Know Your Environment. Protect Your Health.

Arsenic

Walnut Grove 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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND60ND
2020N/A00N/A
2021ND20ND
20220.180 ppb101ND - 1.80 ppb
2023ND80ND

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
2018-08-15292292-2018-DWIND
2018-10-16295670-2018-DWND
2019-02-26301436-2019-DWND
2019-02-26301437-2019-DWIND
2019-03-05301698-2019-DWND
2019-03-05301699-2019-DWIND
2019-03-12302100-2019-DWND
2019-03-12302099-2019-DWND
2021-07-217380944003ND
2021-09-077387721001ND
2022-03-08810-17505-1BND
2022-03-08810-17576-1BND
2022-03-08810-17573-1BND
2022-03-08810-17508-1BND
2022-03-09FWC0111AND
2022-03-09810-18451-1BND
2022-03-09810-18448-1AND
2022-03-14FWC0176-01I1.80 ppb
2022-03-23810-18980-1IND
2022-05-23FWE0087-01ND
2023-02-15FXB0429ND
2023-04-04FXC0506ND
2023-04-04FXC0515-01ND
2023-04-05FXC0491ND
2023-04-05FXC0541_01ND
2023-04-05FXC0549ND
2023-04-05FXC0552-01ND
2023-04-05FXC0558-01ND