Selenium
Golden State Water Company - Edna
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.
304
Samples
11
Samples exceeding legal limit (MCL)
64
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 21.2 ppb | 51 | 50 | ND - 79.0 ppb |
| 2015 | 15.4 ppb | 49 | 43 | ND - 51.0 ppb |
| 2016 | 17.1 ppb | 52 | 51 | ND - 56.0 ppb |
| 2017 | 30.9 ppb | 46 | 45 | ND - 82.0 ppb |
| 2018 | 24.2 ppb | 51 | 49 | ND - 120.0 ppb |
| 2019 | 26.4 ppb | 55 | 55 | 9.60 ppb - 70.0 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 |
|---|---|---|
| 2014-01-02 | 2706-012-0738 | 19.0 ppb |
| 2014-01-08 | 2706-012-0734 | 17.0 ppb |
| 2014-01-15 | 2706-012-0730 | 40.0 ppb |
| 2014-01-22 | 2706-012-0755 | 38.0 ppb |
| 2014-01-29 | 2706-012-0758 | 43.0 ppb |
| 2014-02-05 | 2706-012-0826 | 79.0 ppb |
| 2014-02-12 | 2706-012-0819 | 28.0 ppb |
| 2014-02-19 | 2706-012-0752 | 27.0 ppb |
| 2014-02-26 | 2706-012-0826 | 18.0 ppb |
| 2014-03-05 | 2706-012-0800 | 20.0 ppb |
| 2014-03-12 | 2706-012-0842 | 23.0 ppb |
| 2014-03-19 | 2706-012-0803 | 20.0 ppb |
| 2014-04-02 | 2706-012-0751 | ND |
| 2014-04-16 | 2706-012-0844 | 21.0 ppb |
| 2014-04-23 | 2706-012-0805 | 22.0 ppb |
| 2014-04-30 | 2706-012-0817 | 19.0 ppb |
| 2014-05-07 | 2706-012-0806 | 17.0 ppb |
| 2014-05-07 | 2706-016-0823 | 33.0 ppb |
| 2014-05-21 | 2706-012-0820 | 14.0 ppb |
| 2014-05-28 | 2706-012-0905 | 14.0 ppb |
| 2014-06-04 | 2706-012-0830 | 17.0 ppb |
| 2014-06-11 | 2706-012-0826 | 17.0 ppb |
| 2014-06-18 | 2706-012-0810 | 19.0 ppb |
| 2014-06-25 | 2706-012-0845 | 16.0 ppb |
| 2014-07-02 | 2706-012-0825 | 13.0 ppb |
| 2014-07-09 | 2706-012-0750 | 17.0 ppb |
| 2014-07-16 | 2706-012-0700 | 16.0 ppb |
| 2014-07-23 | 2706-012-0750 | 15.0 ppb |
| 2014-07-30 | 2706-012-0750 | 15.0 ppb |
| 2014-08-13 | 2706-012-0825 | 11.0 ppb |
| 2014-08-20 | 2706-012-0800 | 14.0 ppb |
| 2014-08-26 | 2706-012-0835 | 12.0 ppb |
| 2014-09-03 | 2706-012-0800 | 17.0 ppb |
| 2014-09-10 | 2706-012-0825 | 15.0 ppb |
| 2014-09-17 | 2706-012-0820 | 19.0 ppb |
| 2014-09-24 | 2706-012-0810 | 18.0 ppb |
| 2014-10-01 | 2706-012-0842 | 16.0 ppb |
| 2014-10-08 | 2706-012-0814 | 18.0 ppb |
| 2014-10-15 | 2706-012-0810 | 17.0 ppb |
| 2014-10-22 | 2706-012-0820 | 16.0 ppb |
