Chloroform
Beauregard Water Works District #3
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 | 6.32 ppb | 36 | 36 | 1.43 ppb - 12.3 ppb |
2015 | 6.81 ppb | 48 | 48 | 1.33 ppb - 16.8 ppb |
2016 | 6.00 ppb | 48 | 48 | 1.69 ppb - 15.3 ppb |
2017 | 6.66 ppb | 48 | 48 | 0.690 ppb - 21.8 ppb |
2018 | 7.36 ppb | 48 | 48 | 1.60 ppb - 47.3 ppb |
2019 | 6.69 ppb | 48 | 48 | 1.60 ppb - 13.1 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 |
---|---|---|
2014-03-25 | 1287963 | 2.61 ppb |
2014-03-25 | 1287965 | 1.84 ppb |
2014-03-25 | 1287966 | 4.08 ppb |
2014-03-25 | 1287967 | 6.91 ppb |
2014-03-25 | 1287968 | 11.6 ppb |
2014-03-25 | 1287969 | 11.6 ppb |
2014-03-25 | 1287963 | 2.61 ppb |
2014-03-25 | 1287965 | 1.84 ppb |
2014-03-25 | 1287966 | 4.08 ppb |
2014-03-25 | 1287967 | 6.91 ppb |
2014-03-25 | 1287968 | 11.6 ppb |
2014-03-25 | 1287969 | 11.6 ppb |
2014-06-25 | 1312926 | 5.99 ppb |
2014-06-25 | 1312927 | 4.90 ppb |
2014-06-25 | 1312928 | 10.8 ppb |
2014-06-25 | 1312929 | 1.43 ppb |
2014-06-25 | 1312930 | 12.3 ppb |
2014-06-25 | 1312931 | 10.5 ppb |
2014-06-25 | 1312926 | 5.99 ppb |
2014-06-25 | 1312927 | 4.90 ppb |
2014-06-25 | 1312928 | 10.8 ppb |
2014-06-25 | 1312929 | 1.43 ppb |
2014-06-25 | 1312930 | 12.3 ppb |
2014-06-25 | 1312931 | 10.5 ppb |
2014-12-03 | 1355129 | 7.03 ppb |
2014-12-03 | 1355130 | 2.83 ppb |
2014-12-03 | 1355131 | 3.54 ppb |
2014-12-03 | 1355132 | 2.42 ppb |
2014-12-03 | 1355133 | 11.1 ppb |
2014-12-03 | 1355134 | 2.28 ppb |
2014-12-03 | 1355129 | 7.03 ppb |
2014-12-03 | 1355130 | 2.83 ppb |
2014-12-03 | 1355131 | 3.54 ppb |
2014-12-03 | 1355132 | 2.42 ppb |
2014-12-03 | 1355133 | 11.1 ppb |
2014-12-03 | 1355134 | 2.28 ppb |
2015-03-24 | 1381708 | 3.42 ppb |
2015-03-24 | 1381712 | 4.58 ppb |
2015-03-24 | 1381713 | 8.16 ppb |
2015-03-24 | 1381714 | 2.67 ppb |
2015-03-24 | 1381715 | 14.7 ppb |
2015-03-24 | 1381716 | 14.0 ppb |
2015-03-24 | 1381708 | 3.42 ppb |
2015-03-24 | 1381712 | 4.58 ppb |
2015-03-24 | 1381713 | 8.16 ppb |
2015-03-24 | 1381714 | 2.67 ppb |
2015-03-24 | 1381715 | 14.7 ppb |
2015-03-24 | 1381716 | 14.0 ppb |
2015-06-23 | 1405172 | 2.82 ppb |
2015-06-23 | 1405174 | 3.25 ppb |
2015-06-23 | 1405175 | 2.86 ppb |
2015-06-23 | 1405176 | 5.02 ppb |
2015-06-23 | 1405177 | 9.18 ppb |
2015-06-23 | 1405178 | 16.8 ppb |
2015-06-23 | 1405172 | 2.82 ppb |
2015-06-23 | 1405174 | 3.25 ppb |
2015-06-23 | 1405175 | 2.86 ppb |
2015-06-23 | 1405176 | 5.02 ppb |
2015-06-23 | 1405177 | 9.18 ppb |
2015-06-23 | 1405178 | 16.8 ppb |
2015-09-24 | 1430267 | 4.23 ppb |
2015-09-24 | 1430270 | 4.83 ppb |
2015-09-24 | 1430271 | 12.2 ppb |
