Chromium (hexavalent)
Ontario Municipal Utilities Company
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).
170
Samples
0
Samples exceeding legal limit (MCL)
170
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 2.99 ppb | 60 | 60 | 0.160 ppb - 7.60 ppb |
| 2014 | 3.31 ppb | 74 | 74 | 0.740 ppb - 8.10 ppb |
| 2015 | 3.25 ppb | 20 | 20 | 0.710 ppb - 5.70 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 3.73 ppb | 15 | 15 | 1.50 ppb - 6.60 ppb |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 5.10 ppb | 1 | 1 | 5.10 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 |
|---|---|---|
| 2013-06-04 | B3F0340-03 | 2.30 ppb |
| 2013-06-04 | B3F0340-01 | 3.20 ppb |
| 2013-06-04 | B3F0340-11 | 3.40 ppb |
| 2013-06-04 | B3F0340-09 | 5.60 ppb |
| 2013-06-04 | B3F0340-07 | 1.10 ppb |
| 2013-06-04 | B3F0340-15 | 3.30 ppb |
| 2013-06-04 | B3F0340-13 | 1.20 ppb |
| 2013-06-04 | B3F0340-05 | 2.00 ppb |
| 2013-06-05 | B3F0557-01 | 3.10 ppb |
| 2013-06-05 | B3F0557-03 | 3.30 ppb |
| 2013-06-05 | B3F0557-05 | 4.20 ppb |
| 2013-06-05 | B3F0557-09 | 2.90 ppb |
| 2013-06-05 | B3F0557-07 | 3.60 ppb |
| 2013-06-05 | B3F0557-11 | 2.90 ppb |
| 2013-06-06 | B3F0707-11 | 2.50 ppb |
| 2013-06-06 | B3F0707-13 | 3.10 ppb |
| 2013-06-06 | B3F0707-07 | 4.90 ppb |
| 2013-06-06 | B3F0707-05 | 5.50 ppb |
| 2013-06-06 | B3F0707-03 | 7.60 ppb |
| 2013-06-06 | B3F0707-01 | 6.80 ppb |
| 2013-06-06 | B3F0707-09 | 4.30 ppb |
| 2013-06-07 | B3F0790-05 | 3.30 ppb |
| 2013-06-07 | B3F0790-01 | 1.90 ppb |
| 2013-06-07 | B3F0790-13 | 2.40 ppb |
| 2013-06-07 | B3F0781-01 | 0.300 ppb |
| 2013-06-07 | B3F0790-11 | 0.260 ppb |
| 2013-06-07 | B3F0790-07 | 1.50 ppb |
| 2013-06-07 | B3F0790-03 | 0.260 ppb |
| 2013-06-12 | B3F1409-01 | 2.10 ppb |
| 2013-09-10 | B3I0873-07 | 0.170 ppb |
| 2013-09-10 | B3I0873-01 | 0.160 ppb |
| 2013-09-10 | B3I0873-04 | 0.170 ppb |
| 2013-12-03 | B3L0312-07 | 3.50 ppb |
| 2013-12-03 | B3L0312-04 | 2.60 ppb |
| 2013-12-03 | B3L0312-01 | 3.90 ppb |
| 2013-12-03 | B3L0312-13 | 3.90 ppb |
| 2013-12-03 | B3L0312-10 | 4.50 ppb |
| 2013-12-03 | B3L0312-16 | 2.10 ppb |
| 2013-12-03 | B3L0312-19 | 2.80 ppb |
| 2013-12-03 | B3L0312-21 | 3.70 ppb |
| 2013-12-04 | B3L0477-13 | 3.60 ppb |
| 2013-12-04 | B3L0477-04 | 4.50 ppb |
| 2013-12-04 | B3L0477-07 | 4.00 ppb |
