Chromium (hexavalent)
City of Colton
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).
70
Samples
0
Samples exceeding legal limit (MCL)
50
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.553 ppb | 22 | 19 | ND - 2.00 ppb |
| 2014 | 0.758 ppb | 33 | 24 | ND - 2.50 ppb |
| 2015 | 1.80 ppb | 1 | 1 | 1.80 ppb |
| 2016 | 1.70 ppb | 1 | 1 | 1.70 ppb |
| 2017 | 0.780 ppb | 10 | 4 | ND - 2.20 ppb |
| 2018 | 0.950 ppb | 2 | 1 | ND - 1.90 ppb |
| 2019 | ND | 1 | 0 | ND |
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 |
|---|---|---|
| 2013-10-22 | 3J23048-03A | 0.340 ppb |
| 2013-10-22 | 3J23048-01A | 0.290 ppb |
| 2013-10-22 | 3J23048-05A | 0.290 ppb |
| 2013-10-22 | 3J23048-07A | 0.330 ppb |
| 2013-10-23 | 3J24017-01A | 0.350 ppb |
| 2013-10-23 | 3J24017-03A | 0.420 ppb |
| 2013-10-23 | 3J24017-07A | 2.00 ppb |
| 2013-10-23 | 3J24017-15A | 0.0820 ppb |
| 2013-10-23 | 3J24017-13A | 2.00 ppb |
| 2013-10-23 | 3J24017-09A | 0.370 ppb |
| 2013-10-23 | 3J24017-11A | 0.400 ppb |
| 2013-10-23 | 3J24017-05A | 0.0720 ppb |
| 2013-10-28 | 3J29032-07A | 0.0420 ppb |
| 2013-10-28 | 3J29032-01A | 1.000 ppb |
| 2013-10-28 | 3J29032-03A | 0.0490 ppb |
| 2013-10-28 | 3J29032-05A | 1.30 ppb |
| 2013-10-30 | 3J31022-05A | ND |
| 2013-10-30 | 3J31022-07A | 0.0320 ppb |
| 2013-10-30 | 3J31022-01A | ND |
| 2013-10-30 | 3J31022-03A | ND |
| 2013-10-31 | 3K01028-03A | 1.40 ppb |
| 2013-10-31 | 3K01028-01A | 1.40 ppb |
| 2014-04-23 | 4D24039-11A | 0.690 ppb |
| 2014-04-23 | 4D24039-15A | 1.20 ppb |
| 2014-04-23 | 4D24039-13A | 0.960 ppb |
| 2014-04-23 | 4D24039-05A | 0.350 ppb |
| 2014-04-23 | 4D24039-03A | 1.30 ppb |
| 2014-04-23 | 4D24039-07A | 1.20 ppb |
| 2014-04-23 | 4D24039-09A | 0.0540 ppb |
| 2014-04-23 | 4D24039-01A | 0.460 ppb |
| 2014-04-24 | 4D25027-11A | 1.30 ppb |
| 2014-04-24 | 4D25027-03A | 1.20 ppb |
| 2014-04-24 | 4D25027-01A | 0.390 ppb |
| 2014-04-24 | 4D25027-13A | ND |
| 2014-04-24 | 4D25027-09A | 0.0300 ppb |
| 2014-04-24 | 4D25027-05A | 0.0720 ppb |
| 2014-04-24 | 4D25027-15A | 1.20 ppb |
| 2014-04-24 | 4D25027-07A | 1.20 ppb |
| 2014-04-29 | 4D30037-03A | 0.390 ppb |
| 2014-04-29 | 4D30037-07A | 0.390 ppb |
| 2014-04-29 | 4D30037-01A | 1.90 ppb |
| 2014-04-29 | 4D30037-05A | 0.530 ppb |
| 2014-04-29 | 4D30037-11A | 1.80 ppb |
| 2014-04-29 | 4D30037-09A | 2.00 ppb |
| 2014-08-14 | 3761-030-0950 | 1.90 ppb |
| 2014-08-14 | 3761-024-1300 | ND |
| 2014-08-14 | 3761-023-1315 | ND |
| 2014-08-14 | 3761-021-1000 | 2.00 ppb |
| 2014-08-14 | 3761-017-1410 | ND |
| 2014-08-14 | 3761-015-1030 | ND |
| 2014-08-14 | 3761-014-1025 | ND |
| 2014-08-14 | 3761-012-1010 | 2.50 ppb |
| 2014-08-14 | 3761-011-1040 | ND |
| 2014-08-14 | 3761-008-1045 | ND |
| 2014-09-17 | 3761-022-1315 | ND |
| 2015-08-03 | 3761-010-0930 | 1.80 ppb |
| 2016-06-13 | 3761-016-1030 | 1.70 ppb |
| 2017-09-06 | 3761-010-1455 | 2.10 ppb |
| 2017-09-06 | 3761-008-1125 | ND |
| 2017-09-06 | 3761-011-1130 | ND |
| 2017-09-06 | 3761-014-1100 | ND |
| 2017-09-06 | 3761-015-1115 | ND |
| 2017-09-06 | 3761-016-1520 | 1.30 ppb |
| 2017-09-06 | 3761-021-1230 | 2.20 ppb |
| 2017-09-06 | 3761-023-1140 | ND |
| 2017-09-06 | 3761-030-1210 | 2.20 ppb |
| 2017-09-06 | 3761-024-1245 | ND |
| 2018-06-12 | 3761-023-1000 | ND |
| 2018-09-06 | 3761-012-1330 | 1.90 ppb |
| 2019-07-30 | 3761-017-0830 | ND |