Bromoform
North Wales Water 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.
215
Samples
0
Samples exceeding legal limit (MCL)
45
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.171 ppb | 37 | 5 | ND - 1.45 ppb |
| 2015 | 0.167 ppb | 27 | 6 | ND - 1.14 ppb |
| 2016 | 0.421 ppb | 36 | 17 | ND - 2.80 ppb |
| 2017 | 0.0623 ppb | 44 | 5 | ND - 0.628 ppb |
| 2018 | 0.177 ppb | 35 | 7 | ND - 1.86 ppb |
| 2019 | 0.178 ppb | 36 | 9 | ND - 1.70 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 |
|---|---|---|
| 2014-02-12 | 20140557 | ND |
| 2014-02-12 | 20140558 | ND |
| 2014-02-12 | 20140559 | ND |
| 2014-02-12 | 20140560 | ND |
| 2014-02-12 | 20140561 | ND |
| 2014-02-12 | 20140562 | ND |
| 2014-02-12 | 20140563 | ND |
| 2014-02-12 | 20140564 | ND |
| 2014-02-17 | 20140576 | ND |
| 2014-02-17 | 20140577 | ND |
| 2014-03-04 | 20140745 | ND |
| 2014-05-13 | 20141613 | ND |
| 2014-05-13 | 20141614 | ND |
| 2014-05-13 | 20141615 | ND |
| 2014-05-13 | 20141616 | ND |
| 2014-05-13 | 20141617 | ND |
| 2014-05-13 | 20141618 | ND |
| 2014-05-13 | 20141619 | ND |
| 2014-05-13 | 20141620 | ND |
| 2014-06-10 | 20141963 | ND |
| 2014-08-05 | 20142640 | ND |
| 2014-08-12 | 20142741 | ND |
| 2014-08-12 | 20142742 | ND |
| 2014-08-12 | 20142743 | ND |
| 2014-08-12 | 20142744 | ND |
| 2014-08-12 | 20142745 | ND |
| 2014-08-12 | 20142746 | 1.36 ppb |
| 2014-08-12 | 20142747 | 1.45 ppb |
| 2014-08-12 | 20142748 | ND |
| 2014-11-11 | 14111187-01 | ND |
| 2014-11-11 | 14111187-02 | ND |
| 2014-11-11 | 14111187-03 | ND |
| 2014-11-11 | 14111187-04 | 1.000 ppb |
| 2014-11-11 | 14111187-05 | ND |
| 2014-11-11 | 14111187-06 | 1.20 ppb |
| 2014-11-11 | 14111187-07 | 1.30 ppb |
| 2014-11-11 | 14111187-08 | ND |
| 2015-02-10 | 12403027 | ND |
| 2015-02-10 | 12403032 | ND |
| 2015-02-10 | 12403037 | ND |
| 2015-02-10 | 12403042 | ND |
| 2015-02-10 | 12403047 | ND |
| 2015-02-10 | 12403052 | ND |
| 2015-02-10 | 12403057 | ND |
| 2015-02-10 | 12403062 | ND |
| 2015-03-10 | 12516879 | ND |
| 2015-08-11 | 13136889 | 0.535 ppb |
| 2015-08-11 | 13136894 | 0.537 ppb |
| 2015-08-11 | 13136899 | ND |
| 2015-08-11 | 13136904 | ND |
| 2015-08-11 | 13136909 | ND |
| 2015-08-11 | 13136914 | 1.14 ppb |
| 2015-08-11 | 13136919 | 0.934 ppb |
| 2015-08-11 | 13136924 | ND |
| 2015-09-14 | 13265901 | ND |
| 2015-11-11 | 13515287 | ND |
| 2015-11-11 | 13515292 | ND |
| 2015-11-11 | 13515297 | ND |
| 2015-11-11 | 13515302 | ND |
| 2015-11-11 | 13515307 | ND |
| 2015-11-11 | 13515312 | 0.753 ppb |
| 2015-11-11 | 13515317 | 0.622 ppb |
