Chloroform
Shreveport Water System
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 |
|---|---|---|---|---|
| 2018 | 34.0 ppb | 64 | 64 | 12.7 ppb - 57.3 ppb |
| 2019 | 62.4 ppb | 100 | 100 | 23.1 ppb - 178.0 ppb |
| 2020 | 26.4 ppb | 32 | 32 | 18.6 ppb - 33.3 ppb |
| 2021 | 25.7 ppb | 32 | 32 | 8.20 ppb - 46.1 ppb |
| 2022 | 26.9 ppb | 33 | 33 | 14.1 ppb - 41.4 ppb |
| 2023 | 57.5 ppb | 32 | 32 | 7.80 ppb - 133.0 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.4 ppb
The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-27 | 35382527001 | 40.0 ppb |
| 2018-03-27 | 35382527002 | 37.9 ppb |
| 2018-03-27 | 35382527003 | 40.6 ppb |
| 2018-03-27 | 35382527004 | 42.4 ppb |
| 2018-03-27 | 35382527005 | 41.3 ppb |
| 2018-03-27 | 35382527006 | 40.6 ppb |
| 2018-03-27 | 35382527007 | 38.0 ppb |
| 2018-03-27 | 35382527008 | 56.9 ppb |
| 2018-03-27 | 35382527001 | 40.0 ppb |
| 2018-03-27 | 35382527002 | 37.9 ppb |
| 2018-03-27 | 35382527003 | 40.6 ppb |
| 2018-03-27 | 35382527004 | 42.4 ppb |
| 2018-03-27 | 35382527005 | 41.3 ppb |
| 2018-03-27 | 35382527006 | 40.6 ppb |
| 2018-03-27 | 35382527007 | 38.0 ppb |
| 2018-03-27 | 35382527008 | 56.9 ppb |
| 2018-06-07 | 35397229001 | 34.2 ppb |
| 2018-06-07 | 35397229002 | 46.0 ppb |
| 2018-06-07 | 35397229003 | 39.9 ppb |
| 2018-06-07 | 35397229004 | 39.7 ppb |
| 2018-06-07 | 35397229005 | 37.9 ppb |
| 2018-06-07 | 35397229006 | 39.5 ppb |
| 2018-06-07 | 35397229007 | 57.3 ppb |
| 2018-06-07 | 35397229008 | 34.7 ppb |
| 2018-06-07 | 35397229001 | 34.2 ppb |
| 2018-06-07 | 35397229002 | 46.0 ppb |
| 2018-06-07 | 35397229003 | 39.9 ppb |
| 2018-06-07 | 35397229004 | 39.7 ppb |
| 2018-06-07 | 35397229005 | 37.9 ppb |
| 2018-06-07 | 35397229006 | 39.5 ppb |
| 2018-06-07 | 35397229007 | 57.3 ppb |
| 2018-06-07 | 35397229008 | 34.7 ppb |
| 2018-09-13 | 35417895001 | 17.4 ppb |
| 2018-09-13 | 35417895002 | 12.7 ppb |
| 2018-09-13 | 35417895003 | 15.2 ppb |
| 2018-09-13 | 35417895004 | 23.1 ppb |
| 2018-09-13 | 35417895005 | 19.6 ppb |
| 2018-09-13 | 35417895006 | 13.6 ppb |
| 2018-09-13 | 35417895007 | 13.0 ppb |
| 2018-09-13 | 35417895008 | 22.7 ppb |
| 2018-09-13 | 35417895001 | 17.4 ppb |
| 2018-09-13 | 35417895002 | 12.7 ppb |
| 2018-09-13 | 35417895003 | 15.2 ppb |
| 2018-09-13 | 35417895004 | 23.1 ppb |
| 2018-09-13 | 35417895005 | 19.6 ppb |
| 2018-09-13 | 35417895006 | 13.6 ppb |
| 2018-09-13 | 35417895007 | 13.0 ppb |
| 2018-09-13 | 35417895008 | 22.7 ppb |
