Chloroform
City of Rock Hill
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 | 21.8 ppb | 56 | 56 | 3.10 ppb - 56.8 ppb |
2015 | 8.11 ppb | 56 | 56 | 1.70 ppb - 27.2 ppb |
2016 | 19.7 ppb | 64 | 64 | 8.40 ppb - 44.6 ppb |
2017 | 16.2 ppb | 64 | 53 | ND - 45.6 ppb |
2018 | 25.3 ppb | 64 | 64 | 4.60 ppb - 57.8 ppb |
2019 | 25.7 ppb | 64 | 64 | 11.3 ppb - 62.8 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 |
---|---|---|
2014-02-06 | 4020001-01 | 13.7 ppb |
2014-02-06 | 4020001-02 | 17.2 ppb |
2014-02-06 | 4020001-03 | 14.0 ppb |
2014-02-06 | 4020001-04 | 12.5 ppb |
2014-02-06 | 4020001-05 | 12.2 ppb |
2014-02-06 | 4020001-06 | 12.4 ppb |
2014-02-06 | 4020001-07 | 10.4 ppb |
2014-02-06 | 4020001-08 | 20.3 ppb |
2014-04-08 | 4040552-01 | 30.7 ppb |
2014-04-08 | 4040552-02 | 47.2 ppb |
2014-04-08 | 4040552-03 | 24.8 ppb |
2014-04-08 | 4040552-04REI | 25.2 ppb |
2014-04-08 | 4040552-05 | 40.6 ppb |
2014-04-08 | 4040552-06 | 40.9 ppb |
2014-04-08 | 4040552-07 | 18.0 ppb |
2014-04-08 | 4040552-08 | 16.0 ppb |
2014-05-01 | 4040651-01 | 49.2 ppb |
2014-05-01 | 4040651-02 | 37.7 ppb |
2014-05-01 | 4040651-03 | 52.2 ppb |
2014-05-01 | 4040651-04 | 49.5 ppb |
2014-05-01 | 4040651-05 | 46.9 ppb |
2014-05-01 | 4040651-06 | 39.6 ppb |
2014-05-01 | 4040651-07 | 44.6 ppb |
2014-05-01 | 4040651-08 | 56.8 ppb |
2014-07-08 | 4070597-01 | 22.5 ppb |
2014-07-08 | 4070597-02 | 22.6 ppb |
2014-07-08 | 4070597-03 | 23.6 ppb |
2014-07-08 | 4070597-04 | 13.9 ppb |
2014-07-08 | 4070597-05 | 25.8 ppb |
2014-07-08 | 4070597-06 | 17.2 ppb |
2014-07-08 | 4070597-07 | 11.1 ppb |
2014-07-08 | 4070597-08 | 11.1 ppb |
2014-07-29 | 4070503-01 | 23.2 ppb |
2014-07-29 | 4070503-02 | 12.3 ppb |
2014-07-29 | 4070503-03 | 16.0 ppb |
2014-07-29 | 4070503-04 | 13.6 ppb |
2014-07-29 | 4070503-05 | 28.7 ppb |
2014-07-29 | 4070503-06 | 18.7 ppb |
2014-07-29 | 4070503-07 | 11.4 ppb |
2014-07-29 | 4070503-08 | 39.1 ppb |
2014-10-07 | 4100458-01 | 24.3 ppb |
2014-10-07 | 4100458-02 | 19.7 ppb |
2014-10-07 | 4100458-03 | 20.8 ppb |
2014-10-07 | 4100458-04 | 16.0 ppb |
2014-10-07 | 4100458-05 | 8.50 ppb |
2014-10-07 | 4100458-06 | 14.2 ppb |
2014-10-07 | 4100458-07 | 10.5 ppb |
2014-10-07 | 4100458-08 | 11.7 ppb |
2014-11-06 | 4110001-01 | 10.1 ppb |
2014-11-06 | 4110001-02 | 3.80 ppb |
2014-11-06 | 4110001-03 | 8.40 ppb |
