Chloroform
Minneapolis
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 | 16.4 ppb | 48 | 48 | 5.20 ppb - 41.0 ppb |
| 2019 | 18.9 ppb | 48 | 48 | 5.60 ppb - 40.0 ppb |
| 2020 | 13.3 ppb | 48 | 48 | 5.20 ppb - 27.0 ppb |
| 2021 | 10.6 ppb | 48 | 48 | 6.60 ppb - 15.0 ppb |
| 2022 | 15.4 ppb | 51 | 50 | ND - 46.0 ppb |
| 2023 | 14.5 ppb | 48 | 48 | 7.00 ppb - 39.0 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 |
|---|---|---|
| 2018-01-09 | 18A0134-01 | 5.60 ppb |
| 2018-01-09 | 18A0134-02 | 6.50 ppb |
| 2018-01-09 | 18A0134-03 | 7.80 ppb |
| 2018-01-09 | 18A0134-04 | 6.10 ppb |
| 2018-01-09 | 18A0136-01 | 6.10 ppb |
| 2018-01-09 | 18A0136-02 | 7.20 ppb |
| 2018-01-09 | 18A0136-03 | 6.00 ppb |
| 2018-01-09 | 18A0136-04 | 5.20 ppb |
| 2018-01-09 | 18A0137-01 | 6.00 ppb |
| 2018-01-09 | 18A0137-02 | 6.10 ppb |
| 2018-01-09 | 18A0137-03 | 6.50 ppb |
| 2018-01-09 | 18A0137-04 | 6.20 ppb |
| 2018-05-03 | 18E0320-01 | 23.0 ppb |
| 2018-05-03 | 18E0320-02 | 24.0 ppb |
| 2018-05-03 | 18E0320-03 | 12.0 ppb |
| 2018-05-03 | 18E0320-04 | 10.00 ppb |
| 2018-05-03 | 18E0323-01 | 13.0 ppb |
| 2018-05-03 | 18E0323-02 | 12.0 ppb |
| 2018-05-03 | 18E0323-03 | 26.0 ppb |
| 2018-05-03 | 18E0323-04 | 17.0 ppb |
| 2018-05-03 | 18E0326-01 | 11.0 ppb |
| 2018-05-03 | 18E0326-02 | 12.0 ppb |
| 2018-05-03 | 18E0326-03 | 14.0 ppb |
| 2018-05-03 | 18E0326-04 | 11.0 ppb |
| 2018-08-07 | 18H0522-01 | 20.0 ppb |
| 2018-08-07 | 18H0522-02 | 21.0 ppb |
| 2018-08-07 | 18H0522-03 | 36.0 ppb |
| 2018-08-07 | 18H0522-04 | 36.0 ppb |
| 2018-08-07 | 18H0525-01 | 19.0 ppb |
| 2018-08-07 | 18H0525-02 | 21.0 ppb |
| 2018-08-07 | 18H0525-03 | 24.0 ppb |
| 2018-08-07 | 18H0525-04 | 23.0 ppb |
| 2018-08-07 | 18H0526-01 | 36.0 ppb |
| 2018-08-07 | 18H0526-02 | 41.0 ppb |
| 2018-08-07 | 18H0526-03 | 22.0 ppb |
| 2018-08-07 | 18H0526-04 | 18.0 ppb |
| 2018-11-06 | 18K0283-01 | 14.0 ppb |
| 2018-11-06 | 18K0283-02 | 14.0 ppb |
| 2018-11-06 | 18K0283-03 | 17.0 ppb |
| 2018-11-06 | 18K0283-04 | 21.0 ppb |
| 2018-11-06 | 18K0284-01 | 26.0 ppb |
| 2018-11-06 | 18K0284-02 | 21.0 ppb |
| 2018-11-06 | 18K0284-03 | 14.0 ppb |
| 2018-11-06 | 18K0284-04 | 14.0 ppb |
| 2018-11-06 | 18K0285-01 | 14.0 ppb |
| 2018-11-06 | 18K0285-02 | 14.0 ppb |
| 2018-11-06 | 18K0285-03 | 20.0 ppb |
| 2018-11-06 | 18K0285-04 | 22.0 ppb |
| 2019-01-08 | 19A0122-01 | 6.60 ppb |
