Chromium (hexavalent)
Redlands City
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).
99
Samples
0
Samples exceeding legal limit (MCL)
61
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 1.22 ppb | 44 | 44 | 0.210 ppb - 7.00 ppb |
| 2014 | 0.701 ppb | 27 | 11 | ND - 6.60 ppb |
| 2015 | 0.250 ppb | 6 | 1 | ND - 1.50 ppb |
| 2016 | ND | 1 | 0 | ND |
| 2017 | 0.870 ppb | 20 | 5 | ND - 6.50 ppb |
| 2018 | ND | 1 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2013-03-07 | 201303080067AM | 0.340 ppb |
| 2013-03-07 | 201303080061AM | 0.320 ppb |
| 2013-03-07 | 201303080063AM | 0.330 ppb |
| 2013-03-07 | 201303080065AM | 0.540 ppb |
| 2013-04-09 | 201304100196AM | 7.00 ppb |
| 2013-04-09 | 201304100184AM | 0.450 ppb |
| 2013-04-09 | 201304100194AM | 5.20 ppb |
| 2013-04-09 | 201304100192AM | 0.520 ppb |
| 2013-04-09 | 201304100190AM | 0.430 ppb |
| 2013-04-09 | 201304100188AM | 6.10 ppb |
| 2013-04-09 | 201304100186AM | 0.380 ppb |
| 2013-05-16 | 201305160481AM | 0.410 ppb |
| 2013-05-16 | 201305160485AM | 0.320 ppb |
| 2013-05-16 | 201305160487AM | 0.620 ppb |
| 2013-05-16 | 201305160483AM | 0.620 ppb |
| 2013-05-16 | 201305160479AM | 0.550 ppb |
| 2013-05-20 | 201305210004AM | 1.10 ppb |
| 2013-05-20 | 201305210005AM | 0.460 ppb |
| 2013-06-06 | 201306060432AM | 0.350 ppb |
| 2013-06-06 | 201306060430AM | 0.330 ppb |
| 2013-09-10 | 201309100777AM | 0.580 ppb |
| 2013-09-10 | 201309100775AM | 0.270 ppb |
| 2013-09-10 | 201309100779AM | 0.380 ppb |
| 2013-09-10 | 201309100773AM | 0.210 ppb |
| 2013-10-17 | 201310180198AM | 0.440 ppb |
| 2013-10-17 | 201310180221AM | 0.330 ppb |
| 2013-10-17 | 201310180202AM | 6.60 ppb |
| 2013-10-17 | 201310180200AM | 0.370 ppb |
| 2013-10-17 | 201310180208AM | 3.80 ppb |
| 2013-10-17 | 201310180210AM | 6.60 ppb |
| 2013-10-17 | 201310180206AM | 0.390 ppb |
| 2013-10-17 | 201310180204AM | 0.420 ppb |
| 2013-10-17 | 201310180219AM | 0.380 ppb |
| 2013-10-17 | 201310180217AM | 0.400 ppb |
| 2013-10-17 | 201310180223AM | 0.940 ppb |
| 2013-11-26 | 201311260956AM | 0.590 ppb |
| 2013-11-26 | 201311260952AM | 0.620 ppb |
| 2013-11-26 | 201311260954AM | 0.560 ppb |
| 2013-11-26 | 201311260944AM | 1.000 ppb |
| 2013-11-26 | 201311260950AM | 0.490 ppb |
| 2013-11-26 | 201311260946AM | 0.550 ppb |
| 2013-11-26 | 201311260948AM | 0.570 ppb |
| 2013-12-19 | 201312190647AM | 0.300 ppb |
| 2013-12-19 | 201312190649AM | 0.330 ppb |
| 2014-01-06 | 201401060267AM | 0.560 ppb |
| 2014-01-06 | 201401060269AM | 0.570 ppb |
| 2014-01-07 | 9590-053-1035 | 6.60 ppb |
| 2014-02-24 | 9590-053-0825 | 6.10 ppb |
| 2014-04-24 | 201404240685AM | 0.720 ppb |
| 2014-04-24 | 201404240687AM | 0.430 ppb |
| 2014-04-29 | 201404300397AM | 0.320 ppb |
| 2014-04-30 | 201405010264AM | 0.890 ppb |
| 2014-07-28 | 201407280357AM | 0.790 ppb |
| 2014-07-28 | 201407280359AM | 0.860 ppb |
| 2014-08-28 | 9590-019-0910 | ND |
| 2014-10-02 | 9590-008-1000 | ND |
| 2014-10-30 | 9590-070-1145 | ND |
| 2014-10-30 | 9590-054-1125 | ND |
| 2014-11-06 | 9590-025-0905 | ND |
| 2014-11-06 | 9590-031-1020 | ND |
| 2014-11-06 | 9590-029-1030 | ND |
| 2014-11-06 | 9590-019-0915 | ND |
| 2014-11-06 | 9590-022-0845 | ND |
| 2014-11-06 | 9590-017-1000 | ND |
| 2014-11-06 | 9590-010-0930 | ND |
| 2014-11-06 | 9590-008-0855 | ND |
| 2014-11-06 | 9590-003-1035 | 1.10 ppb |
| 2014-11-06 | 9590-002-1015 | ND |
| 2014-11-13 | 9590-069-1030 | ND |
| 2014-12-11 | 9590-062-0945 | ND |
| 2014-12-16 | 9590-055-1115 | ND |
| 2015-01-08 | 9590-025-1850 | ND |
| 2015-01-08 | 9590-022-0945 | ND |
| 2015-04-17 | 9590-005-1015 | 1.50 ppb |
| 2015-04-20 | 9590-021-0905 | ND |
| 2015-05-21 | 9590-026-1120 | ND |
| 2015-10-21 | 9590-070-1035 | ND |
| 2016-05-12 | 9590-026-0915 | ND |
| 2017-03-23 | 5810-010-1115 | ND |
| 2017-03-23 | 5810-019-0855 | ND |
| 2017-03-23 | 5810-009-1030 | ND |
| 2017-03-23 | 5810-008-0925 | ND |
| 2017-03-30 | 5810-053-1020 | 6.50 ppb |
| 2017-03-31 | 5810-005-0835 | 1.70 ppb |
| 2017-04-12 | 5810-053-1355 | 6.20 ppb |
| 2017-05-03 | 5810-062-1020 | ND |
| 2017-05-18 | 5810-021-1035 | ND |
| 2017-05-18 | 5810-029-1110 | ND |
| 2017-05-18 | 5810-017-0945 | ND |
| 2017-05-18 | 5810-054-1000 | ND |
| 2017-05-18 | 5810-055-1055 | ND |
| 2017-05-18 | 5810-069-1045 | ND |
| 2017-05-18 | 5810-070-1030 | ND |
| 2017-06-15 | 5810-031-0930 | ND |
| 2017-06-22 | 5810-022-0810 | 1.20 ppb |
| 2017-06-22 | 5810-025-0830 | ND |
| 2017-06-22 | 5810-003-0920 | 1.80 ppb |
| 2017-12-29 | 5810-002-0840 | ND |
| 2018-04-19 | 5810-026-0900 | ND |