Chloroform
Charlotte Water
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.
300
Samples
0
Samples exceeding legal limit (MCL)
300
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 15.1 ppb | 48 | 48 | 4.00 ppb - 25.0 ppb |
| 2015 | 6.83 ppb | 48 | 48 | 1.80 ppb - 15.6 ppb |
| 2016 | 23.4 ppb | 48 | 48 | 7.60 ppb - 40.8 ppb |
| 2017 | 25.2 ppb | 48 | 48 | 10.2 ppb - 49.9 ppb |
| 2018 | 33.3 ppb | 48 | 48 | 7.90 ppb - 71.3 ppb |
| 2019 | 30.8 ppb | 60 | 60 | 12.5 ppb - 55.3 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 |
|---|---|---|
| 2014-02-05 | AE90835-TH | 17.0 ppb |
| 2014-02-05 | AE90834-TH | 17.0 ppb |
| 2014-02-05 | AE90829-TH | 19.0 ppb |
| 2014-02-05 | AE90830-TH | 22.0 ppb |
| 2014-02-05 | AE90826-TH | 22.0 ppb |
| 2014-02-05 | AE90831-TH | 24.0 ppb |
| 2014-02-05 | AE90836-TH | 16.0 ppb |
| 2014-02-05 | AE90843-TH | 25.0 ppb |
| 2014-02-05 | AE90841-TH | 16.0 ppb |
| 2014-02-05 | AE90842-TH | 13.0 ppb |
| 2014-02-05 | AE90840-TH | 19.0 ppb |
| 2014-02-05 | AE90832-TH | 18.0 ppb |
| 2014-05-07 | AF00978-TH | 16.0 ppb |
| 2014-05-07 | AF00980-TH | 21.0 ppb |
| 2014-05-07 | AF00979-TH | 17.0 ppb |
| 2014-05-07 | AF00960-TH | 21.0 ppb |
| 2014-05-07 | AF00961-TH | 25.0 ppb |
| 2014-05-07 | AF00962-TH | 23.0 ppb |
| 2014-05-07 | AF00959-TH | 20.0 ppb |
| 2014-05-07 | AF00981-TH | 21.0 ppb |
| 2014-05-07 | AF00976-TH | 21.0 ppb |
| 2014-05-07 | AF00977-TH | 17.0 ppb |
| 2014-05-07 | AF00975-TH | 11.0 ppb |
| 2014-05-07 | AF00973-TH | 18.0 ppb |
| 2014-08-13 | AF10793-TH | 20.0 ppb |
| 2014-08-13 | AF10792-TH | 15.0 ppb |
| 2014-08-13 | AF10781-TH | 17.0 ppb |
| 2014-08-13 | AF10782-TH | 21.0 ppb |
| 2014-08-13 | A10783-TH | 21.0 ppb |
| 2014-08-13 | AF10780-TH | 14.0 ppb |
| 2014-08-13 | AF10794-TH | 14.0 ppb |
| 2014-08-13 | AF10791-TH | 15.0 ppb |
| 2014-08-13 | AF10789-TH | 17.0 ppb |
| 2014-08-13 | AF10787-TH | 11.0 ppb |
| 2014-08-13 | AF10788-TH | 10.00 ppb |
| 2014-08-13 | AF10790-TH | 12.0 ppb |
| 2014-11-05 | AF19441-TH | 6.00 ppb |
| 2014-11-05 | AF19443-TH | 6.00 ppb |
| 2014-11-05 | AF19448-TH | 5.00 ppb |
| 2014-11-05 | AF19449-TH | 10.00 ppb |
| 2014-11-05 | AF19450-TH | 9.00 ppb |
| 2014-11-05 | AF19447-TH | 7.00 ppb |
| 2014-11-05 | AF19444-TH | 6.00 ppb |
| 2014-11-05 | AF19442-TH | 6.00 ppb |
| 2014-11-05 | AF19454-TH | 9.00 ppb |
| 2014-11-05 | AF19451-TH | 4.00 ppb |