2014-11-06 | 4110001-04 | 5.00 ppb |
2014-11-06 | 4110001-05 | 10.9 ppb |
2014-11-06 | 4110001-06 | 6.00 ppb |
2014-11-06 | 4110001-07 | 3.30 ppb |
2014-11-06 | 4110001-08 | 3.10 ppb |
2015-01-06 | 5010385-02 | 8.50 ppb |
2015-01-06 | 5010385-03 | 3.80 ppb |
2015-01-06 | 5010385-04 | 4.80 ppb |
2015-01-06 | 5010385-05 | 3.80 ppb |
2015-01-06 | 5010385-06 | 2.30 ppb |
2015-01-06 | 5010385-07 | 3.10 ppb |
2015-01-06 | 5010385-08 | 3.00 ppb |
2015-01-06 | 5010385-09 | 3.00 ppb |
2015-02-05 | 5020002-01 | 2.90 ppb |
2015-02-05 | 5020002-02 | 1.70 ppb |
2015-02-05 | 5020002-03 | 2.40 ppb |
2015-02-05 | 5020002-04 | 2.10 ppb |
2015-02-05 | 5020002-05 | 2.90 ppb |
2015-02-05 | 5020002-06 | 3.00 ppb |
2015-02-05 | 5020002-07 | 2.90 ppb |
2015-02-05 | 5020002-08 | 1.70 ppb |
2015-04-08 | 5040491-01 | 3.60 ppb |
2015-04-08 | 5040491-02 | 3.10 ppb |
2015-04-08 | 5040491-03 | 4.20 ppb |
2015-04-08 | 5040491-04 | 3.70 ppb |
2015-04-08 | 5040491-05 | 2.70 ppb |
2015-04-08 | 5040491-06 | 2.50 ppb |
2015-04-08 | 5040491-07 | 2.30 ppb |
2015-04-08 | 5040491-08 | 2.70 ppb |
2015-04-30 | 5040088-01 | 27.2 ppb |
2015-04-30 | 5040088-02 | 25.3 ppb |
2015-04-30 | 5040088-03 | 25.5 ppb |
2015-04-30 | 5040088-04 | 26.7 ppb |
2015-04-30 | 5040088-05 | 26.6 ppb |
2015-04-30 | 5040088-06 | 26.6 ppb |
2015-04-30 | 5040088-07 | 19.6 ppb |
2015-04-30 | 5040088-08 | 22.9 ppb |
2015-07-07 | 5070463-01 | 11.0 ppb |
2015-07-07 | 5070463-02 | 6.20 ppb |
2015-07-07 | 5070463-03 | 8.00 ppb |
2015-07-07 | 5070463-04 | 6.30 ppb |
2015-07-07 | 5070463-05 | 3.50 ppb |
2015-07-07 | 5070463-06 | 5.90 ppb |
2015-07-07 | 5070463-07 | 3.00 ppb |
2015-07-07 | 5070463-08 | 4.00 ppb |
2015-08-05 | 5080001-01 | 11.8 ppb |
2015-08-05 | 5080001-02 | 7.30 ppb |
2015-08-05 | 5080001-03 | 9.70 ppb |
2015-08-05 | 5080001-04 | 10.7 ppb |
2015-08-05 | 5080001-05 | 12.1 ppb |
2015-08-05 | 5080001-06 | 11.4 ppb |
2015-08-05 | 5080001-07 | 6.60 ppb |
2015-08-05 | 5080001-08 | 7.00 ppb |
2015-11-05 | 5110009-01 | 10.00 ppb |
2015-11-05 | 5110009-02 | 6.00 ppb |
2015-11-05 | 5110009-03 | 6.80 ppb |
2015-11-05 | 5110009-04 | 5.60 ppb |
2015-11-05 | 5110009-05 | 7.40 ppb |
2015-11-05 | 5110009-06 | 7.20 ppb |
2015-11-05 | 5110009-07 | 4.00 ppb |
2015-11-05 | 5110009-08 | 5.50 ppb |
2016-01-06 | 6010439-02 | 30.2 ppb |
2016-01-06 | 6010439-03 | 32.9 ppb |
