Selenium

Castle City Mobile Home Park

NOTE: Castle City Mobile Home Park purchases water from Placer County Water Agency - Foothill which is required to test for selenium. Sample information shown below was taken by Placer County Water Agency - Foothill.

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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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	ND	2	ND
2016	ND	4	ND
2017	ND	1	ND
2018	ND	1	ND
2019	ND	1	ND

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
2014-08-20	3334-007-1200	ND
2014-08-20	3334-002-1010	ND
2015-08-11	3334-002-1000	ND
2015-08-11	3334-007-1305	ND
2016-03-30	2113-014-1440	ND
2016-08-03	2113-014-1045	ND
2016-08-17	2113-002-1215	ND
2016-08-17	2113-007-0945	ND
2017-08-08	1233-007-0900	ND
2017-08-08	1233-002-1120	ND
2017-08-22	1233-014-1040	ND
2017-08-22	7473-014-1040	ND
2018-08-14	7473-007-1310	ND
2018-08-14	7473-002-1120	ND
2018-08-22	7473-014-0930	ND
2019-08-27	7473-002-1135	ND
2019-09-09	7473-007-1330	ND
2019-09-12	7473-014-1150	ND