Selenium
California Water Service - Stockton
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.
203
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.165 ppb | 72 | 51 | ND - 1.10 ppb |
| 2015 | 0.233 ppb | 35 | 20 | ND - 1.30 ppb |
| 2016 | ND | 18 | 0 | ND |
| 2017 | ND | 42 | 0 | ND |
| 2018 | ND | 28 | 0 | ND |
| 2019 | ND | 8 | 0 | 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 |
|---|---|---|
| 2014-02-05 | 5810-013-1312 | ND |
| 2014-04-02 | 5810-015-1131 | ND |
| 2014-04-28 | 5810-013-1211 | ND |
| 2014-04-28 | 5810-050-1115 | ND |
| 2014-05-06 | 5701-131-0943 | 0.171 ppb |
| 2014-05-07 | 5810-055-1159 | ND |
| 2014-05-27 | 5701-131-0959 | 0.0360 ppb |
| 2014-05-30 | 5701-130-1135 | 0.0670 ppb |
| 2014-06-03 | 5701-130-1121 | 0.0460 ppb |
| 2014-06-03 | 5810-130-1125 | ND |
| 2014-06-03 | 5701-131-1125 | 0.0320 ppb |
| 2014-06-03 | 5701-132-1229 | 0.544 ppb |
| 2014-06-03 | 5810-132-1252 | ND |
| 2014-06-04 | 5810-058-1024 | ND |
| 2014-06-09 | 5701-131-1004 | 0.0450 ppb |
| 2014-06-17 | 5701-131-1613 | 0.0420 ppb |
| 2014-06-25 | 5701-028-0945 | ND |
| 2014-06-25 | 5701-045-1435 | 0.0240 ppb |
| 2014-06-25 | 5701-053-1158 | 0.590 ppb |
| 2014-06-25 | 5810-053-1203 | ND |
| 2014-06-25 | 5701-069-1003 | ND |
| 2014-06-25 | 5701-130-1110 | 0.0120 ppb |
| 2014-07-01 | 5701-065-1055 | 0.243 ppb |
| 2014-07-01 | 5701-131-0950 | ND |
| 2014-07-02 | 5701-013-1400 | 0.755 ppb |
| 2014-07-07 | 5701-131-1057 | 0.01000 ppb |
| 2014-07-08 | 5701-028-0956 | ND |
| 2014-07-08 | 5701-045-1330 | 0.0210 ppb |
| 2014-07-08 | 5701-053-0750 | 0.448 ppb |
| 2014-07-08 | 5701-069-1040 | ND |
| 2014-07-08 | 5701-130-0906 | ND |
| 2014-07-21 | 5701-131-1146 | 0.0870 ppb |
| 2014-07-30 | 5810-029-1109 | ND |
| 2014-08-05 | 5701-028-1124 | 0.390 ppb |
| 2014-08-05 | 5701-045-1345 | 0.258 ppb |
| 2014-08-05 | 5701-053-1417 | 1.10 ppb |
| 2014-08-05 | 5701-069-1023 | 0.107 ppb |
| 2014-08-05 | 5701-130-1110 | 0.307 ppb |
| 2014-08-12 | 5701-131-1350 | 0.253 ppb |
| 2014-08-19 | 5701-131-1056 | 0.0740 ppb |
| 2014-08-26 | 5701-131-1018 | 0.1000 ppb |
| 2014-09-02 | 5701-131-1150 | ND |
| 2014-09-10 | 5701-131-1225 | 0.0340 ppb |
| 2014-09-29 | 5701-131-1022 | 0.127 ppb |
| 2014-09-30 | 5701-132-1148 | 0.615 ppb |
| 2014-10-07 | 5701-131-1120 | 0.119 ppb |
| 2014-10-14 | 5701-131-1058 | 0.0180 ppb |
| 2014-10-20 | 5701-131-0954 | 0.0610 ppb |
| 2014-10-27 | 5701-131-1210 | 0.0970 ppb |
| 2014-10-28 | 5701-028-1242 | 0.143 ppb |
| 2014-10-28 | 5701-045-1307 | 0.111 ppb |
| 2014-10-28 | 5701-053-1330 | 0.400 ppb |
| 2014-10-28 | 5701-069-1250 | 0.133 ppb |
| 2014-11-03 | 5701-131-0927 | 0.245 ppb |
| 2014-11-04 | 5701-028-1344 | 0.0730 ppb |
| 2014-11-04 | 5701-045-1110 | ND |
| 2014-11-04 | 5701-053-1350 | 0.409 ppb |