| 2014-11-05 | AF19453-TH | 5.00 ppb |
| 2014-11-05 | AF19455-TH | 6.00 ppb |
| 2015-03-04 | 4.30 ppb | |
| 2015-03-04 | 2.90 ppb | |
| 2015-03-04 | 6.60 ppb | |
| 2015-03-04 | 5.70 ppb | |
| 2015-03-04 | 4.70 ppb | |
| 2015-03-04 | 4.10 ppb | |
| 2015-03-04 | 5.80 ppb | |
| 2015-03-04 | 3.40 ppb | |
| 2015-03-04 | 3.40 ppb | |
| 2015-03-04 | 3.70 ppb | |
| 2015-03-04 | 4.40 ppb | |
| 2015-03-04 | 4.80 ppb | |
| 2015-05-06 | 5.20 ppb | |
| 2015-05-06 | 9.80 ppb | |
| 2015-05-06 | 6.20 ppb | |
| 2015-05-06 | 7.70 ppb | |
| 2015-05-06 | 8.00 ppb | |
| 2015-05-06 | 7.70 ppb | |
| 2015-05-06 | 6.90 ppb | |
| 2015-05-06 | 6.50 ppb | |
| 2015-05-06 | 10.00 ppb | |
| 2015-05-06 | 5.90 ppb | |
| 2015-05-06 | 6.30 ppb | |
| 2015-05-06 | 8.90 ppb | |
| 2015-08-06 | 10.1 ppb | |
| 2015-08-06 | 9.60 ppb | |
| 2015-08-06 | 10.1 ppb | |
| 2015-08-06 | 13.2 ppb | |
| 2015-08-06 | 10.8 ppb | |
| 2015-08-06 | 15.6 ppb | |
| 2015-08-06 | 11.5 ppb | |
| 2015-08-06 | 9.20 ppb | |
| 2015-08-06 | 13.8 ppb | |
| 2015-08-06 | 8.90 ppb | |
| 2015-08-06 | 6.20 ppb | |
| 2015-08-06 | 8.30 ppb | |
| 2015-11-04 | 6.40 ppb | |
| 2015-11-04 | 5.20 ppb | |
| 2015-11-04 | 5.30 ppb | |
| 2015-11-04 | 5.60 ppb | |
| 2015-11-04 | 5.20 ppb | |
| 2015-11-04 | 3.60 ppb | |
| 2015-11-04 | 4.70 ppb | |
| 2015-11-04 | 3.90 ppb | |
| 2015-11-04 | 5.70 ppb | |
| 2015-11-04 | 5.10 ppb | |
| 2015-11-04 | 1.80 ppb | |
| 2015-11-04 | 5.10 ppb | |
| 2016-02-03 | AF65959_TH | 14.6 ppb |
| 2016-02-03 | AF65947_TH | 10.00 ppb |
| 2016-02-03 | AF65956_TH | 18.0 ppb |
| 2016-02-03 | AF65957_TH | 12.1 ppb |
| 2016-02-03 | AF65954_TH | 14.3 ppb |
| 2016-02-03 | AF65950_TH | 17.4 ppb |
| 2016-02-03 | AF65953_TH | 17.6 ppb |
| 2016-02-03 | AF65955_TH | 11.5 ppb |
| 2016-02-03 | AF65948_TH | 7.60 ppb |
| 2016-02-03 | AF65949_TH | 14.3 ppb |
| 2016-02-03 | AF65952_TH | 14.7 ppb |
| 2016-02-03 | AF65960_TH | 12.7 ppb |
| 2016-05-04 | AF76687_TH | 28.9 ppb |
| 2016-05-04 | AF76688_TH | 29.6 ppb |
| 2016-05-04 | AF76694_TH | 30.5 ppb |
| 2016-05-04 | AF76695_TH | 30.0 ppb |
| 2016-05-04 | AF76696_TH | 28.5 ppb |
| 2016-05-04 | AF76697_TH | 29.0 ppb |
| 2016-05-04 | AF76698_TH | 29.5 ppb |
| 2016-05-04 | AF76686_TH | 28.3 ppb |
| 2016-05-04 | AF76689_TH | 30.7 ppb |
| 2016-05-04 | AF76691_TH | 27.0 ppb |
| 2016-05-04 | AF76692_TH | 34.3 ppb |
| 2016-05-04 | AF76693_TH | 23.0 ppb |
