Chloroform
Dayton Public 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.
164
Samples
0
Samples exceeding legal limit (MCL)
164
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 4.36 ppb | 39 | 39 | 0.752 ppb - 12.1 ppb |
| 2015 | 3.56 ppb | 30 | 30 | 0.572 ppb - 9.19 ppb |
| 2016 | 5.15 ppb | 30 | 30 | 0.667 ppb - 19.6 ppb |
| 2017 | 5.04 ppb | 32 | 32 | 0.517 ppb - 13.9 ppb |
| 2018 | 6.27 ppb | 21 | 21 | 0.866 ppb - 12.4 ppb |
| 2019 | 8.07 ppb | 12 | 12 | 3.66 ppb - 15.9 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 |
|---|---|---|
| 2014-01-06 | 140108-84-01 | 4.49 ppb |
| 2014-01-07 | 140108-83-01 | 0.752 ppb |
| 2014-01-07 | 140108-83-03 | 0.954 ppb |
| 2014-03-06 | 140310-89-01 | 2.65 ppb |
| 2014-03-06 | 140310-89-02 | 3.41 ppb |
| 2014-03-06 | 140310-89-03 | 2.59 ppb |
| 2014-03-06 | 140310-89-04 | 2.63 ppb |
| 2014-03-06 | 140310-89-05 | 4.38 ppb |
| 2014-03-06 | 140310-89-06 | 2.90 ppb |
| 2014-03-06 | 140310-89-07 | 3.94 ppb |
| 2014-03-06 | 140310-89-08 | 4.34 ppb |
| 2014-05-12 | 140513-92-01-1-3 | 3.80 ppb |
| 2014-05-12 | 140516-70-01-1-3 | 1.09 ppb |
| 2014-05-12 | 140516-68-01-1-3 | 1.29 ppb |
| 2014-06-05 | 140617-84-01 | 5.65 ppb |
| 2014-06-05 | 140617-84-02 | 11.1 ppb |
| 2014-06-05 | 140617-84-03 | 4.74 ppb |
| 2014-06-05 | 140617-84-04 | 5.00 ppb |
| 2014-06-05 | 140617-84-05 | 10.1 ppb |
| 2014-06-05 | 140617-84-06 | 7.98 ppb |
| 2014-06-05 | 140617-84-07 | 8.46 ppb |
| 2014-06-05 | 140617-84-08 | 3.53 ppb |
| 2014-07-07 | 140709-64-01 | 1.27 ppb |
| 2014-07-07 | 140709-64-03 | 1.33 ppb |
| 2014-07-07 | 140709-66-01 | 4.57 ppb |
| 2014-09-04 | 140905-42-01 | 6.17 ppb |
| 2014-09-04 | 140905-42-02 | 4.94 ppb |
| 2014-09-04 | 140905-42-03 | 8.33 ppb |
| 2014-09-04 | 140905-42-04 | 9.23 ppb |
| 2014-10-07 | 141007-63-01-1 | 1.97 ppb |
| 2014-10-08 | 141009-60-02-1 | 1.57 ppb |
| 2014-10-08 | 141009-60-04-1 | 1.16 ppb |
| 2014-11-03 | 141103-50-01 | 12.1 ppb |
| 2014-11-03 | 141121-69-03 | 1.42 ppb |
| 2014-11-03 | 141121-69-01 | 0.818 ppb |
| 2014-12-04 | 141208-26-01 | 5.58 ppb |
| 2014-12-04 | 141208-26-02 | 5.69 ppb |
| 2014-12-09 | 141210-58-01 | 5.76 ppb |
| 2014-12-09 | 141210-58-02 | 2.40 ppb |
| 2015-03-03 | 150304-17-01 | 3.44 ppb |
| 2015-03-03 | 150304-17-02 | 2.84 ppb |
| 2015-03-03 | 150304-17-03 | 4.01 ppb |
| 2015-03-03 | 150304-17-04 | 2.73 ppb |
| 2015-03-09 | 150310-34-01 | 4.10 ppb |
| 2015-03-09 | 150311-18-01 | 0.998 ppb |
| 2015-03-09 | 150311-18-02 | 0.572 ppb |
