Chloroform
City of Huntington Beach
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 | 6.43 ppb | 54 | 32 | ND - 17.2 ppb |
2015 | 7.89 ppb | 50 | 32 | ND - 28.9 ppb |
2016 | 4.44 ppb | 51 | 31 | ND - 17.1 ppb |
2017 | 4.65 ppb | 51 | 32 | ND - 27.8 ppb |
2018 | 2.80 ppb | 47 | 31 | ND - 7.37 ppb |
2019 | 3.10 ppb | 29 | 16 | ND - 14.1 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 |
---|---|---|
2014-01-15 | 4792-801-1135 | 7.90 ppb |
2014-01-15 | 4792-802-1200 | 10.6 ppb |
2014-01-15 | 4792-803-1230 | 9.00 ppb |
2014-01-15 | 4792-804-1240 | 3.90 ppb |
2014-01-15 | 4792-805-1210 | 9.00 ppb |
2014-01-15 | 4792-806-1125 | 9.40 ppb |
2014-01-15 | 4792-807-1220 | 10.2 ppb |
2014-01-15 | 4792-808-1150 | 9.30 ppb |
2014-02-12 | 4417-008-1010 | ND |
2014-02-12 | 4417-010-0925 | ND |
2014-02-12 | 4417-011-1020 | ND |
2014-02-12 | 4417-012-0750 | ND |
2014-02-12 | 4417-013-0850 | ND |
2014-02-12 | 4417-025-1000 | ND |
2014-03-10 | 4417-016-1000 | ND |
2014-04-15 | 4792-801-1235 | 10.5 ppb |
2014-04-15 | 4792-802-1250 | 10.6 ppb |
2014-04-15 | 4792-803-1200 | 9.80 ppb |
2014-04-15 | 4792-804-1220 | 6.00 ppb |
2014-04-15 | 4792-805-1145 | 10.6 ppb |
2014-04-15 | 4792-806-1055 | 12.3 ppb |
2014-04-15 | 4792-807-1130 | 9.00 ppb |
2014-04-15 | 4792-808-1115 | 5.40 ppb |
2014-05-06 | 4417-008-1105 | ND |
2014-05-06 | 4417-009-0850 | ND |
2014-05-06 | 4417-011-1115 | ND |
2014-05-06 | 4417-013-1000 | ND |
2014-05-06 | 4417-016-0920 | ND |
2014-05-06 | 4417-025-1050 | ND |
2014-06-24 | 4417-025-0855 | ND |
2014-06-24 | 4417-025-0910 | ND |
2014-07-16 | 4792-801-0845 | 14.1 ppb |
2014-07-16 | 4792-802-0920 | 13.2 ppb |
2014-07-16 | 4792-803-0935 | 16.8 ppb |
2014-07-16 | 4792-804-1025 | 10.8 ppb |
2014-07-16 | 4792-805-0945 | 16.5 ppb |
2014-07-16 | 4792-806-0820 | 13.1 ppb |
2014-07-16 | 4792-807-1000 | 11.4 ppb |
2014-07-16 | 4792-808-0905 | 17.2 ppb |
2014-08-06 | 4417-008-1010 | ND |
2014-08-06 | 4417-011-0950 | ND |
2014-08-06 | 4417-013-0910 | ND |
2014-08-06 | 4417-016-0850 | ND |
2014-08-06 | 4417-025-1025 | ND |
2014-10-15 | 4792-801-1140 | 12.4 ppb |
2014-10-15 | 4792-802-1315 | 12.2 ppb |
2014-10-15 | 4792-803-1225 | 9.97 ppb |
2014-10-15 | 4792-804-1055 | 7.04 ppb |
2014-10-15 | 4792-805-1305 | 13.9 ppb |
2014-10-15 | 4792-806-1120 | 13.0 ppb |
2014-10-15 | 4792-807-1245 | 10.4 ppb |
2014-10-15 | 4792-808-1205 | 11.8 ppb |
2014-11-12 | 4417-011-1025 | ND |
2014-11-12 | 4417-025-1105 | ND |
2015-01-15 | 1805-801-1105 | 7.88 ppb |
2015-01-15 | 1805-802-1140 | 9.26 ppb |
2015-01-15 | 1805-803-1150 | 9.51 ppb |
2015-01-15 | 1805-804-1230 | 8.76 ppb |
2015-01-15 | 1805-805-1200 | 12.0 ppb |
2015-01-15 | 1805-806-1045 | 11.2 ppb |
2015-01-15 | 1805-807-1210 | 8.86 ppb |
2015-01-15 | 1805-808-1125 | 2.75 ppb |
