Chloroform
Truckee Meadows Water Authority
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 | 21.9 ppb | 49 | 49 | 7.60 ppb - 51.0 ppb |
2015 | 30.7 ppb | 48 | 48 | 6.20 ppb - 65.0 ppb |
2016 | 33.4 ppb | 48 | 46 | ND - 66.0 ppb |
2017 | 27.1 ppb | 48 | 45 | ND - 70.0 ppb |
2018 | 20.0 ppb | 48 | 44 | ND - 40.0 ppb |
2019 | 20.2 ppb | 48 | 46 | ND - 37.8 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 |
---|---|---|
2014-02-18 | 0214-03 | 36.0 ppb |
2014-02-18 | 0214-04 | 27.0 ppb |
2014-02-18 | 0214-05 | 36.0 ppb |
2014-02-18 | 0214-06 | 41.0 ppb |
2014-02-18 | 0214-07 | 37.0 ppb |
2014-02-18 | 0214-13 | 23.0 ppb |
2014-02-18 | 0214-14 | 41.0 ppb |
2014-02-20 | 0214-08 | 26.0 ppb |
2014-02-20 | 0214-09 | 25.0 ppb |
2014-02-20 | 0214-10 | 17.0 ppb |
2014-02-20 | 0214-11 | 51.0 ppb |
2014-02-20 | 0214-12 | 22.0 ppb |
2014-05-13 | EN2014-00002284 | 13.0 ppb |
2014-05-13 | EN2014-00002285 | 23.0 ppb |
2014-05-13 | EN2014-00002286 | 29.0 ppb |
2014-05-13 | EN2014-00002287 | 30.0 ppb |
2014-05-13 | EN2014-00002288 | 23.0 ppb |
2014-05-13 | EN2014-00002289 | 16.0 ppb |
2014-05-13 | EN2014-00002290 | 21.0 ppb |
2014-05-13 | EN2014-00002291 | 32.0 ppb |
2014-05-13 | EN2014-00002292 | 39.0 ppb |
2014-05-13 | EN2014-00002293 | 20.0 ppb |
2014-05-13 | EN2014-00002294 | 16.0 ppb |
2014-05-13 | EN2014-00002295 | 23.0 ppb |
2014-08-12 | EN2014-00004047 | 12.0 ppb |
2014-08-12 | EN2014-00004048 | 16.0 ppb |
2014-08-12 | EN2014-00004049 | 11.0 ppb |
2014-08-12 | EN2014-00004050 | 14.0 ppb |
2014-08-12 | EN2014-00004051 | 21.0 ppb |
2014-08-12 | EN2014-00004052 | 19.0 ppb |
2014-08-12 | EN2014-00004053 | 16.0 ppb |
2014-08-12 | EN2014-00004054 | 10.00 ppb |
2014-08-12 | EN2014-00004055 | 18.0 ppb |
2014-08-12 | EN2014-00004056 | 10.00 ppb |
2014-08-12 | EN2014-00004057 | 15.0 ppb |
2014-08-12 | EN2014-00004058 | 13.0 ppb |
2014-08-19 | EN2014-00004257 | 21.0 ppb |
2014-11-12 | EN2014-00006287 | 17.0 ppb |
2014-11-12 | EN2014-00006288 | 7.60 ppb |
2014-11-12 | EN2014-00006289 | 28.0 ppb |
2014-11-12 | EN2014-00006290 | 25.0 ppb |
2014-11-12 | EN2014-00006291 | 18.0 ppb |
2014-11-12 | EN2014-00006292 | 18.0 ppb |
2014-11-12 | EN2014-00006293 | 22.0 ppb |
2014-11-12 | EN2014-00006294 | 22.0 ppb |
2014-11-12 | EN2014-00006295 | 8.80 ppb |
2014-11-12 | EN2014-00006296 | 8.20 ppb |
