Chromium (total)
California Water Service (CWS) - Los Altos Suburban
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
118
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 |
|---|---|---|---|---|
| 2013 | 1.07 ppb | 46 | 44 | ND - 4.00 ppb |
| 2014 | 3.12 ppb | 15 | 11 | ND - 6.63 ppb |
| 2015 | 0.538 ppb | 15 | 1 | ND - 8.07 ppb |
| 2016 | 1.89 ppb | 11 | 2 | ND - 10.4 ppb |
| 2017 | ND | 7 | 0 | ND |
| 2018 | ND | 15 | 0 | ND |
| 2019 | ND | 9 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2013-06-04 | 201306060239AM | 1.60 ppb |
| 2013-06-04 | 201306060116AM | 1.50 ppb |
| 2013-06-04 | 201306060103AM | 0.510 ppb |
| 2013-06-05 | 201306060245AM | 1.30 ppb |
| 2013-06-05 | 201306060218AM | 0.380 ppb |
| 2013-06-05 | 201306060173AM | 1.60 ppb |
| 2013-06-10 | 201306110154AM | 0.330 ppb |
| 2013-06-10 | 201306110408AM | 1.60 ppb |
| 2013-06-10 | 201306110394AM | 0.740 ppb |
| 2013-06-10 | 201306110143AM | 0.730 ppb |
| 2013-06-10 | 201306110110AM | 1.60 ppb |
| 2013-06-10 | 201306110200AM | 1.000 ppb |
| 2013-06-10 | 201306110089AM | 0.670 ppb |
| 2013-06-10 | 201306110203AM | 0.960 ppb |
| 2013-06-12 | 201306130096AM | 2.40 ppb |
| 2013-06-13 | 201306140050AM | 0.840 ppb |
| 2013-06-13 | 201306140055AM | 0.870 ppb |
| 2013-06-13 | 201306140058AM | 0.500 ppb |
| 2013-06-18 | 201306190307AM | 4.00 ppb |
| 2013-06-18 | 201306190264AM | 2.90 ppb |
| 2013-06-18 | 201306190286AM | 2.20 ppb |
| 2013-09-11 | 201309120299AM | ND |
| 2013-09-11 | 201309120305AM | 0.200 ppb |
| 2013-12-03 | 201312040563AM | 1.80 ppb |
| 2013-12-03 | 201312040597AM | 1.50 ppb |
| 2013-12-03 | 201312040604AM | 1.30 ppb |
| 2013-12-03 | 201312040580AM | 0.620 ppb |
| 2013-12-03 | 201312040589AM | 0.210 ppb |
| 2013-12-04 | 201312050166AM | 1.20 ppb |
| 2013-12-05 | 201312060284AM | ND |
| 2013-12-09 | 201312100211AM | 1.50 ppb |
| 2013-12-09 | 201312100194AM | 0.670 ppb |
| 2013-12-09 | 201312100222AM | 0.460 ppb |
| 2013-12-09 | 201312100232AM | 1.50 ppb |
| 2013-12-09 | 201312100255AM | 0.460 ppb |
| 2013-12-10 | 201312110716AM | 2.20 ppb |
| 2013-12-10 | 201312110681AM | 0.220 ppb |
| 2013-12-11 | 201312120623AM | 0.510 ppb |
| 2013-12-16 | 201312170384AM | 1.60 ppb |
| 2013-12-16 | 201312170374AM | 0.360 ppb |
| 2013-12-16 | 201312170438AM | 0.560 ppb |
| 2013-12-16 | 201312170409AM | 0.550 ppb |
| 2013-12-16 | 201312170405AM | 0.260 ppb |
| 2013-12-17 | 201312180646AM | 1.40 ppb |
| 2013-12-17 | 201312180736AM | 1.000 ppb |
| 2013-12-18 | 201312200053AM | 0.690 ppb |
| 2014-02-18 | 5701-032-1742 | 4.68 ppb |
| 2014-03-05 | 201403060204AM | ND |
