Chloroform
New Orleans Algiers Water Works
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 | 21.2 ppb | 64 | 64 | 9.10 ppb - 50.7 ppb |
| 2019 | 16.9 ppb | 64 | 64 | 8.70 ppb - 31.6 ppb |
| 2020 | 15.6 ppb | 32 | 32 | 6.40 ppb - 33.6 ppb |
| 2021 | 23.7 ppb | 32 | 32 | 9.70 ppb - 48.0 ppb |
| 2022 | 19.5 ppb | 40 | 40 | 7.60 ppb - 33.8 ppb |
| 2023 | 18.9 ppb | 32 | 32 | 5.40 ppb - 34.3 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 |
|---|---|---|
| 2018-01-26 | 35370656001 | 41.6 ppb |
| 2018-01-26 | 35370656002 | 39.9 ppb |
| 2018-01-26 | 35370656003 | 43.8 ppb |
| 2018-01-26 | 35370656004 | 47.5 ppb |
| 2018-01-26 | 35370656005 | 50.7 ppb |
| 2018-01-26 | 35370656006 | 47.2 ppb |
| 2018-01-26 | 35370656001 | 41.6 ppb |
| 2018-01-26 | 35370656002 | 39.9 ppb |
| 2018-01-26 | 35370656003 | 43.8 ppb |
| 2018-01-26 | 35370656004 | 47.5 ppb |
| 2018-01-26 | 35370656005 | 50.7 ppb |
| 2018-01-26 | 35370656006 | 47.2 ppb |
| 2018-01-29 | 35371046001 | 30.0 ppb |
| 2018-01-29 | 35371046002 | 30.7 ppb |
| 2018-01-29 | 35371046001 | 30.0 ppb |
| 2018-01-29 | 35371046002 | 30.7 ppb |
| 2018-04-18 | 35387133001 | 13.6 ppb |
| 2018-04-18 | 35387133002 | 13.0 ppb |
| 2018-04-18 | 35387133003 | 11.7 ppb |
| 2018-04-18 | 35387133004 | 10.5 ppb |
| 2018-04-18 | 35387133005 | 18.6 ppb |
| 2018-04-18 | 35387133006 | 11.1 ppb |
| 2018-04-18 | 35387133007 | 11.4 ppb |
| 2018-04-18 | 35387133008 | 9.90 ppb |
| 2018-04-18 | 35387133001 | 13.6 ppb |
| 2018-04-18 | 35387133002 | 13.0 ppb |
| 2018-04-18 | 35387133003 | 11.7 ppb |
| 2018-04-18 | 35387133004 | 10.5 ppb |
| 2018-04-18 | 35387133005 | 18.6 ppb |
| 2018-04-18 | 35387133006 | 11.1 ppb |
| 2018-04-18 | 35387133007 | 11.4 ppb |
| 2018-04-18 | 35387133008 | 9.90 ppb |
| 2018-07-24 | 35407086001 | 14.7 ppb |
| 2018-07-24 | 35407086002 | 19.9 ppb |
| 2018-07-24 | 35407086003 | 18.5 ppb |
| 2018-07-24 | 35407086004 | 19.6 ppb |
| 2018-07-24 | 35407086005 | 24.8 ppb |
| 2018-07-24 | 35407086007 | 17.9 ppb |
| 2018-07-24 | 35407086008 | 15.0 ppb |
| 2018-07-24 | 35407086001 | 14.7 ppb |
| 2018-07-24 | 35407086002 | 19.9 ppb |
| 2018-07-24 | 35407086003 | 18.5 ppb |
| 2018-07-24 | 35407086004 | 19.6 ppb |
| 2018-07-24 | 35407086005 | 24.8 ppb |
| 2018-07-24 | 35407086007 | 17.9 ppb |
| 2018-07-24 | 35407086008 | 15.0 ppb |
| 2018-07-31 | 35407845001 | 17.8 ppb |
| 2018-07-31 | 35407845001 | 17.8 ppb |
| 2018-10-16 | 35424779001 | 12.7 ppb |
| 2018-10-16 | 35424779002 | 12.8 ppb |
| 2018-10-16 | 35424779003 | 9.60 ppb |
| 2018-10-16 | 35424779004 | 15.0 ppb |
| 2018-10-16 | 35424779005 | 21.0 ppb |
| 2018-10-16 | 35424779006 | 9.10 ppb |
| 2018-10-16 | 35424779007 | 10.1 ppb |
| 2018-10-16 | 35424779008 | 9.70 ppb |
| 2018-10-16 | 35424779001 | 12.7 ppb |
