Know Your Environment. Protect Your Health.

Arsenic

Joshua Basin Water District

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.667 ppb31ND - 2.00 ppb
20191.90 ppb21ND - 3.80 ppb
2020ND40ND
2021N/A00N/A
2022N/A00N/A
20232.28 ppb43ND - 4.90 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
2018-05-10CA3610025_008_008-201805100600ND
2018-11-05CA3610025_009_009-2018110505302.00 ppb
2018-11-05CA3610025_005_005-201811050500ND
2019-02-11CA3610025_010_010-201902110730ND
2019-02-11CA3610025_011_011-2019021108153.80 ppb
2020-11-17CA3610025_010_010-202011171000ND
2020-11-17CA3610025_011_011-202011170930ND
2020-11-17CA3610025_005_005-202011170730ND
2020-11-17CA3610025_009_009-202011170800ND
2023-11-07CA3610025_005_005-2023110706312.10 ppb
2023-11-07CA3610025_010_010-202311070710ND
2023-11-07CA3610025_009_009-2023110708282.10 ppb
2023-11-07CA3610025_011_011-2023110709284.90 ppb