Bromoform
Westerville City PWS
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.
106
Samples
0
Samples exceeding legal limit (MCL)
80
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 | 0.666 ppb | 17 | 13 | ND - 1.10 ppb |
| 2015 | 0.477 ppb | 20 | 10 | ND - 1.80 ppb |
| 2016 | 1.40 ppb | 20 | 15 | ND - 3.35 ppb |
| 2017 | 1.46 ppb | 17 | 17 | 0.660 ppb - 3.03 ppb |
| 2018 | 0.859 ppb | 18 | 13 | ND - 1.54 ppb |
| 2019 | 1.05 ppb | 14 | 12 | ND - 2.20 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 | A140111815 | 0.810 ppb |
| 2014-02-11 | A140111816 | 0.670 ppb |
| 2014-02-11 | A140111817 | 0.700 ppb |
| 2014-02-11 | A140111818 | 0.890 ppb |
| 2014-04-01 | 14D0079-01 | 0.780 ppb |
| 2014-05-13 | A140191074 | 0.990 ppb |
| 2014-05-13 | A140191075 | 0.960 ppb |
| 2014-05-13 | A140191076 | 0.750 ppb |
| 2014-05-13 | A140191077 | 1.10 ppb |
| 2014-08-12 | A140216858 | 1.000 ppb |
| 2014-08-12 | A140216861 | 0.950 ppb |
| 2014-08-12 | A140216859 | 1.000 ppb |
| 2014-08-12 | A140216860 | 0.720 ppb |
| 2014-11-12 | A140217533 | ND |
| 2014-11-12 | A140217534 | ND |
| 2014-11-12 | A140217535 | ND |
| 2014-11-12 | A140217536 | ND |
| 2015-02-11 | 15021148-001 | 1.44 ppb |
| 2015-02-11 | 15021148-002 | 1.57 ppb |
| 2015-02-11 | 15021148-003 | 0.827 ppb |
| 2015-02-11 | 15021148-004 | 1.80 ppb |
| 2015-02-11 | 15021148-005 | ND |
| 2015-05-20 | 05052531-005 | ND |
| 2015-05-20 | 15052531-001 | 0.570 ppb |
| 2015-05-20 | 15052531-002 | 0.570 ppb |
| 2015-05-20 | 15052531-003 | ND |
| 2015-05-20 | 15052531-004 | 0.650 ppb |
| 2015-05-20 | 15052531-005 | ND |
| 2015-08-12 | 15081510-001 | ND |
| 2015-08-12 | 15081510-002 | 0.790 ppb |
| 2015-08-12 | 15081510-003 | 0.520 ppb |
| 2015-08-12 | 15081510-004 | 0.800 ppb |
| 2015-08-12 | 15081510-005 | ND |
| 2015-11-12 | 15110966-001A | ND |
| 2015-11-12 | 15110966-002A | ND |
| 2015-11-12 | 15110966-003A | ND |
| 2015-11-12 | 15110966-004A | ND |
| 2016-02-11 | A160338322 | ND |
| 2016-02-11 | A160338323 | ND |
| 2016-02-11 | A160338324 | ND |
| 2016-02-11 | A160338325 | ND |
| 2016-02-11 | A160338326 | ND |
| 2016-05-11 | A160375106 | 1.47 ppb |
| 2016-05-11 | A160375107 | 1.32 ppb |
| 2016-05-11 | A160375112 | 1.73 ppb |
| 2016-05-11 | A160375113 | 1.30 ppb |
| 2016-05-11 | A160375115 | 1.51 ppb |
| 2016-08-10 | A160427284 | 3.05 ppb |
| 2016-08-10 | A160427285 | 2.72 ppb |
| 2016-08-10 | A160427286 | 3.35 ppb |
| 2016-08-10 | A160427287 | 2.06 ppb |
| 2016-08-10 | A160427290 | 3.22 ppb |
| 2016-11-09 | A160453289 | 1.34 ppb |
| 2016-11-09 | A160453290 | 1.47 ppb |
| 2016-11-09 | A160453291 | 1.07 ppb |
| 2016-11-09 | A160453292 | 1.47 ppb |
| 2016-11-09 | A160453293 | 0.850 ppb |
| 2017-02-08 | 17B0545-01 | 0.990 ppb |
| 2017-02-08 | 17B0545-02 | 1.04 ppb |
| 2017-02-08 | 17B0545-03 | 0.970 ppb |
| 2017-02-08 | 17B0545-04 | 1.10 ppb |
| 2017-03-01 | 17C0187-01 | 0.870 ppb |
| 2017-05-10 | 17E0742-01 | 0.890 ppb |
| 2017-05-10 | 17E0742-02 | 1.13 ppb |
| 2017-05-10 | 17E0742-03 | 0.660 ppb |
| 2017-05-10 | 17E0742-04 | 1.20 ppb |
| 2017-08-09 | 17H0722-01 | 2.73 ppb |
| 2017-08-09 | 17H0722-02 | 2.52 ppb |
| 2017-08-09 | 17H0722-03 | 3.03 ppb |
| 2017-08-09 | 17H0722-04 | 2.91 ppb |
| 2017-11-08 | 17K0722-01 | 1.27 ppb |
| 2017-11-08 | 17K0722-02 | 1.23 ppb |
| 2017-11-08 | 17K0722-03 | 1.03 ppb |
| 2017-11-08 | 17K0722-04 | 1.32 ppb |
| 2018-01-22 | 18A1392-01 | 1.46 ppb |
| 2018-02-08 | 18B0492-01 | 1.25 ppb |
| 2018-02-08 | 18B0492-02 | 1.20 ppb |
| 2018-02-08 | 18B0492-03 | 1.05 ppb |
| 2018-02-08 | 18B0492-04 | 1.25 ppb |
| 2018-05-09 | 18E0775-01 | 0.910 ppb |
| 2018-05-09 | 18E0775-02 | ND |
| 2018-05-09 | 18E0775-03 | 0.790 ppb |
| 2018-05-09 | 18E0775-04 | 0.990 ppb |
| 2018-08-08 | 18H0652-05 | 1.06 ppb |
| 2018-08-08 | 18H0652-01 | 1.40 ppb |
| 2018-08-08 | 18H0652-02 | 1.29 ppb |
| 2018-08-08 | 18H0652-03 | 1.28 ppb |
| 2018-08-08 | 18H0652-04 | 1.54 ppb |
| 2018-11-13 | 521718001 | ND |
| 2018-11-13 | 521718002 | ND |
| 2018-11-13 | 521718003 | ND |
| 2018-11-13 | 521718004 | ND |
| 2019-01-02 | 524624001 | ND |
| 2019-02-11 | 527187002 | 2.20 ppb |
| 2019-02-11 | 527187003 | 1.90 ppb |
| 2019-02-11 | 527187004 | 1.70 ppb |
| 2019-02-11 | 527187005 | 1.90 ppb |
| 2019-05-08 | 5213441001 | ND |
| 2019-05-08 | 5213441002 | 0.780 ppb |
| 2019-05-08 | 5213441003 | 0.950 ppb |
| 2019-05-08 | 5213441004 | 0.640 ppb |
| 2019-05-08 | 5213441005 | 0.980 ppb |
| 2019-08-12 | 5220715002 | 0.910 ppb |
| 2019-08-12 | 5220715003 | 0.960 ppb |
| 2019-08-12 | 5220715004 | 0.860 ppb |
| 2019-08-12 | 5220715005 | 0.960 ppb |