2015-09-24 | 1430272 | 3.00 ppb |
2015-09-24 | 1430273 | 15.9 ppb |
2015-09-24 | 1430274 | 2.90 ppb |
2015-09-24 | 1430267 | 4.23 ppb |
2015-09-24 | 1430270 | 4.83 ppb |
2015-09-24 | 1430271 | 12.2 ppb |
2015-09-24 | 1430272 | 3.00 ppb |
2015-09-24 | 1430273 | 15.9 ppb |
2015-09-24 | 1430274 | 2.90 ppb |
2015-12-09 | 1450373 | 8.89 ppb |
2015-12-09 | 1450374 | 5.25 ppb |
2015-12-09 | 1450375 | 1.33 ppb |
2015-12-09 | 1450376 | 2.07 ppb |
2015-12-09 | 1450377 | 1.94 ppb |
2015-12-09 | 1450378 | 13.4 ppb |
2015-12-09 | 1450373 | 8.89 ppb |
2015-12-09 | 1450374 | 5.25 ppb |
2015-12-09 | 1450375 | 1.33 ppb |
2015-12-09 | 1450376 | 2.07 ppb |
2015-12-09 | 1450377 | 1.94 ppb |
2015-12-09 | 1450378 | 13.4 ppb |
2016-03-22 | 1476807 | 8.84 ppb |
2016-03-22 | 1476808 | 5.26 ppb |
2016-03-22 | 1476809 | 4.67 ppb |
2016-03-22 | 1476810 | 2.58 ppb |
2016-03-22 | 1476811 | 12.9 ppb |
2016-03-22 | 1476812 | 2.43 ppb |
2016-03-22 | 1476807 | 8.84 ppb |
2016-03-22 | 1476808 | 5.26 ppb |
2016-03-22 | 1476809 | 4.67 ppb |
2016-03-22 | 1476810 | 2.58 ppb |
2016-03-22 | 1476811 | 12.9 ppb |
2016-03-22 | 1476812 | 2.43 ppb |
2016-06-27 | 1502670 | 5.20 ppb |
2016-06-27 | 1502671 | 7.87 ppb |
2016-06-27 | 1502672 | 3.82 ppb |
2016-06-27 | 1502673 | 2.53 ppb |
2016-06-27 | 1502674 | 15.3 ppb |
2016-06-27 | 1502675 | 9.62 ppb |
2016-06-27 | 1502670 | 5.20 ppb |
2016-06-27 | 1502671 | 7.87 ppb |
2016-06-27 | 1502672 | 3.82 ppb |
2016-06-27 | 1502673 | 2.53 ppb |
2016-06-27 | 1502674 | 15.3 ppb |
2016-06-27 | 1502675 | 9.62 ppb |
2016-09-27 | 1528120 | 7.45 ppb |
2016-09-27 | 1528121 | 4.06 ppb |
2016-09-27 | 1528122 | 4.47 ppb |
2016-09-27 | 1528123 | 2.62 ppb |
2016-09-27 | 1528124 | 3.00 ppb |
2016-09-27 | 1528125 | 14.1 ppb |
2016-09-27 | 1528120 | 7.45 ppb |
2016-09-27 | 1528121 | 4.06 ppb |
2016-09-27 | 1528122 | 4.47 ppb |
2016-09-27 | 1528123 | 2.62 ppb |
2016-09-27 | 1528124 | 3.00 ppb |
2016-09-27 | 1528125 | 14.1 ppb |
2016-12-19 | 1549784 | 3.25 ppb |
2016-12-19 | 1549785 | 3.47 ppb |
2016-12-19 | 1549786 | 5.60 ppb |
2016-12-19 | 1549787 | 1.69 ppb |
2016-12-19 | 1549788 | 1.81 ppb |
2016-12-19 | 1549789 | 11.4 ppb |
2016-12-19 | 1549784 | 3.25 ppb |
2016-12-19 | 1549785 | 3.47 ppb |
2016-12-19 | 1549786 | 5.60 ppb |
2016-12-19 | 1549787 | 1.69 ppb |
2016-12-19 | 1549788 | 1.81 ppb |
2016-12-19 | 1549789 | 11.4 ppb |
2017-03-02 | 35298738001 | 2.20 ppb |
2017-03-02 | 35298738002 | 10.00 ppb |
2017-03-02 | 35298738003 | 7.00 ppb |
2017-03-02 | 35298738004 | 3.90 ppb |
2017-03-02 | 35298738005 | 3.30 ppb |
2017-03-02 | 35298738006 | 1.70 ppb |
2017-03-02 | 35298738001 | 2.20 ppb |