| 2019-01-08 | 19A0122-02 | 6.30 ppb |
| 2019-01-08 | 19A0122-03 | 6.20 ppb |
| 2019-01-08 | 19A0122-04 | 6.70 ppb |
| 2019-01-08 | 19A0124-01 | 6.30 ppb |
| 2019-01-08 | 19A0124-02 | 6.40 ppb |
| 2019-01-08 | 19A0124-03 | 8.10 ppb |
| 2019-01-08 | 19A0124-04 | 7.30 ppb |
| 2019-01-08 | 19A0126-01 | 7.80 ppb |
| 2019-01-08 | 19A0126-02 | 8.70 ppb |
| 2019-01-08 | 19A0126-03 | 6.30 ppb |
| 2019-01-08 | 19A0126-04 | 5.60 ppb |
| 2019-04-16 | 19D0957-01 | 23.0 ppb |
| 2019-04-16 | 19D0957-02 | 25.0 ppb |
| 2019-04-16 | 19D0957-03 | 22.0 ppb |
| 2019-04-16 | 19D0957-04 | 20.0 ppb |
| 2019-04-16 | 19D0958-01 | 22.0 ppb |
| 2019-04-16 | 19D0958-02 | 22.0 ppb |
| 2019-04-16 | 19D0958-03 | 23.0 ppb |
| 2019-04-16 | 19D0958-04 | 24.0 ppb |
| 2019-04-16 | 19D0962-01 | 25.0 ppb |
| 2019-04-16 | 19D0962-02 | 24.0 ppb |
| 2019-04-16 | 19D0962-03 | 21.0 ppb |
| 2019-04-16 | 19D0962-04 | 22.0 ppb |
| 2019-07-16 | 19G0946-01 | 40.0 ppb |
| 2019-07-16 | 19G0946-02 | 38.0 ppb |
| 2019-07-16 | 19G0946-03 | 15.0 ppb |
| 2019-07-16 | 19G0946-04 | 14.0 ppb |
| 2019-07-16 | 19G0949-01 | 15.0 ppb |
| 2019-07-16 | 19G0949-02 | 14.0 ppb |
| 2019-07-16 | 19G0949-03 | 33.0 ppb |
| 2019-07-16 | 19G0949-04 | 25.0 ppb |
| 2019-07-16 | 19G0953-01 | 15.0 ppb |
| 2019-07-16 | 19G0953-02 | 15.0 ppb |
| 2019-07-16 | 19G0953-03 | 38.0 ppb |
| 2019-07-16 | 19G0953-04 | 28.0 ppb |
| 2019-10-15 | 19J0941-01 | 34.0 ppb |
| 2019-10-15 | 19J0941-02 | 29.0 ppb |
| 2019-10-15 | 19J0941-03 | 19.0 ppb |
| 2019-10-15 | 19J0941-04 | 14.0 ppb |
| 2019-10-15 | 19J0942-01 | 16.0 ppb |
| 2019-10-15 | 19J0942-02 | 16.0 ppb |
| 2019-10-15 | 19J0942-03 | 25.0 ppb |
| 2019-10-15 | 19J0942-04 | 20.0 ppb |
| 2019-10-15 | 19J0943-01 | 21.0 ppb |
| 2019-10-15 | 19J0943-02 | 19.0 ppb |
| 2019-10-15 | 19J0943-03 | 31.0 ppb |
| 2019-10-15 | 19J0943-04 | 17.0 ppb |
| 2020-01-15 | 20A0596-01 | 6.10 ppb |
| 2020-01-15 | 20A0596-02 | 5.20 ppb |
| 2020-01-15 | 20A0596-03 | 12.0 ppb |
| 2020-01-15 | 20A0596-04 | 6.10 ppb |
| 2020-01-15 | 20A0597-01 | 6.50 ppb |
| 2020-01-15 | 20A0597-02 | 6.20 ppb |
| 2020-01-15 | 20A0597-03 | 9.70 ppb |
| 2020-01-15 | 20A0597-04 | 7.20 ppb |
| 2020-01-15 | 20A0599-01 | 11.0 ppb |
| 2020-01-15 | 20A0599-02 | 8.20 ppb |
| 2020-01-15 | 20A0599-03 | 6.60 ppb |
| 2020-01-15 | 20A0599-04 | 6.00 ppb |
| 2020-04-21 | 20D0642-01 | 11.0 ppb |
| 2020-04-21 | 20D0642-02 | 10.00 ppb |