| 2018-10-16 | 35424779002 | 12.8 ppb |
| 2018-10-16 | 35424779003 | 9.60 ppb |
| 2018-10-16 | 35424779004 | 15.0 ppb |
| 2018-10-16 | 35424779005 | 21.0 ppb |
| 2018-10-16 | 35424779006 | 9.10 ppb |
| 2018-10-16 | 35424779007 | 10.1 ppb |
| 2018-10-16 | 35424779008 | 9.70 ppb |
| 2019-01-09 | 35441740001 | 26.3 ppb |
| 2019-01-09 | 35441740002 | 29.2 ppb |
| 2019-01-09 | 35441740003 | 21.3 ppb |
| 2019-01-09 | 35441740004 | 29.1 ppb |
| 2019-01-09 | 35441740005 | 31.6 ppb |
| 2019-01-09 | 35441740006 | 20.8 ppb |
| 2019-01-09 | 35441740007 | 20.5 ppb |
| 2019-01-09 | 35441740008 | 23.6 ppb |
| 2019-01-09 | 35441740001 | 26.3 ppb |
| 2019-01-09 | 35441740002 | 29.2 ppb |
| 2019-01-09 | 35441740003 | 21.3 ppb |
| 2019-01-09 | 35441740004 | 29.1 ppb |
| 2019-01-09 | 35441740005 | 31.6 ppb |
| 2019-01-09 | 35441740006 | 20.8 ppb |
| 2019-01-09 | 35441740007 | 20.5 ppb |
| 2019-01-09 | 35441740008 | 23.6 ppb |
| 2019-04-26 | 35464578001 | 16.0 ppb |
| 2019-04-26 | 35464578002 | 16.5 ppb |
| 2019-04-26 | 35464578003 | 15.6 ppb |
| 2019-04-26 | 35464578004 | 13.6 ppb |
| 2019-04-26 | 35464578005 | 21.1 ppb |
| 2019-04-26 | 35464578006 | 9.50 ppb |
| 2019-04-26 | 35464578007 | 11.0 ppb |
| 2019-04-26 | 35464578008 | 11.2 ppb |
| 2019-04-26 | 35464578001 | 16.0 ppb |
| 2019-04-26 | 35464578002 | 16.5 ppb |
| 2019-04-26 | 35464578003 | 15.6 ppb |
| 2019-04-26 | 35464578004 | 13.6 ppb |
| 2019-04-26 | 35464578005 | 21.1 ppb |
| 2019-04-26 | 35464578006 | 9.50 ppb |
| 2019-04-26 | 35464578007 | 11.0 ppb |
| 2019-04-26 | 35464578008 | 11.2 ppb |
| 2019-07-11 | 35481752001 | 13.3 ppb |
| 2019-07-11 | 35481752002 | 17.9 ppb |
| 2019-07-11 | 35481752003 | 12.1 ppb |
| 2019-07-11 | 35481752004 | 18.0 ppb |
| 2019-07-11 | 35481752005 | 22.2 ppb |
| 2019-07-11 | 35481752006 | 12.0 ppb |
| 2019-07-11 | 35481752007 | 13.0 ppb |
| 2019-07-11 | 35481752008 | 13.8 ppb |
| 2019-07-11 | 35481752001 | 13.3 ppb |
| 2019-07-11 | 35481752002 | 17.9 ppb |
| 2019-07-11 | 35481752003 | 12.1 ppb |
| 2019-07-11 | 35481752004 | 18.0 ppb |
| 2019-07-11 | 35481752005 | 22.2 ppb |
| 2019-07-11 | 35481752006 | 12.0 ppb |
| 2019-07-11 | 35481752007 | 13.0 ppb |
| 2019-07-11 | 35481752008 | 13.8 ppb |
| 2019-10-15 | 35505751001 | 12.5 ppb |
| 2019-10-15 | 35505751002 | 14.9 ppb |
| 2019-10-15 | 35505751003 | 10.1 ppb |
| 2019-10-15 | 35505751004 | 13.9 ppb |
| 2019-10-15 | 35505751005 | 19.3 ppb |
| 2019-10-15 | 35505751006 | 9.30 ppb |
| 2019-10-15 | 35505751007 | 13.0 ppb |
| 2019-10-15 | 35505751008 | 8.70 ppb |
| 2019-10-15 | 35505751001 | 12.5 ppb |
| 2019-10-15 | 35505751002 | 14.9 ppb |
| 2019-10-15 | 35505751003 | 10.1 ppb |
| 2019-10-15 | 35505751004 | 13.9 ppb |
| 2019-10-15 | 35505751005 | 19.3 ppb |
| 2019-10-15 | 35505751006 | 9.30 ppb |
