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EWG's Tap Water Database — 2021 UPDATE

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Selenium

City of Tucson

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.

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206

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
20160.668 ppb10849ND - 6.18 ppb
2017N/A00N/A
2018N/A00N/A
20190.249 ppb9817ND - 3.66 ppb

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
2016-01-11L160042-01I1.13 ppb
2016-01-11L160042-03I1.42 ppb
2016-01-11L160042-04IND
2016-01-12L160043-01IND
2016-01-12L160043-02IND
2016-01-12L160043-03IND
2016-01-12L160043-04IND
2016-01-12L160043-05I1.38 ppb
2016-01-13L160045-02I1.06 ppb
2016-01-13L160045-04IND
2016-01-13L160045-05I1.14 ppb
2016-01-14L160046-01I1.05 ppb
2016-01-14L160046-03IND
2016-01-14L160046-04I1.05 ppb
2016-01-14L160046-05I1.12 ppb
2016-01-19L160066-01IND
2016-01-19L160066-02IND
2016-01-19L160066-03IND
2016-01-19L160066-04IND
2016-01-19L160066-05IND
2016-01-20L160068-01IND
2016-01-20L160068-02IND
2016-01-20L160068-03IND
2016-01-20L160068-04IND
2016-01-20L160068-05I1.95 ppb
2016-01-21L160069-01IND
2016-01-21L160069-02IND
2016-01-21L160069-03IND
2016-01-21L160069-04IND
2016-01-21L160069-05I1.26 ppb
2016-01-25L160091-01IND
2016-01-25L160091-02IND
2016-01-25L160091-03IND
2016-01-25L160091-04IND
2016-01-25L160091-05IND
2016-01-26L160092-01IND
2016-01-26L160092-03IND
2016-01-26L160092-04IND
2016-01-26L160092-05IND
2016-01-27L160094-01IND
2016-01-27L160094-02IND
2016-01-27L160094-04I1.05 ppb
2016-01-27L160094-05I1.19 ppb
2016-01-28L160104-02I1.30 ppb
2016-01-28L160104-03I1.44 ppb
2016-01-28L160104-04I2.35 ppb
2016-01-28L160118-011.23 ppb
2016-02-01L160119-011.44 ppb
2016-02-01L160119-03I1.56 ppb
2016-02-01L160119-04I2.87 ppb
2016-02-02L160122-01I1.58 ppb
2016-02-02L160122-02IND
2016-02-02L160122-03IND
2016-02-02L160122-04IND
2016-02-02L160122-05IND
2016-02-03L160123-01IND
2016-02-03L160123-04IND
2016-02-04L160125-01IND
2016-02-04L160125-02I1.84 ppb
2016-02-04L160125-03I1.15 ppb
2016-02-04L160125-04I1.61 ppb
2016-02-08L160143-02IND
2016-02-08L160143-03I1.12 ppb
2016-02-08L160143-05I1.38 ppb
2016-02-09L160144-02I1.16 ppb
2016-02-09L160144-03I1.34 ppb
2016-02-09L160144-04I1.21 ppb
2016-02-09L160144-05I1.17 ppb
2016-02-10L160145-03IND
2016-02-10L160145-04I1.15 ppb
2016-02-10L160145-05I1.19 ppb
2016-02-11L160148-011.15 ppb
2016-02-11L160148-02T1.35 ppb
2016-02-11L160148-04T1.32 ppb
2016-02-11L160148-05I1.22 ppb
2016-02-11L160171-01I1.67 ppb
2016-02-16L160172-03IND
2016-02-16L160172-04I1.87 ppb
2016-02-17L160173-01IND
2016-02-17L160173-021.29 ppb
2016-02-18L160178-04ND
2016-02-23L160210-011.000 ppb
2016-02-23L160210-02ND
2016-02-23L160210-03ND
2016-02-24L160211-01JND
2016-02-24L160211-02JND
2016-02-24L160211-03JND
2016-02-25L160212-03ND
2016-02-29L160245-01ND
2016-02-29L160245-02ND
2016-03-01L160246-03JND
2016-03-02L160247-01ND
2016-03-07L160268-02J1.53 ppb
2016-03-10L160280-02J1.25 ppb
2016-03-10L160280-03T1.35 ppb
2016-04-20L160468-01ND