| 2014-10-29 | 2706-012-0810 | 18.0 ppb |
| 2014-11-05 | 2706-012-0818 | 19.0 ppb |
| 2014-11-05 | 2706-016-0750 | 31.0 ppb |
| 2014-11-12 | 2706-012-0850 | 18.0 ppb |
| 2014-11-19 | 2706-012-0747 | 17.0 ppb |
| 2014-11-24 | 2706-012-0815 | 17.0 ppb |
| 2014-12-03 | 2706-012-0835 | 28.0 ppb |
| 2014-12-10 | 2706-012-0825 | 20.0 ppb |
| 2014-12-17 | 2706-012-0820 | 35.0 ppb |
| 2014-12-23 | 2706-012-0832 | 28.0 ppb |
| 2014-12-30 | 2706-012-0850 | 19.0 ppb |
| 2015-01-07 | 2706-012-0825 | 12.0 ppb |
| 2015-01-14 | 2706-012-0820 | 26.0 ppb |
| 2015-01-21 | 2706-012-0810 | 19.0 ppb |
| 2015-01-28 | 2706-012-0825 | 19.0 ppb |
| 2015-02-04 | 2706-012-0834 | 25.0 ppb |
| 2015-02-18 | 2706-012-0910 | 28.0 ppb |
| 2015-02-25 | 2706-012-0750 | 19.0 ppb |
| 2015-03-11 | 2706-012-0900 | 22.0 ppb |
| 2015-03-18 | 2706-012-0840 | 16.0 ppb |
| 2015-03-25 | 2706-012-0820 | 19.0 ppb |
| 2015-04-01 | 2706-012-0825 | 18.0 ppb |
| 2015-04-08 | 2706-012-0830 | 18.0 ppb |
| 2015-04-15 | 2706-012-0828 | 19.0 ppb |
| 2015-04-22 | 2706-012-0855 | 28.0 ppb |
| 2015-04-29 | 2706-012-0838 | 18.0 ppb |
| 2015-05-06 | 2706-012-0830 | ND |
| 2015-05-12 | 2706-012-1035 | 8.60 ppb |
| 2015-05-20 | 2706-012-0845 | 8.10 ppb |
| 2015-05-27 | 2706-012-0942 | 7.70 ppb |
| 2015-06-03 | 2706-012-0840 | 8.20 ppb |
| 2015-06-10 | 2706-012-0855 | 31.0 ppb |
| 2015-06-17 | 2706-012-0920 | 27.0 ppb |
| 2015-06-24 | 2706-012-0835 | 51.0 ppb |
| 2015-07-01 | 2706-012-0840 | ND |
| 2015-07-08 | 2706-012-0930 | 31.0 ppb |
| 2015-07-15 | 2706-012-0830 | 13.0 ppb |
| 2015-07-22 | 2706-012-1000 | 25.0 ppb |
| 2015-07-29 | 2706-012-0855 | 16.0 ppb |
| 2015-08-05 | 2706-012-0818 | 12.0 ppb |
| 2015-08-12 | 2706-012-0855 | ND |
| 2015-08-26 | 2706-012-0910 | 14.0 ppb |
| 2015-09-02 | 2706-012-0840 | 15.0 ppb |
| 2015-09-09 | 2706-012-0915 | 18.0 ppb |
| 2015-09-16 | 2706-012-0815 | 14.0 ppb |
| 2015-09-23 | 2706-012-1005 | 12.0 ppb |
| 2015-09-30 | 2706-012-0905 | 10.00 ppb |
| 2015-10-07 | 2706-012-0835 | 13.0 ppb |
| 2015-10-14 | 2706-012-0830 | ND |
| 2015-10-21 | 2706-012-0815 | 14.0 ppb |
| 2015-10-28 | 2706-012-0930 | 13.0 ppb |
| 2015-11-04 | 2706-012-0740 | ND |
| 2015-11-10 | 2706-012-0955 | ND |