| 2015-11-11 | 13515322 | ND |
| 2015-12-01 | 13634684 | ND |
| 2016-02-10 | 13871417 | ND |
| 2016-02-10 | 13871422 | ND |
| 2016-02-10 | 13871427 | ND |
| 2016-02-10 | 13871432 | ND |
| 2016-02-10 | 13871437 | ND |
| 2016-02-10 | 13871442 | 1.15 ppb |
| 2016-02-10 | 13871447 | ND |
| 2016-02-10 | 13871452 | ND |
| 2016-03-07 | 13987509 | ND |
| 2016-05-11 | 14252422 | ND |
| 2016-05-11 | 14252428 | ND |
| 2016-05-11 | 14252434 | ND |
| 2016-05-11 | 14252440 | ND |
| 2016-05-11 | 14252446 | ND |
| 2016-05-11 | 14252452 | 1.30 ppb |
| 2016-05-11 | 14252458 | 0.600 ppb |
| 2016-05-11 | 14252464 | ND |
| 2016-06-07 | 14407390 | ND |
| 2016-06-29 | 14407417 | ND |
| 2016-08-10 | 14737311 | 0.700 ppb |
| 2016-08-10 | 14737317 | 0.700 ppb |
| 2016-08-10 | 14737323 | 0.500 ppb |
| 2016-08-10 | 14737329 | ND |
| 2016-08-10 | 14737335 | 0.600 ppb |
| 2016-08-10 | 14737341 | 2.80 ppb |
| 2016-08-10 | 14737347 | 1.20 ppb |
| 2016-08-10 | 14737353 | ND |
| 2016-09-06 | 14909866 | ND |
| 2016-11-09 | 15227771 | 0.700 ppb |
| 2016-11-09 | 15227777 | 0.700 ppb |
| 2016-11-09 | 15227783 | 0.600 ppb |
| 2016-11-09 | 15227789 | 0.500 ppb |
| 2016-11-09 | 15227795 | 0.600 ppb |
| 2016-11-09 | 15227801 | 1.40 ppb |
| 2016-11-09 | 15227807 | 0.600 ppb |
| 2016-11-09 | 15227813 | 0.500 ppb |
| 2017-02-08 | 15657190 | ND |
| 2017-02-08 | 15657196 | ND |
| 2017-02-08 | 15657202 | ND |
| 2017-02-08 | 15657208 | ND |
| 2017-02-08 | 15657214 | ND |
| 2017-02-08 | 15657220 | ND |
| 2017-02-08 | 15657226 | ND |
| 2017-02-08 | 15657232 | ND |
| 2017-03-16 | 15797877 | ND |
| 2017-05-10 | 16096467 | ND |
| 2017-05-10 | 16096473 | ND |
| 2017-05-10 | 16096479 | ND |
| 2017-05-10 | 16096485 | ND |
| 2017-05-10 | 16096491 | ND |
| 2017-05-10 | 16096497 | ND |
| 2017-05-10 | 16096503 | ND |
| 2017-05-10 | 16096509 | ND |
| 2017-06-06 | 16259068 | ND |
| 2017-08-09 | 16568086 | 0.526 ppb |
| 2017-08-09 | 16567864 | ND |
| 2017-08-09 | 16568092 | ND |
| 2017-08-09 | 16567869 | ND |
| 2017-08-09 | 16568098 | ND |
| 2017-08-09 | 16567874 | ND |
| 2017-08-09 | 16568104 | ND |
| 2017-08-09 | 16567879 | ND |
| 2017-08-09 | 16568110 | ND |
| 2017-08-09 | 16567884 | ND |
| 2017-08-09 | 16568116 | 0.628 ppb |
| 2017-08-09 | 16567889 | 0.500 ppb |
| 2017-08-09 | 16568122 | ND |
| 2017-08-09 | 16567894 | ND |
| 2017-08-09 | 16568128 | ND |
| 2017-08-09 | 16567899 | ND |
| 2017-09-05 | 16728668 | ND |
| 2017-11-13 | 17024972 | 0.557 ppb |
| 2017-11-13 | 17024978 | 0.528 ppb |
| 2017-11-13 | 17024984 | ND |