| 2016-08-03 | AF87851_DBP | 21.6 ppb |
| 2016-08-03 | AF87856_DBP | 37.4 ppb |
| 2016-08-03 | AF87857_DBP | 35.8 ppb |
| 2016-08-03 | AF87853_DBP | 36.1 ppb |
| 2016-08-03 | AF87854_DBP | 34.9 ppb |
| 2016-08-03 | AF87855_DBP | 33.1 ppb |
| 2016-08-03 | AF87859_DBP | 29.4 ppb |
| 2016-08-03 | AF87860_DBP | 33.7 ppb |
| 2016-08-03 | AF87864_DBP | 40.8 ppb |
| 2016-08-03 | AF87852_DBP | 33.9 ppb |
| 2016-08-03 | AF87858_DBP | 34.3 ppb |
| 2016-08-03 | AF87863_DBP | 36.4 ppb |
| 2016-11-02 | AF98951_TH | 17.0 ppb |
| 2016-11-02 | AF98918_TH | 18.3 ppb |
| 2016-11-02 | AF98948_TH | 16.2 ppb |
| 2016-11-02 | AF98954_TH | 16.9 ppb |
| 2016-11-02 | AF98917_TH | 18.2 ppb |
| 2016-11-02 | AF98919_TH | 16.4 ppb |
| 2016-11-02 | AF98956_TH | 17.1 ppb |
| 2016-11-02 | AF98916_TH | 16.0 ppb |
| 2016-11-02 | AF98947_TH | 15.5 ppb |
| 2016-11-02 | AF98950_TH | 17.2 ppb |
| 2016-11-02 | AF98953_TH | 16.4 ppb |
| 2016-11-02 | AF98955_TH | 17.5 ppb |
| 2017-02-01 | AG08731_TH | 21.3 ppb |
| 2017-02-01 | AG08755_TH | 12.3 ppb |
| 2017-02-01 | AG08725_TH | 17.4 ppb |
| 2017-02-01 | AG08727_TH | 18.5 ppb |
| 2017-02-01 | AG08730_TH | 15.3 ppb |
| 2017-02-01 | AG08754_TH | 16.6 ppb |
| 2017-02-01 | AG08726_TH | 19.4 ppb |
| 2017-02-01 | AG08735_TH | 15.3 ppb |
| 2017-02-01 | AG08756_TH | 15.2 ppb |
| 2017-02-01 | AG08728_TH | 10.2 ppb |
| 2017-02-01 | AG08734_TH | 17.9 ppb |
| 2017-02-01 | AG08752_TH | 11.3 ppb |
| 2017-05-03 | AG19630_TH | 19.8 ppb |
| 2017-05-03 | AG19634_TH | 22.2 ppb |
| 2017-05-03 | AG19624_TH | 23.8 ppb |
| 2017-05-03 | AG19622_TH | 24.0 ppb |
| 2017-05-03 | AG19635_TH | 19.2 ppb |
| 2017-05-03 | AG19625_TH | 22.1 ppb |
| 2017-05-03 | AG19631_TH | 20.8 ppb |
| 2017-05-03 | AG19636_TH | 20.2 ppb |
| 2017-05-03 | AG19623_TH | 24.5 ppb |
| 2017-05-03 | AG19637_TH | 21.0 ppb |
| 2017-05-03 | AG19638TH | 15.9 ppb |
| 2017-05-03 | AG19639_TH | 21.8 ppb |
| 2017-08-02 | AG30505_TH | 43.4 ppb |
| 2017-08-02 | AG30504_TH | 42.5 ppb |
| 2017-08-02 | AG30507_TH | 47.8 ppb |
| 2017-08-02 | AG30510_TH | 26.3 ppb |
| 2017-08-02 | AG30508_TH | 46.9 ppb |
| 2017-08-02 | AG30509_TH | 41.4 ppb |
| 2017-08-02 | AG30511_TH | 36.3 ppb |
| 2017-08-02 | AG30506_TH | 49.9 ppb |
| 2017-08-02 | AG30530_TH | 42.6 ppb |
| 2017-08-02 | AG30526_TH | 42.6 ppb |
| 2017-08-02 | AG30527_TH | 41.5 ppb |
| 2017-08-02 | AG30532_TH | 31.2 ppb |