2016-01-06 | 6010439-08 | 20.6 ppb |
2016-01-06 | 6010439-069 | 30.2 ppb |
2016-01-06 | 6010439-01 | 30.8 ppb |
2016-01-06 | 6010439-04 | 31.6 ppb |
2016-01-06 | 6010439-05 | 30.8 ppb |
2016-01-06 | 6010439-07 | 25.5 ppb |
2016-02-04 | 6020009-03 | 15.7 ppb |
2016-02-04 | 6020009-01 | 24.6 ppb |
2016-02-04 | 6020009-02 | 18.3 ppb |
2016-02-04 | 6020009-04 | 14.9 ppb |
2016-02-04 | 6020009-05 | 12.6 ppb |
2016-02-04 | 6020009-06 | 11.7 ppb |
2016-02-04 | 6020009-08 | 11.2 ppb |
2016-02-04 | 6020009-07 | 8.40 ppb |
2016-04-05 | 6040427-02 | 15.8 ppb |
2016-04-05 | 6040427-03 | 20.7 ppb |
2016-04-05 | 6040427-08 | 12.5 ppb |
2016-04-05 | 6040427-06 | 13.0 ppb |
2016-04-05 | 6040427-10 | 15.8 ppb |
2016-04-05 | 6040427-04 | 15.7 ppb |
2016-04-05 | 6040427-05 | 13.3 ppb |
2016-04-05 | 6040427-07 | 10.6 ppb |
2016-05-05 | 6050009-03 | 17.2 ppb |
2016-05-05 | 6050009-01 | 19.8 ppb |
2016-05-05 | 6050009-02 | 13.0 ppb |
2016-05-05 | 6050009-04 | 13.9 ppb |
2016-05-05 | 6050009-05 | 16.4 ppb |
2016-05-05 | 6050009-06 | 15.7 ppb |
2016-05-05 | 6050009-08 | 11.6 ppb |
2016-05-05 | 6050009-07 | 10.00 ppb |
2016-07-06 | 6070436-02 | 27.4 ppb |
2016-07-06 | 6070436-03 | 32.5 ppb |
2016-07-06 | 6070436-08 | 13.2 ppb |
2016-07-06 | 6070436-06 | 16.2 ppb |
2016-07-06 | 6070436-01 | 24.2 ppb |
2016-07-06 | 6070436-04 | 18.2 ppb |
2016-07-06 | 6070436-05 | 17.2 ppb |
2016-07-06 | 6070436-07 | 12.1 ppb |
2016-08-16 | 6080010-03 | 44.6 ppb |
2016-08-16 | 6080010-01 | 44.1 ppb |
2016-08-16 | 6080010-02 | 19.5 ppb |
2016-08-16 | 6080010-04 | 27.5 ppb |
2016-08-16 | 6080010-05 | 34.2 ppb |
2016-08-16 | 6080010-06 | 25.8 ppb |
2016-08-16 | 6080010-08 | 17.0 ppb |
2016-08-16 | 6080010-07 | 20.1 ppb |
2016-10-04 | 6100352-02 | 17.9 ppb |
2016-10-04 | 6100352-03 | 27.9 ppb |
2016-10-04 | 6100352-08 | 14.7 ppb |
2016-10-04 | 6100352-06 | 15.3 ppb |
2016-10-04 | 6100352-01 | 23.0 ppb |
2016-10-04 | 6103052-04 | 19.3 ppb |
2016-10-04 | 6100352-05 | 11.3 ppb |
2016-10-04 | 6100352-07 | 8.80 ppb |
2016-11-01 | 6100091-03 | 17.2 ppb |
2016-11-01 | 6100091-01 | 34.4 ppb |
2016-11-01 | 6100091-02 | 15.5 ppb |
2016-11-01 | 6100091-04 | 13.4 ppb |
2016-11-01 | 6100091-05 | 23.0 ppb |
2016-11-01 | 6100091-06 | 17.3 ppb |
2016-11-01 | 6100091-08 | 10.8 ppb |
2016-11-01 | 6100091-07 | 11.5 ppb |
2017-01-03 | 7010295-03 | 1.10 ppb |