2017-03-02 | 35298738002 | 10.00 ppb |
2017-03-02 | 35298738003 | 7.00 ppb |
2017-03-02 | 35298738004 | 3.90 ppb |
2017-03-02 | 35298738005 | 3.30 ppb |
2017-03-02 | 35298738006 | 1.70 ppb |
2017-06-01 | 35315802009 | 0.690 ppb |
2017-06-01 | 35315802010 | 1.40 ppb |
2017-06-01 | 35315802011 | 12.7 ppb |
2017-06-01 | 35315802012 | 6.50 ppb |
2017-06-01 | 35315802013 | 3.20 ppb |
2017-06-01 | 35315802014 | 13.5 ppb |
2017-06-01 | 35315802009 | 0.690 ppb |
2017-06-01 | 35315802010 | 1.40 ppb |
2017-06-01 | 35315802011 | 12.7 ppb |
2017-06-01 | 35315802012 | 6.50 ppb |
2017-06-01 | 35315802013 | 3.20 ppb |
2017-06-01 | 35315802014 | 13.5 ppb |
2017-09-07 | 35335094001 | 3.60 ppb |
2017-09-07 | 35335094002 | 13.7 ppb |
2017-09-07 | 35335094003 | 3.10 ppb |
2017-09-07 | 35335094004 | 4.40 ppb |
2017-09-07 | 35335094005 | 9.60 ppb |
2017-09-07 | 35335094006 | 21.8 ppb |
2017-09-07 | 35335094001 | 3.60 ppb |
2017-09-07 | 35335094002 | 13.7 ppb |
2017-09-07 | 35335094003 | 3.10 ppb |
2017-09-07 | 35335094004 | 4.40 ppb |
2017-09-07 | 35335094005 | 9.60 ppb |
2017-09-07 | 35335094006 | 21.8 ppb |
2017-12-06 | 35362366001 | 2.20 ppb |
2017-12-06 | 35362366002 | 13.7 ppb |
2017-12-06 | 35362366003 | 2.00 ppb |
2017-12-06 | 35362366004 | 7.50 ppb |
2017-12-06 | 35362366005 | 7.20 ppb |
2017-12-06 | 35362366006 | 5.00 ppb |
2017-12-06 | 35362366001 | 2.20 ppb |
2017-12-06 | 35362366002 | 13.7 ppb |
2017-12-06 | 35362366003 | 2.00 ppb |
2017-12-06 | 35362366004 | 7.50 ppb |
2017-12-06 | 35362366005 | 7.20 ppb |
2017-12-06 | 35362366006 | 5.00 ppb |
2018-03-07 | 35379177001 | 2.00 ppb |
2018-03-07 | 35379177002 | 10.7 ppb |
2018-03-07 | 35379177003 | 1.70 ppb |
2018-03-07 | 35379177004 | 3.00 ppb |
2018-03-07 | 35379177005 | 6.50 ppb |
2018-03-07 | 35379177006 | 4.30 ppb |
2018-03-07 | 35379177001 | 2.00 ppb |
2018-03-07 | 35379177002 | 10.7 ppb |
2018-03-07 | 35379177003 | 1.70 ppb |
2018-03-07 | 35379177004 | 3.00 ppb |
2018-03-07 | 35379177005 | 6.50 ppb |
2018-03-07 | 35379177006 | 4.30 ppb |
2018-06-13 | 35398741001 | 2.40 ppb |
2018-06-13 | 35398741002 | 11.2 ppb |
2018-06-13 | 35398741003 | 2.30 ppb |
2018-06-13 | 35398741004 | 5.20 ppb |
2018-06-13 | 35398741005 | 2.50 ppb |
2018-06-13 | 35398741006 | 8.00 ppb |
2018-06-13 | 35398741001 | 2.40 ppb |
2018-06-13 | 35398741002 | 11.2 ppb |
2018-06-13 | 35398741003 | 2.30 ppb |
2018-06-13 | 35398741004 | 5.20 ppb |
2018-06-13 | 35398741005 | 2.50 ppb |
2018-06-13 | 35398741006 | 8.00 ppb |
2018-09-04 | 35416221001 | 2.80 ppb |
2018-09-04 | 35416221002 | 3.10 ppb |
2018-09-04 | 35416221003 | 17.1 ppb |