| 2017-11-01 | AG41985_TH | 20.6 ppb |
| 2017-11-01 | AG41991_TH | 24.5 ppb |
| 2017-11-01 | AG41965_TH | 25.6 ppb |
| 2017-11-01 | AG41963_TH | 26.0 ppb |
| 2017-11-01 | AG41984_TH | 20.4 ppb |
| 2017-11-01 | AG41993_TH | 30.9 ppb |
| 2017-11-01 | AG41964_TH | 25.3 ppb |
| 2017-11-01 | AG41967_TH | 20.4 ppb |
| 2017-11-01 | AG41989_TH | 14.8 ppb |
| 2017-11-01 | AG41962_TH | 23.8 ppb |
| 2017-11-01 | AG41995_TH | 22.0 ppb |
| 2017-11-01 | AG41966_TH | 16.7 ppb |
| 2018-02-07 | AG53093_TH | 12.0 ppb |
| 2018-02-07 | AG53094_TH | 12.8 ppb |
| 2018-02-07 | AG53095_TH | 14.9 ppb |
| 2018-02-07 | AG53132_TH | 7.90 ppb |
| 2018-02-07 | AG53133_TH | 21.5 ppb |
| 2018-02-07 | AG53142_TH | 16.5 ppb |
| 2018-02-07 | AG53143_TH | 12.9 ppb |
| 2018-02-07 | AG53144_TH | 17.2 ppb |
| 2018-02-07 | AG53145_TH | 19.3 ppb |
| 2018-02-07 | AG53146_TH | 18.3 ppb |
| 2018-02-07 | AG53171_TH | 13.2 ppb |
| 2018-02-07 | AG53172_TH | 17.9 ppb |
| 2018-05-02 | AG63056_TH | 22.3 ppb |
| 2018-05-02 | AG63057_TH | 28.3 ppb |
| 2018-05-02 | AG63058_TH | 22.4 ppb |
| 2018-05-02 | AG63121_TH | 23.1 ppb |
| 2018-05-02 | AG63122_TH | 28.4 ppb |
| 2018-05-02 | AG63125_TH | 33.4 ppb |
| 2018-05-02 | AG63126_TH | 33.9 ppb |
| 2018-05-02 | AG63127_TH | 33.8 ppb |
| 2018-05-02 | AG63128_TH | 29.3 ppb |
| 2018-05-02 | AG63140_TH | 38.1 ppb |
| 2018-05-02 | AG63141_TH | 28.3 ppb |
| 2018-05-02 | AG63142_TH | 16.1 ppb |
| 2018-08-01 | AG74122_TH | 71.3 ppb |
| 2018-08-01 | AG74123_TH | 60.5 ppb |
| 2018-08-01 | AG74124_TH | 56.8 ppb |
| 2018-08-01 | AG74125_TH | 56.8 ppb |
| 2018-08-01 | AG74153_TH | 56.7 ppb |
| 2018-08-01 | AG74154_TH | 60.8 ppb |
| 2018-08-01 | AG74189_TH | 66.2 ppb |
| 2018-08-01 | AG74190_TH | 48.1 ppb |
| 2018-08-01 | AG74191_TH | 55.5 ppb |
| 2018-08-01 | AG74192_TH | 58.7 ppb |
| 2018-08-01 | AG74193_TH | 64.4 ppb |
| 2018-08-01 | AG74194_TH | 30.0 ppb |
| 2018-11-07 | AG86518_TH | 26.3 ppb |
| 2018-11-07 | AG86519_TH | 27.9 ppb |
| 2018-11-07 | AG86553_TH | 31.6 ppb |
| 2018-11-07 | AG86554_TH | 27.4 ppb |
| 2018-11-07 | AG86555_TH | 31.9 ppb |
| 2018-11-07 | AG86556_TH | 37.5 ppb |
| 2018-11-07 | AG86557_TH | 38.9 ppb |
| 2018-11-07 | AG86558_TH | 36.6 ppb |
| 2018-11-07 | AG86559_TH | 38.9 ppb |
| 2018-11-07 | AG86560_TH | 35.7 ppb |
| 2018-11-07 | AG86561_TH | 36.7 ppb |
| 2018-11-07 | AG86562_TH | 21.9 ppb |
