Chromium (hexavalent)
California American Water Company - Antelope
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | 6.56 ppb | 56 | 56 | 1.74 ppb - 14.8 ppb |
2014 | 7.25 ppb | 19 | 19 | 1.50 ppb - 13.0 ppb |
2015 | 11.6 ppb | 10 | 10 | 9.39 ppb - 12.7 ppb |
2016 | 10.2 ppb | 7 | 7 | 9.35 ppb - 10.8 ppb |
2017 | 6.78 ppb | 29 | 26 | ND - 15.4 ppb |
2018 | 4.44 ppb | 62 | 33 | ND - 13.0 ppb |
2019 | 4.10 ppb | 41 | 22 | ND - 14.0 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.02 ppb
The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) 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 cancer.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2013-02-05 | 20899601 | 8.63 ppb |
2013-02-05 | 20900601 | 9.77 ppb |
2013-02-06 | 20901101 | 6.91 ppb |
2013-02-06 | 20898701 | 8.89 ppb |
2013-02-06 | 20899201 | 8.67 ppb |
2013-02-06 | 20899401 | 8.67 ppb |
2013-02-06 | 20900301 | 6.01 ppb |
2013-02-06 | 20900401 | 8.68 ppb |
2013-02-11 | 20898901 | 3.21 ppb |
2013-02-11 | 20900701 | 1.74 ppb |
2013-03-05 | 20899901 | 4.41 ppb |
2013-03-05 | 20900001 | 2.94 ppb |
2013-03-05 | 20899001 | 5.29 ppb |
2013-03-05 | 20899301 | 2.70 ppb |
2013-03-11 | 20900101 | 3.95 ppb |
2013-03-11 | 20898801 | 3.46 ppb |
2013-03-11 | 20899501 | 7.64 ppb |
2013-03-11 | 20900901 | 10.3 ppb |
2013-03-12 | 20899101 | 2.94 ppb |
2013-03-12 | 20899801 | 2.93 ppb |
2013-03-12 | 20901001 | 7.59 ppb |
2013-03-12 | 20900201 | 2.55 ppb |
2013-06-27 | 22953801 | 9.47 ppb |
2013-06-27 | 22953701 | 7.57 ppb |
2013-06-27 | 22953601 | 5.08 ppb |
2013-06-27 | 20900801 | 4.91 ppb |
2013-06-27 | 22953901 | 9.54 ppb |
2013-06-27 | 20900501 | 14.8 ppb |
2013-08-07 | 23013901 | 5.03 ppb |
2013-08-07 | 23012401 | 3.51 ppb |
2013-08-07 | 23012601 | 3.74 ppb |
2013-08-07 | 23014401 | 3.54 ppb |
2013-08-08 | 23013801 | 4.24 ppb |
2013-08-08 | 23013101 | 9.30 ppb |
2013-08-08 | 23012901 | 9.37 ppb |
2013-08-08 | 23012301 | 4.58 ppb |
2013-08-08 | 23014301 | 9.60 ppb |
2013-08-08 | 23014001 | 10.2 ppb |
2013-08-12 | 23014801 | 7.37 ppb |
2013-08-12 | 23013601 | 4.43 ppb |
2013-08-12 | 23012701 | 7.31 ppb |
2013-08-12 | 23013001 | 8.39 ppb |
2013-08-12 | 23012501 | 4.42 ppb |
2013-08-12 | 23014601 | 11.4 ppb |
2013-08-13 | 23013301 | 7.66 ppb |
2013-08-13 | 23012201 | 6.57 ppb |
2013-08-13 | 23014701 | 7.53 ppb |
2013-08-13 | 23014101 | 6.62 ppb |
2013-08-15 | 23013701 | 3.03 ppb |
2013-08-15 | 23474501 | 3.83 ppb |
2013-12-12 | 24205601 | 10.5 ppb |
2013-12-12 | 24205401 | 3.24 ppb |
2013-12-12 | 24205501 | 7.94 ppb |
2013-12-12 | 24576201 | 3.23 ppb |
2013-12-12 | 24576101 | 8.53 ppb |
2013-12-12 | 24576001 | 12.8 ppb |
2014-05-06 | 5810-004-1116 | 7.90 ppb |
2014-05-06 | 5810-010-1216 | 1.60 ppb |
2014-05-06 | 5810-011-1038 | 9.20 ppb |
2014-05-06 | 5810-013-1124 | 6.40 ppb |
2014-05-06 | 5810-014-1029 | 5.80 ppb |
2014-05-06 | 5810-018-1307 | 1.50 ppb |
2014-05-07 | 5810-001-0935 | 7.20 ppb |
2014-05-07 | 5810-002-1134 | 4.30 ppb |
2014-05-07 | 5810-007-1100 | 5.30 ppb |
2014-05-07 | 5810-008-1209 | 6.10 ppb |