2018-09-04 | 35416226001 | 8.70 ppb |
2018-09-04 | 35416226002 | 47.3 ppb |
2018-09-04 | 35416226003 | 8.00 ppb |
2018-09-04 | 35416221001 | 2.80 ppb |
2018-09-04 | 35416221002 | 3.10 ppb |
2018-09-04 | 35416221003 | 17.1 ppb |
2018-09-04 | 35416226001 | 8.70 ppb |
2018-09-04 | 35416226002 | 47.3 ppb |
2018-09-04 | 35416226003 | 8.00 ppb |
2018-12-12 | 35437374001 | 10.4 ppb |
2018-12-12 | 35437374002 | 6.80 ppb |
2018-12-12 | 35437374003 | 1.60 ppb |
2018-12-12 | 35437374004 | 3.80 ppb |
2018-12-12 | 35437374005 | 5.50 ppb |
2018-12-12 | 35437374006 | 1.70 ppb |
2018-12-12 | 35437374001 | 10.4 ppb |
2018-12-12 | 35437374002 | 6.80 ppb |
2018-12-12 | 35437374003 | 1.60 ppb |
2018-12-12 | 35437374004 | 3.80 ppb |
2018-12-12 | 35437374005 | 5.50 ppb |
2018-12-12 | 35437374006 | 1.70 ppb |
2019-03-11 | 35454715001 | 9.20 ppb |
2019-03-11 | 35454715002 | 4.20 ppb |
2019-03-11 | 35454716001 | 13.1 ppb |
2019-03-11 | 35454716002 | 1.80 ppb |
2019-03-11 | 35454716003 | 2.10 ppb |
2019-03-11 | 35454715001 | 9.20 ppb |
2019-03-11 | 35454715002 | 4.20 ppb |
2019-03-11 | 35454716001 | 13.1 ppb |
2019-03-11 | 35454716002 | 1.80 ppb |
2019-03-11 | 35454716003 | 2.10 ppb |
2019-03-14 | 35454715003 | 6.60 ppb |
2019-03-14 | 35454715003 | 6.60 ppb |
2019-06-03 | 35474282001 | 11.6 ppb |
2019-06-03 | 35474282002 | 2.30 ppb |
2019-06-03 | 35474282003 | 2.70 ppb |
2019-06-03 | 35474284001 | 10.5 ppb |
2019-06-03 | 35474284002 | 7.80 ppb |
2019-06-03 | 35474284003 | 4.50 ppb |
2019-06-03 | 35474282001 | 11.6 ppb |
2019-06-03 | 35474282002 | 2.30 ppb |
2019-06-03 | 35474282003 | 2.70 ppb |
2019-06-03 | 35474284001 | 10.5 ppb |
2019-06-03 | 35474284002 | 7.80 ppb |
2019-06-03 | 35474284003 | 4.50 ppb |
2019-09-03 | 35495824001 | 11.0 ppb |
2019-09-03 | 35495831001 | 12.5 ppb |
2019-09-03 | 35495831002 | 3.30 ppb |
2019-09-03 | 35495831003 | 3.00 ppb |
2019-09-03 | 35495824001 | 11.0 ppb |
2019-09-03 | 35495831001 | 12.5 ppb |
2019-09-03 | 35495831002 | 3.30 ppb |
2019-09-03 | 35495831003 | 3.00 ppb |
2019-09-26 | 35501131001 | 5.60 ppb |
2019-09-26 | 35501131002 | 9.90 ppb |
2019-09-26 | 35501131001 | 5.60 ppb |
2019-09-26 | 35501131002 | 9.90 ppb |
2019-12-02 | 35516981001 | 12.9 ppb |
2019-12-02 | 35516981002 | 4.20 ppb |
2019-12-02 | 35516981003 | 7.40 ppb |
2019-12-02 | 35516986001 | 10.7 ppb |
2019-12-02 | 35516986002 | 1.60 ppb |
2019-12-02 | 35516986003 | 2.00 ppb |
2019-12-02 | 35516981001 | 12.9 ppb |
2019-12-02 | 35516981002 | 4.20 ppb |
2019-12-02 | 35516981003 | 7.40 ppb |
2019-12-02 | 35516986001 | 10.7 ppb |
2019-12-02 | 35516986002 | 1.60 ppb |
2019-12-02 | 35516986003 | 2.00 ppb |