| 2019-02-06 | AG96672_TH | 23.0 ppb |
| 2019-02-06 | AG96673_TH | 17.2 ppb |
| 2019-02-06 | AG96675_TH | 25.2 ppb |
| 2019-02-06 | AG96676_TH | 26.7 ppb |
| 2019-02-06 | AG96677_TH | 17.7 ppb |
| 2019-02-06 | AG96678_TH | 19.2 ppb |
| 2019-02-06 | AG96679_TH | 28.5 ppb |
| 2019-02-06 | AG96680_TH | 16.3 ppb |
| 2019-02-06 | AG96681_TH | 20.7 ppb |
| 2019-02-06 | AG96693_TH | 15.2 ppb |
| 2019-02-06 | AG96694_TH | 21.9 ppb |
| 2019-02-06 | AG96695_TH | 23.6 ppb |
| 2019-05-01 | AH06364_TH | 35.8 ppb |
| 2019-05-01 | AH06365_TH | 34.3 ppb |
| 2019-05-01 | AH06366_TH | 35.8 ppb |
| 2019-05-01 | AH06367_TH | 31.5 ppb |
| 2019-05-01 | AH06368_TH | 20.5 ppb |
| 2019-05-01 | AH06398_TH | 42.8 ppb |
| 2019-05-01 | AH06399_TH | 37.7 ppb |
| 2019-05-01 | AH06400_TH | 26.6 ppb |
| 2019-05-01 | AH06401_TH | 33.7 ppb |
| 2019-05-01 | AH06407_TH | 27.4 ppb |
| 2019-05-01 | AH06409_TH | 28.2 ppb |
| 2019-05-01 | AH06410_TH | 29.5 ppb |
| 2019-05-01 | AH06429_TH | 28.5 ppb |
| 2019-05-01 | AH06430_TH | 37.8 ppb |
| 2019-05-01 | AH06431_TH | 30.2 ppb |
| 2019-05-01 | AH06432_TH | 37.0 ppb |
| 2019-08-07 | AH17851_TH | 55.3 ppb |
| 2019-08-07 | AH17852_TH | 53.2 ppb |
| 2019-08-07 | AH17853_TH | 50.3 ppb |
| 2019-08-07 | AH17854_TH | 41.9 ppb |
| 2019-08-07 | AH17857_TH | 37.3 ppb |
| 2019-08-07 | AH17858_TH | 37.8 ppb |
| 2019-08-07 | AH17859_TH | 46.2 ppb |
| 2019-08-07 | AH17904_TH | 49.4 ppb |
| 2019-08-07 | AH17905_TH | 46.3 ppb |
| 2019-08-07 | AH17906_TH | 39.3 ppb |
| 2019-08-07 | AH17907_TH | 48.6 ppb |
| 2019-08-07 | AH17908_TH | 44.3 ppb |
| 2019-08-07 | AH17909_TH | 41.2 ppb |
| 2019-08-07 | AH17910_TH | 37.7 ppb |
| 2019-08-07 | AH17911_TH | 47.5 ppb |
| 2019-08-07 | AH17912_TH | 28.6 ppb |
| 2019-11-06 | AH29903_TH | 23.5 ppb |
| 2019-11-06 | AH29904_TH | 27.3 ppb |
| 2019-11-06 | AH29905_TH | 31.4 ppb |
| 2019-11-06 | AH29906_TH | 30.5 ppb |
| 2019-11-06 | AH29909_TH | 12.5 ppb |
| 2019-11-06 | AH29910_TH | 30.5 ppb |
| 2019-11-06 | AH29911_TH | 21.4 ppb |
| 2019-11-06 | AH29912_TH | 18.1 ppb |
| 2019-11-06 | AH29913_TH | 22.7 ppb |
| 2019-11-06 | AH29915_TH | 18.6 ppb |
| 2019-11-06 | AH29916_TH | 19.5 ppb |
| 2019-11-06 | AH29917_TH | 23.4 ppb |
| 2019-11-06 | AH29933_TH | 25.8 ppb |
| 2019-11-06 | AH29934_TH | 25.7 ppb |
| 2019-11-06 | AH29935_TH | 20.0 ppb |
| 2019-11-06 | AH29936_TH | 18.1 ppb |