Know Your Environment. Protect Your Health.

Arsenic

Utrwd Regional Water Treatment Plant

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
20200.550 ppb21ND - 1.10 ppb
2021ND20ND
2022ND20ND
20230.750 ppb21ND - 1.50 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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 Lab ID Result
2018-02-13Q1805957002ND
2018-09-25Q1838256002ND
2019-03-07Q1909910003ND
2019-10-02Q1971112002ND
2020-03-09Q2008448002ND
2020-08-18Q20328590071.10 ppb
2021-02-23Q2104596002ND
2021-09-27Q2126305007ND
2022-01-25Q2202436002ND
2022-09-15Q2227673009ND
2023-03-07Q2308901003ND
2023-08-02Q23314450071.50 ppb