Bromoform
Bates County Public Water Supply District 5
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 | 0.263 ppb | 8 | 3 | ND - 0.760 ppb |
| 2015 | 0.729 ppb | 8 | 6 | ND - 1.42 ppb |
| 2016 | 0.810 ppb | 8 | 6 | ND - 1.44 ppb |
| 2017 | 1.07 ppb | 8 | 8 | 0.750 ppb - 1.79 ppb |
| 2018 | 1.60 ppb | 8 | 8 | 0.810 ppb - 2.85 ppb |
| 2019 | 0.896 ppb | 8 | 8 | 0.590 ppb - 1.31 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 |
|---|---|---|
| 2014-01-09 | AC16706 | ND |
| 2014-01-09 | AC16705 | ND |
| 2014-04-15 | AC21613 | ND |
| 2014-04-15 | AC21612 | ND |
| 2014-07-24 | AC30636 | 0.760 ppb |
| 2014-07-24 | AC30637 | 0.740 ppb |
| 2014-10-20 | AC37653 | 0.600 ppb |
| 2014-10-20 | AC37654 | ND |
| 2015-01-19 | AC40377 | ND |
| 2015-01-19 | AC40378 | ND |
| 2015-04-22 | AC45047 | 0.800 ppb |
| 2015-04-22 | AC45048 | 0.690 ppb |
| 2015-07-20 | AC54283 | 1.09 ppb |
| 2015-07-20 | AC54282 | 1.000 ppb |
| 2015-10-20 | AC61209 | 1.42 ppb |
| 2015-10-20 | AC61210 | 0.830 ppb |
| 2016-01-13 | AC65016 | ND |
| 2016-01-13 | AC65017 | ND |
| 2016-04-19 | AC69375 | 0.850 ppb |
| 2016-04-19 | AC69376 | 0.840 ppb |
| 2016-09-08 | AC83803 | 1.44 ppb |
| 2016-09-08 | AC83802 | 1.28 ppb |
| 2016-10-20 | AC86283 | 1.12 ppb |
| 2016-10-20 | AC86284 | 0.950 ppb |
| 2017-01-23 | AC89094 | 0.820 ppb |
| 2017-01-23 | AC89095 | 0.750 ppb |
| 2017-04-19 | AC94456 | 1.000 ppb |
| 2017-04-20 | AC94457 | 1.02 ppb |
| 2017-07-11 | AD01394 | 1.19 ppb |
| 2017-07-11 | AD01393 | 1.11 ppb |
| 2017-10-17 | AD07892 | 1.79 ppb |
| 2017-10-17 | AD07893 | 0.910 ppb |
| 2018-01-23 | AD11334 | 0.920 ppb |
| 2018-01-23 | AD11335 | 0.810 ppb |
| 2018-04-17 | AD18007 | 1.14 ppb |
| 2018-04-17 | AD18008 | 1.07 ppb |
| 2018-07-24 | AD29171 | 2.59 ppb |
| 2018-07-24 | AD29172 | 1.92 ppb |
| 2018-10-23 | AD34409 | 1.47 ppb |
| 2018-10-23 | AD34408 | 2.85 ppb |
| 2019-01-23 | AD37717 | 0.720 ppb |
| 2019-01-23 | AD37718 | 0.590 ppb |
| 2019-04-16 | AD46137 | 0.820 ppb |
| 2019-04-16 | AD46138 | 0.740 ppb |
| 2019-07-24 | AD51789 | 1.31 ppb |
| 2019-07-24 | AD51790 | 1.15 ppb |
| 2019-10-16 | AD56722 | 1.22 ppb |
| 2019-10-16 | AD56723 | 0.620 ppb |