| 2020-04-21 | 20D0642-03 | 11.0 ppb |
| 2020-04-21 | 20D0642-04 | 24.0 ppb |
| 2020-04-21 | 20D0643-01 | 23.0 ppb |
| 2020-04-21 | 20D0643-02 | 23.0 ppb |
| 2020-04-21 | 20D0643-03 | 18.0 ppb |
| 2020-04-21 | 20D0643-04 | 23.0 ppb |
| 2020-04-21 | 20D0644-01 | 10.00 ppb |
| 2020-04-21 | 20D0644-02 | 19.0 ppb |
| 2020-04-21 | 20D0644-03 | 24.0 ppb |
| 2020-04-21 | 20D0644-04 | 24.0 ppb |
| 2020-07-15 | 20G1003-01 | 26.0 ppb |
| 2020-07-15 | 20G1003-02 | 12.0 ppb |
| 2020-07-15 | 20G1003-03 | 11.0 ppb |
| 2020-07-15 | 20G1003-04 | 14.0 ppb |
| 2020-07-15 | 20G1004-01 | 27.0 ppb |
| 2020-07-15 | 20G1004-02 | 24.0 ppb |
| 2020-07-15 | 20G1004-03 | 27.0 ppb |
| 2020-07-15 | 20G1004-04 | 22.0 ppb |
| 2020-07-15 | 20G1008-01 | 27.0 ppb |
| 2020-07-15 | 20G1008-02 | 17.0 ppb |
| 2020-07-15 | 20G1008-03 | 9.20 ppb |
| 2020-07-15 | 20G1008-04 | 6.60 ppb |
| 2020-10-20 | 20J1085-01 | 10.00 ppb |
| 2020-10-20 | 20J1085-02 | 11.0 ppb |
| 2020-10-20 | 20J1085-03 | 10.00 ppb |
| 2020-10-20 | 20J1085-04 | 10.00 ppb |
| 2020-10-20 | 20J1086-01 | 11.0 ppb |
| 2020-10-20 | 20J1086-02 | 8.50 ppb |
| 2020-10-20 | 20J1086-03 | 6.80 ppb |
| 2020-10-20 | 20J1086-04 | 6.20 ppb |
| 2020-10-20 | 20J1087-01 | 8.60 ppb |
| 2020-10-20 | 20J1087-02 | 6.30 ppb |
| 2020-10-20 | 20J1087-03 | 8.40 ppb |
| 2020-10-20 | 20J1087-04 | 8.10 ppb |
| 2021-01-26 | 21A0751-01 | 7.00 ppb |
| 2021-01-26 | 21A0751-02 | 11.0 ppb |
| 2021-01-26 | 21A0751-03 | 11.0 ppb |
| 2021-01-26 | 21A0751-04 | 10.00 ppb |
| 2021-01-26 | 21A0752-01 | 7.10 ppb |
| 2021-01-26 | 21A0752-02 | 9.30 ppb |
| 2021-01-26 | 21A0752-03 | 9.80 ppb |
| 2021-01-26 | 21A0752-04 | 10.00 ppb |
| 2021-01-26 | 21A0753-01 | 6.80 ppb |
| 2021-01-26 | 21A0753-02 | 7.00 ppb |
| 2021-01-26 | 21A0753-03 | 6.60 ppb |
| 2021-01-26 | 21A0753-04 | 12.0 ppb |
| 2021-04-20 | 21D1027-01 | 9.30 ppb |
| 2021-04-20 | 21D1027-02 | 14.0 ppb |
| 2021-04-20 | 21D1027-03 | 15.0 ppb |
| 2021-04-20 | 21D1027-04 | 15.0 ppb |
| 2021-04-20 | 21D1028-01 | 9.40 ppb |
| 2021-04-20 | 21D1028-02 | 9.50 ppb |
| 2021-04-20 | 21D1028-03 | 9.60 ppb |
| 2021-04-20 | 21D1028-04 | 12.0 ppb |
| 2021-04-20 | 21D1029-01 | 9.70 ppb |
| 2021-04-20 | 21D1029-02 | 9.60 ppb |
| 2021-04-20 | 21D1029-03 | 15.0 ppb |
| 2021-04-20 | 21D1029-04 | 14.0 ppb |
| 2021-07-14 | 21G0746-01 | 9.20 ppb |
| 2021-07-14 | 21G0746-02 | 7.20 ppb |
