Chloroform
Fredonia Village
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.
Samples
Samples exceeding legal limit (MCL)
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 | 58.3 ppb | 12 | 12 | 29.0 ppb - 99.0 ppb |
| 2015 | 51.8 ppb | 16 | 16 | 20.0 ppb - 84.0 ppb |
| 2016 | 34.9 ppb | 16 | 16 | 16.0 ppb - 52.0 ppb |
| 2017 | 45.4 ppb | 16 | 16 | 23.0 ppb - 69.0 ppb |
| 2018 | 48.6 ppb | 16 | 16 | 28.0 ppb - 81.0 ppb |
| 2019 | 47.6 ppb | 16 | 16 | 18.0 ppb - 79.0 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 |
|---|---|---|
| 2014-05-29 | MAY2014 278 CHES | 29.0 ppb |
| 2014-05-29 | MAY2014 176 EAGL | 46.0 ppb |
| 2014-05-29 | MAY2014 33 TEMPL | 38.0 ppb |
| 2014-05-29 | MAY2014 GREGORY | 46.0 ppb |
| 2014-08-26 | AUG14 151CHESTNU | 99.0 ppb |
| 2014-08-26 | AUG2014 176 EAGL | 99.0 ppb |
| 2014-08-26 | AUG2014 GREGORY | 71.0 ppb |
| 2014-08-26 | 33 TEMPLE AUG 20 | 65.0 ppb |
| 2014-11-05 | NOV14 33 TEMPLE | 38.0 ppb |
| 2014-11-24 | NOV14 278 CHESTN | 60.0 ppb |
| 2014-11-24 | NOV14 176 EAGLE | 53.0 ppb |
| 2014-11-24 | NOV14 GREGORY HA | 56.0 ppb |
| 2015-02-19 | FEB15 33 TEMPLE | 20.0 ppb |
| 2015-02-19 | FEB 15 GREGORY H | 21.0 ppb |
| 2015-02-19 | FEB 15 278 CHEST | 27.0 ppb |
| 2015-02-19 | FEB15 176 EAGLE | 34.0 ppb |
| 2015-05-14 | MAY2015 TEMPLE | 43.0 ppb |
| 2015-05-14 | MAY2015 GREGORY | 49.0 ppb |
| 2015-05-14 | MAY2015 278 CHES | 51.0 ppb |
| 2015-05-14 | MAY2015 EAGLE | 56.0 ppb |
| 2015-08-13 | AUG15 GREGORY HA | 77.0 ppb |
| 2015-08-13 | AUG15 33 TEMPLE | 63.0 ppb |
| 2015-08-13 | AUG15 176 EAGLE | 75.0 ppb |
| 2015-08-13 | AUG15 278 CHESTN | 84.0 ppb |
| 2015-11-20 | NOV15 EAGLE | 61.0 ppb |
| 2015-11-20 | NOV15 278 CHESTN | 39.0 ppb |
| 2015-11-21 | NOV15 33 TEMPLE | 65.0 ppb |
| 2015-11-22 | NOV15 GREGORY HA | 63.0 ppb |
| 2016-02-29 | FEB2016 GREGORY | 23.0 ppb |
| 2016-02-29 | FEB16 33 TEMPLE | 27.0 ppb |
| 2016-02-29 | FEB2016 278 CHES | 16.0 ppb |
| 2016-02-29 | FEB16 176 EAGLE | 35.0 ppb |
| 2016-05-25 | 2NDQT16 278 CHES | 21.0 ppb |
| 2016-05-25 | 2NDQT16 176 EAGL | 48.0 ppb |
| 2016-05-25 | 2NDQT16 33 TEMPL | 44.0 ppb |
| 2016-05-25 | 2NDQT16 GREGORY | 36.0 ppb |
| 2016-08-25 | AUG16 GREGORY HA | 41.0 ppb |
| 2016-08-25 | AUG16 33 TEMPLE | 33.0 ppb |
| 2016-08-29 | AUG16 176 EAGLE | 44.0 ppb |
| 2016-08-29 | AUG16 278 CHESTN | 21.0 ppb |