2014-05-07 | 5810-009-1054 | 3.60 ppb |
2014-05-07 | 5810-016-0930 | 3.30 ppb |
2014-05-07 | 5810-017-1017 | 4.80 ppb |
2014-12-18 | 1225-003-1037 | 11.0 ppb |
2014-12-18 | 5810-003-1037 | 12.0 ppb |
2014-12-18 | 1225-005-0957 | 10.8 ppb |
2014-12-18 | 5810-005-0957 | 12.0 ppb |
2014-12-18 | 1225-006-0900 | 11.8 ppb |
2014-12-18 | 5810-006-0900 | 13.0 ppb |
2015-03-25 | 1225-003-0933 | 12.3 ppb |
2015-03-25 | 1225-005-1020 | 11.3 ppb |
2015-03-25 | 1225-006-1122 | 12.7 ppb |
2015-05-14 | 1225-012-1207 | 9.39 ppb |
2015-06-09 | 1225-003-0933 | 10.9 ppb |
2015-06-09 | 1225-005-1038 | 11.1 ppb |
2015-06-09 | 1225-006-1136 | 12.2 ppb |
2015-09-09 | 1225-003-1248 | 12.0 ppb |
2015-09-09 | 1225-005-1301 | 11.3 ppb |
2015-09-09 | 1225-006-0936 | 12.5 ppb |
2016-03-17 | 1225-003-1005 | 9.79 ppb |
2016-03-17 | 1225-005-1040 | 10.7 ppb |
2016-03-17 | 1225-006-1115 | 10.8 ppb |
2016-06-22 | 1225-005-1203 | 9.71 ppb |
2016-06-22 | 1225-006-1235 | 9.35 ppb |
2016-09-15 | 1225-005-1110 | 10.7 ppb |
2016-12-18 | 1225-005-1558 | 10.3 ppb |
2017-03-01 | 1225-005-0956 | 8.16 ppb |
2017-05-08 | 1225-002-1400 | ND |
2017-05-08 | 1225-009-1000 | 1.72 ppb |
2017-05-08 | 1225-013-0835 | 5.74 ppb |
2017-05-08 | 1225-014-1040 | 5.00 ppb |
2017-05-08 | 1225-016-0855 | 2.98 ppb |
2017-05-08 | 1225-017-1100 | 1.51 ppb |
2017-05-09 | 1225-001-1255 | 8.18 ppb |
2017-05-09 | 1225-005-0815 | 13.1 ppb |
2017-05-09 | 1225-010-1347 | 1.93 ppb |
2017-05-09 | 1225-011-0900 | 11.6 ppb |
2017-05-09 | 1225-012-0930 | 11.4 ppb |
2017-05-09 | 1225-018-1455 | 1.99 ppb |
2017-05-11 | 1225-007-1040 | 4.41 ppb |
2017-05-11 | 1225-008-0956 | 8.48 ppb |
2017-06-05 | 1225-011-0832 | 11.9 ppb |
2017-06-05 | 1225-012-0925 | 15.4 ppb |
2017-08-17 | 1225-004-1127 | 6.31 ppb |
2017-08-17 | 1225-005-0935 | 11.2 ppb |
2017-09-12 | 1225-011-0935 | 6.28 ppb |
2017-09-12 | 1225-012-1256 | 9.83 ppb |
2017-11-08 | 1225-005-0920 | 10.3 ppb |
2017-12-12 | 1225-011-1150 | 6.28 ppb |
2017-12-12 | 1225-012-0900 | 7.94 ppb |
2017-12-18 | 1233-006-1340 | 8.20 ppb |
2017-12-18 | 1233-039-1350 | ND |
2017-12-18 | 1233-040-1355 | 5.70 ppb |
2017-12-18 | 1233-042-1345 | ND |
2017-12-27 | 1233-003-1150 | 11.0 ppb |
2018-01-04 | 1233-039-1512 | ND |
2018-01-04 | 1233-040-1355 | ND |
2018-01-04 | 1233-042-1345 | ND |
2018-01-10 | 1233-039-0815 | ND |
2018-01-10 | 1233-040-0820 | ND |
2018-01-10 | 1233-042-0810 | ND |
2018-01-18 | 1233-039-1225 | ND |
2018-01-18 | 1233-040-1230 | ND |
2018-01-18 | 1233-042-1220 | ND |
2018-02-13 | 1225-003-1300 | 12.6 ppb |
2018-02-13 | 1233-003-1300 | 12.0 ppb |
2018-02-13 | 1225-006-1200 | 12.3 ppb |
2018-02-13 | 1233-006-1200 | 11.0 ppb |
2018-02-13 | 1233-039-1210 | ND |
2018-02-13 | 1233-040-1215 | ND |
2018-02-13 | 1233-042-1205 | ND |
2018-02-15 | 1225-005-1210 | 8.65 ppb |
2018-02-27 | 1233-003-1150 | 7.20 ppb |
2018-03-08 | 1225-039-0950 | ND |
2018-03-08 | 1233-039-0950 | ND |
2018-03-08 | 1225-040-0955 | 5.82 ppb |
2018-03-08 | 1233-040-0955 | 5.20 ppb |
2018-03-08 | 1225-042-0945 | ND |