| 2021-07-14 | 21G0746-03 | 12.0 ppb |
| 2021-07-14 | 21G0746-04 | 12.0 ppb |
| 2021-07-14 | 21G0749-01 | 11.0 ppb |
| 2021-07-14 | 21G0749-02 | 10.00 ppb |
| 2021-07-14 | 21G0749-03 | 11.0 ppb |
| 2021-07-14 | 21G0749-04 | 7.50 ppb |
| 2021-07-14 | 21G0750-01 | 10.00 ppb |
| 2021-07-14 | 21G0750-02 | 8.60 ppb |
| 2021-07-14 | 21G0750-03 | 7.80 ppb |
| 2021-07-14 | 21G0750-04 | 8.60 ppb |
| 2021-10-19 | 21J0923-01 | 11.0 ppb |
| 2021-10-19 | 21J0923-02 | 13.0 ppb |
| 2021-10-19 | 21J0923-03 | 14.0 ppb |
| 2021-10-19 | 21J0923-04 | 10.00 ppb |
| 2021-10-19 | 21J0924-01 | 10.00 ppb |
| 2021-10-19 | 21J0924-02 | 10.00 ppb |
| 2021-10-19 | 21J0924-03 | 13.0 ppb |
| 2021-10-19 | 21J0924-04 | 14.0 ppb |
| 2021-10-19 | 21J0925-01 | 10.00 ppb |
| 2021-10-19 | 21J0925-02 | 13.0 ppb |
| 2021-10-19 | 21J0925-03 | 12.0 ppb |
| 2021-10-19 | 21J0925-04 | 12.0 ppb |
| 2022-01-12 | 22A0382-01 | ND |
| 2022-01-12 | 22A0382-02 | 14.0 ppb |
| 2022-01-12 | 22A0382-03 | 9.60 ppb |
| 2022-01-12 | 22A0382-04 | 13.0 ppb |
| 2022-01-12 | 22A0383-01 | 7.10 ppb |
| 2022-01-12 | 22A0383-02 | 7.00 ppb |
| 2022-01-12 | 22A0383-03 | 13.0 ppb |
| 2022-01-12 | 22A0383-04 | 12.0 ppb |
| 2022-01-12 | 22A0384-01 | 7.30 ppb |
| 2022-01-12 | 22A0384-02 | 7.50 ppb |
| 2022-01-12 | 22A0384-03 | 15.0 ppb |
| 2022-01-12 | 22A0384-04 | 14.0 ppb |
| 2022-04-13 | 22D0682-01 | 12.0 ppb |
| 2022-04-13 | 22D0682-02 | 13.0 ppb |
| 2022-04-13 | 22D0682-03 | 19.0 ppb |
| 2022-04-13 | 22D0682-04 | 12.0 ppb |
| 2022-04-13 | 22D0683-01 | 8.90 ppb |
| 2022-04-13 | 22D0683-02 | 10.00 ppb |
| 2022-04-13 | 22D0683-03 | 11.0 ppb |
| 2022-04-13 | 22D0683-04 | 11.0 ppb |
| 2022-04-13 | 22D0684-01 | 12.0 ppb |
| 2022-04-13 | 22D0684-02 | 11.0 ppb |
| 2022-04-13 | 22D0684-03 | 11.0 ppb |
| 2022-04-13 | 22D0684-04 | 12.0 ppb |
| 2022-07-20 | 22G1335-01 | 46.0 ppb |
| 2022-07-20 | 22G1335-02 | 41.0 ppb |
| 2022-07-20 | 22G1335-03 | 21.0 ppb |
| 2022-07-20 | 22G1335-04 | 20.0 ppb |
| 2022-07-20 | 22G1344-01 | 21.0 ppb |
| 2022-07-20 | 22G1344-02 | 22.0 ppb |
| 2022-07-20 | 22G1344-03 | 20.0 ppb |
| 2022-07-20 | 22G1345-01 | 23.0 ppb |
| 2022-07-20 | 22G1345-02 | 20.0 ppb |
| 2022-07-20 | 22G1345-03 | 28.0 ppb |
| 2022-07-20 | 22G1345-04 | 24.0 ppb |
| 2022-08-08 | 22H0788-01 | 21.0 ppb |
| 2022-08-08 | 22H0788-02 | 21.0 ppb |
| 2022-08-08 | 22H0788-03 | 29.0 ppb |
