Know Your Environment. Protect Your Health.

Selenium

Nash Forreston Water Supply Corporation

NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for selenium. Sample information shown below was taken by City of Waxahachie.

Selenium is an essential element in diets. But too much selenium can decrease thyroid hormone production and cause hair loss, skin lesions and brittle fingernails.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 30 ppb

The EWG Health Guideline of 30 ppb for selenium 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 hair loss and nail damage.

EPA Maximum Contaminant
Level (MCL): 50 ppb

The legal limit for selenium, established in 1991, was based on human epidemiological studies of populations exposed to naturally occurring selenium in drinking water. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

All test results

NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for selenium. Sample information shown below was taken by City of Waxahachie.

Date Lab ID Result
2018-01-25Q1802982013ND
2018-01-25Q1802982014ND
2019-04-29Q1916965005ND
2019-04-29Q1916965006ND
2020-08-17Q2032738007ND
2020-08-17Q2032738008ND
2021-09-16Q2125453007ND
2021-09-16Q2125453009ND
2022-01-12Q2201052002ND
2022-01-12Q2201052006ND
2023-09-05Q2338122004ND
2023-11-20Q2349758006ND