND |
2016-01-05 | 4790-604-0839 | 0.690 ppb |
2016-01-05 | 4790-602-0814 | ND |
2016-01-05 | 4790-601-0906 | ND |
2016-04-05 | 4790-602-1112 | ND |
2016-04-05 | 4790-601-1053 | 0.520 ppb |
2016-04-05 | 4790-604-1302 | 0.650 ppb |
2016-04-05 | 4790-603-1245 | ND |
2016-07-06 | 4790-009-0945 | ND |
2016-07-07 | 4790-604-1034 | 0.530 ppb |
2016-07-07 | 4790-602-1005 | 1.000 ppb |
2016-07-07 | 4790-603-1021 | ND |
2016-07-07 | 4790-601-0950 | 1.20 ppb |
2016-10-04 | 4790-012-0825 | 1.000 ppb |
2016-10-05 | 4790-601-1041 | 0.920 ppb |
2016-10-05 | 4790-604-0955 | 0.800 ppb |
2016-10-05 | 4790-603-0930 | 0.640 ppb |
2016-10-05 | 4790-602-1009 | 1.10 ppb |
2017-01-05 | 4790-011-1030 | ND |
2017-04-05 | 4790-601-0846 | 1.20 ppb |
2017-04-05 | 4790-602-0831 | 0.580 ppb |
2017-04-05 | 4790-603-0813 | ND |
2017-04-05 | 4790-604-0901 | 0.920 ppb |
2017-07-05 | 5810-603-0850 | ND |
2017-07-05 | 5810-602-1041 | 1.40 ppb |
2017-07-05 | 5810-604-1055 | ND |
2017-07-05 | 5810-601-0955 | 1.60 ppb |
2017-10-04 | 5810-601-0937 | 1.40 ppb |
2017-10-04 | 5810-604-1058 | ND |
2017-10-04 | 5810-603-1012 | ND |
2017-10-04 | 5810-602-0955 | ND |
2018-01-05 | 5810-601-1039 | 1.10 ppb |
2018-01-05 | 5810-604-1231 | ND |
2018-01-05 | 5810-603-0946 | ND |
2018-01-05 | 5810-602-1016 | ND |
2018-07-10 | 4790-604-1300 | 1.40 ppb |
2018-07-10 | 4790-602-1041 | 0.590 ppb |
2018-07-10 | 4790-601-1236 | 0.640 ppb |
2018-07-10 | 4790-603-1010 | 0.540 ppb |
2018-10-09 | 4790-601-1019 | 1.30 ppb |
2018-10-09 | 4790-602-1036 | 0.620 ppb |
2018-10-09 | 4790-603-1057 | ND |
2018-10-09 | 4790-604-0956 | 0.550 ppb |
2019-01-03 | 4790-603-1055 | ND |
2019-01-03 | 4790-602-1033 | ND |
2019-01-03 | 4790-601-1010 | 1.80 ppb |
2019-04-08 | 4790-603-1309 | ND |
2019-04-08 | 4790-604-1456 | 1.60 ppb |
2019-04-08 | 4790-601-1416 | 1.80 ppb |
2019-04-08 | 4790-602-1348 | ND |
2019-07-03 | 4790-604-1441 | ND |
2019-07-03 | 4790-603-1310 | ND |
2019-07-03 | 4790-601-1353 | ND |
2019-07-03 | 4790-602-1339 | ND |
2019-10-02 | 4790-604-1246 | 1.60 ppb |
2019-10-02 | 4790-603-0931 | ND |
2019-10-02 | 4790-601-1024 | 1.90 ppb |
2019-10-02 | 4790-602-1000 | ND |