2014-11-12 | EN2014-00006297 | 13.0 ppb |
2014-11-12 | EN2014-00006298 | 22.0 ppb |
2015-02-17 | 1502002-01 | 35.0 ppb |
2015-02-17 | 1502002-02 | 13.0 ppb |
2015-02-17 | 1502002-03 | 40.0 ppb |
2015-02-17 | 1502002-04 | 40.0 ppb |
2015-02-17 | 1502002-05 | 21.0 ppb |
2015-02-17 | 1502002-06 | 35.0 ppb |
2015-02-17 | 1502002-07 | 28.0 ppb |
2015-02-17 | 1502002-08 | 43.0 ppb |
2015-02-17 | 1502002-09 | 53.0 ppb |
2015-02-17 | 1502002-10 | 48.0 ppb |
2015-02-17 | 1502002-11 | 28.0 ppb |
2015-02-17 | 1502002-12 | 65.0 ppb |
2015-05-19 | 1505022-01 | 30.0 ppb |
2015-05-19 | 1505022-02 | 9.30 ppb |
2015-05-19 | 1505022-03 | 30.0 ppb |
2015-05-19 | 1505022-04 | 30.0 ppb |
2015-05-19 | 1505022-05 | 27.0 ppb |
2015-05-19 | 1505022-06 | 28.0 ppb |
2015-05-19 | 1505022-07 | 33.0 ppb |
2015-05-19 | 1505022-08 | 39.0 ppb |
2015-05-19 | 1505022-09 | 30.0 ppb |
2015-05-19 | 1505022-10 | 39.0 ppb |
2015-05-19 | 1505022-11 | 12.0 ppb |
2015-05-19 | 1505022-12 | 27.0 ppb |
2015-08-17 | 1508038-01 | 25.0 ppb |
2015-08-17 | 1508038-02 | 18.0 ppb |
2015-08-17 | 1508038-03 | 36.0 ppb |
2015-08-17 | 1508038-04 | 42.0 ppb |
2015-08-17 | 1508038-05 | 41.0 ppb |
2015-08-17 | 1508038-06 | 30.0 ppb |
2015-08-17 | 1508038-07 | 26.0 ppb |
2015-08-17 | 1508038-08 | 30.0 ppb |
2015-08-17 | 1508038-09 | 30.0 ppb |
2015-08-17 | 1508038-10 | 12.0 ppb |
2015-08-17 | 1508038-11 | 16.0 ppb |
2015-08-17 | 1508038-12 | 20.0 ppb |
2015-11-09 | 1511013-01EUR | 37.0 ppb |
2015-11-09 | 1511013-02EUR | 13.0 ppb |
2015-11-09 | 1511013-03EUR | 56.0 ppb |
2015-11-09 | 1511013-04EUR | 45.0 ppb |
2015-11-09 | 1511013-05EUR | 38.0 ppb |
2015-11-09 | 1511013-06EUR | 35.0 ppb |
2015-11-09 | 1511013-07EUR | 18.0 ppb |
2015-11-09 | 1511013-08EUR | 42.0 ppb |
2015-11-09 | 1511013-09NSHL | 9.00 ppb |
2015-11-09 | 1511013-10NSHL | 6.20 ppb |
2015-11-09 | 1511013-11NSHL | 20.0 ppb |
2015-11-09 | 1511013-12NSHL | 43.0 ppb |
2016-02-09 | 1602009-01EUR | 33.0 ppb |
2016-02-09 | 1602009-02EUR | 14.0 ppb |
2016-02-09 | 1602009-03EUR | 41.0 ppb |
2016-02-09 | 1602009-04EUR | 41.0 ppb |
2016-02-09 | 1602009-05EUR | 27.0 ppb |
2016-02-09 | 1602009-06EUR | 18.0 ppb |
2016-02-09 | 1602009-07EUR | 28.0 ppb |
2016-02-09 | 1602009-08EUR | 26.0 ppb |
2016-02-09 | 1602009-09EUR | 35.0 ppb |
2016-02-09 | 1602009-10EUR | 35.0 ppb |
