Bromoform
City of Manhattan
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.794 ppb | 16 | 14 | ND - 1.60 ppb |
| 2015 | 1.05 ppb | 16 | 16 | 0.580 ppb - 2.10 ppb |
| 2016 | 1.19 ppb | 16 | 16 | 0.670 ppb - 1.90 ppb |
| 2017 | 1.25 ppb | 2 | 2 | 1.000 ppb - 1.50 ppb |
| 2018 | 1.95 ppb | 2 | 2 | 1.90 ppb - 2.00 ppb |
| 2019 | 1.40 ppb | 2 | 2 | 1.40 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform 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 |
|---|---|---|
| 2014-01-08 | 31876 | 0.848 ppb |
| 2014-01-08 | 31875 | 0.752 ppb |
| 2014-01-08 | 31874 | 0.784 ppb |
| 2014-01-08 | 31873 | 0.742 ppb |
| 2014-04-29 | 104282 | 0.700 ppb |
| 2014-04-29 | 104278 | 0.550 ppb |
| 2014-04-29 | 104276 | 0.770 ppb |
| 2014-04-29 | 104271 | 0.530 ppb |
| 2014-07-15 | 152247 | 0.600 ppb |
| 2014-07-15 | 152246 | 0.520 ppb |
| 2014-07-15 | 152245 | ND |
| 2014-07-15 | 152244 | ND |
| 2014-10-21 | 217646 | 1.60 ppb |
| 2014-10-21 | 217640 | 1.30 ppb |
| 2014-10-21 | 217642 | 1.40 ppb |
| 2014-10-21 | 217644 | 1.60 ppb |
| 2015-01-06 | 258829 | 0.610 ppb |
| 2015-01-06 | 258828 | 0.990 ppb |
| 2015-01-06 | 258827 | 0.740 ppb |
| 2015-01-06 | 258826 | 0.650 ppb |
| 2015-04-22 | 317262 | 2.10 ppb |
| 2015-04-22 | 317261 | 2.10 ppb |
| 2015-04-22 | 317260 | 1.70 ppb |
| 2015-04-22 | 317259 | 1.90 ppb |
| 2015-07-21 | 371038 | 0.690 ppb |
| 2015-07-21 | 371040 | 0.740 ppb |
| 2015-07-21 | 371039 | 0.810 ppb |
| 2015-07-21 | 371037 | 0.580 ppb |
| 2015-10-20 | 418914 | 1.000 ppb |
| 2015-10-20 | 418913 | 0.860 ppb |
| 2015-10-20 | 418912 | 0.650 ppb |
| 2015-10-20 | 418911 | 0.690 ppb |
| 2016-01-05 | 470017 | 1.30 ppb |
| 2016-01-05 | 470016 | 0.930 ppb |
| 2016-01-05 | 470015 | 1.000 ppb |
| 2016-01-05 | 470014 | 1.20 ppb |
| 2016-04-19 | 531377 | 1.50 ppb |
| 2016-04-19 | 531378 | 1.80 ppb |
| 2016-04-19 | 531379 | 1.90 ppb |
| 2016-04-19 | 531380 | 1.10 ppb |
| 2016-07-12 | 582034 | 0.900 ppb |
| 2016-07-12 | 582033 | 0.840 ppb |
| 2016-07-12 | 582032 | 0.670 ppb |
| 2016-07-12 | 582031 | 0.900 ppb |
| 2016-10-11 | 642187 | 1.50 ppb |
| 2016-10-11 | 642186 | 1.20 ppb |
| 2016-10-11 | 642185 | 1.10 ppb |
| 2016-10-11 | 642184 | 1.20 ppb |
| 2017-08-29 | 830177 | 1.000 ppb |
| 2017-08-29 | 830176 | 1.50 ppb |
| 2018-08-21 | 1030097 | 1.90 ppb |
| 2018-08-21 | 1030096 | 2.00 ppb |
| 2019-08-13 | 1223539 | 1.40 ppb |
| 2019-08-13 | 1223540 | 1.40 ppb |