| 2014-11-04 | 5701-069-0930 | ND |
| 2014-11-04 | 5701-130-1048 | 0.0770 ppb |
| 2014-11-18 | 5810-062-1326 | ND |
| 2014-12-08 | 5701-131-1033 | 0.0270 ppb |
| 2014-12-10 | 5701-130-1410 | 0.0800 ppb |
| 2014-12-10 | 5701-132-1424 | 0.765 ppb |
| 2014-12-15 | 5701-131-1048 | ND |
| 2014-12-17 | 5701-045-1422 | 0.102 ppb |
| 2014-12-17 | 5701-053-1104 | 0.628 ppb |
| 2014-12-17 | 5701-069-1820 | 0.0320 ppb |
| 2014-12-17 | 5701-130-1118 | 0.166 ppb |
| 2014-12-30 | 5701-058-1418 | 0.738 ppb |
| 2014-12-30 | 5701-063-0945 | 0.253 ppb |
| 2014-12-30 | 5701-064-1155 | 0.300 ppb |
| 2014-12-30 | 5701-067-1115 | 0.359 ppb |
| 2015-01-20 | 5701-131-1031 | 0.120 ppb |
| 2015-01-22 | 5701-054-1239 | 0.217 ppb |
| 2015-01-22 | 5810-054-1248 | ND |
| 2015-01-26 | 5701-131-1116 | 0.0820 ppb |
| 2015-02-17 | 5701-131-1112 | ND |
| 2015-03-02 | 5701-131-1017 | 0.255 ppb |
| 2015-03-04 | 5701-045-1208 | 0.194 ppb |
| 2015-03-04 | 5701-053-1430 | 0.777 ppb |
| 2015-04-06 | 5701-131-1021 | 0.624 ppb |
| 2015-04-07 | 5701-028-1347 | 0.426 ppb |
| 2015-04-07 | 5701-045-1115 | 0.373 ppb |
| 2015-04-07 | 5701-053-1406 | 1.30 ppb |
| 2015-04-08 | 5810-051-1231 | ND |
| 2015-04-27 | 5810-050-1210 | ND |
| 2015-05-12 | 5810-018-0655 | ND |
| 2015-05-20 | 5810-007-1145 | ND |
| 2015-05-20 | 5810-028-1020 | ND |
| 2015-07-14 | 5810-056-1420 | ND |
| 2015-07-15 | 5701-028-1109 | 0.246 ppb |
| 2015-07-15 | 5701-045-1140 | 0.252 ppb |
| 2015-07-15 | 5701-053-1340 | 0.989 ppb |
| 2015-07-21 | 5701-131-1050 | 0.160 ppb |
| 2015-08-16 | 1610-133-1900 | ND |
| 2015-08-25 | 5701-028-1030 | 0.274 ppb |
| 2015-08-25 | 5701-045-1448 | 0.135 ppb |
| 2015-08-25 | 5701-053-1147 | 0.820 ppb |
| 2015-08-25 | 5701-069-1022 | 0.155 ppb |
| 2015-08-25 | 5701-130-1504 | 0.1000 ppb |
| 2015-08-26 | 5701-051-1156 | 0.657 ppb |
| 2015-10-15 | 5701-060-1200 | ND |
| 2015-10-15 | 5701-060-1211 | ND |
| 2015-10-15 | 5810-060-1245 | ND |
| 2015-11-19 | 5810-059-1021 | ND |
| 2015-12-09 | 5810-018-0523 | ND |
| 2015-12-29 | 5701-062-0958 | ND |
| 2016-02-01 | 5701-131-1117 | ND |
| 2016-02-16 | 5701-131-0930 | ND |
| 2016-02-22 | 5810-052-0736 | ND |
| 2016-02-22 | 5810-067-0916 | ND |
| 2016-02-23 | 5810-061-1150 | ND |
| 2016-03-07 | 5701-131-0920 | ND |
| 2016-04-06 | 5701-061-0953 | ND |
| 2016-05-09 | 5701-131-1113 | ND |
| 2016-05-10 | 5810-045-1040 | ND |
| 2016-05-16 | 5701-131-1012 | ND |
| 2016-05-23 | 5701-131-1133 | ND |
| 2016-06-06 | 5701-131-1005 | ND |
| 2016-08-15 | 5701-131-0954 | ND |
| 2016-10-11 | 5701-131-1125 | ND |
| 2016-10-18 | 5701-028-0953 | ND |
| 2016-10-18 | 5701-045-0933 | ND |
| 2016-10-19 | 5810-064-1200 | ND |
| 2016-11-08 | 5810-063-1145 | ND |
| 2017-01-06 | 5701-028-1220 | ND |
| 2017-01-06 | 5701-045-1150 | ND |