2016-02-09 | 1602009-11EUR | 13.0 ppb |
2016-02-09 | 1602009-12EUR | 52.0 ppb |
2016-05-09 | 1605007-01EUR | 24.0 ppb |
2016-05-09 | 1605007-02EUR | 13.0 ppb |
2016-05-09 | 1605007-03EUR | 35.0 ppb |
2016-05-09 | 1605007-04EUR | 38.0 ppb |
2016-05-09 | 1605007-05EUR | 31.0 ppb |
2016-05-09 | 1605007-06EUR | 32.0 ppb |
2016-05-09 | 1605007-07EUR | 33.0 ppb |
2016-05-09 | 1605007-08EUR | 42.0 ppb |
2016-05-09 | 1605007-09EUR | 48.0 ppb |
2016-05-09 | 1605007-10EUR | 42.0 ppb |
2016-05-09 | 1605007-11EUR | 20.0 ppb |
2016-05-09 | 1605007-12EUR | 37.0 ppb |
2016-08-09 | 1608020-01EUR | 58.0 ppb |
2016-08-09 | 1608020-02EUR | 32.0 ppb |
2016-08-09 | 1608020-03EUR | 36.0 ppb |
2016-08-09 | 1608020-04EUR | 50.0 ppb |
2016-08-09 | 1608020-05EUR | 22.0 ppb |
2016-08-09 | 1608020-07EUR | 19.0 ppb |
2016-08-09 | 1608020-08EUR | 35.0 ppb |
2016-08-09 | 1608020-09EUR | 39.0 ppb |
2016-08-09 | 1608020-10EUR | 17.0 ppb |
2016-08-09 | 1608020-11EUR | 26.0 ppb |
2016-08-09 | 1608020-12EUR | ND |
2016-08-09 | 1608020-06NSHL | 24.0 ppb |
2016-11-08 | 1611004-01EUR | 59.0 ppb |
2016-11-08 | 1611004-02EUR | 66.0 ppb |
2016-11-08 | 1611004-03EUR | 18.0 ppb |
2016-11-08 | 1611004-04EUR | 66.0 ppb |
2016-11-08 | 1611004-05EUR | 22.0 ppb |
2016-11-08 | 1611004-06EUR | 54.0 ppb |
2016-11-08 | 1611004-07EUR | 28.0 ppb |
2016-11-08 | 1611004-08EUR | 48.0 ppb |
2016-11-08 | 1611004-09EUR | 51.0 ppb |
2016-11-08 | 1611004-10EUR | 23.0 ppb |
2016-11-08 | 1611004-11EUR | 52.0 ppb |
2016-11-08 | 1611004-12EUR | ND |
2017-02-07 | 1702003-01EUR | 43.0 ppb |
2017-02-07 | 1702003-02EUR | 46.0 ppb |
2017-02-07 | 1702003-03EUR | 42.0 ppb |
2017-02-07 | 1702003-04EUR | 70.0 ppb |
2017-02-07 | 1702003-05EUR | 41.0 ppb |
2017-02-07 | 1702003-06EUR | 44.0 ppb |
2017-02-07 | 1702003-07EUR | 34.0 ppb |
2017-02-07 | 1702003-08EUR | 40.0 ppb |
2017-02-07 | 1702003-09EUR | 30.0 ppb |
2017-02-07 | 1702003-10EUR | 41.0 ppb |
2017-02-07 | 1702003-11EUR | 39.0 ppb |
2017-02-07 | 1702003-12EUR | ND |
2017-05-09 | 1705019-01EUR | 31.0 ppb |
2017-05-09 | 1705019-02EUR | 18.0 ppb |
2017-05-09 | 1705019-03EUR | 26.0 ppb |
2017-05-09 | 1705019-04EUR | 32.0 ppb |
2017-05-09 | 1705019-05EUR | 24.0 ppb |
2017-05-09 | 1705019-06EUR | 34.0 ppb |
2017-05-09 | 1705019-08EUR | 26.0 ppb |
2017-05-09 | 1705019-09EUR | 24.0 ppb |
2017-05-09 | 1705019-10EUR | 34.0 ppb |