| 2016-11-18 | NOV16 176 EAGLE | 52.0 ppb |
| 2016-11-18 | NOV16 278 CHESTN | 28.0 ppb |
| 2016-11-18 | NOV16 GREGORY HA | 42.0 ppb |
| 2016-11-18 | NOV16 33 TEMPLE | 48.0 ppb |
| 2017-02-21 | FEB17 176 EAGLE | 27.0 ppb |
| 2017-02-21 | FEB17 278 CHESTN | 26.0 ppb |
| 2017-02-21 | FEB17 33 TEMPLE | 29.0 ppb |
| 2017-02-21 | FEB17 GREGORY HA | 23.0 ppb |
| 2017-05-16 | MAY17 EAGLE | 49.0 ppb |
| 2017-05-16 | MAY17 CHESTNUT | 54.0 ppb |
| 2017-05-16 | MAY17 TEMPLE | 49.0 ppb |
| 2017-05-16 | MAY17 GREGORY HA | 57.0 ppb |
| 2017-08-08 | AUG17 GREGORY HA | 50.0 ppb |
| 2017-08-08 | 17AUG 33 TEMPLE | 58.0 ppb |
| 2017-08-09 | AUG17 CHESTNUT S | 48.0 ppb |
| 2017-08-09 | AUG17 EAGLE STRE | 47.0 ppb |
| 2017-11-29 | NOV17 33 TEMPLE | 51.0 ppb |
| 2017-11-29 | NOV17 EAGLE | 69.0 ppb |
| 2017-11-29 | NOV17 CHESTNUT | 44.0 ppb |
| 2017-11-29 | NOV17 GREGORY HA | 46.0 ppb |
| 2018-02-28 | Q1FREDONIA 18 TE | 37.0 ppb |
| 2018-02-28 | Q1FREDONIA 18 CH | 28.0 ppb |
| 2018-02-28 | Q1FREDONIA 18 EA | 41.0 ppb |
| 2018-02-28 | Q1FREDONIA 18 GR | 39.0 ppb |
| 2018-05-08 | Q2FREDONIA 18 CH | 35.0 ppb |
| 2018-05-09 | Q2FREDONIA 18 GR | 37.0 ppb |
| 2018-05-09 | Q2FREDONIA 18 TE | 36.0 ppb |
| 2018-05-09 | Q2FREDONIA 18 EA | 45.0 ppb |
| 2018-08-08 | Q3FREDONIA 18 CH | 62.0 ppb |
| 2018-08-08 | Q318FREDONIA 176 | 68.0 ppb |
| 2018-08-08 | Q318FREDONIA GRE | 81.0 ppb |
| 2018-08-08 | Q318FREDONIA 33 | 64.0 ppb |
| 2018-11-13 | Q418FREDONIA 33 | 63.0 ppb |
| 2018-11-13 | Q418FREDONIA GRE | 48.0 ppb |
| 2018-11-13 | Q418FREDONIA 176 | 45.0 ppb |
| 2018-11-13 | Q418 FREDONIA CH | 49.0 ppb |
| 2019-02-26 | Q119FREDONIA 176 | 27.0 ppb |
| 2019-02-26 | Q119FREDONIA GRE | 18.0 ppb |
| 2019-02-26 | Q119 FREDONIA CH | 18.0 ppb |
| 2019-02-26 | Q119FREDONIA 33 | 20.0 ppb |
| 2019-05-14 | Q219FREDONIA GRE | 32.0 ppb |
| 2019-05-14 | Q219 FREDONIA CH | 29.0 ppb |
| 2019-05-14 | Q219FREDONIA 176 | 44.0 ppb |
| 2019-05-14 | Q219FREDONIA 33 | 30.0 ppb |
| 2019-08-13 | Q319FREDONIA 176 | 59.0 ppb |
| 2019-08-13 | Q319FREDONIA CHE | 74.0 ppb |
| 2019-08-13 | Q319FREDONIA GRE | 79.0 ppb |
| 2019-08-13 | Q319FREDONIA 33 | 70.0 ppb |
| 2019-11-20 | Q419FREDONIA 176 | 67.0 ppb |
| 2019-11-20 | Q419FREDONIA CHE | 62.0 ppb |
| 2019-11-20 | Q419FREDONIA GRE | 69.0 ppb |
| 2019-11-20 | Q419FREDONIA 33 | 64.0 ppb |