2016-04-27L160497-05ND
2016-04-28L160498-011.14 ppb
2016-04-28L160498-02ND
2016-04-28L160498-041.89 ppb
2016-05-02L160516-016.18 ppb
2016-05-03L160517-011.07 ppb
2016-05-05L160525-02ND
2016-05-31L160656-01I1.15 ppb
2016-05-31L160656-02IND
2016-06-14L160697-01IND
2016-06-16L160723-01I1.22 ppb
2016-10-04L161215-011.64 ppb
2019-03-19L190423-01 IOC1.38 ppb
2019-04-01L190499-02ND
2019-04-01L190499-03ND
2019-04-01L190499-05ND
2019-04-01L190499-06ND
2019-04-04L190541-01ND
2019-04-11L190512-01ND
2019-04-11L190512-02ND
2019-04-11L190512-03ND
2019-04-11L190512-041.02 ppb
2019-04-15L190597-01ND
2019-04-15L190597-02ND
2019-04-15L190597-03ND
2019-04-15L190597-043.66 ppb
2019-04-17L190610-01ND
2019-04-17L190610-03ND
2019-04-18L190624-01ND
2019-04-18L190624-02ND
2019-04-18L190624-03ND
2019-04-23L190640-01ND
2019-04-23L190640-021.37 ppb
2019-04-23L190640-031.35 ppb
2019-04-23L190640-041.39 ppb
2019-04-24L190645-02ND
2019-04-24L190645-03ND
2019-04-25L190648-01ND
2019-04-25L190648-02ND
2019-04-25L190648-03ND
2019-04-30L190670-01ND
2019-04-30L190670-02ND
2019-05-01L190678-02ND
2019-05-01L190678-03ND
2019-05-01L190678-04ND
2019-05-02L190690-01ND
2019-05-02L190690-03ND
2019-05-06L190704-03ND
2019-05-07L190712-011.41 ppb
2019-05-07L190712-02ND
2019-05-07L190712-03ND
2019-05-08L190725-01ND
2019-05-08L190725-021.28 ppb
2019-05-09L190728-01-20131ND
2019-05-13L190741-01-20131ND
2019-05-13L190741-02-201311.77 ppb
2019-05-14L190748-02-20131ND
2019-05-15L190761-01-201311.21 ppb
2019-05-15L190761-02-20131ND
2019-05-15L190761-03-20131ND
2019-05-20L190783-02-201311.24 ppb
2019-05-20L190783-03-20131ND
2019-05-28L190813-01-062601.07 ppb
2019-05-28L190813-02-06260ND
2019-05-28L190813-03-06260ND
2019-05-28L190813-04-06260ND
2019-05-30L190835-01-06260ND
2019-05-30L190835-02-06260ND
2019-05-30L190835-03-06260ND
2019-05-30L190835-04-062601.50 ppb
2019-05-30L190835-05-062601.31 ppb
2019-05-30L190835-06-06260ND
2019-06-03L190837-01-06260ND
2019-06-03L190837-02-06260ND
2019-06-03L190837-03-06260ND
2019-06-03L190837-04-06260ND
2019-06-03L190837-05-06260ND
2019-06-04L190851-01-06281ND
2019-06-04L190851-03-06281ND
2019-06-04L190851-04-06281ND
2019-06-04L190851-05-06281ND
2019-06-06L190879-01-06281ND
2019-06-06L190879-02-06281ND
2019-06-06L190879-03-06281ND
2019-06-06L190879-04-06281ND
2019-06-06L190879-05-06281ND
2019-06-11L190893-01-06281ND
2019-06-11L190893-02-06281ND
2019-06-11L190893-03-06281ND
2019-06-11L190893-04-06281ND
2019-06-13L190907-01-07081ND
2019-06-13L190907-02-07081ND
2019-06-13L190907-03-07081ND
2019-06-13L190907-04-07081ND
2019-06-25L190968-01-07081ND
2019-06-27L190983-01-08131ND
2019-08-20L191266-01-10011ND
2019-08-20L191266-02-10011ND
2019-08-22L191282-01-100111.09 ppb
2019-08-22L191282-02-10011ND
2019-09-09L191400-01-10011ND
2019-09-09L191400-02-10011ND
2019-09-10L191408-01-10011ND
2019-09-11L191425-01-10011ND
2019-09-11L191425-02-10011ND
2019-09-11L191425-03-10011ND
2019-09-12L191433-01-10011ND
2019-09-16L191452-01-100211.32 ppb
2019-11-19L191822-01-010711.04 ppb
2019-11-20L191829-01-01071ND