Know Your Environment. Protect Your Health.

Bromate

City of Tacoma

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.

 

53

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND110ND
2019ND100ND
2020N/A00N/A
20210.300 ppb111ND - 3.30 ppb
2022ND90ND
2023ND120ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-01-09ND
2018-02-06ND
2018-03-06ND
2018-04-03ND
2018-05-01ND
2018-07-10ND
2018-08-14ND
2018-09-04ND
2018-10-02ND
2018-11-13ND
2018-12-11ND
2019-01-08ND
2019-02-05ND
2019-03-05ND
2019-04-02ND
2019-05-14ND
2019-06-11ND
2019-08-13ND
2019-09-10ND
2019-10-01ND
2019-11-12ND
2021-01-194062987ND
2021-02-094074100ND
2021-03-094087496ND
2021-04-064102540ND
2021-05-044114186ND
2021-06-014125349ND
2021-08-034149761ND
2021-09-074200257ND
2021-10-054192254ND
2021-11-024203692ND
2021-12-2142175803.30 ppb
2022-03-084258880ND
2022-04-054274925ND
2022-05-034282286ND
2022-06-074299762ND
2022-07-054319968ND
2022-08-024333321ND
2022-09-064336672ND
2022-10-044361788ND
2022-11-084375291ND
2023-01-104402382ND
2023-02-074411933ND
2023-03-074425690ND
2023-04-044444811ND
2023-05-024452864ND
2023-06-064468513ND
2023-07-114483429ND
2023-08-084507526ND
2023-09-054516092ND
2023-10-114563177ND
2023-11-074543458ND
2023-12-054558816ND