Know Your Environment. Protect Your Health.

Arsenic

West Harris County Municipal Utility District 15

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.

 

26

Samples

1

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.58 ppb43ND - 9.10 ppb
2019ND40ND
20200.980 ppb51ND - 4.90 ppb
20212.33 ppb41ND - 9.30 ppb
20222.55 ppb41ND - 10.2 ppb
20232.10 ppb52ND - 7.50 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 Lab ID Result
2018-03-05AE165692.50 ppb
2018-06-12AE294219.10 ppb
2018-08-01AE352262.70 ppb
2018-10-24AE44419ND
2019-01-28AE51551ND
2019-04-23AE63303ND
2019-07-30AE76345ND
2019-10-10AE86240ND
2020-01-13AE93071ND
2020-04-21AF07408ND
2020-09-21AF278674.90 ppb
2020-11-05AF33427ND
2020-11-05AF33430ND
2021-03-09AF459129.30 ppb
2021-04-27AF51369ND
2021-07-23AF63176ND
2021-10-12AF73059ND
2022-03-01AF86827ND
2022-05-09AF95900ND
2022-08-10AG0849510.2 ppb
2022-11-14AG18560ND
2023-02-22AG29884ND
2023-02-22AG29891ND
2023-05-15AG40417ND
2023-07-17AG486787.50 ppb
2023-10-09AG588053.00 ppb