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EWG's Tap Water Database — 2021 UPDATE

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Selenium

Soquel Creek Water District

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.

MORE ABOUT THIS CONTAMINANT

 

97

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
2014ND130ND
2015ND170ND
2016ND240ND
2017ND190ND
2018ND120ND
2019ND120ND

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
2014-08-132385-003-0930ND
2014-09-221644-036-1340ND
2014-09-221644-003-1040ND
2014-09-221644-004-0950ND
2014-09-221644-005-1015ND
2014-09-231644-049-0935ND
2014-10-141644-047-0917ND
2014-10-151644-007-1440ND
2014-10-151644-002-0903ND
2014-10-151644-034-0913ND
2014-10-161644-012-1330ND
2014-10-161644-022-1055ND
2014-10-161644-037-1122ND
2015-02-125806-054-0911ND
2015-04-075806-014-1505ND
2015-09-211644-004-0935ND
2015-09-221644-003-1505ND
2015-09-221644-049-1433ND
2015-09-221644-005-1407ND
2015-10-151644-047-1440ND
2015-10-151644-037-1220ND
2015-10-191644-014-1342ND
2015-10-201644-054-1140ND
2015-10-211644-002-1330ND
2015-10-211644-034-1355ND
2015-10-271644-007-0947ND
2015-10-271644-012-0919ND
2015-11-051644-036-1340ND
2015-12-242385-052-1212ND
2015-12-242385-052-1202ND
2016-01-222385-052-1216ND
2016-01-222385-052-1103ND
2016-01-222385-052-1104ND
2016-01-222385-052-1211ND
2016-01-222385-052-1212ND
2016-01-222385-052-1215ND
2016-04-082385-036-1319ND
2016-04-082385-036-1320ND
2016-04-082385-052-1311ND
2016-04-082385-052-1310ND
2016-09-191644-049-1105ND
2016-09-201644-053-1158ND
2016-09-201644-052-1150ND
2016-09-201644-036-0902ND
2016-09-201644-004-0828ND
2016-09-201644-005-0848ND
2016-10-181644-007-1120ND
2016-10-181644-037-1230ND
2016-10-191644-012-1004ND
2016-10-191644-022-1323ND
2016-10-201644-047-1428ND
2016-10-201644-014-0920ND
2016-10-261644-034-1305ND
2016-10-271644-054-1041ND
2017-01-261644-058-1237ND
2017-01-261644-005-1148ND
2017-02-021644-058-1019ND
2017-02-021644-005-0940ND
2017-05-161644-013-1425ND
2017-08-221644-004-1050ND
2017-09-131644-036-1407ND
2017-09-131644-005-1234ND
2017-09-191644-049-1109ND
2017-09-191644-053-1049ND
2017-10-031644-054-1340ND
2017-10-041644-037-1155ND
2017-10-051644-047-1102ND
2017-10-051644-034-1207ND
2017-10-101644-022-1311ND
2017-10-121644-012-0733ND
2017-10-121644-014-1335ND
2017-10-241644-013-1106ND
2017-10-241644-007-1033ND
2018-09-041644-054-1127ND
2018-09-195810-049-1433ND
2018-09-195810-005-0944ND
2018-09-195810-036-0929ND
2018-10-155810-034-1008ND
2018-10-165810-012-0903ND
2018-10-165810-013-0846ND
2018-10-165810-037-1102ND
2018-10-165810-007-1002ND
2018-10-175810-022-1205ND
2018-10-175810-014-1355ND
2018-10-175810-047-1234ND
2019-09-242385-049-0928ND
2019-09-252385-005-0832ND
2019-09-252385-036-0855ND
2019-10-152385-047-0845ND
2019-10-152385-022-1040ND
2019-10-152385-013-1315ND
2019-10-162385-037-0915ND
2019-10-212385-014-1010ND
2019-10-232385-007-1125ND
2019-10-232385-012-1005ND
2019-10-232385-034-1050ND
2019-12-305810-059-1137ND