2018-03-08 | 1233-042-0945 | ND |
2018-03-12 | 1225-011-1200 | 3.44 ppb |
2018-03-12 | 1225-012-1050 | 9.07 ppb |
2018-03-15 | 1233-003-1010 | 6.80 ppb |
2018-03-15 | 1233-039-1020 | ND |
2018-03-15 | 1233-040-1025 | 5.40 ppb |
2018-03-15 | 1233-042-1015 | ND |
2018-03-23 | 1233-039-0920 | ND |
2018-03-23 | 1233-040-0925 | 4.80 ppb |
2018-03-23 | 1233-042-0915 | ND |
2018-03-28 | 1233-039-0950 | ND |
2018-03-28 | 1233-040-0955 | 5.70 ppb |
2018-03-28 | 1233-042-0945 | ND |
2018-04-03 | 1225-039-0940 | ND |
2018-04-03 | 1233-039-0940 | ND |
2018-04-03 | 1225-040-0945 | 6.12 ppb |
2018-04-03 | 1233-040-0945 | 6.10 ppb |
2018-04-03 | 1233-042-0935 | ND |
2018-05-02 | 1225-003-1135 | 11.9 ppb |
2018-05-02 | 1233-003-1135 | 13.0 ppb |
2018-05-02 | 1225-005-0945 | 9.55 ppb |
2018-05-02 | 1225-006-1040 | 10.3 ppb |
2018-05-02 | 1233-006-1040 | 10.00 ppb |
2018-05-02 | 1225-011-0845 | 4.76 ppb |
2018-05-02 | 1225-012-1010 | 8.49 ppb |
2018-05-02 | 1225-039-1050 | ND |
2018-05-02 | 1225-040-1055 | 3.00 ppb |
2018-05-02 | 1225-042-1045 | ND |
2018-06-20 | 1225-039-1200 | ND |
2018-06-20 | 1225-040-1205 | 3.36 ppb |
2018-06-20 | 1225-042-1155 | ND |
2018-08-07 | 1225-011-1120 | 3.77 ppb |
2018-08-07 | 1225-012-1030 | 9.43 ppb |
2018-08-14 | 1233-003-1130 | 12.0 ppb |
2018-08-14 | 1233-006-1000 | 10.00 ppb |
2018-11-05 | 1225-011-0925 | 9.28 ppb |
2018-11-06 | 1225-012-1015 | 10.2 ppb |
2018-11-09 | 1233-003-1000 | 11.0 ppb |
2018-11-09 | 1233-006-0735 | 13.0 ppb |
2019-01-10 | 1233-039-0850 | ND |
2019-01-10 | 1233-040-0855 | 5.80 ppb |
2019-01-10 | 1233-042-0845 | ND |
2019-02-18 | 1233-003-1305 | 13.0 ppb |
2019-02-18 | 1233-006-1200 | 12.0 ppb |
2019-03-13 | 1233-039-0905 | ND |
2019-03-13 | 1233-040-0910 | 4.80 ppb |
2019-03-13 | 1233-042-0900 | ND |
2019-04-10 | 1233-039-0832 | ND |
2019-04-10 | 1233-040-0835 | 1.50 ppb |
2019-04-10 | 1233-042-0830 | ND |
2019-05-16 | 1233-003-1140 | 9.90 ppb |
2019-05-16 | 1233-006-1120 | 12.0 ppb |
2019-05-16 | 1225-012-1221 | 11.1 ppb |
2019-06-12 | 1233-039-0828 | ND |
2019-06-12 | 1233-040-0831 | 4.90 ppb |
2019-06-12 | 1233-042-0825 | ND |
2019-07-23 | 1233-039-0828 | ND |
2019-07-23 | 1233-040-0831 | 1.40 ppb |
2019-07-23 | 1233-042-0825 | ND |
2019-08-06 | 1233-003-1300 | 14.0 ppb |
2019-08-06 | 1233-006-0830 | 10.00 ppb |
2019-08-06 | 1233-039-0836 | 3.70 ppb |
2019-08-06 | 1233-040-0840 | 3.00 ppb |
2019-08-06 | 1233-042-0833 | ND |
2019-08-08 | 1225-012-1358 | 10.2 ppb |
2019-09-10 | 1233-039-0835 | ND |
2019-09-10 | 1233-040-0838 | 2.70 ppb |
2019-09-10 | 1233-042-0832 | ND |
2019-10-16 | 1233-039-0935 | ND |
2019-10-16 | 1233-040-0940 | 3.40 ppb |
2019-10-16 | 1233-042-0930 | ND |
2019-11-05 | 1233-003-1325 | 14.0 ppb |
2019-11-05 | 1233-006-1225 | 14.0 ppb |
2019-11-05 | 1225-012-1705 | 9.93 ppb |
2019-11-05 | 1233-039-1235 | ND |
2019-11-05 | 1233-040-1240 | 4.00 ppb |
2019-11-05 | 1233-042-1230 | ND |
2019-12-09 | 1233-039-0820 | ND |
2019-12-09 | 1233-040-0825 | 3.00 ppb |
2019-12-09 | 1233-042-0815 | ND |