| 2013-12-04 | B3L0477-01 | 3.50 ppb |
| 2013-12-04 | B3L0477-10 | 3.70 ppb |
| 2013-12-04 | B3L0477-16 | 3.20 ppb |
| 2013-12-05 | B3L0587-13 | 3.70 ppb |
| 2013-12-05 | B3L0587-01 | 7.40 ppb |
| 2013-12-05 | B3L0587-07 | 4.80 ppb |
| 2013-12-05 | B3L0587-10 | 3.10 ppb |
| 2013-12-05 | B3L0587-04 | 3.40 ppb |
| 2013-12-05 | B3L0587-16 | 4.70 ppb |
| 2013-12-06 | B3L0671-01 | 3.80 ppb |
| 2013-12-06 | B3L0671-04 | 2.10 ppb |
| 2013-12-06 | B3L0671-10 | 1.30 ppb |
| 2013-12-06 | B3L0671-07 | 2.90 ppb |
| 2013-12-06 | B3L0658-04 | 0.530 ppb |
| 2013-12-06 | B3L0658-01 | 0.520 ppb |
| 2013-12-06 | B3L0658-07 | 1.40 ppb |
| 2013-12-06 | B3L0658-10 | 0.890 ppb |
| 2014-01-22 | 4790-020-0945 | 3.70 ppb |
| 2014-01-22 | 4790-022-0855 | 7.00 ppb |
| 2014-01-22 | 4790-029-1030 | 3.30 ppb |
| 2014-01-22 | 4790-030-0730 | 2.90 ppb |
| 2014-01-22 | 4790-031-0815 | 3.10 ppb |
| 2014-01-27 | 4790-025-0920 | 3.00 ppb |
| 2014-01-27 | 4790-027-0950 | 2.60 ppb |
| 2014-01-28 | 4790-042-0915 | 3.40 ppb |
| 2014-01-29 | 4790-041-1015 | 3.40 ppb |
| 2014-01-29 | 4790-045-0730 | 1.90 ppb |
| 2014-01-31 | 4790-023-0815 | 4.10 ppb |
| 2014-01-31 | 4790-034-0845 | 3.20 ppb |
| 2014-01-31 | 4790-049-0745 | 4.20 ppb |
| 2014-03-04 | B4C0458-07 | 0.780 ppb |
| 2014-03-04 | B4C0458-01 | 0.790 ppb |
| 2014-03-04 | B4C0458-04 | 0.740 ppb |
| 2014-04-09 | 4790-045-0930 | 1.90 ppb |
| 2014-04-09 | 4790-046-0950 | 2.20 ppb |
| 2014-04-09 | 4790-048-1025 | 2.90 ppb |
| 2014-04-17 | 4790-017-1035 | 2.70 ppb |
| 2014-04-17 | 4790-023-1120 | 7.70 ppb |
| 2014-04-17 | 4790-025-0945 | 4.00 ppb |
| 2014-04-17 | 4790-030-0920 | 3.50 ppb |
| 2014-04-17 | 4790-041-1030 | 4.30 ppb |
| 2014-04-22 | 4790-022-0855 | 6.60 ppb |
| 2014-04-22 | 4790-027-0845 | 2.70 ppb |
| 2014-04-22 | 4790-029-0750 | 3.20 ppb |
| 2014-04-22 | 4790-042-0950 | 3.40 ppb |
| 2014-04-22 | 4790-049-0815 | 3.30 ppb |
| 2014-05-05 | 4790-022-0835 | 6.70 ppb |
| 2014-05-05 | 4790-023-0800 | 2.90 ppb |
| 2014-05-05 | 4790-031-0845 | 3.60 ppb |
| 2014-05-05 | 4790-032-0820 | 3.20 ppb |
| 2014-05-05 | 4790-040-0815 | 4.30 ppb |
| 2014-05-21 | 4790-043-0900 | 1.20 ppb |
| 2014-05-21 | 4790-044-1000 | 1.40 ppb |
| 2014-06-05 | 4790-043-1125 | 1.80 ppb |
| 2014-07-07 | 4790-041-0945 | 3.40 ppb |
| 2014-07-11 | 4790-017-0925 | 2.10 ppb |
| 2014-07-11 | 4790-020-1020 | 3.40 ppb |
