Know Your Environment. Protect Your Health.

Arsenic

Clark Public Utilities

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20193.30 ppb223.00 ppb - 3.60 ppb
2020N/A00N/A
2021ND40ND
20220.641 ppb174ND - 3.80 ppb
20231.98 ppb43ND - 3.50 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
2019-04-023.60 ppb
2019-05-163.00 ppb
2021-06-294136309ND
2021-06-294136308ND
2021-08-024167408ND
2021-08-024171193ND
2022-03-3142663253.80 ppb
2022-07-074329452ND
2022-07-074329453ND
2022-07-074329454ND
2022-07-2843284911.70 ppb
2022-07-2843284821.70 ppb
2022-07-284329448ND
2022-08-034328481ND
2022-08-034329441ND
2022-08-034328492ND
2022-08-034329440ND
2022-08-044328483ND
2022-08-0443294613.70 ppb
2022-08-044329471ND
2022-08-044329468ND
2022-08-044328488ND
2022-08-164364181ND
2023-04-0644396823.50 ppb
2023-06-014474461ND
2023-09-1945319832.20 ppb
2023-09-1945318632.20 ppb