Bromate

Town of Gilbert

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

125

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	1.37 ppb	21	15	ND - 3.70 ppb
2015	2.22 ppb	22	12	ND - 14.0 ppb
2016	3.32 ppb	21	20	ND - 15.0 ppb
2017	4.50 ppb	22	18	ND - 20.0 ppb
2018	4.68 ppb	20	19	ND - 11.0 ppb
2019	6.51 ppb	19	15	ND - 29.0 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
2014-01-21	201401210275	ND
2014-02-11	201402110325	1.20 ppb
2014-03-04	201403040332	ND
2014-04-21	201404220577	ND
2014-04-21	201404220674	1.30 ppb
2014-05-06	201405060551	1.90 ppb
2014-05-22	201405220486	ND
2014-06-03	201406030680	2.10 ppb
2014-06-03	201406030681	1.10 ppb
2014-07-14	201407140067	3.70 ppb
2014-07-22	201407220271	2.30 ppb
2014-08-12	201408120502	2.00 ppb
2014-08-12	201408120503	2.00 ppb
2014-09-02	201409020214	2.20 ppb
2014-09-02	201409020215	2.90 ppb
2014-10-07	201410070500	2.00 ppb
2014-10-30	201411030064	1.20 ppb
2014-11-11	201411010362	ND
2014-11-11	201411110363	1.70 ppb
2014-12-02	201412030209	ND
2014-12-02	201412030217	1.20 ppb
2015-01-06	201501060501	ND
2015-01-07	201501070405	1.40 ppb
2015-02-03	201502030348	ND
2015-03-11	201503110496	1.90 ppb
2015-03-11	201503110602	ND
2015-04-01	201504010564	ND
2015-04-01	201504010565	ND
2015-05-06	201505060425	5.00 ppb
2015-05-06	201505060431	ND
2015-06-03	201506030367	14.0 ppb
2015-06-03	201506030389	2.80 ppb
2015-07-01	201507010421	ND
2015-07-01	201507010423	3.20 ppb
2015-08-05	201508050369	2.60 ppb
2015-08-05	201508050382	1.000 ppb
2015-09-02	201509020293	ND
2015-09-02	201509020294	3.00 ppb
2015-10-07	201510070448	ND
2015-10-07	201510070460	5.60 ppb
2015-11-04	201511040188	5.50 ppb
2015-11-04	201511040189	2.90 ppb
2015-12-02	201512020559	ND
2016-01-06	201601070016	1.10 ppb
2016-02-11	201602110196	1.20 ppb
2016-03-02	201603020438	1.80 ppb
2016-04-06	201604060432	15.0 ppb
2016-04-06	201604060434	2.60 ppb
2016-05-04	201605040426	3.50 ppb
2016-05-04	201605040427	2.20 ppb
2016-06-01	201606010681	7.20 ppb
2016-06-01	201606010683	2.00 ppb
2016-07-06	201607060611	4.60 ppb
2016-07-06	201607060619	1.20 ppb
2016-08-03	201608030433	2.40 ppb
2016-08-03	201608030444	1.80 ppb
2016-09-07	201609070498	5.00 ppb
2016-09-07	201609070499	1.70 ppb
2016-10-05	201610050247	1.70 ppb
2016-10-05	201610050424	8.10 ppb
2016-11-02	201611020378	2.80 ppb
2016-11-16	201611160195	2.00 ppb
2016-12-07	201612070580	1.90 ppb
2016-12-28	201612280330	ND
2017-01-04	201701040809	1.70 ppb
2017-01-04	201701040814	ND
2017-02-01	201702010350	2.80 ppb
2017-03-01	201703010296	ND
2017-03-29	201703290515	2.00 ppb
2017-04-05	201704050646	ND
2017-04-11	201704050632	4.30 ppb
2017-05-01	201705010488	7.10 ppb
2017-05-01	201705010510	2.50 ppb
2017-06-06	201706060721	12.0 ppb
2017-06-06	201706060723	2.30 ppb
2017-07-06	201707060574	20.0 ppb
2017-07-06	201707060588	1.40 ppb
2017-08-01	201708010729	17.0 ppb
2017-08-08	201708010731	2.00 ppb
2017-09-14	201709140737	7.70 ppb
2017-09-14	201709140739	2.30 ppb
2017-10-04	201710040626	4.80 ppb
2017-10-04	201710040627	2.70 ppb
2017-11-02	201711020439	ND
2017-11-29	201711290383	3.40 ppb
2017-12-06	201712060282	2.90 ppb
2018-01-16	201801160451	2.30 ppb
2018-02-26	201802260209	ND
2018-03-21	201803210468	2.60 ppb
2018-04-17	201804170340	3.00 ppb
2018-04-17	201804170349	3.80 ppb
2018-05-17	201805170719	2.30 ppb
2018-05-17	201805170724	6.40 ppb
2018-06-13	201806131016	3.50 ppb
2018-06-13	201806131017	8.40 ppb
2018-07-17	201807170497	7.60 ppb
2018-07-17	201807170506	6.20 ppb
2018-08-01	201808010276	2.90 ppb
2018-08-01	201808010282	3.30 ppb
2018-09-12	201809120745	3.70 ppb
2018-09-12	201809120746	7.80 ppb
2018-10-16	201810160446	11.0 ppb
2018-10-16	201810160449	8.00 ppb
2018-11-06	201811070807	5.00 ppb
2018-11-26	201811260253	3.60 ppb
2018-12-17	201812170261	2.10 ppb
2019-01-15	20191150222	1.40 ppb
2019-03-05	201903050207	ND
2019-04-16	201904160423	1.60 ppb
2019-05-20	201905200115	ND
2019-05-28	201905290275	2.30 ppb
2019-06-03	201906040170	ND
2019-06-03	201906040179	2.10 ppb
2019-07-01	201907020233	ND
2019-07-01	201907020235	4.90 ppb
2019-08-06	201908060360	14.0 ppb
2019-08-06	201908060361	6.90 ppb
2019-09-03	201909040349	21.0 ppb
2019-09-04	201909040351	5.50 ppb
2019-10-02	201910020476	6.00 ppb
2019-10-02	2019120020475	29.0 ppb
2019-11-05	201911051040	7.90 ppb
2019-11-05	201911051041	4.00 ppb
2019-12-10	201912160220	5.10 ppb
2019-12-16	201912160221	12.0 ppb