| 2015-06-04 | 150605-22-01 | 3.03 ppb |
| 2015-06-04 | 150605-22-02 | 4.82 ppb |
| 2015-06-04 | 150605-22-03 | 5.49 ppb |
| 2015-06-04 | 150605-22-04 | 6.11 ppb |
| 2015-07-06 | 150706-27-02 | 0.609 ppb |
| 2015-07-06 | 150706-27-03 | 0.668 ppb |
| 2015-07-06 | 150706-30-01 | 2.66 ppb |
| 2015-08-05 | 150806-26-03 | 0.658 ppb |
| 2015-08-05 | 150806-26-01 | 0.864 ppb |
| 2015-09-01 | 150901-39-01 | 5.88 ppb |
| 2015-09-01 | 150901-39-02 | 9.19 ppb |
| 2015-09-01 | 150901-39-03 | 3.92 ppb |
| 2015-09-01 | 150901-39-04 | 6.37 ppb |
| 2015-10-12 | 151013-38-02 | 0.968 ppb |
| 2015-10-12 | 151013-38-04 | 1.33 ppb |
| 2015-10-12 | 151013-39-01 | 4.76 ppb |
| 2015-11-03 | 151105-31-02 | 1.09 ppb |
| 2015-11-03 | 151105-32-01 | 2.20 ppb |
| 2015-11-03 | 151105-34-04 | 0.913 ppb |
| 2015-12-03 | 151203-25-01 | 6.13 ppb |
| 2015-12-03 | 151203-25-02 | 5.88 ppb |
| 2015-12-03 | 151203-25-03 | 8.36 ppb |
| 2015-12-03 | 151203-25-04 | 6.22 ppb |
| 2016-01-11 | 160111-28-01 | 0.667 ppb |
| 2016-01-11 | 160111-28-02 | 1.10 ppb |
| 2016-02-11 | 160212-25-01 | 5.48 ppb |
| 2016-03-02 | 160303-32-01 | 4.14 ppb |
| 2016-03-02 | 160303-32-02 | 4.91 ppb |
| 2016-03-02 | 160303-32-03 | 5.01 ppb |
| 2016-03-02 | 160303-32-04 | 5.74 ppb |
| 2016-03-02 | 160303-27-01 | 5.96 ppb |
| 2016-03-02 | 160303-29-01 | 0.776 ppb |
| 2016-03-02 | 160303-29-03 | 0.857 ppb |
| 2016-06-01 | 160607-38-01 | 5.68 ppb |
| 2016-06-01 | 160607-38-02 | 7.14 ppb |
| 2016-06-01 | 160607-38-03 | 6.99 ppb |
| 2016-06-01 | 160607-38-04 | 19.6 ppb |
| 2016-07-06 | 160708-23-01 | 3.52 ppb |
| 2016-07-06 | 160708-26-01 | 1.25 ppb |
| 2016-07-06 | 160708-26-02 | 1.27 ppb |
| 2016-08-08 | 160810-23-02 | 1.04 ppb |
| 2016-08-08 | 160810-23-04 | 0.903 ppb |
| 2016-09-06 | 160907-29-01 | 8.50 ppb |
| 2016-09-06 | 160907-29-02 | 9.91 ppb |
| 2016-09-06 | 160907-29-03 | 12.5 ppb |
| 2016-09-06 | 160907-29-04 | 11.8 ppb |
| 2016-10-03 | 161005-27-01 | 4.29 ppb |
| 2016-10-03 | 161005-26-01 | 1.10 ppb |
| 2016-10-03 | 161005-26-02 | 0.805 ppb |
| 2016-12-05 | 161206-41-01 | 4.47 ppb |
| 2016-12-05 | 161206-41-02 | 7.69 ppb |
| 2016-12-05 | 161206-41-03 | 7.75 ppb |
| 2016-12-05 | 161206-41-04 | 3.52 ppb |
| 2017-01-09 | 170111-28-02-VOC | 1.07 ppb |
| 2017-01-09 | 170111-28-01-VOC | 0.906 ppb |
| 2017-01-09 | 170110-47-01-VOC | 2.54 ppb |
| 2017-01-23 | 170124-41-01-VOC | 7.08 ppb |
| 2017-02-07 | 170207-43-02-VOC | 0.958 ppb |
| 2017-02-07 | 170207-43-04-VOC | 0.946 ppb |