| 2019-10-15 | 35505751007 | 13.0 ppb |
| 2019-10-15 | 35505751008 | 8.70 ppb |
| 2020-01-17 | 35525781001 | 33.6 ppb |
| 2020-01-17 | 35525781002 | 28.4 ppb |
| 2020-01-17 | 35525781003 | 28.8 ppb |
| 2020-01-17 | 35525781004 | 28.2 ppb |
| 2020-01-17 | 35525781005 | 32.4 ppb |
| 2020-01-17 | 35525781006 | 25.4 ppb |
| 2020-01-17 | 35525781007 | 27.7 ppb |
| 2020-01-17 | 35525781008 | 27.7 ppb |
| 2020-04-23 | 35545804001 | 7.60 ppb |
| 2020-04-23 | 35545804002 | 6.40 ppb |
| 2020-04-23 | 35545804003 | 7.20 ppb |
| 2020-04-23 | 35545804004 | 6.80 ppb |
| 2020-04-23 | 35545804005 | 9.10 ppb |
| 2020-04-23 | 35545804006 | 7.20 ppb |
| 2020-04-23 | 35545804007 | 7.60 ppb |
| 2020-04-23 | 35545804008 | 6.80 ppb |
| 2020-07-17 | 35564196001 | 13.6 ppb |
| 2020-07-17 | 35564196002 | 17.8 ppb |
| 2020-07-17 | 35564196003 | 17.7 ppb |
| 2020-07-17 | 35564196004 | 20.4 ppb |
| 2020-07-17 | 35564196005 | 13.4 ppb |
| 2020-07-17 | 35564196006 | 9.10 ppb |
| 2020-07-17 | 35564196007 | 19.2 ppb |
| 2020-07-17 | 35564196008 | 17.3 ppb |
| 2020-10-22 | 35587098001 | 11.3 ppb |
| 2020-10-22 | 35587098002 | 10.6 ppb |
| 2020-10-22 | 35587098003 | 12.8 ppb |
| 2020-10-22 | 35587098004 | 7.90 ppb |
| 2020-10-22 | 35587098005 | 9.20 ppb |
| 2020-10-22 | 35587098006 | 7.90 ppb |
| 2020-10-22 | 35587098007 | 13.3 ppb |
| 2020-10-22 | 35587098008 | 8.10 ppb |
| 2021-01-14 | 35605079001 | 23.5 ppb |
| 2021-01-14 | 35605079002 | 27.4 ppb |
| 2021-01-14 | 35605079003 | 23.0 ppb |
| 2021-01-14 | 35605079004 | 26.4 ppb |
| 2021-01-14 | 35605079005 | 27.9 ppb |
| 2021-01-14 | 35605079006 | 20.4 ppb |
| 2021-01-14 | 35605079007 | 23.6 ppb |
| 2021-01-14 | 35605079008 | 24.2 ppb |
| 2021-04-22 | 35628251001 | 32.7 ppb |
| 2021-04-22 | 35628251002 | 32.1 ppb |
| 2021-04-22 | 35628251003 | 32.6 ppb |
| 2021-04-22 | 35628251004 | 37.4 ppb |
| 2021-04-22 | 35628251005 | 48.0 ppb |
| 2021-04-22 | 35628251006 | 31.6 ppb |
| 2021-04-22 | 35628251007 | 24.1 ppb |
| 2021-04-22 | 35628251008 | 32.2 ppb |
| 2021-07-23 | 35650336001 | 19.1 ppb |
| 2021-07-23 | 35650336002 | 23.9 ppb |
| 2021-07-23 | 35650336003 | 26.5 ppb |
| 2021-07-23 | 35650336004 | 29.8 ppb |
| 2021-07-23 | 35650336005 | 32.1 ppb |
| 2021-07-23 | 35650336006 | 19.1 ppb |
| 2021-07-23 | 35650336007 | 18.6 ppb |
| 2021-07-23 | 35650336008 | 21.9 ppb |
| 2021-10-28 | 35674062001 | 13.2 ppb |
| 2021-10-28 | 35674062002 | 13.3 ppb |
| 2021-10-28 | 35674062003 | 11.6 ppb |
| 2021-10-28 | 35674062004 | 14.0 ppb |
| 2021-10-28 | 35674062005 | 15.6 ppb |
| 2021-10-28 | 35674062006 | 14.3 ppb |
| 2021-10-28 | 35674062007 | 9.70 ppb |
| 2021-10-28 | 35674062008 | 9.70 ppb |
| 2022-01-25 | 35693393001 | 22.8 ppb |
| 2022-01-25 | 35693393002 | 27.5 ppb |
| 2022-01-25 | 35693393003 | 24.8 ppb |
