Know Your Environment. Protect Your Health.

Selenium

Terra Bella Irrigation District - Tbt

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND90ND
2020ND40ND
2021ND30ND
2022ND50ND
2023ND40ND

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

Date Lab ID Result
2018-09-17CA5410038_001_001-201809171140ND
2018-09-24CA5410038_032_032-201809241300ND
2018-09-24CA5410038_027_027-201809241445ND
2019-08-29CA5410038_004_004-201908291114ND
2019-08-29CA5410038_020_020-201908291222ND
2019-08-29CA5410038_013_013-201908291108ND
2019-08-29CA5410038_009_009-201908291228ND
2019-08-29CA5410038_001_001-201908291400ND
2019-08-29CA5410038_016_016-201908291216ND
2019-08-29CA5410038_014_014-201908291125ND
2019-08-29CA5410038_025_025-201908291300ND
2019-08-29CA5410038_002_002-201908291226ND
2020-08-27CA5410038_001_001-202008271300ND
2020-08-31CA5410038_024_024-202008311304ND
2020-11-30CA5410038_024_024-202011301225ND
2020-12-29CA5410038_028_028-202012291250ND
2021-08-23CA5410038_001_001-202108231210ND
2021-09-13CA5410038_032_032-202109131219ND
2021-09-13CA5410038_027_027-202109131310ND
2022-08-15CA5410038_001_001-202208151150ND
2022-09-19CA5410038_009_009-202209191158ND
2022-09-19CA5410038_025_025-202209191232ND
2022-09-19CA5410038_016_016-202209191148ND
2022-09-19CA5410038_020_020-202209191152ND
2023-03-28CA5410038_002_002-202303281235ND
2023-07-24CA5410038_001_001-202307241220ND
2023-09-12CA5410038_024_024-202309121220ND
2023-12-04CA5410038_028_028-202312041315ND