2015-02-18 | 4417-010-0950 | ND |
2015-02-18 | 4417-011-1025 | ND |
2015-02-18 | 4417-012-0840 | ND |
2015-03-30 | 4417-008-0840 | ND |
2015-03-30 | 4417-025-0855 | ND |
2015-04-15 | 1805-801-1005 | 12.2 ppb |
2015-04-15 | 1805-802-1035 | 19.4 ppb |
2015-04-15 | 1805-803-1050 | 17.5 ppb |
2015-04-15 | 1805-804-1215 | 1.75 ppb |
2015-04-15 | 1805-805-1105 | 20.4 ppb |
2015-04-15 | 1805-806-0945 | 15.7 ppb |
2015-04-15 | 1805-807-1115 | 17.6 ppb |
2015-04-15 | 1805-808-1025 | 15.9 ppb |
2015-05-05 | 4417-008-1045 | ND |
2015-05-05 | 4417-009-0840 | ND |
2015-05-05 | 4417-011-1030 | ND |
2015-06-08 | 4417-008-0915 | ND |
2015-06-08 | 4417-008-0930 | ND |
2015-07-15 | 1805-801-0929 | 18.2 ppb |
2015-07-15 | 1805-802-1015 | 27.8 ppb |
2015-07-15 | 1805-803-1028 | 16.8 ppb |
2015-07-15 | 1805-804-1112 | 11.4 ppb |
2015-07-15 | 1805-805-1040 | 28.9 ppb |
2015-07-15 | 1805-806-0908 | 12.9 ppb |
2015-07-15 | 1805-807-1051 | 14.7 ppb |
2015-07-15 | 1805-808-0955 | 16.9 ppb |
2015-07-30 | 4417-008-0920 | ND |
2015-07-30 | 4417-011-0940 | ND |
2015-07-30 | 4417-013-1110 | ND |
2015-07-30 | 4417-016-1010 | ND |
2015-07-30 | 4417-025-0905 | ND |
2015-10-14 | 1805-801-0850 | 2.01 ppb |
2015-10-14 | 1805-802-0930 | 8.02 ppb |
2015-10-14 | 1805-803-0942 | 7.16 ppb |
2015-10-14 | 1805-804-1030 | 3.29 ppb |
2015-10-14 | 1805-805-0955 | 6.11 ppb |
2015-10-14 | 1805-806-0750 | 10.00 ppb |
2015-10-14 | 1805-807-1015 | 14.4 ppb |
2015-10-14 | 1805-808-0920 | 5.03 ppb |
2015-11-03 | 4417-008-0940 | ND |
2015-11-03 | 4417-025-1000 | ND |
2015-11-05 | 4417-011-0810 | ND |
2016-01-13 | 1805-801-0807 | 5.68 ppb |
2016-01-13 | 1805-802-0850 | 4.30 ppb |
2016-01-13 | 1805-803-0859 | 4.96 ppb |
2016-01-13 | 1805-804-0828 | ND |
2016-01-13 | 1805-807-0920 | 3.82 ppb |
2016-01-13 | 1805-808-0840 | 5.98 ppb |
2016-01-14 | 1805-805-1050 | 5.36 ppb |
2016-01-14 | 1805-806-1005 | 10.5 ppb |
2016-02-02 | 4417-008-1030 | ND |
2016-02-02 | 4417-010-1115 | ND |
2016-02-02 | 4417-011-1010 | ND |
2016-02-02 | 4417-012-0805 | ND |
2016-02-02 | 4417-013-0935 | ND |
2016-02-02 | 4417-025-1050 | ND |
2016-04-13 | 1805-801-0832 | 3.31 ppb |
2016-04-13 | 1805-803-0925 | 5.54 ppb |
2016-04-13 | 1805-804-1001 | 5.67 ppb |
2016-04-13 | 1805-805-0936 | 5.54 ppb |
2016-04-13 | 1805-806-0810 | 3.44 ppb |
2016-04-13 | 1805-807-0946 | 6.44 ppb |
2016-04-13 | 1805-808-0914 | 5.90 ppb |
2016-04-27 | 1805-802-0945 | 9.40 ppb |
2016-05-03 | 4417-008-1020 | ND |
2016-05-03 | 4417-016-0850 | ND |
2016-05-03 | 4417-025-1005 | ND |
2016-05-25 | 4417-011-1040 | ND |
2016-07-12 | 1805-801-0815 | 5.56 ppb |
2016-07-12 | 1805-802-0845 | 7.28 ppb |
2016-07-12 | 1805-803-0855 | 8.60 ppb |
2016-07-12 | 1805-804-0935 | 6.09 ppb |
2016-07-12 | 1805-805-0905 | 8.08 ppb |