| 2022-01-25 | 35693393004 | 28.6 ppb |
| 2022-01-25 | 35693393005 | 28.0 ppb |
| 2022-01-25 | 35693393006 | 21.5 ppb |
| 2022-01-25 | 35693393007 | 23.0 ppb |
| 2022-01-25 | 35693393008 | 23.7 ppb |
| 2022-04-08 | 35709551001 | 30.0 ppb |
| 2022-04-08 | 35709551002 | 33.8 ppb |
| 2022-04-08 | 35709551003 | 30.3 ppb |
| 2022-04-08 | 35709551004 | 30.2 ppb |
| 2022-04-08 | 35709551005 | 31.9 ppb |
| 2022-04-08 | 35709551006 | 26.5 ppb |
| 2022-04-08 | 35709551007 | 26.9 ppb |
| 2022-04-08 | 35709551008 | 27.3 ppb |
| 2022-07-28 | 35735273001 | 17.1 ppb |
| 2022-07-28 | 35735273002 | 20.4 ppb |
| 2022-07-28 | 35735273003 | 13.4 ppb |
| 2022-07-28 | 35735273004 | 19.5 ppb |
| 2022-07-28 | 35735273005 | 20.7 ppb |
| 2022-07-28 | 35735273006 | 15.7 ppb |
| 2022-07-28 | 35735273007 | 14.9 ppb |
| 2022-07-28 | 35735273008 | 14.8 ppb |
| 2022-08-16 | 35739922001 | 16.4 ppb |
| 2022-08-16 | 35739922002 | 18.2 ppb |
| 2022-08-16 | 35739922003 | 14.6 ppb |
| 2022-08-16 | 35739922004 | 18.7 ppb |
| 2022-08-16 | 35739922005 | 17.9 ppb |
| 2022-08-16 | 35739922006 | 15.2 ppb |
| 2022-08-16 | 35739922007 | 12.3 ppb |
| 2022-08-16 | 35739922008 | 14.3 ppb |
| 2022-10-20 | 35755557001 | 10.7 ppb |
| 2022-10-20 | 35755557002 | 11.1 ppb |
| 2022-10-20 | 35755557003 | 7.90 ppb |
| 2022-10-20 | 35755557004 | 12.6 ppb |
| 2022-10-20 | 35755557005 | 14.2 ppb |
| 2022-10-20 | 35755557006 | 8.60 ppb |
| 2022-10-20 | 35755557007 | 7.60 ppb |
| 2022-10-20 | 35755557008 | 8.30 ppb |
| 2023-01-05 | 35770758001 | 22.1 ppb |
| 2023-01-05 | 35770758002 | 27.3 ppb |
| 2023-01-05 | 35770758003 | 19.9 ppb |
| 2023-01-05 | 35770758004 | 20.1 ppb |
| 2023-01-05 | 35770758005 | 24.7 ppb |
| 2023-01-05 | 35770758006 | 19.0 ppb |
| 2023-01-05 | 35770758007 | 20.3 ppb |
| 2023-01-05 | 35770758008 | 19.1 ppb |
| 2023-04-13 | 35792659001 | 32.6 ppb |
| 2023-04-13 | 35792659002 | 34.3 ppb |
| 2023-04-13 | 35792659003 | 28.9 ppb |
| 2023-04-13 | 35792659004 | 29.7 ppb |
| 2023-04-13 | 35792659005 | 32.9 ppb |
| 2023-04-13 | 35792659006 | 27.5 ppb |
| 2023-04-13 | 35792659007 | 32.2 ppb |
| 2023-04-13 | 35792659008 | 31.2 ppb |
| 2023-07-13 | 35813160001 | 17.7 ppb |
| 2023-07-13 | 35813160002 | 12.1 ppb |
| 2023-07-13 | 35813160003 | 14.0 ppb |
| 2023-07-13 | 35813160004 | 21.8 ppb |
| 2023-07-13 | 35813160005 | 16.2 ppb |
| 2023-07-13 | 35813160006 | 16.2 ppb |
| 2023-07-13 | 35813160007 | 14.7 ppb |
| 2023-07-13 | 35813160008 | 11.4 ppb |
| 2023-10-05 | 35832718001 | 7.30 ppb |
| 2023-10-05 | 35832718002 | 10.4 ppb |
| 2023-10-05 | 35832718003 | 7.30 ppb |
| 2023-10-05 | 35832718004 | 6.00 ppb |
| 2023-10-05 | 35832718005 | 11.9 ppb |
| 2023-10-05 | 35832718006 | 6.50 ppb |
| 2023-10-05 | 35832718007 | 5.60 ppb |
| 2023-10-05 | 35832718008 | 5.40 ppb |