| 2014-03-05 | 201403060232AM | 1.10 ppb |
| 2014-05-13 | 5701-032-1233 | 4.24 ppb |
| 2014-06-04 | 201406050006AM | 0.890 ppb |
| 2014-09-09 | 5810-011-1250 | ND |
| 2014-09-10 | 5810-010-1019 | ND |
| 2014-09-10 | 5810-016-1125 | ND |
| 2014-10-02 | 5701-008-1400 | 2.45 ppb |
| 2014-10-02 | 5701-010-0925 | 4.02 ppb |
| 2014-10-02 | 5701-013-1125 | 6.00 ppb |
| 2014-11-05 | 5701-016-1153 | 6.60 ppb |
| 2014-11-05 | 5701-020-1043 | 6.63 ppb |
| 2014-11-05 | 5701-021-1120 | 5.22 ppb |
| 2014-11-05 | 5701-032-1455 | 4.99 ppb |
| 2015-02-03 | 5810-013-1115 | ND |
| 2015-02-03 | 5810-015-0916 | ND |
| 2015-02-03 | 5810-021-1002 | ND |
| 2015-02-10 | 5810-032-1352 | ND |
| 2015-03-05 | 5810-022-1100 | ND |
| 2015-04-09 | 5810-008-1100 | ND |
| 2015-04-09 | 5810-020-1201 | ND |
| 2015-05-13 | 5810-018-1347 | ND |
| 2015-08-04 | 5810-023-0948 | ND |
| 2015-08-04 | 5810-035-0915 | ND |
| 2015-09-02 | 5701-032-1200 | ND |
| 2015-09-15 | 5810-032-1220 | ND |
| 2015-09-15 | 5810-057-1240 | ND |
| 2015-10-06 | 5810-002-1300 | ND |
| 2015-12-09 | 5701-032-1137 | 8.07 ppb |
| 2016-03-08 | 5701-032-1100 | ND |
| 2016-03-23 | 5810-028-1120 | ND |
| 2016-03-23 | 5810-030-1140 | ND |
| 2016-06-01 | 5701-032-1032 | 10.3 ppb |
| 2016-06-01 | 5701-032-1036 | 10.4 ppb |
| 2016-06-15 | 5810-024-1245 | ND |
| 2016-08-09 | 5810-037-1310 | ND |
| 2016-09-07 | 5810-029-1322 | ND |
| 2016-09-07 | 5701-032-1341 | ND |
| 2016-12-05 | 5701-032-1308 | ND |
| 2016-12-05 | 5701-032-1311 | ND |
| 2017-01-11 | 5810-010-1245 | ND |
| 2017-01-11 | 5810-011-1300 | ND |
| 2017-03-08 | 5701-032-1055 | ND |
| 2017-06-07 | 5701-032-1300 | ND |
| 2017-09-12 | 5701-032-1233 | ND |
| 2017-10-11 | 5810-016-1215 | ND |
| 2017-12-06 | 5701-032-1226 | ND |
| 2018-02-12 | 5810-013-1230 | ND |
| 2018-02-12 | 5810-021-1415 | ND |
| 2018-03-20 | 5701-032-1340 | ND |
| 2018-05-08 | 5810-018-1335 | ND |
| 2018-05-16 | 5810-023-1020 | ND |
| 2018-06-06 | 5701-032-1326 | ND |
| 2018-07-10 | 5810-008-1305 | ND |
| 2018-08-08 | 5810-022-1335 | ND |
| 2018-09-18 | 5701-032-1315 | ND |
| 2018-09-18 | 5810-032-1320 | ND |
| 2018-09-18 | 5810-035-1347 | ND |
| 2018-09-18 | 5810-057-1225 | ND |
| 2018-10-10 | 5810-002-1431 | ND |
| 2018-12-05 | 5701-032-1610 | ND |
| 2018-12-26 | 5810-020-1420 | ND |
| 2019-03-05 | 5701-032-1223 | ND |
| 2019-03-19 | 5810-028-1357 | ND |
| 2019-03-19 | 5810-030-1343 | ND |
| 2019-06-05 | 5701-032-1538 | ND |
| 2019-06-18 | 5810-024-1336 | ND |
| 2019-08-20 | 5810-037-1125 | ND |
| 2019-09-11 | 5810-029-1418 | ND |
| 2019-09-11 | 5810-032-1530 | ND |
| 2019-12-03 | 5701-032-1437 | ND |