2016-07-12 | 1805-806-0730 | 5.30 ppb |
2016-07-12 | 1805-807-0920 | 10.2 ppb |
2016-07-12 | 1805-808-0835 | 7.00 ppb |
2016-07-28 | 4417-008-1020 | ND |
2016-07-28 | 4417-025-1045 | ND |
2016-08-17 | 4417-011-0830 | ND |
2016-09-14 | 4417-009-1100 | ND |
2016-09-22 | 4417-009-0840 | ND |
2016-10-12 | 1805-801-0805 | 11.0 ppb |
2016-10-12 | 1805-802-1024 | 12.7 ppb |
2016-10-12 | 1805-803-1034 | 6.05 ppb |
2016-10-12 | 1805-804-1102 | 10.1 ppb |
2016-10-12 | 1805-805-1041 | 8.53 ppb |
2016-10-12 | 1805-806-0737 | 9.84 ppb |
2016-10-12 | 1805-807-1047 | 17.1 ppb |
2016-10-12 | 1805-808-0820 | 7.32 ppb |
2016-10-17 | 4417-008-0850 | ND |
2016-10-17 | 4417-009-0810 | ND |
2016-11-08 | 4417-011-0935 | ND |
2016-11-08 | 4417-025-1015 | ND |
2017-01-12 | 1805-801-0954 | 6.64 ppb |
2017-01-12 | 1805-802-1114 | 6.02 ppb |
2017-01-12 | 1805-803-1128 | 5.23 ppb |
2017-01-12 | 1805-804-1220 | 1.63 ppb |
2017-01-12 | 1805-805-1139 | 6.07 ppb |
2017-01-12 | 1805-806-0911 | 6.57 ppb |
2017-01-12 | 1805-807-1146 | 6.85 ppb |
2017-01-12 | 1805-808-1050 | 4.38 ppb |
2017-02-16 | 4417-008-1030 | ND |
2017-02-16 | 4417-010-0950 | ND |
2017-02-16 | 4417-011-1020 | ND |
2017-02-16 | 4417-012-0925 | ND |
2017-02-16 | 4417-013-1105 | ND |
2017-02-16 | 4417-025-1045 | ND |
2017-04-12 | 1805-801-0805 | 27.8 ppb |
2017-04-12 | 1805-802-0918 | 5.86 ppb |
2017-04-12 | 1805-803-0926 | 7.03 ppb |
2017-04-12 | 1805-804-1020 | 12.5 ppb |
2017-04-12 | 1805-805-0936 | 5.79 ppb |
2017-04-12 | 1805-806-0740 | 23.5 ppb |
2017-04-12 | 1805-807-0945 | 7.79 ppb |
2017-04-12 | 1805-808-0821 | 11.3 ppb |
2017-04-19 | 4417-012-0850 | ND |
2017-05-17 | 4417-009-0830 | ND |
2017-05-17 | 4417-010-0945 | ND |
2017-05-17 | 4417-011-1015 | ND |
2017-05-17 | 4417-016-0850 | ND |
2017-05-17 | 4417-025-0805 | ND |
2017-07-12 | 1805-801-0818 | 14.1 ppb |
2017-07-12 | 1805-802-0840 | 7.62 ppb |
2017-07-12 | 1805-803-0850 | 6.18 ppb |
2017-07-12 | 1805-804-0937 | 14.8 ppb |
2017-07-12 | 1805-805-0855 | 6.81 ppb |
2017-07-12 | 1805-806-0800 | 7.17 ppb |
2017-07-12 | 1805-807-0915 | 5.79 ppb |
2017-07-12 | 1805-808-0830 | 5.46 ppb |
2017-08-02 | 4417-011-0855 | ND |
2017-08-17 | 4417-025-0935 | ND |
2017-09-19 | 4417-008-0900 | ND |
2017-10-11 | 1805-801-0934 | 1.38 ppb |
2017-10-11 | 1805-802-0959 | 3.04 ppb |
2017-10-11 | 1805-803-1009 | 2.64 ppb |
2017-10-11 | 1805-804-1048 | 4.51 ppb |
2017-10-11 | 1805-805-1021 | 3.90 ppb |
2017-10-11 | 1805-806-0915 | 1.30 ppb |
2017-10-11 | 1805-807-1030 | 2.93 ppb |
2017-10-11 | 1805-808-0948 | 4.54 ppb |
2017-10-25 | 4417-008-0820 | ND |
2017-10-25 | 4417-008-0830 | ND |
2017-10-25 | 4417-008-0840 | ND |
2017-10-25 | 4417-025-0900 | ND |
2018-01-10 | 1805-801-0802 | 2.17 ppb |
2018-01-10 | 1805-802-0832 | 2.44 ppb |
2018-01-10 | 1805-803-0845 | 1.52 ppb |