2017-01-03 | 7010295-04 | 1.10 ppb |
2017-01-03 | 7010295-09 | ND |
2017-01-03 | 7010295-07 | ND |
2017-01-03 | 7010295-02 | 1.20 ppb |
2017-01-03 | 7010295-05 | 1.10 ppb |
2017-01-03 | 7010295-06 | ND |
2017-01-03 | 7010295-08 | ND |
2017-01-31 | 7010091-03 | 13.5 ppb |
2017-01-31 | 7010091-01 | 14.5 ppb |
2017-01-31 | 7010091-02 | 12.2 ppb |
2017-01-31 | 7010091-04 | 8.40 ppb |
2017-01-31 | 7010091-05 | 19.5 ppb |
2017-01-31 | 7010091-06 | 14.1 ppb |
2017-01-31 | 7010091-08 | 8.30 ppb |
2017-01-31 | 7010091-07 | 9.80 ppb |
2017-04-04 | 7040403-03 | ND |
2017-04-04 | 7040403-04 | ND |
2017-04-04 | 7040403-09 | ND |
2017-04-04 | 7040403-07 | 1.000 ppb |
2017-04-04 | 7040403-02 | ND |
2017-04-04 | 7040403-05 | ND |
2017-04-04 | 7040403-06 | ND |
2017-04-04 | 7040403-08 | ND |
2017-05-02 | 7050009-03 | 27.7 ppb |
2017-05-02 | 7050009-01 | 27.9 ppb |
2017-05-02 | 7050009-02 | 21.9 ppb |
2017-05-02 | 7050009-04 | 22.2 ppb |
2017-05-02 | 7050009-05 | 24.0 ppb |
2017-05-02 | 7050009-06 | 28.3 ppb |
2017-05-02 | 7050009-08 | 21.9 ppb |
2017-05-02 | 7050009-07 | 19.2 ppb |
2017-07-05 | 7170369-03 | 39.4 ppb |
2017-07-05 | 7070369-04 | 37.6 ppb |
2017-07-05 | 7070369-08 | 24.6 ppb |
2017-07-05 | 7170369-06 | 26.0 ppb |
2017-07-05 | 7070369-02 | 30.4 ppb |
2017-07-05 | 7070369-09 | 30.4 ppb |
2017-07-05 | 7070369-05 | 23.4 ppb |
2017-07-05 | 7070369-07 | 20.1 ppb |
2017-08-01 | 7070126-03 | 33.5 ppb |
2017-08-01 | 7070126-01 | 45.6 ppb |
2017-08-01 | 7070126-02 | 25.2 ppb |
2017-08-01 | 7070126-04 | 24.9 ppb |
2017-08-01 | 7070126-05 | 31.5 ppb |
2017-08-01 | 7070126-06 | 25.4 ppb |
2017-08-01 | 7070126-08 | 17.1 ppb |
2017-08-01 | 7070126-07 | 16.4 ppb |
2017-10-03 | 7010048-03 | 26.6 ppb |
2017-10-03 | 7010048-04 | 28.8 ppb |
2017-10-03 | 7010048-09 | 17.6 ppb |
2017-10-03 | 7010048-07 | 19.9 ppb |
2017-10-03 | 7010408-02 | 31.4 ppb |
2017-10-03 | 7010048-05 | 20.7 ppb |
2017-10-03 | 7010048-06 | 13.4 ppb |
2017-10-03 | 7010048-08 | 10.2 ppb |
2017-10-31 | 7100091-03 | 17.9 ppb |
2017-10-31 | 7100091-01 | 18.2 ppb |
2017-10-31 | 7100091-02 | 14.0 ppb |
2017-10-31 | 7100091-04 | 13.2 ppb |
2017-10-31 | 7100091-05 | 15.6 ppb |
2017-10-31 | 7100091-06 | 14.9 ppb |
2017-10-31 | 7100091-08 | 11.3 ppb |
2017-10-31 | 7100091-07 | 10.8 ppb |
2018-01-02 | 8010275-04 | 19.3 ppb |
2018-01-02 | 8010275-09 | 7.70 ppb |