| 2017-01-06 | 5701-053-1120 | ND |
| 2017-01-06 | 5701-061-1045 | ND |
| 2017-01-09 | 5701-131-1040 | ND |
| 2017-01-17 | 5701-131-1035 | ND |
| 2017-02-02 | 5701-051-1120 | ND |
| 2017-02-06 | 5701-069-0935 | ND |
| 2017-02-06 | 5701-131-0945 | ND |
| 2017-02-07 | 5701-045-1128 | ND |
| 2017-02-07 | 5701-053-1313 | ND |
| 2017-02-07 | 5701-059-1359 | ND |
| 2017-02-07 | 5701-060-1427 | ND |
| 2017-02-07 | 5701-130-1023 | ND |
| 2017-04-18 | 5810-015-1348 | ND |
| 2017-04-24 | 5810-007-1010 | ND |
| 2017-05-01 | 5701-069-1247 | ND |
| 2017-05-01 | 5701-131-1302 | ND |
| 2017-05-03 | 5701-007-1516 | ND |
| 2017-05-03 | 5701-051-1306 | ND |
| 2017-05-03 | 5701-055-1427 | ND |
| 2017-05-15 | 5810-055-1508 | ND |
| 2017-05-15 | 5701-131-1055 | ND |
| 2017-05-22 | 5701-131-0850 | ND |
| 2017-05-24 | 5810-018-1052 | ND |
| 2017-06-06 | 5701-130-1510 | ND |
| 2017-06-08 | 5810-058-1152 | ND |
| 2017-06-12 | 5810-132-1026 | ND |
| 2017-06-13 | 5810-053-0930 | ND |
| 2017-06-13 | 5810-130-1250 | ND |
| 2017-07-17 | 5701-131-1324 | ND |
| 2017-07-18 | 5701-028-1322 | ND |
| 2017-07-19 | 5701-045-0935 | ND |
| 2017-07-19 | 5701-053-0925 | ND |
| 2017-07-19 | 5701-061-1039 | ND |
| 2017-07-25 | 5701-015-1155 | ND |
| 2017-08-15 | 5810-029-1255 | ND |
| 2017-09-18 | 5701-131-1152 | ND |
| 2017-10-02 | 5701-131-1340 | ND |
| 2017-11-08 | 5810-062-1455 | ND |
| 2017-11-28 | 5701-131-1248 | ND |
| 2017-12-13 | 5810-050-1050 | ND |
| 2018-01-04 | 5701-028-1108 | ND |
| 2018-01-04 | 5701-045-1246 | ND |
| 2018-01-04 | 5701-053-1329 | ND |
| 2018-01-04 | 5701-061-1428 | ND |
| 2018-02-05 | 5701-069-1450 | ND |
| 2018-02-05 | 5701-131-1500 | ND |
| 2018-02-07 | 5701-045-1035 | ND |
| 2018-02-07 | 5701-053-1410 | ND |
| 2018-02-07 | 5701-059-1230 | ND |
| 2018-02-07 | 5701-060-1130 | ND |
| 2018-02-07 | 5701-130-1510 | ND |
| 2018-04-09 | 5701-131-0925 | ND |
| 2018-04-11 | 5810-051-1335 | ND |
| 2018-04-12 | 5701-133-1005 | ND |
| 2018-05-01 | 5810-054-1330 | ND |
| 2018-05-02 | 5701-045-1345 | ND |
| 2018-05-02 | 5701-053-1255 | ND |
| 2018-05-02 | 5701-059-1045 | ND |
| 2018-05-02 | 5701-060-1000 | ND |
| 2018-05-02 | 5701-130-1435 | ND |
| 2018-06-07 | 5810-059-1340 | ND |
| 2018-06-07 | 5810-060-1250 | ND |
| 2018-06-25 | 5701-131-0930 | ND |
| 2018-07-18 | 5810-056-1225 | ND |
| 2018-08-15 | 5810-133-1335 | ND |
| 2018-08-28 | 5810-028-1130 | ND |
| 2018-10-09 | 5810-028-1205 | ND |
| 2018-12-18 | 5701-131-1335 | ND |
| 2019-01-10 | 5810-061-1020 | ND |
| 2019-02-13 | 5810-052-1252 | ND |
| 2019-02-13 | 5810-067-1349 | ND |
| 2019-05-08 | 5701-051-1155 | ND |
| 2019-05-08 | 5701-059-1441 | ND |
| 2019-05-08 | 5701-060-1440 | ND |
| 2019-05-08 | 5701-130-1333 | ND |
| 2019-11-12 | 5810-063-1115 | ND |