| 2022-08-08 | 22H0788-04 | 32.0 ppb |
| 2022-10-25 | 22J1118-01 | 8.50 ppb |
| 2022-10-25 | 22J1118-02 | 9.10 ppb |
| 2022-10-25 | 22J1118-03 | 15.0 ppb |
| 2022-10-25 | 22J1118-04 | 8.70 ppb |
| 2022-10-25 | 22J1119-01 | 11.0 ppb |
| 2022-10-25 | 22J1119-02 | 8.10 ppb |
| 2022-10-25 | 22J1119-03 | 18.0 ppb |
| 2022-10-25 | 22J1119-04 | 9.00 ppb |
| 2022-10-25 | 22J1120-01 | 17.0 ppb |
| 2022-10-25 | 22J1120-02 | 15.0 ppb |
| 2022-10-25 | 22J1120-03 | 8.30 ppb |
| 2022-10-25 | 22J1120-04 | 7.50 ppb |
| 2023-01-12 | 23A0374-01 | 11.0 ppb |
| 2023-01-12 | 23A0374-02 | 12.0 ppb |
| 2023-01-12 | 23A0374-03 | 21.0 ppb |
| 2023-01-12 | 23A0374-04 | 12.0 ppb |
| 2023-01-12 | 23A0375-01 | 14.0 ppb |
| 2023-01-12 | 23A0375-02 | 18.0 ppb |
| 2023-01-12 | 23A0375-03 | 21.0 ppb |
| 2023-01-12 | 23A0375-04 | 16.0 ppb |
| 2023-01-12 | 23A0376-01 | 19.0 ppb |
| 2023-01-12 | 23A0376-02 | 24.0 ppb |
| 2023-01-12 | 23A0376-03 | 14.0 ppb |
| 2023-01-12 | 23A0376-04 | 12.0 ppb |
| 2023-04-25 | 23D1446-01 | 23.0 ppb |
| 2023-04-25 | 23D1446-02 | 31.0 ppb |
| 2023-04-25 | 23D1446-03 | 15.0 ppb |
| 2023-04-25 | 23D1446-04 | 17.0 ppb |
| 2023-04-25 | 23D1447-01 | 17.0 ppb |
| 2023-04-25 | 23D1447-02 | 18.0 ppb |
| 2023-04-25 | 23D1447-03 | 24.0 ppb |
| 2023-04-25 | 23D1447-04 | 18.0 ppb |
| 2023-04-25 | 23D1448-01 | 16.0 ppb |
| 2023-04-25 | 23D1448-02 | 11.0 ppb |
| 2023-04-25 | 23D1448-03 | 39.0 ppb |
| 2023-04-25 | 23D1448-04 | 19.0 ppb |
| 2023-07-25 | 23G1672-01 | 7.90 ppb |
| 2023-07-25 | 23G1672-02 | 7.30 ppb |
| 2023-07-25 | 23G1672-03 | 14.0 ppb |
| 2023-07-25 | 23G1672-04 | 16.0 ppb |
| 2023-07-25 | 23G1674-01 | 16.0 ppb |
| 2023-07-25 | 23G1674-02 | 17.0 ppb |
| 2023-07-25 | 23G1674-03 | 8.20 ppb |
| 2023-07-25 | 23G1674-04 | 7.70 ppb |
| 2023-07-25 | 23G1675-01 | 8.10 ppb |
| 2023-07-25 | 23G1675-02 | 11.0 ppb |
| 2023-07-25 | 23G1675-03 | 17.0 ppb |
| 2023-07-25 | 23G1675-04 | 12.0 ppb |
| 2023-10-31 | 23J1810-01 | 8.10 ppb |
| 2023-10-31 | 23J1810-02 | 8.80 ppb |
| 2023-10-31 | 23J1810-03 | 12.0 ppb |
| 2023-10-31 | 23J1810-04 | 12.0 ppb |
| 2023-10-31 | 23J1810-05 | 7.90 ppb |
| 2023-10-31 | 23J1810-06 | 7.90 ppb |
| 2023-10-31 | 23J1810-07 | 9.40 ppb |
| 2023-10-31 | 23J1810-08 | 11.0 ppb |
| 2023-10-31 | 23J1810-09 | 9.40 ppb |
| 2023-10-31 | 23J1810-10 | 8.60 ppb |
| 2023-10-31 | 23J1810-11 | 8.40 ppb |
| 2023-10-31 | 23J1810-12 | 7.00 ppb |