Bromate

City of Denton

Bromate is a carcinogenic disinfection byproduct formed when source waters containing bromide are treated with ozonation or sodium hypochlorite. Studies of laboratory animals show that bromate damages DNA and causes cancer in multiple organs. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

141

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	0.230 ppb	23	1	ND - 5.30 ppb
2015	1.30 ppb	23	18	ND - 2.30 ppb
2016	1.37 ppb	24	17	ND - 3.70 ppb
2017	2.00 ppb	24	19	ND - 6.40 ppb
2018	1.59 ppb	24	18	ND - 3.90 ppb
2019	1.98 ppb	23	18	ND - 4.50 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for bromate was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 10 ppb

The legal limit for bromate, established in 1998, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to bromate exposure.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-06	201401090604	ND
2014-02-03	201402060461	ND
2014-02-03	201402060459	ND
2014-03-03	201403060184	ND
2014-03-03	201403060182	ND
2014-04-07	201404090807	ND
2014-04-07	201404090805	ND
2014-05-05	201405070132	ND
2014-05-05	201405070130	ND
2014-06-02	201406040238	ND
2014-06-02	201406040240	ND
2014-07-09	201407150223	ND
2014-07-14	201407150222	ND
2014-08-04	201408060143	ND
2014-08-04	201408060144	ND
2014-09-08	201409130166	ND
2014-09-08	201409130164	ND
2014-10-06	201410080299	ND
2014-10-06	201410080297	ND
2014-11-03	201411050650	ND
2014-11-03	201411050648	5.30 ppb
2014-12-01	201412040394	ND
2014-12-01	201412040396	ND
2015-01-14	201501070053	1.60 ppb
2015-01-15	201501070055	1.40 ppb
2015-02-02	201502100211	ND
2015-02-02	201502100209	1.90 ppb
2015-03-04	201503040166	1.70 ppb
2015-04-08	201504080723	2.00 ppb
2015-04-08	201504080725	1.000 ppb
2015-05-06	201505060064	1.90 ppb
2015-05-06	201505060066	2.20 ppb
2015-06-01	201506040558	ND
2015-06-08	201506100054	1.30 ppb
2015-07-15	201507150217	1.50 ppb
2015-07-15	201507150216	1.10 ppb
2015-08-03	201508110053	1.30 ppb
2015-08-03	201508110051	2.30 ppb
2015-09-14	201509160764	ND
2015-09-14	201509160762	1.80 ppb
2015-10-08	201510080054	1.20 ppb
2015-10-08	201510080052	2.30 ppb
2015-11-12	201511040697	ND
2015-11-12	201511040695	1.80 ppb
2015-12-07	201512100045	1.60 ppb
2015-12-07	201512100047	ND
2016-01-04	201601060026	1.90 ppb
2016-01-04	201601060028	ND
2016-02-01	20160203583	1.30 ppb
2016-02-01	201602030585	ND
2016-03-07	201603100410	1.10 ppb
2016-03-07	201603100408	2.30 ppb
2016-04-12	201604120027	1.30 ppb
2016-04-12	201604120025	2.20 ppb
2016-05-02	201605040591	3.20 ppb
2016-05-02	201605040593	ND
2016-06-06	201606080407	1.70 ppb
2016-06-06	201606080409	ND
2016-07-13	20160607140545	3.20 ppb
2016-07-13	201607140547	1.000 ppb
2016-08-03	201608030668	2.30 ppb
2016-08-03	201608030670	1.30 ppb
2016-09-14	201609140102	3.70 ppb
2016-09-14	201609140104	1.10 ppb
2016-10-03	201610050098	ND
2016-10-03	201610050096	2.30 ppb
2016-11-10	201611100641	1.30 ppb
2016-11-10	201611100639	1.70 ppb
2016-12-12	201612140666	ND
2016-12-12	201612140668	ND
2017-01-11	201701111529	1.40 ppb
2017-01-11	201701111527	2.10 ppb
2017-02-08	201702091119	2.20 ppb
2017-02-08	201702091121	1.10 ppb
2017-03-08	201703080221	1.20 ppb
2017-03-08	201703080219	1.90 ppb
2017-04-07	201704070247	2.70 ppb
2017-04-07	201704070249	6.40 ppb
2017-05-10	201705100348	2.10 ppb
2017-05-10	201705100350	1.40 ppb
2017-06-12	201706140120	ND
2017-06-12	201706140118	2.60 ppb
2017-07-10	201707120723	ND
2017-07-10	201707120721	3.50 ppb
2017-08-07	201708090946	5.20 ppb
2017-08-07	201708090948	ND
2017-09-11	201709141110	ND
2017-09-11	201709141108	2.70 ppb
2017-10-02	201710040446	3.10 ppb
2017-10-02	201710040448	ND
2017-11-06	201711080291	3.00 ppb
2017-11-06	201711080293	1.000 ppb
2017-12-07	201712070279	2.60 ppb
2017-12-07	201712070281	1.90 ppb
2018-01-08	201801100183	2.50 ppb
2018-01-08	201801100185	1.60 ppb
2018-02-05	201802080878	ND
2018-02-05	201802080876	1.80 ppb
2018-03-05	201803080710	1.30 ppb
2018-03-05	201803080708	1.90 ppb
2018-04-02	201804040850	1.60 ppb
2018-04-02	20104040848	1.60 ppb
2018-05-07	201805110294	3.90 ppb
2018-05-07	201805110292	2.30 ppb
2018-06-04	201806070876	1.30 ppb
2018-06-04	201806070874	2.60 ppb
2018-07-09	201807121169	ND
2018-07-09	201807121167	2.50 ppb
2018-08-06	201808140242	ND
2018-08-09	201808140241	3.00 ppb
2018-09-10	201809120976	ND
2018-09-10	201809120974	3.50 ppb
2018-10-01	201810040965	2.30 ppb
2018-10-09	201810040967	1.10 ppb
2018-11-05	201811080519	1.40 ppb
2018-11-05	201811080521	ND
2018-12-03	201812060691	ND
2018-12-03	201812060689	1.90 ppb
2019-01-07	201901170302	1.70 ppb
2019-01-15	201901170304	3.70 ppb
2019-02-04	201902060555	1.30 ppb
2019-02-04	201902060557	1.90 ppb
2019-03-04	201903120426	1.30 ppb
2019-03-04	201903120424	2.10 ppb
2019-04-01	201904030425	2.70 ppb
2019-04-01	201904030427	2.60 ppb
2019-05-06	201905090010	ND
2019-05-06	201905090008	2.50 ppb
2019-06-03	201906050132	1.10 ppb
2019-06-03	201906050130	4.50 ppb
2019-07-08	201907100411	3.80 ppb
2019-07-08	201907100413	1.000 ppb
2019-08-05	201908081259	2.60 ppb
2019-08-05	201908081261	ND
2019-09-09	201909120126	ND
2019-09-09	201909120124	3.30 ppb
2019-10-07	201910100760	3.30 ppb
2019-10-08	201910100762	ND
2019-11-04	201911070781	1.80 ppb
2019-12-02	201912110851	ND
2019-12-02	201912110849	4.40 ppb