2018-01-02 | 8010275-03 | 11.4 ppb |
2018-01-02 | 8010275-07 | 8.40 ppb |
2018-01-02 | 8010275-02 | 8.00 ppb |
2018-01-02 | 8010275-05 | 11.2 ppb |
2018-01-02 | 8010275-08 | 5.30 ppb |
2018-01-02 | 8010275-06 | 8.10 ppb |
2018-01-29 | 8010091-01 | 12.0 ppb |
2018-01-29 | 8010091-02 | 6.00 ppb |
2018-01-29 | 8010091-03 | 7.50 ppb |
2018-01-29 | 8010091-04 | 4.90 ppb |
2018-01-29 | 8010091-05 | 7.50 ppb |
2018-01-29 | 8010091-06 | 7.50 ppb |
2018-01-29 | 8010091-07 | 4.90 ppb |
2018-01-29 | 8010091-08 | 4.60 ppb |
2018-04-23 | 8040418-04 | 18.6 ppb |
2018-04-23 | 8040418-09 | 14.0 ppb |
2018-04-23 | 8040418-03 | 18.2 ppb |
2018-04-23 | 8040418-07 | 14.2 ppb |
2018-04-23 | 8040418-02 | 18.7 ppb |
2018-04-23 | 8040418-05 | 16.4 ppb |
2018-04-23 | 8040418-08 | 14.8 ppb |
2018-04-23 | 8040418-06 | 13.6 ppb |
2018-05-01 | 8040091-01 | 31.6 ppb |
2018-05-01 | 8040091-02 | 33.9 ppb |
2018-05-01 | 8040091-03 | 32.4 ppb |
2018-05-01 | 8040091-04 | 28.7 ppb |
2018-05-01 | 8040091-05 | 36.3 ppb |
2018-05-01 | 8040091-06 | 32.9 ppb |
2018-05-01 | 8040091-07 | 20.6 ppb |
2018-05-01 | 8040091-08 | 21.8 ppb |
2018-07-03 | 8070490-04 | 57.8 ppb |
2018-07-03 | 8070490-09 | 34.8 ppb |
2018-07-03 | 8070490-03 | 49.3 ppb |
2018-07-03 | 8070490-07 | 40.4 ppb |
2018-07-03 | 8070490-02 | 43.5 ppb |
2018-07-03 | 8070490-05 | 40.6 ppb |
2018-07-03 | 8070490-08 | 29.8 ppb |
2018-07-03 | 8070490-06 | 37.0 ppb |
2018-07-31 | 8070123-01 | 50.3 ppb |
2018-07-31 | 8070123-02 | 25.3 ppb |
2018-07-31 | 8070123-03 | 36.0 ppb |
2018-07-31 | 8070123-04 | 34.0 ppb |
2018-07-31 | 8070123-05 | 34.8 ppb |
2018-07-31 | 8070123-06 | 28.4 ppb |
2018-07-31 | 8070123-07 | 27.0 ppb |
2018-08-02 | 8070123-09 | 40.2 ppb |
2018-10-02 | 8100475-02 | 44.7 ppb |
2018-10-02 | 8100475-03 | 43.6 ppb |
2018-10-02 | 8100475-04 | 54.2 ppb |
2018-10-02 | 8100475-05 | 42.1 ppb |
2018-10-02 | 8100475-06 | 25.5 ppb |
2018-10-02 | 8100475-07 | 37.1 ppb |
2018-10-02 | 8100475-08 | 26.0 ppb |
2018-10-02 | 8100475-09 | 33.5 ppb |
2018-10-30 | 8100143-01 | 30.1 ppb |
2018-10-30 | 8100143-02 | 22.9 ppb |
2018-10-30 | 8100143-03 | 29.8 ppb |
2018-10-30 | 8100143-04 | 24.4 ppb |
2018-10-30 | 8100143-05 | 26.1 ppb |
2018-10-30 | 8100143-06 | 29.9 ppb |
2018-10-30 | 8100143-07 | 19.6 ppb |
2018-10-30 | 8100143-08 | 18.8 ppb |
2019-01-02 | 9010352-02 | 15.0 ppb |