| 2018-12-05 | 35435846001 | 37.8 ppb |
| 2018-12-05 | 35435846002 | 37.1 ppb |
| 2018-12-05 | 35435846003 | 38.6 ppb |
| 2018-12-05 | 35435846004 | 37.8 ppb |
| 2018-12-05 | 35435846005 | 39.2 ppb |
| 2018-12-05 | 35435846006 | 33.5 ppb |
| 2018-12-05 | 35435846007 | 37.7 ppb |
| 2018-12-05 | 35435846008 | 22.2 ppb |
| 2018-12-05 | 35435846001 | 37.8 ppb |
| 2018-12-05 | 35435846002 | 37.1 ppb |
| 2018-12-05 | 35435846003 | 38.6 ppb |
| 2018-12-05 | 35435846004 | 37.8 ppb |
| 2018-12-05 | 35435846005 | 39.2 ppb |
| 2018-12-05 | 35435846006 | 33.5 ppb |
| 2018-12-05 | 35435846007 | 37.7 ppb |
| 2018-12-05 | 35435846008 | 22.2 ppb |
| 2019-03-01 | 35451814001 | 28.8 ppb |
| 2019-03-01 | 35451814002 | 31.0 ppb |
| 2019-03-01 | 35451814003 | 31.6 ppb |
| 2019-03-01 | 35451814004 | 40.1 ppb |
| 2019-03-01 | 35451814005 | 31.0 ppb |
| 2019-03-01 | 35451814006 | 33.2 ppb |
| 2019-03-01 | 35451814007 | 28.3 ppb |
| 2019-03-01 | 35451814008 | 57.0 ppb |
| 2019-03-01 | 35451814001 | 28.8 ppb |
| 2019-03-01 | 35451814002 | 31.0 ppb |
| 2019-03-01 | 35451814003 | 31.6 ppb |
| 2019-03-01 | 35451814004 | 40.1 ppb |
| 2019-03-01 | 35451814005 | 31.0 ppb |
| 2019-03-01 | 35451814006 | 33.2 ppb |
| 2019-03-01 | 35451814007 | 28.3 ppb |
| 2019-03-01 | 35451814008 | 57.0 ppb |
| 2019-03-22 | 35457044001 | 50.6 ppb |
| 2019-03-22 | 35457044002 | 50.3 ppb |
| 2019-03-22 | 35457044001 | 50.6 ppb |
| 2019-03-22 | 35457044002 | 50.3 ppb |
| 2019-06-13 | 35475662001 | 51.5 ppb |
| 2019-06-13 | 35475662002 | 58.5 ppb |
| 2019-06-13 | 35475662003 | 63.1 ppb |
| 2019-06-13 | 35475662004 | 52.1 ppb |
| 2019-06-13 | 35475662005 | 54.5 ppb |
| 2019-06-13 | 35475662006 | 84.4 ppb |
| 2019-06-13 | 35475662007 | 99.5 ppb |
| 2019-06-13 | 35475662008 | 61.3 ppb |
| 2019-06-13 | 35475662001 | 51.5 ppb |
| 2019-06-13 | 35475662002 | 58.5 ppb |
| 2019-06-13 | 35475662003 | 63.1 ppb |
| 2019-06-13 | 35475662004 | 52.1 ppb |
| 2019-06-13 | 35475662005 | 54.5 ppb |
| 2019-06-13 | 35475662006 | 84.4 ppb |
| 2019-06-13 | 35475662007 | 99.5 ppb |
| 2019-06-13 | 35475662008 | 61.3 ppb |
| 2019-07-02 | 35479704001 | 59.9 ppb |
| 2019-07-02 | 35479704002 | 69.8 ppb |
| 2019-07-02 | 35479704003 | 67.2 ppb |
| 2019-07-02 | 35479704004 | 67.9 ppb |
| 2019-07-02 | 35479704005 | 63.3 ppb |
| 2019-07-02 | 35479704006 | 69.7 ppb |
| 2019-07-02 | 35479704007 | 69.3 ppb |
| 2019-07-02 | 35479704008 | 62.5 ppb |
| 2019-07-02 | 35479704001 | 59.9 ppb |
