Bromoform
Manchester Utilities Authority
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.14 ppb | 16 | 12 | ND - 2.75 ppb |
| 2015 | 1.41 ppb | 16 | 15 | ND - 2.26 ppb |
| 2016 | 0.401 ppb | 16 | 9 | ND - 0.820 ppb |
| 2017 | 0.991 ppb | 16 | 11 | ND - 2.96 ppb |
| 2018 | 0.203 ppb | 16 | 4 | ND - 0.940 ppb |
| 2019 | 0.165 ppb | 16 | 4 | ND - 0.810 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 |
|---|---|---|
| 2014-02-11 | AB47090TH | 1.84 ppb |
| 2014-02-11 | AB47091TH | 2.32 ppb |
| 2014-02-11 | AB47092TH | 2.75 ppb |
| 2014-02-11 | AB47093TH | 1.88 ppb |
| 2014-05-13 | AB50751TH | ND |
| 2014-05-13 | AB50752TH | ND |
| 2014-05-13 | AB50750TH | ND |
| 2014-05-13 | AB50753TH | ND |
| 2014-08-12 | AB54567TH | 1.31 ppb |
| 2014-08-12 | AB54568TH | 1.33 ppb |
| 2014-08-12 | AB54566TH | 1.86 ppb |
| 2014-08-12 | AB54569TH | 1.41 ppb |
| 2014-11-10 | AB58174TH | 0.934 ppb |
| 2014-11-10 | AB58173TH | 0.762 ppb |
| 2014-11-10 | AB58172TH | 0.867 ppb |
| 2014-11-10 | AB58175TH | 0.920 ppb |
| 2015-02-10 | AB61647TH | ND |
| 2015-02-10 | AB61645TH | 1.59 ppb |
| 2015-02-10 | AB61644TH | 1.97 ppb |
| 2015-02-10 | AB61646TH | 1.52 ppb |
| 2015-05-12 | AB65424TH | 0.992 ppb |
| 2015-05-12 | AB65421TH | 1.20 ppb |
| 2015-05-12 | AB65422TH | 0.891 ppb |
| 2015-05-12 | AB65423TH | 1.07 ppb |
| 2015-08-12 | AB69736TH | 2.08 ppb |
| 2015-08-12 | AB69733TH | 2.26 ppb |
| 2015-08-12 | AB69734TH | 2.26 ppb |
| 2015-08-12 | AB69735TH | 1.96 ppb |
| 2015-11-10 | AB73573TH | 1.20 ppb |
| 2015-11-10 | AB73576TH | 1.12 ppb |
| 2015-11-10 | AB73574TH | 1.11 ppb |
| 2015-11-10 | AB73575TH | 1.36 ppb |
| 2016-02-09 | AB76995TH | ND |
| 2016-02-09 | AB76992TH | ND |
| 2016-02-09 | AB76994TH | ND |
| 2016-02-09 | AB76993TH | ND |
| 2016-05-10 | AB80982TH | ND |
| 2016-05-10 | AB80984TH | ND |
| 2016-05-10 | AB80985TH | ND |
| 2016-05-10 | AB80983TH | 0.550 ppb |
| 2016-08-09 | AB85032TH | 0.757 ppb |
| 2016-08-09 | AB85035TH | 0.738 ppb |
| 2016-08-09 | AB85033TH | 0.685 ppb |
| 2016-08-10 | AB85162TH | 0.820 ppb |
| 2016-11-18 | AB89580TH | 0.764 ppb |
| 2016-11-18 | AB89579TH | 0.675 ppb |
| 2016-11-18 | AB89582TH | 0.748 ppb |
| 2016-11-18 | AB89581TH | 0.671 ppb |
| 2017-02-14 | AB92824TH | 2.69 ppb |
| 2017-02-14 | AB92822TH | 2.96 ppb |
| 2017-02-14 | AB92825TH | 2.47 ppb |
| 2017-02-14 | AB92823TH | 2.79 ppb |
| 2017-05-09 | AB96263TH | 0.601 ppb |
| 2017-05-09 | AB96262TH | 0.508 ppb |
| 2017-05-09 | AB96260TH | ND |
| 2017-05-09 | AB96261TH | 0.518 ppb |
| 2017-08-08 | AB99832TH | 0.750 ppb |
| 2017-08-08 | AB99830TH | 0.840 ppb |
| 2017-08-08 | AB99831TH | 0.820 ppb |
| 2017-08-08 | AB99833TH | 0.910 ppb |
| 2017-11-14 | AC03855TH | ND |
| 2017-11-14 | AC03857TH | ND |
| 2017-11-14 | AC03856TH | ND |
| 2017-11-14 | AC03854TH | ND |
| 2018-02-13 | AC07353TH | 0.940 ppb |
| 2018-02-13 | AC07358TH | ND |
| 2018-02-13 | AC07351TH | 0.850 ppb |
| 2018-02-13 | AC07357TH | 0.926 ppb |
| 2018-05-21 | AC11148TH | ND |
| 2018-05-21 | AC11145TH | ND |
| 2018-05-21 | AC11147TH | ND |
| 2018-05-21 | AC11146TH | ND |
| 2018-08-14 | AC14839TH | ND |
| 2018-08-14 | AC14838TH | 0.535 ppb |
| 2018-08-14 | AC14840TH | ND |
| 2018-08-14 | AC14837TH | ND |
| 2018-11-13 | AC18763TH | ND |
| 2018-11-13 | AC18762TH | ND |
| 2018-11-13 | AC18764TH | ND |
| 2018-11-13 | AC18761TH | ND |
| 2019-02-13 | AC22611TH | ND |
| 2019-02-13 | AC22614TH | ND |
| 2019-02-13 | AC22612TH | ND |
| 2019-02-13 | AC22613TH | ND |
| 2019-05-15 | AC26659TH | ND |
| 2019-05-15 | AC26658TH | ND |
| 2019-05-15 | AC26656TH | ND |
| 2019-05-15 | AC26657TH | ND |
| 2019-08-12 | AC30633TH | 0.712 ppb |
| 2019-08-12 | AC30630TH | 0.570 ppb |
| 2019-08-12 | AC30631TH | 0.810 ppb |
| 2019-08-12 | AC30632TH | 0.546 ppb |
| 2019-11-13 | AC35149TH | ND |
| 2019-11-13 | AC35150TH | ND |
| 2019-11-13 | AC35151TH | ND |
| 2019-11-13 | AC35152TH | ND |