2019-01-02 | 9010352-03 | 17.9 ppb |
2019-01-02 | 9010352-04 | 19.7 ppb |
2019-01-02 | 9010352-05 | 16.5 ppb |
2019-01-02 | 9010352-07 | 15.8 ppb |
2019-01-02 | 9010352-08 | 11.6 ppb |
2019-01-02 | 9010352-09 | 13.8 ppb |
2019-01-08 | 9010667-01 | 11.3 ppb |
2019-02-05 | 9020010-01 | 17.5 ppb |
2019-02-05 | 9020010-02 | 14.5 ppb |
2019-02-05 | 9020010-03 | 17.8 ppb |
2019-02-05 | 9020010-04 | 15.4 ppb |
2019-02-05 | 9020010-05 | 19.0 ppb |
2019-02-05 | 9020010-06 | 18.2 ppb |
2019-02-05 | 9020010-07 | 13.8 ppb |
2019-02-05 | 9020010-08 | 13.7 ppb |
2019-04-02 | 9040490-02 | 19.9 ppb |
2019-04-02 | 9040490-03 | 22.2 ppb |
2019-04-02 | 9040490-04 | 19.6 ppb |
2019-04-02 | 9040490-05 | 24.9 ppb |
2019-04-02 | 9040490-06 | 12.2 ppb |
2019-04-02 | 9040490-07 | 14.8 ppb |
2019-04-02 | 9040490-08 | 12.2 ppb |
2019-04-02 | 9040490-09 | 17.2 ppb |
2019-04-30 | 9040164-01 | 36.8 ppb |
2019-04-30 | 9040164-02 | 22.7 ppb |
2019-04-30 | 9040164-03 | 33.8 ppb |
2019-04-30 | 9040164-04 | 22.2 ppb |
2019-04-30 | 9040164-05 | 26.7 ppb |
2019-04-30 | 9040164-06 | 23.4 ppb |
2019-04-30 | 9040164-07 | 17.8 ppb |
2019-04-30 | 9040164-08 | 16.6 ppb |
2019-07-09 | 9070745-03 | 40.0 ppb |
2019-07-09 | 9070745-04 | 38.4 ppb |
2019-07-09 | 9070745-05 | 26.3 ppb |
2019-07-09 | 9070745-06 | 20.9 ppb |
2019-07-09 | 9070745-07 | 29.8 ppb |
2019-07-09 | 9070745-08 | 22.8 ppb |
2019-07-09 | 9070745-09 | 23.1 ppb |
2019-07-09 | 9070745-02 | 31.9 ppb |
2019-07-30 | 9070120-01 | 62.8 ppb |
2019-07-30 | 9070120-02 | 40.1 ppb |
2019-07-30 | 9070120-03 | 45.3 ppb |
2019-07-30 | 9070120-04 | 42.9 ppb |
2019-07-30 | 9070120-05 | 49.9 ppb |
2019-07-30 | 9070120-06 | 44.4 ppb |
2019-07-30 | 9070120-07 | 24.4 ppb |
2019-07-30 | 9070120-08 | 23.0 ppb |
2019-10-01 | 9100409-02 | 38.2 ppb |
2019-10-01 | 9100409-03 | 38.6 ppb |
2019-10-01 | 9100409-04 | 41.6 ppb |
2019-10-01 | 9100409-05 | 33.5 ppb |
2019-10-01 | 9100409-06 | 24.5 ppb |
2019-10-01 | 9100409-07 | 33.0 ppb |
2019-10-01 | 9100409-08 | 24.4 ppb |
2019-10-01 | 9100409-09 | 25.4 ppb |
2019-10-29 | 9100165-01 | 31.7 ppb |
2019-10-29 | 9100165-02 | 35.4 ppb |
2019-10-29 | 9100165-03 | 33.8 ppb |
2019-10-29 | 9100165-04 | 21.4 ppb |
2019-10-29 | 9100165-05 | 30.5 ppb |
2019-10-29 | 9100165-06 | 30.7 ppb |
2019-10-29 | 9100165-07 | 21.4 ppb |
2019-10-29 | 9100165-08 | 20.8 ppb |