2018-01-10 | 1805-804-0925 | 2.47 ppb |
2018-01-10 | 1805-806-0741 | 2.31 ppb |
2018-01-10 | 1805-806-0854 | 1.75 ppb |
2018-01-10 | 1805-807-0907 | 1.90 ppb |
2018-01-10 | 1805-808-0818 | 1.16 ppb |
2018-01-24 | 4417-013-1100 | ND |
2018-02-14 | 4417-025-0840 | ND |
2018-03-07 | 4417-008-0800 | ND |
2018-04-11 | 1805-801-0843 | 6.63 ppb |
2018-04-11 | 1805-802-0951 | 7.29 ppb |
2018-04-11 | 1805-803-0940 | 6.25 ppb |
2018-04-11 | 1805-804-1018 | 6.37 ppb |
2018-04-11 | 1805-805-0930 | 6.63 ppb |
2018-04-11 | 1805-806-1045 | 5.07 ppb |
2018-04-11 | 1805-807-0921 | 6.34 ppb |
2018-04-11 | 1805-808-1006 | 7.37 ppb |
2018-05-01 | 4417-008-1115 | ND |
2018-05-01 | 4417-009-1000 | ND |
2018-05-01 | 4417-010-1020 | ND |
2018-05-01 | 4417-016-0945 | ND |
2018-05-01 | 4417-025-1100 | ND |
2018-06-07 | 4417-011-0820 | ND |
2018-07-10 | 1805-801-0800 | 4.34 ppb |
2018-07-10 | 1805-802-0925 | 4.50 ppb |
2018-07-10 | 1805-803-0932 | 4.06 ppb |
2018-07-10 | 1805-804-0910 | 2.85 ppb |
2018-07-10 | 1805-805-0940 | 4.21 ppb |
2018-07-10 | 1805-806-0745 | 3.60 ppb |
2018-07-10 | 1805-807-0955 | 3.97 ppb |
2018-07-10 | 1805-808-0916 | 4.14 ppb |
2018-07-31 | 4417-025-0845 | ND |
2018-08-07 | 4417-011-0835 | ND |
2018-09-19 | 4417-008-0825 | ND |
2018-10-10 | 1805-801-0915 | 4.81 ppb |
2018-10-10 | 1805-802-0802 | 4.66 ppb |
2018-10-10 | 1805-803-0830 | 5.12 ppb |
2018-10-10 | 1805-804-0905 | 2.85 ppb |
2018-10-10 | 1805-805-0810 | 5.26 ppb |
2018-10-10 | 1805-806-0930 | ND |
2018-10-10 | 1805-807-0820 | 5.62 ppb |
2018-10-10 | 1805-808-0840 | 4.13 ppb |
2018-10-23 | 4417-008-1000 | ND |
2018-10-23 | 4417-011-0945 | ND |
2018-10-23 | 4417-025-1015 | ND |
2019-01-16 | 4417-008-0920 | ND |
2019-01-16 | 4417-010-1025 | ND |
2019-01-16 | 4417-011-0835 | ND |
2019-01-16 | 4417-012-1000 | ND |
2019-01-16 | 4417-013-0730 | ND |
2019-01-16 | 4417-016-0805 | ND |
2019-01-16 | 4417-025-0900 | ND |
2019-04-09 | 4417-009-0900 | ND |
2019-04-09 | 4417-025-1030 | ND |
2019-04-11 | 4417-008-0935 | ND |
2019-07-01 | 4417-011-1015 | ND |
2019-07-01 | 4417-025-0945 | ND |
2019-07-10 | 1805-801-0840 | 5.78 ppb |
2019-07-10 | 1805-802-0905 | 3.50 ppb |
2019-07-10 | 1805-803-0912 | 4.81 ppb |
2019-07-10 | 1805-804-0735 | 6.16 ppb |
2019-07-10 | 1805-805-0920 | 5.40 ppb |
2019-07-10 | 1805-806-0825 | 6.51 ppb |
2019-07-10 | 1805-807-0930 | 4.81 ppb |
2019-07-10 | 1805-808-0855 | 4.87 ppb |
2019-10-09 | 1805-801-0850 | 3.83 ppb |
2019-10-09 | 1805-802-0930 | 3.63 ppb |
2019-10-09 | 1805-803-1030 | 4.88 ppb |
2019-10-09 | 1805-804-1130 | 6.58 ppb |
2019-10-09 | 1805-805-1035 | 4.64 ppb |
2019-10-09 | 1805-806-0830 | 4.28 ppb |
2019-10-09 | 1805-807-1040 | 14.1 ppb |
2019-10-09 | 1805-808-0915 | 6.15 ppb |
2019-10-29 | 4417-025-0905 | ND |