2017-05-09 | 1705019-11EUR | 21.0 ppb |
2017-05-09 | 1705019-12EUR | 4.10 ppb |
2017-05-09 | 1705019-07NSHL | 8.50 ppb |
2017-08-09 | 1708009-01EUR | 39.0 ppb |
2017-08-09 | 1708009-02EUR | 24.0 ppb |
2017-08-09 | 1708009-03EUR | 34.0 ppb |
2017-08-09 | 1708009-04EUR | 35.0 ppb |
2017-08-09 | 1708009-05EUR | 14.0 ppb |
2017-08-09 | 1708009-06EUR | 18.0 ppb |
2017-08-09 | 1708009-07EUR | 15.0 ppb |
2017-08-09 | 1708009-08EUR | 41.0 ppb |
2017-08-09 | 1708009-09EUR | 31.0 ppb |
2017-08-09 | 1708009-10EUR | 29.0 ppb |
2017-08-09 | 1708009-11EUR | 8.60 ppb |
2017-08-09 | 1708009-12EUR | ND |
2017-11-07 | 1711020-01EUR | 43.0 ppb |
2017-11-07 | 1711020-02EUR | 14.0 ppb |
2017-11-07 | 1711020-03EUR | 28.0 ppb |
2017-11-07 | 1711020-04EUR | 39.0 ppb |
2017-11-07 | 1711020-05EUR | 33.0 ppb |
2017-11-07 | 1711020-06EUR | 11.0 ppb |
2017-11-07 | 1711020-07EUR | 13.0 ppb |
2017-11-07 | 1711020-08EUR | 20.0 ppb |
2017-11-07 | 1711020-09EUR | 21.0 ppb |
2017-11-07 | 1711020-10EUR | 21.0 ppb |
2017-11-07 | 1711020-11EUR | 17.0 ppb |
2017-11-07 | 1711020-12EUR | ND |
2018-02-13 | 1802014-01 | 25.2 ppb |
2018-02-13 | 1802014-02 | 23.1 ppb |
2018-02-13 | 1802014-03 | 25.2 ppb |
2018-02-13 | 1802014-04 | 29.9 ppb |
2018-02-13 | 1802014-05 | 22.4 ppb |
2018-02-13 | 1802014-06 | ND |
2018-02-13 | 1802014-07 | 29.2 ppb |
2018-02-13 | 1802014-08 | 24.0 ppb |
2018-02-13 | 1802014-09 | 23.5 ppb |
2018-02-13 | 1802014-10 | ND |
2018-02-13 | 1802014-11 | 11.4 ppb |
2018-02-13 | 1802014-12 | 24.6 ppb |
2018-05-08 | 1805023-01 | 17.2 ppb |
2018-05-08 | 1805023-02 | 19.6 ppb |
2018-05-08 | 1805023-03 | 12.0 ppb |
2018-05-08 | 1805023-04 | 20.4 ppb |
2018-05-08 | 1805023-05 | 25.4 ppb |
2018-05-08 | 1805023-06 | ND |
2018-05-08 | 1805023-07 | 21.8 ppb |
2018-05-08 | 1805023-08 | 21.4 ppb |
2018-05-08 | 1805023-09 | 16.9 ppb |
2018-05-08 | 1805023-10 | 8.80 ppb |
2018-05-08 | 1805023-11 | 20.2 ppb |
2018-05-08 | 1805023-12 | 19.7 ppb |
2018-08-08 | 1808014-01 | 35.2 ppb |
2018-08-08 | 1808014-02 | 16.9 ppb |
2018-08-08 | 1808014-03 | 17.4 ppb |
2018-08-08 | 1808014-04 | 25.7 ppb |
2018-08-08 | 1808014-05 | 9.90 ppb |
2018-08-08 | 1808014-06 | 8.20 ppb |
2018-08-08 | 1808014-07 | 11.5 ppb |
2018-08-08 | 1808014-08 | 23.3 ppb |
2018-08-08 | 1808014-09 | 20.4 ppb |
2018-08-08 | 1808014-10 | 12.3 ppb |