| 2015-11-18 | 2706-012-1330 | 5.40 ppb |
| 2015-11-23 | 2706-012-0940 | 25.0 ppb |
| 2015-12-02 | 2706-012-0825 | 23.0 ppb |
| 2015-12-09 | 2706-012-0835 | 5.80 ppb |
| 2015-12-16 | 2706-012-0855 | 8.20 ppb |
| 2015-12-21 | 2706-012-1025 | 13.0 ppb |
| 2015-12-29 | 2706-012-0815 | 8.60 ppb |
| 2016-01-06 | 2706-012-0820 | 12.0 ppb |
| 2016-01-13 | 2706-012-0835 | 35.0 ppb |
| 2016-01-20 | 2706-012-0923 | 56.0 ppb |
| 2016-01-27 | 2706-012-0920 | 43.0 ppb |
| 2016-02-03 | 2706-012-0910 | 29.0 ppb |
| 2016-02-10 | 2706-012-0840 | 6.60 ppb |
| 2016-02-17 | 2706-012-0912 | 7.40 ppb |
| 2016-02-23 | 2706-012-0905 | 9.10 ppb |
| 2016-03-02 | 2706-012-0815 | 7.40 ppb |
| 2016-03-09 | 2706-012-0845 | 7.70 ppb |
| 2016-03-16 | 2706-012-1000 | 9.90 ppb |
| 2016-03-23 | 2706-012-0840 | 9.20 ppb |
| 2016-03-30 | 2706-012-0925 | 12.0 ppb |
| 2016-04-06 | 2706-012-0855 | 7.60 ppb |
| 2016-04-13 | 2706-012-0840 | 8.40 ppb |
| 2016-04-20 | 2706-012-0815 | 6.40 ppb |
| 2016-04-27 | 2706-012-0825 | 6.40 ppb |
| 2016-05-04 | 2706-012-0900 | 21.0 ppb |
| 2016-05-11 | 2706-012-0925 | 23.0 ppb |
| 2016-05-18 | 2706-012-0920 | 18.0 ppb |
| 2016-05-25 | 2706-012-0845 | 16.0 ppb |
| 2016-06-01 | 2706-012-0820 | 15.0 ppb |
| 2016-06-08 | 2706-012-0935 | 18.0 ppb |
| 2016-06-15 | 2706-012-0835 | 14.0 ppb |
| 2016-06-22 | 2706-012-0835 | 13.0 ppb |
| 2016-06-29 | 2706-012-0855 | 12.0 ppb |
| 2016-07-06 | 2706-012-0905 | 9.90 ppb |
| 2016-07-13 | 2706-012-0905 | 9.90 ppb |
| 2016-07-20 | 2706-012-0905 | 11.0 ppb |
| 2016-07-27 | 2706-012-0908 | 11.0 ppb |
| 2016-08-03 | 2706-012-0900 | 14.0 ppb |
| 2016-08-10 | 2706-012-0815 | 19.0 ppb |
| 2016-08-17 | 2706-012-0910 | ND |
| 2016-08-24 | 2706-012-0835 | 14.0 ppb |
| 2016-08-31 | 2706-012-0858 | 19.0 ppb |
| 2016-09-07 | 2706-012-0955 | 15.0 ppb |
| 2016-09-14 | 2706-012-0740 | 20.0 ppb |
| 2016-09-21 | 2706-012-0832 | 21.0 ppb |
| 2016-09-28 | 2706-012-0855 | 19.0 ppb |
| 2016-10-05 | 2706-012-0840 | 30.0 ppb |
| 2016-10-12 | 2706-012-0825 | 19.0 ppb |
| 2016-10-19 | 2706-012-0820 | 21.0 ppb |
| 2016-10-26 | 2706-012-0810 | 22.0 ppb |
| 2016-11-02 | 2706-012-0800 | 35.0 ppb |
| 2016-11-09 | 2706-012-0906 | 23.0 ppb |
| 2016-11-16 | 2706-012-0839 | 52.0 ppb |
