Know Your Environment. Protect Your Health.

Selenium

City of Rule

NOTE: City of Rule purchases water from North Central Texas Municipal Water Authority which is required to test for selenium. Sample information shown below was taken by North Central Texas Municipal Water Authority.

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.20 ppb43ND - 5.60 ppb
2019ND10ND
2020ND40ND
2021ND40ND
2022ND10ND
2023ND30ND

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: City of Rule purchases water from North Central Texas Municipal Water Authority which is required to test for selenium. Sample information shown below was taken by North Central Texas Municipal Water Authority.

Date Lab ID Result
2018-02-13Q1806366003ND
2018-05-15AE281065.60 ppb
2018-05-15AE281103.40 ppb
2018-05-15AE281123.80 ppb
2019-03-07Q1909867006ND
2019-05-14Q1925812001ND
2019-05-14Q1925812002ND
2019-05-14Q1925812003ND
2020-03-17Q2011709013ND
2020-03-17Q2011709005ND
2020-03-17Q2011709004ND
2020-03-17Q2011709003ND
2021-03-01Q2105128006ND
2021-03-01Q2105128007ND
2021-05-18Q2112967012ND
2021-08-24Q2122978007ND
2022-03-02Q2207242004ND
2022-03-02Q2207242005ND
2022-09-07Q2226614011ND
2023-03-08Q2309188004ND
2023-05-16Q2318416008ND
2023-09-05Q2338005002ND