2018-08-08 | 1808014-11 | 6.70 ppb |
2018-08-08 | 1808014-12 | ND |
2018-11-15 | 1811013-01WET | 14.0 ppb |
2018-11-15 | 1811013-02WET | 35.0 ppb |
2018-11-15 | 1811013-03WET | 37.0 ppb |
2018-11-15 | 1811013-04WET | 22.0 ppb |
2018-11-15 | 1811013-05WET | 35.0 ppb |
2018-11-15 | 1811013-06WET | 34.0 ppb |
2018-11-15 | 1811013-07WET | 34.0 ppb |
2018-11-15 | 1811013-08WET | 13.0 ppb |
2018-11-15 | 1811013-09WET | 15.0 ppb |
2018-11-15 | 1811013-10WET | 40.0 ppb |
2018-11-15 | 1811013-11WET | 11.0 ppb |
2018-11-15 | 1811013-12WET | 39.0 ppb |
2019-02-12 | 1902014-01 | 26.2 ppb |
2019-02-12 | 1902014-02 | 24.7 ppb |
2019-02-12 | 1902014-03 | 27.2 ppb |
2019-02-12 | 1902014-04 | 16.3 ppb |
2019-02-12 | 1902014-05 | 12.6 ppb |
2019-02-12 | 1902014-06 | 0.710 ppb |
2019-02-12 | 1902014-07 | 33.1 ppb |
2019-02-12 | 1902014-08 | 14.8 ppb |
2019-02-12 | 1902014-09 | 24.1 ppb |
2019-02-12 | 1902014-10 | 33.1 ppb |
2019-02-12 | 1902014-11 | 23.0 ppb |
2019-02-12 | 1902014-12 | 26.4 ppb |
2019-05-08 | 1905009-01 | 24.3 ppb |
2019-05-08 | 1905009-02 | 19.4 ppb |
2019-05-08 | 1905009-03 | 24.8 ppb |
2019-05-08 | 1905009-04 | 23.5 ppb |
2019-05-08 | 1905009-05 | 2.42 ppb |
2019-05-08 | 1905009-06 | ND |
2019-05-08 | 1905009-07 | 30.9 ppb |
2019-05-08 | 1905009-08 | 20.4 ppb |
2019-05-08 | 1905009-09 | 27.1 ppb |
2019-05-08 | 1905009-10 | 11.0 ppb |
2019-05-08 | 1905009-11 | 24.1 ppb |
2019-05-08 | 1905009-12 | 31.2 ppb |
2019-08-21 | 1908012-01 | 14.9 ppb |
2019-08-21 | 1908012-02 | 18.6 ppb |
2019-08-21 | 1908012-03 | 13.0 ppb |
2019-08-21 | 1908012-04 | 24.8 ppb |
2019-08-21 | 1908012-05 | 28.2 ppb |
2019-08-21 | 1908012-06 | ND |
2019-08-21 | 1908012-07 | 23.7 ppb |
2019-08-21 | 1908012-08 | 14.2 ppb |
2019-08-21 | 1908012-09 | 16.9 ppb |
2019-08-21 | 1908012-10 | 0.510 ppb |
2019-08-21 | 1908012-11 | 15.0 ppb |
2019-08-21 | 1908012-12 | 24.6 ppb |
2019-11-04 | 1911002-01 | 11.8 ppb |
2019-11-04 | 1911002-02 | 25.9 ppb |
2019-11-04 | 1911002-03 | 36.4 ppb |
2019-11-04 | 1911002-04 | 21.0 ppb |
2019-11-04 | 1911002-05 | 3.27 ppb |
2019-11-04 | 1911002-06 | 21.4 ppb |
2019-11-04 | 1911002-07 | 27.7 ppb |
2019-11-04 | 1911002-08 | 15.0 ppb |
2019-11-04 | 1911002-09 | 13.5 ppb |
2019-11-04 | 1911002-10 | 35.6 ppb |
2019-11-04 | 1911002-11 | 26.3 ppb |
2019-11-04 | 1911002-12 | 37.8 ppb |