Know Your Environment. Protect Your Health.

Arsenic

Ward II 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.

 

52

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.154 ppb262ND - 2.00 ppb
2019ND40ND
2020ND20ND
20210.157 ppb142ND - 1.20 ppb
2022ND10ND
2023ND50ND

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
2018-05-02AE21727ND
2018-05-02AE21703ND
2018-05-02AE21727ND
2018-05-02AE21703ND
2018-06-06AE21818ND
2018-06-06AE21815ND
2018-06-06AE21812ND
2018-06-06AE21809ND
2018-06-06AE21812ND
2018-06-06AE21815ND
2018-06-06AE21818ND
2018-06-06AE21821ND
2018-06-06AE21809ND
2018-06-06AE21821ND
2018-06-25AE21992ND
2018-06-25AE22000ND
2018-06-25AE21996ND
2018-06-25AE21992ND
2018-06-25AE21988ND
2018-06-25AE219842.00 ppb
2018-06-25AE219842.00 ppb
2018-06-25AE22000ND
2018-06-25AE21996ND
2018-06-25AE21988ND
2018-09-10B1804157-001ND
2018-09-10B1804157-001ND
2019-07-24B1903193-001ND
2019-07-2435485209001ND
2019-07-2435485209001ND
2019-07-24B1903193-001ND
2020-06-23B2003030-001ND
2020-06-23B2003030-002ND
2021-03-29B2101469-003ND
2021-03-29B2101469-002ND
2021-03-29B2101469-001ND
2021-06-14B2102705-002ND
2021-06-14B2102705-005ND
2021-06-14B2102705-004ND
2021-06-14B2102705-0031.20 ppb
2021-06-14B2102705-001ND
2021-06-28B2103005-006ND
2021-06-28B2103005-005ND
2021-06-28B2103005-004ND
2021-06-28B2103003-0031.000 ppb
2021-06-28B2103003-002ND
2021-06-28B2103003-001ND
2022-08-22B2203975-001ND
2023-05-08B2301971-001ND
2023-05-08B2301971-002ND
2023-05-08B2301971-003ND
2023-05-08B2301971-004ND
2023-05-08B2301971-005ND