| 2017-11-13 | 17024990 | ND |
| 2017-11-13 | 17024996 | ND |
| 2017-11-13 | 17025002 | ND |
| 2017-11-13 | 17025008 | ND |
| 2017-11-13 | 17025014 | ND |
| 2017-12-05 | 17163830 | ND |
| 2018-02-12 | 20180597 | ND |
| 2018-02-12 | 20180598 | ND |
| 2018-02-12 | 20180599 | ND |
| 2018-02-12 | 20180600 | ND |
| 2018-02-12 | 20180601 | ND |
| 2018-02-12 | 20180602 | ND |
| 2018-02-12 | 20180603 | ND |
| 2018-02-12 | 20180604 | ND |
| 2018-03-13 | 20180956 | ND |
| 2018-05-14 | 20181890 | ND |
| 2018-05-14 | 20181891 | 0.537 ppb |
| 2018-05-14 | 20181892 | ND |
| 2018-05-14 | 20181893 | ND |
| 2018-05-14 | 20181894 | ND |
| 2018-05-14 | 20181895 | 0.506 ppb |
| 2018-05-14 | 20181896 | ND |
| 2018-05-14 | 20181897 | ND |
| 2018-06-05 | 20182148 | ND |
| 2018-08-13 | 20183097 | 0.726 ppb |
| 2018-08-13 | 20183098 | 0.770 ppb |
| 2018-08-13 | 20183099 | ND |
| 2018-08-13 | 20183100 | ND |
| 2018-08-13 | 20183101 | 0.710 ppb |
| 2018-08-13 | 20183102 | 1.86 ppb |
| 2018-08-13 | 20183103 | 1.08 ppb |
| 2018-08-13 | 20183104 | ND |
| 2018-09-04 | 20183373 | ND |
| 2018-11-12 | 8113026-01 | ND |
| 2018-11-12 | 8113026-02 | ND |
| 2018-11-12 | 8113026-03 | ND |
| 2018-11-12 | 8113026-04 | ND |
| 2018-11-12 | 8113026-05 | ND |
| 2018-11-12 | 8113026-06 | ND |
| 2018-11-12 | 8113026-07 | ND |
| 2018-11-12 | 8113026-08 | ND |
| 2019-02-11 | 20190552 | ND |
| 2019-02-11 | 20190553 | ND |
| 2019-02-11 | 20190554 | ND |
| 2019-02-11 | 20190555 | ND |
| 2019-02-11 | 20190556 | ND |
| 2019-02-11 | 20190557 | ND |
| 2019-02-11 | 20190558 | ND |
| 2019-02-11 | 20190559 | ND |
| 2019-03-05 | 20190857 | ND |
| 2019-05-13 | 20191796 | ND |
| 2019-05-13 | 20191797 | 0.507 ppb |
| 2019-05-13 | 20191798 | ND |
| 2019-05-13 | 20191799 | ND |
| 2019-05-13 | 20191800 | ND |
| 2019-05-13 | 20191801 | 0.529 ppb |
| 2019-05-13 | 20191802 | 0.522 ppb |
| 2019-05-13 | 20191803 | ND |
| 2019-08-13 | 9083732-01 | ND |
| 2019-08-13 | 9083732-02 | ND |
| 2019-08-13 | 9083732-03 | ND |
| 2019-08-13 | 9083732-04 | ND |
| 2019-08-13 | 9083732-05 | ND |
| 2019-08-13 | 9083732-06 | 1.70 ppb |
| 2019-08-13 | 9083732-07RE | ND |
| 2019-08-13 | 9083732-08 | ND |
| 2019-09-03 | 20193443 | ND |
| 2019-11-11 | 9113440-01 | ND |
| 2019-11-11 | 20194418 | 0.537 ppb |
| 2019-11-11 | 20194419 | 0.540 ppb |
| 2019-11-11 | 20194420 | ND |
| 2019-11-11 | 20194422 | 0.513 ppb |
| 2019-11-11 | 20194423 | 0.866 ppb |
| 2019-11-11 | 20194424 | 0.680 ppb |
| 2019-11-11 | 20194425 | ND |
| 2019-12-03 | 9121679-01 | ND |
| 2019-12-03 | 20194748 | ND |