| 2016-11-22 | 2706-012-0735 | 5.40 ppb |
| 2016-11-30 | 2706-012-0840 | 9.50 ppb |
| 2016-12-07 | 2706-012-0950 | 13.0 ppb |
| 2016-12-14 | 2706-012-0720 | 18.0 ppb |
| 2016-12-20 | 2706-012-0940 | 17.0 ppb |
| 2016-12-28 | 2706-012-0842 | 20.0 ppb |
| 2017-01-03 | 9590-012-0800 | 29.0 ppb |
| 2017-01-10 | 9590-012-0925 | 20.0 ppb |
| 2017-01-17 | 9590-012-0955 | 27.0 ppb |
| 2017-01-24 | 9590-012-0940 | 21.0 ppb |
| 2017-01-31 | 9590-012-0958 | 27.0 ppb |
| 2017-02-07 | 9590-012-0925 | 30.0 ppb |
| 2017-02-14 | 9590-012-0918 | 23.0 ppb |
| 2017-03-07 | 9590-012-0815 | 48.0 ppb |
| 2017-03-14 | 9590-012-0750 | 49.0 ppb |
| 2017-03-21 | 9590-012-0912 | 38.0 ppb |
| 2017-03-28 | 9590-012-0935 | 26.0 ppb |
| 2017-04-04 | 9590-012-0732 | 49.0 ppb |
| 2017-04-11 | 9590-012-0930 | 82.0 ppb |
| 2017-04-18 | 9590-012-0952 | 23.0 ppb |
| 2017-04-25 | 9590-012-0900 | 31.0 ppb |
| 2017-05-02 | 9590-012-0858 | 32.0 ppb |
| 2017-05-09 | 9590-012-0845 | 57.0 ppb |
| 2017-05-16 | 9590-012-0955 | 44.0 ppb |
| 2017-05-23 | 9590-012-0915 | ND |
| 2017-07-05 | 9590-012-0930 | 36.0 ppb |
| 2017-07-07 | 9590-012-1035 | 45.0 ppb |
| 2017-07-11 | 9590-012-0855 | 36.0 ppb |
| 2017-07-18 | 9590-012-0935 | 28.0 ppb |
| 2017-07-25 | 9590-012-0910 | 21.0 ppb |
| 2017-08-01 | 9590-012-0920 | 29.0 ppb |
| 2017-08-08 | 9590-012-0850 | 23.0 ppb |
| 2017-08-15 | 9590-012-0830 | 22.0 ppb |
| 2017-08-22 | 9590-012-0845 | 21.0 ppb |
| 2017-08-29 | 9590-012-1047 | 16.0 ppb |
| 2017-09-05 | 9590-012-0845 | 22.0 ppb |
| 2017-09-12 | 9590-012-0920 | 46.0 ppb |
| 2017-09-19 | 9590-012-0905 | 22.0 ppb |
| 2017-09-26 | 9590-012-0910 | 33.0 ppb |
| 2017-10-03 | 9590-012-0930 | 21.0 ppb |
| 2017-10-10 | 9590-012-0730 | 35.0 ppb |
| 2017-10-17 | 9590-012-0830 | 24.0 ppb |
| 2017-10-24 | 9590-012-0845 | 20.0 ppb |
| 2017-10-31 | 9590-012-0815 | 39.0 ppb |
| 2017-11-07 | 9590-012-0800 | 34.0 ppb |
| 2017-11-14 | 9590-012-1045 | 14.0 ppb |
| 2017-11-21 | 9590-012-1040 | 29.0 ppb |
| 2017-11-28 | 9590-012-0845 | 24.0 ppb |
| 2017-12-05 | 9590-012-0905 | 24.0 ppb |
| 2017-12-12 | 9590-012-0928 | 45.0 ppb |
| 2017-12-19 | 9590-012-0905 | 25.0 ppb |
| 2017-12-27 | 9590-012-0955 | 31.0 ppb |
| 2018-01-02 | 9590-012-1035 | 34.0 ppb |
