EWG's Tap Water Database — 2019 UPDATE



Brigham City Water System

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.700 ppb330.500 ppb - 0.900 ppb
20140.700 ppb110.700 ppb
20151.000 ppb111.000 ppb
20160.700 ppb440.500 ppb - 1.000 ppb
20170.500 ppb110.500 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic 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 arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Result
2013-05-290.900 ppb
2013-05-290.500 ppb
2013-05-290.700 ppb
2014-01-230.700 ppb
2015-03-231.000 ppb
2016-03-230.700 ppb
2016-05-040.500 ppb
2016-06-090.600 ppb
2016-06-091.000 ppb
2017-02-230.500 ppb