| 2019-07-02 | 35479704002 | 69.8 ppb |
| 2019-07-02 | 35479704003 | 67.2 ppb |
| 2019-07-02 | 35479704004 | 67.9 ppb |
| 2019-07-02 | 35479704005 | 63.3 ppb |
| 2019-07-02 | 35479704006 | 69.7 ppb |
| 2019-07-02 | 35479704007 | 69.3 ppb |
| 2019-07-02 | 35479704008 | 62.5 ppb |
| 2019-09-11 | 35497308001 | 101.0 ppb |
| 2019-09-11 | 35497308002 | 87.4 ppb |
| 2019-09-11 | 35497308003 | 136.0 ppb |
| 2019-09-11 | 35497308004 | 123.0 ppb |
| 2019-09-11 | 35497308005 | 140.0 ppb |
| 2019-09-11 | 35497308006 | 62.4 ppb |
| 2019-09-11 | 35497308007 | 60.9 ppb |
| 2019-09-11 | 35497308008 | 178.0 ppb |
| 2019-09-11 | 35497308001 | 101.0 ppb |
| 2019-09-11 | 35497308002 | 87.4 ppb |
| 2019-09-11 | 35497308003 | 136.0 ppb |
| 2019-09-11 | 35497308004 | 123.0 ppb |
| 2019-09-11 | 35497308005 | 140.0 ppb |
| 2019-09-11 | 35497308006 | 62.4 ppb |
| 2019-09-11 | 35497308007 | 60.9 ppb |
| 2019-09-11 | 35497308008 | 178.0 ppb |
| 2019-09-27 | 35501135001 | 74.1 ppb |
| 2019-09-27 | 35501135002 | 68.8 ppb |
| 2019-09-27 | 35501135003 | 75.9 ppb |
| 2019-09-27 | 35501135004 | 83.1 ppb |
| 2019-09-27 | 35501135005 | 77.3 ppb |
| 2019-09-27 | 35501135006 | 69.9 ppb |
| 2019-09-27 | 35501135007 | 67.7 ppb |
| 2019-09-27 | 35501135008 | 76.7 ppb |
| 2019-09-27 | 35501135001 | 74.1 ppb |
| 2019-09-27 | 35501135002 | 68.8 ppb |
| 2019-09-27 | 35501135003 | 75.9 ppb |
| 2019-09-27 | 35501135004 | 83.1 ppb |
| 2019-09-27 | 35501135005 | 77.3 ppb |
| 2019-09-27 | 35501135006 | 69.9 ppb |
| 2019-09-27 | 35501135007 | 67.7 ppb |
| 2019-09-27 | 35501135008 | 76.7 ppb |
| 2019-12-03 | 35516630001 | 23.1 ppb |
| 2019-12-03 | 35516630002 | 26.3 ppb |
| 2019-12-03 | 35516630003 | 25.6 ppb |
| 2019-12-03 | 35516630004 | 25.7 ppb |
| 2019-12-03 | 35516630005 | 26.2 ppb |
| 2019-12-03 | 35516630006 | 25.4 ppb |
| 2019-12-03 | 35516630007 | 24.5 ppb |
| 2019-12-03 | 35516630008 | 24.6 ppb |
| 2019-12-03 | 35516630001 | 23.1 ppb |
| 2019-12-03 | 35516630002 | 26.3 ppb |
| 2019-12-03 | 35516630003 | 25.6 ppb |
| 2019-12-03 | 35516630004 | 25.7 ppb |
| 2019-12-03 | 35516630005 | 26.2 ppb |
| 2019-12-03 | 35516630006 | 25.4 ppb |
| 2019-12-03 | 35516630007 | 24.5 ppb |
| 2019-12-03 | 35516630008 | 24.6 ppb |
| 2020-03-05 | 35535607001 | 23.6 ppb |
| 2020-03-05 | 35535607002 | 23.7 ppb |
| 2020-03-05 | 35535607003 | 19.3 ppb |
| 2020-03-05 | 35535607004 | 18.6 ppb |
| 2020-03-05 | 35535607005 | 19.4 ppb |
| 2020-03-05 | 35535607006 | 21.4 ppb |