| 2018-01-13 | 9590-012-1510 | 18.0 ppb |
| 2018-01-16 | 9590-012-0958 | 25.0 ppb |
| 2018-01-23 | 9590-012-0855 | 47.0 ppb |
| 2018-01-30 | 9590-012-0830 | 16.0 ppb |
| 2018-02-06 | 9590-012-0835 | 17.0 ppb |
| 2018-02-08 | 9590-012-1025 | 8.40 ppb |
| 2018-02-13 | 9590-012-0940 | 18.0 ppb |
| 2018-02-13 | 9590-016-1100 | 120.0 ppb |
| 2018-02-15 | 9590-012-0830 | 22.0 ppb |
| 2018-02-15 | 9590-012-1225 | 34.0 ppb |
| 2018-02-20 | 9590-012-0930 | 15.0 ppb |
| 2018-02-27 | 9590-012-0820 | 16.0 ppb |
| 2018-03-06 | 9590-012-0820 | 21.0 ppb |
| 2018-03-13 | 9590-012-0840 | 13.0 ppb |
| 2018-03-20 | 9590-012-0900 | 11.0 ppb |
| 2018-03-26 | 9590-012-0910 | 16.0 ppb |
| 2018-04-03 | 9590-012-0935 | 15.0 ppb |
| 2018-04-09 | 9590-012-1335 | 20.0 ppb |
| 2018-04-17 | 9590-012-0835 | 38.0 ppb |
| 2018-04-24 | 9590-012-0820 | 20.0 ppb |
| 2018-05-01 | 9590-012-0950 | 8.30 ppb |
| 2018-05-08 | 2438-012-0920 | 11.0 ppb |
| 2018-05-15 | 2438-012-0755 | 30.0 ppb |
| 2018-05-22 | 2438-012-0825 | 26.0 ppb |
| 2018-06-25 | 9590-012-1135 | ND |
| 2018-07-10 | 9590-012-1005 | ND |
| 2018-07-17 | 9590-012-0700 | 8.50 ppb |
| 2018-07-23 | 9590-012-1020 | 16.0 ppb |
| 2018-07-30 | 9590-012-1210 | 12.0 ppb |
| 2018-08-06 | 9590-012-1135 | 16.0 ppb |
| 2018-08-13 | 9590-012-0935 | 10.00 ppb |
| 2018-08-20 | 9590-012-1055 | 5.20 ppb |
| 2018-08-27 | 9590-012-1145 | 11.0 ppb |
| 2018-09-04 | 9590-012-1110 | 32.0 ppb |
| 2018-09-10 | 9590-012-0900 | 26.0 ppb |
| 2018-09-17 | 9590-012-1010 | 34.0 ppb |
| 2018-09-24 | 9590-012-1005 | 28.0 ppb |
| 2018-10-01 | 9590-012-0955 | 30.0 ppb |
| 2018-10-08 | 9590-012-0845 | 61.0 ppb |
| 2018-10-15 | 9590-012-0830 | 32.0 ppb |
| 2018-10-22 | 9590-012-0830 | 33.0 ppb |
| 2018-10-29 | 9590-012-0810 | 21.0 ppb |
| 2018-11-05 | 9590-012-0907 | 36.0 ppb |
| 2018-11-13 | 9590-012-1005 | 26.0 ppb |
| 2018-11-19 | 9590-012-0840 | 26.0 ppb |
| 2018-11-26 | 9590-012-0845 | 34.0 ppb |
| 2018-12-03 | 9590-012-0945 | 26.0 ppb |
| 2018-12-10 | 9590-012-0942 | 35.0 ppb |
| 2018-12-17 | 9590-012-0812 | 24.0 ppb |
| 2018-12-26 | 9590-012-1048 | 30.0 ppb |
| 2019-01-02 | 9590-012-1000 | 28.0 ppb |
| 2019-01-07 | 9590-012-1120 | 45.0 ppb |
