Know Your Environment. Protect Your Health.

Arsenic

Southwood Water System

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.14 ppb73ND - 4.40 ppb
20191.23 ppb75ND - 2.30 ppb
2020N/A00N/A
20211.06 ppb145ND - 4.70 ppb
20221.23 ppb106ND - 4.00 ppb
2023N/A00N/A

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
2018-01-232.00 ppb
2018-02-02ND
2018-04-05ND
2018-05-04ND
2018-05-091.60 ppb
2018-07-19ND
2018-10-054.40 ppb
2019-01-28ND
2019-01-28ND
2019-01-282.30 ppb
2019-01-281.50 ppb
2019-01-281.80 ppb
2019-02-081.50 ppb
2019-07-121.50 ppb
2021-03-1740937741.80 ppb
2021-03-1740969982.70 ppb
2021-03-184464988ND
2021-03-1844650764.70 ppb
2021-03-1844650414.40 ppb
2021-03-2340980281.20 ppb
2021-03-234096992ND
2021-03-254093772ND
2021-03-254093768ND
2021-03-254093773ND
2021-03-254093770ND
2021-03-254093771ND
2021-03-254093769ND
2021-04-144465088ND
2022-01-2642636571.70 ppb
2022-01-2642636581.20 ppb
2022-01-264263659ND
2022-01-274253226ND
2022-02-044268894ND
2022-02-1042688961.70 ppb
2022-11-0343752381.90 ppb
2022-11-0343752394.00 ppb
2022-11-284395604ND
2022-12-1544113581.80 ppb