| 2020-03-05 | 35535607007 | 20.9 ppb |
| 2020-03-05 | 35535607008 | 33.3 ppb |
| 2020-06-19 | 35557881001 | 25.2 ppb |
| 2020-06-19 | 35557881002 | 27.8 ppb |
| 2020-06-19 | 35557881003 | 25.9 ppb |
| 2020-06-19 | 35557881004 | 25.1 ppb |
| 2020-06-19 | 35557881005 | 23.8 ppb |
| 2020-06-19 | 35557881006 | 24.0 ppb |
| 2020-06-19 | 35557881007 | 24.9 ppb |
| 2020-06-19 | 35557881008 | 31.0 ppb |
| 2020-09-18 | 35578994001 | 28.7 ppb |
| 2020-09-18 | 35578994002 | 25.3 ppb |
| 2020-09-18 | 35578994003 | 27.5 ppb |
| 2020-09-18 | 35578994004 | 21.8 ppb |
| 2020-09-18 | 35578994005 | 23.5 ppb |
| 2020-09-18 | 35578994006 | 24.9 ppb |
| 2020-09-18 | 35578994007 | 28.2 ppb |
| 2020-09-18 | 35578994008 | 32.6 ppb |
| 2020-12-10 | 35598373001 | 29.6 ppb |
| 2020-12-10 | 35598373002 | 31.8 ppb |
| 2020-12-10 | 35598373003 | 30.2 ppb |
| 2020-12-10 | 35598373004 | 30.1 ppb |
| 2020-12-10 | 35598373005 | 30.8 ppb |
| 2020-12-10 | 35598373006 | 30.8 ppb |
| 2020-12-10 | 35598373007 | 32.2 ppb |
| 2020-12-10 | 35598373008 | 28.9 ppb |
| 2021-03-12 | 35618927001 | 31.9 ppb |
| 2021-03-12 | 35618927002 | 40.5 ppb |
| 2021-03-12 | 35618927003 | 34.7 ppb |
| 2021-03-12 | 35618927004 | 34.1 ppb |
| 2021-03-12 | 35618927005 | 33.9 ppb |
| 2021-03-12 | 35618927006 | 43.7 ppb |
| 2021-03-12 | 35618927007 | 46.1 ppb |
| 2021-03-12 | 35618927008 | 37.4 ppb |
| 2021-06-24 | 35643518001 | 25.0 ppb |
| 2021-06-24 | 35643518002 | 41.1 ppb |
| 2021-06-24 | 35643518003 | 42.7 ppb |
| 2021-06-24 | 35643518004 | 42.1 ppb |
| 2021-06-24 | 35643518005 | 42.7 ppb |
| 2021-06-24 | 35643518006 | 45.9 ppb |
| 2021-06-24 | 35643518007 | 32.5 ppb |
| 2021-06-24 | 35643518008 | 43.9 ppb |
| 2021-09-29 | 35668338001 | 14.3 ppb |
| 2021-09-29 | 35668338002 | 14.7 ppb |
| 2021-09-29 | 35668338003 | 13.1 ppb |
| 2021-09-29 | 35668338004 | 12.8 ppb |
| 2021-09-29 | 35668338005 | 13.5 ppb |
| 2021-09-29 | 35668338006 | 13.1 ppb |
| 2021-09-29 | 35668338007 | 12.2 ppb |
| 2021-09-29 | 35668338008 | 20.7 ppb |
| 2021-12-21 | 35686344001 | 11.6 ppb |
| 2021-12-21 | 35686344002 | 8.20 ppb |
| 2021-12-21 | 35686344003 | 10.5 ppb |
| 2021-12-21 | 35686344004 | 11.1 ppb |
| 2021-12-21 | 35686344005 | 12.2 ppb |
| 2021-12-21 | 35686344006 | 11.7 ppb |
| 2021-12-21 | 35686344007 | 10.1 ppb |
| 2021-12-21 | 35686344008 | 13.4 ppb |
| 2022-03-28 | 35706866001 | 14.1 ppb |
| 2022-03-28 | 35706866002 | 19.6 ppb |
| 2022-03-28 | 35706866003 | 15.5 ppb |
| 2022-03-28 | 35706866004 | 20.3 ppb |