| 2019-01-14 | 9590-012-0955 | 16.0 ppb |
| 2019-01-22 | 9590-012-0950 | 13.0 ppb |
| 2019-01-22 | 9590-016-0955 | 70.0 ppb |
| 2019-01-29 | 9590-012-0935 | 15.0 ppb |
| 2019-02-04 | 9590-012-0922 | 21.0 ppb |
| 2019-02-11 | 9590-012-1055 | 9.60 ppb |
| 2019-02-19 | 9590-012-1022 | 16.0 ppb |
| 2019-02-25 | 9590-012-1045 | 12.0 ppb |
| 2019-03-04 | 9590-012-0855 | 15.0 ppb |
| 2019-03-12 | 9590-012-0900 | 20.0 ppb |
| 2019-03-18 | 9590-012-0855 | 14.0 ppb |
| 2019-03-25 | 9590-012-0835 | 18.0 ppb |
| 2019-04-01 | 9590-012-1010 | 42.0 ppb |
| 2019-04-08 | 9590-012-1158 | 11.0 ppb |
| 2019-04-15 | 9590-012-0812 | 13.0 ppb |
| 2019-04-22 | 9590-012-0825 | 13.0 ppb |
| 2019-04-29 | 9590-012-0840 | 13.0 ppb |
| 2019-05-06 | 9590-012-0845 | 14.0 ppb |
| 2019-05-14 | 9590-012-0940 | 46.0 ppb |
| 2019-05-20 | 9590-012-0815 | 47.0 ppb |
| 2019-05-21 | 9590-012-0755 | 35.0 ppb |
| 2019-05-28 | 9590-012-1035 | 48.0 ppb |
| 2019-06-03 | 9590-012-1010 | 35.0 ppb |
| 2019-06-10 | 9590-012-0947 | 23.0 ppb |
| 2019-06-17 | 9590-012-0930 | 27.0 ppb |
| 2019-06-25 | 9590-012-1005 | 29.0 ppb |
| 2019-07-02 | 9590-012-0915 | 26.0 ppb |
| 2019-07-08 | 9590-012-1020 | 22.0 ppb |
| 2019-07-15 | 9590-012-0940 | 22.0 ppb |
| 2019-07-22 | 9590-012-0840 | 14.0 ppb |
| 2019-07-29 | 9590-012-0940 | 14.0 ppb |
| 2019-08-05 | 9590-012-1028 | 14.0 ppb |
| 2019-08-12 | 9590-012-1005 | 23.0 ppb |
| 2019-08-19 | 9590-012-0955 | 38.0 ppb |
| 2019-08-26 | 9590-012-0920 | 19.0 ppb |
| 2019-09-03 | 9590-012-0855 | 18.0 ppb |
| 2019-09-09 | 9590-012-1012 | 35.0 ppb |
| 2019-09-16 | 9590-012-0930 | 35.0 ppb |
| 2019-09-23 | 9590-012-1030 | 35.0 ppb |
| 2019-09-30 | 9590-012-0905 | 23.0 ppb |
| 2019-10-07 | 9590-012-0820 | 12.0 ppb |
| 2019-10-14 | 9590-012-0930 | 16.0 ppb |
| 2019-10-21 | 9590-012-0900 | 22.0 ppb |
| 2019-10-28 | 9590-012-1112 | 30.0 ppb |
| 2019-11-04 | 9590-012-0935 | 36.0 ppb |
| 2019-11-12 | 9590-012-1025 | 63.0 ppb |
| 2019-11-18 | 9590-012-1030 | 45.0 ppb |
| 2019-11-25 | 9590-012-0910 | 46.0 ppb |
| 2019-12-02 | 9590-012-1034 | 59.0 ppb |
| 2019-12-09 | 9590-012-1025 | 17.0 ppb |
| 2019-12-16 | 9590-012-1045 | 16.0 ppb |
| 2019-12-26 | 9590-012-1020 | 23.0 ppb |
| 2019-12-30 | 9590-012-0938 | 19.0 ppb |