| 2017-02-07 | 170207-44-01-VOC | 2.77 ppb |
| 2017-03-02 | 170302-40-01 | 3.48 ppb |
| 2017-03-02 | 170302-40-02 | 7.09 ppb |
| 2017-03-02 | 170302-40-03 | 6.95 ppb |
| 2017-03-02 | 170302-40-04 | 5.42 ppb |
| 2017-06-01 | 170602-26-01 | 4.22 ppb |
| 2017-06-01 | 170602-26-02 | 8.95 ppb |
| 2017-06-01 | 170602-26-03 | 13.5 ppb |
| 2017-06-01 | 170602-26-04 | 6.96 ppb |
| 2017-06-06 | 170609-31-01VOC | 1.32 ppb |
| 2017-06-06 | 170609-31-02VOC | 0.719 ppb |
| 2017-06-06 | 170607-26-01VOC | 7.80 ppb |
| 2017-07-10 | 170711-44-04VOC | 1.11 ppb |
| 2017-07-10 | 170711-44-02VOC | 1.14 ppb |
| 2017-07-10 | 170711-45-01VOC | 3.70 ppb |
| 2017-08-28 | 170831-31-02 | 0.517 ppb |
| 2017-09-06 | 170907-35-01 | 5.67 ppb |
| 2017-09-06 | 170907-35-02 | 10.2 ppb |
| 2017-09-06 | 170907-35-03 | 12.0 ppb |
| 2017-09-06 | 170907-35-04 | 13.9 ppb |
| 2017-10-25 | 171026-33-01VOC | 0.739 ppb |
| 2017-10-25 | 171026-33-02VOC | 1.00 ppb |
| 2017-12-06 | A170504868 | 5.60 ppb |
| 2017-12-06 | A170504869 | 7.10 ppb |
| 2017-12-06 | A170504870 | 7.90 ppb |
| 2017-12-06 | A170504871 | 8.20 ppb |
| 2018-02-01 | 18206-41-01VOC | 3.63 ppb |
| 2018-03-07 | 180308-32-01 | 3.78 ppb |
| 2018-03-07 | 180308-32-02 | 6.87 ppb |
| 2018-03-07 | 180308-32-03 | 8.66 ppb |
| 2018-03-07 | 180308-32-04 | 6.46 ppb |
| 2018-06-06 | A180578417 | 4.50 ppb |
| 2018-06-06 | A180578418 | 4.70 ppb |
| 2018-06-06 | A180578419 | 11.0 ppb |
| 2018-06-06 | A180578420 | 12.4 ppb |
| 2018-09-05 | 180907-23-01 | 6.49 ppb |
| 2018-09-05 | 180907-23-02 | 8.85 ppb |
| 2018-09-05 | 180907-23-03 | 9.04 ppb |
| 2018-09-05 | 180907-23-04 | 8.65 ppb |
| 2018-09-10 | 180912-25-02-VOC | 0.997 ppb |
| 2018-09-10 | 180912-25-04-VOC | 1.48 ppb |
| 2018-10-08 | 181010-28-02VOC | 0.866 ppb |
| 2018-10-08 | 181010-28-04VOC | 1.43 ppb |
| 2018-12-05 | 181206-37-01 | 4.10 ppb |
| 2018-12-05 | 181206-37-02 | 8.95 ppb |
| 2018-12-05 | 181206-37-03 | 11.0 ppb |
| 2018-12-05 | 181206-37-04 | 7.95 ppb |
| 2019-03-04 | 190306-32-01 | 3.66 ppb |
| 2019-03-04 | 190306-32-02 | 4.32 ppb |
| 2019-03-04 | 190306-32-03 | 7.62 ppb |
| 2019-03-05 | 190306-32-04 | 6.24 ppb |
| 2019-06-05 | 190606-35-01 | 5.08 ppb |
| 2019-06-05 | 190606-35-02 | 4.38 ppb |
| 2019-06-05 | 190606-35-03 | 10.6 ppb |
| 2019-06-05 | 190606-35-04 | 8.01 ppb |
| 2019-09-04 | 190906-23-01 | 11.6 ppb |
| 2019-09-04 | 190906-23-02 | 5.33 ppb |
| 2019-09-04 | 190906-23-03 | 14.2 ppb |
| 2019-09-04 | 190906-23-04 | 15.9 ppb |