Know Your Environment. Protect Your Health.

Arsenic

San Antonio Water Company

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND10ND
2020ND10ND
2021ND100ND
2022N/A00N/A
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
2018-07-20CA3610085_003_003-201807201156ND
2018-07-20CA3610085_004_004-201807201135ND
2018-07-20CA3610085_017_017-201807200920ND
2018-07-20CA3610085_018_018-201807200946ND
2018-07-20CA3610085_001_001-201807201100ND
2018-07-20CA3610085_013_013-201807200900ND
2018-07-20CA3610085_016_016-201807201030ND
2018-07-20CA3610085_002_002-201807200951ND
2019-01-04CA3610085_011_011-201901040953ND
2020-04-07CA3610085_021_021-202004071020ND
2021-07-20CA3610085_018_018-202107201130ND
2021-07-20CA3610085_011_011-202107200842ND
2021-07-20CA3610085_003_003-202107201013ND
2021-07-20CA3610085_002_002-202107201124ND
2021-07-20CA3610085_017_017-202107200943ND
2021-07-20CA3610085_013_013-202107200954ND
2021-07-20CA3610085_001_001-202107201036ND
2021-07-27CA3610085_021_021-202107271245ND
2021-07-27CA3610085_016_016-202107270810ND
2021-07-27CA3610085_004_004-202107270908ND