Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Selenium

Farmerville Water System

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND140ND
2016N/A00N/A
2017N/A00N/A
20180.0967 ppb122ND - 0.580 ppb
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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

Date Lab ID Result
2015-07-2135198892004ND
2015-07-2135198892002ND
2015-07-2135198892001ND
2015-07-2135198892003ND
2015-07-2135198892004ND
2015-07-2135198892005ND
2015-07-2135198892003ND
2015-07-2135198892002ND
2015-07-2135198892001ND
2015-07-2135198892005ND
2015-08-2435204447004ND
2015-08-2435204447003ND
2015-08-2435204447003ND
2015-08-2435204447004ND
2018-04-2535388787005ND
2018-04-2535388787004ND
2018-04-2535388787003ND
2018-04-25353887870020.580 ppb
2018-04-2535388787003ND
2018-04-2535388787004ND
2018-04-2535388787005ND
2018-04-25353887870020.580 ppb
2018-05-1535392914001ND
2018-05-1535392914002ND
2018-05-1535392914001ND
2018-05-1535392914002ND