| 2022-03-28 | 35706866005 | 15.8 ppb |
| 2022-03-28 | 35706866006 | 15.2 ppb |
| 2022-03-28 | 35706866007 | 17.1 ppb |
| 2022-03-28 | 35706866008 | 18.5 ppb |
| 2022-06-14 | 35725215001 | 28.8 ppb |
| 2022-06-14 | 35725215002 | 41.4 ppb |
| 2022-06-14 | 35725215003 | 40.7 ppb |
| 2022-06-14 | 35725215004 | 32.7 ppb |
| 2022-06-14 | 35725215005 | 36.9 ppb |
| 2022-06-14 | 35725215006 | 37.6 ppb |
| 2022-06-14 | 35725215007 | 40.8 ppb |
| 2022-06-14 | 35725215008 | 28.8 ppb |
| 2022-06-20 | 35726243001 | 29.4 ppb |
| 2022-09-06 | 35744728001 | 25.7 ppb |
| 2022-09-06 | 35744728002 | 28.4 ppb |
| 2022-09-06 | 35744728003 | 27.1 ppb |
| 2022-09-06 | 35744728004 | 21.4 ppb |
| 2022-09-06 | 35744728005 | 32.1 ppb |
| 2022-09-06 | 35744728006 | 28.4 ppb |
| 2022-09-06 | 35744728007 | 25.1 ppb |
| 2022-09-06 | 35744728008 | 23.9 ppb |
| 2022-12-12 | 35766141001 | 23.9 ppb |
| 2022-12-12 | 35766141002 | 32.5 ppb |
| 2022-12-12 | 35766141003 | 25.7 ppb |
| 2022-12-12 | 35766141004 | 26.6 ppb |
| 2022-12-12 | 35766141005 | 26.1 ppb |
| 2022-12-12 | 35766141006 | 29.1 ppb |
| 2022-12-12 | 35766141007 | 30.9 ppb |
| 2022-12-12 | 35766141008 | 27.1 ppb |
| 2023-03-21 | 35787436001 | 76.2 ppb |
| 2023-03-21 | 35787436002 | 83.9 ppb |
| 2023-03-21 | 35787436003 | 104.0 ppb |
| 2023-03-21 | 35787436004 | 93.1 ppb |
| 2023-03-21 | 35787436005 | 87.7 ppb |
| 2023-03-21 | 35787436006 | 86.7 ppb |
| 2023-03-21 | 35787436007 | 82.3 ppb |
| 2023-03-21 | 35787436008 | 51.2 ppb |
| 2023-06-28 | 35809787001 | 57.9 ppb |
| 2023-06-28 | 35809787002 | 81.5 ppb |
| 2023-06-28 | 35809787003 | 78.7 ppb |
| 2023-06-28 | 35809787004 | 81.8 ppb |
| 2023-06-28 | 35809787005 | 133.0 ppb |
| 2023-06-28 | 35809787006 | 97.0 ppb |
| 2023-06-28 | 35809787007 | 77.7 ppb |
| 2023-06-28 | 35809787008 | 102.0 ppb |
| 2023-09-19 | 35829295001 | 82.2 ppb |
| 2023-09-19 | 35829295002 | 47.5 ppb |
| 2023-09-19 | 35829295003 | 44.3 ppb |
| 2023-09-19 | 35829295004 | 43.0 ppb |
| 2023-09-19 | 35829295005 | 37.0 ppb |
| 2023-09-19 | 35829295006 | 42.1 ppb |
| 2023-09-19 | 35829295007 | 50.3 ppb |
| 2023-09-19 | 35829295008 | 44.0 ppb |
| 2023-12-19 | 35849361001 | 7.90 ppb |
| 2023-12-19 | 35849361002 | 8.70 ppb |
| 2023-12-19 | 35849361003 | 10.2 ppb |
| 2023-12-19 | 35849361004 | 13.5 ppb |
| 2023-12-19 | 35849361005 | 9.70 ppb |
| 2023-12-19 | 35849361006 | 7.80 ppb |
| 2023-12-19 | 35849361007 | 9.00 ppb |
| 2023-12-19 | 35849361008 | 8.70 ppb |