Know Your Environment. Protect Your Health.

Arsenic

Colorado City Md

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.177 ppb32ND - 0.320 ppb
20190.110 ppb21ND - 0.220 ppb
2020ND20ND
20210.360 ppb21ND - 0.720 ppb
2022ND10ND
20230.500 ppb21ND - 1.000 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 Result
2018-01-170.210 ppb
2018-01-170.320 ppb
2018-04-24ND
2019-01-29ND
2019-01-290.220 ppb
2020-01-14ND
2020-01-14ND
2021-11-100.720 ppb
2021-11-10ND
2022-02-23ND
2023-09-26ND
2023-10-021.000 ppb