| 2014-07-11 | 4790-045-0825 | 2.20 ppb |
| 2014-07-14 | 4790-046-0800 | 1.90 ppb |
| 2014-07-14 | 4790-048-0910 | 2.60 ppb |
| 2014-07-24 | 4790-029-0830 | 3.70 ppb |
| 2014-07-24 | 4790-031-0915 | 3.40 ppb |
| 2014-07-28 | 4790-026-0900 | 3.50 ppb |
| 2014-07-29 | 4790-022-1020 | 6.70 ppb |
| 2014-07-29 | 4790-025-0950 | 2.80 ppb |
| 2014-07-29 | 4790-034-0945 | 2.60 ppb |
| 2014-07-29 | 4790-040-1040 | 3.30 ppb |
| 2014-07-31 | 4790-027-0900 | 2.80 ppb |
| 2014-07-31 | 4790-042-0930 | 3.90 ppb |
| 2014-08-12 | 4790-040-0845 | 3.90 ppb |
| 2014-08-12 | 4790-049-0800 | 4.30 ppb |
| 2014-08-19 | 4790-032-0815 | 3.10 ppb |
| 2014-08-19 | 4790-034-0900 | 2.80 ppb |
| 2014-10-15 | 4790-017-1000 | 3.50 ppb |
| 2014-10-15 | 4790-025-1100 | 3.40 ppb |
| 2014-10-16 | 4790-045-0815 | 2.00 ppb |
| 2014-10-16 | 4790-046-0910 | 2.00 ppb |
| 2014-10-16 | 4790-048-1000 | 2.70 ppb |
| 2014-10-22 | 4790-020-0915 | 4.10 ppb |
| 2014-10-22 | 4790-023-0955 | 5.60 ppb |
| 2014-10-22 | 4790-031-1115 | 3.00 ppb |
| 2014-10-22 | 4790-034-0840 | 3.10 ppb |
| 2014-10-22 | 4790-049-1040 | 4.90 ppb |
| 2014-10-28 | 4790-041-0850 | 4.00 ppb |
| 2014-10-28 | 4790-043-0820 | 2.00 ppb |
| 2014-10-28 | 4790-044-0800 | 2.20 ppb |
| 2014-11-06 | 4790-022-1010 | 8.10 ppb |
| 2014-11-06 | 4790-026-0915 | 2.50 ppb |
| 2014-11-07 | 4790-030-0930 | 2.10 ppb |
| 2014-12-04 | 4790-027-1020 | 2.50 ppb |
| 2014-12-04 | 4790-042-0945 | 3.40 ppb |
| 2015-01-22 | 4790-029-0830 | 3.20 ppb |
| 2015-01-22 | 4790-043-0745 | 1.80 ppb |
| 2015-01-22 | 4790-045-0730 | 2.10 ppb |
| 2015-01-22 | 4790-048-0805 | 2.50 ppb |
| 2015-01-28 | 4790-020-1035 | 2.80 ppb |
| 2015-01-28 | 4790-023-1000 | 4.80 ppb |
| 2015-01-28 | 4790-032-0930 | 3.30 ppb |
| 2015-01-30 | 4790-027-0930 | 2.80 ppb |
| 2015-01-30 | 4790-042-1000 | 3.60 ppb |
| 2015-02-09 | 4790-017-0900 | 2.80 ppb |
| 2015-02-09 | 4790-025-0935 | 3.40 ppb |
| 2015-02-09 | 4790-041-0830 | 3.60 ppb |
| 2015-02-12 | 4790-022-0915 | 5.70 ppb |
| 2015-02-12 | 4790-026-0855 | 3.70 ppb |
| 2015-02-12 | 4790-034-0745 | 3.50 ppb |
| 2015-02-12 | 4790-040-0830 | 3.90 ppb |
| 2015-02-12 | 4790-046-0800 | 1.80 ppb |
| 2015-02-12 | 4790-049-0850 | 4.00 ppb |
| 2015-05-07 | 4790-050-1042 | 5.00 ppb |
| 2015-07-16 | B5G1760-01 | 0.710 ppb |
| 2017-02-01 | 4790-050-0831 | 6.60 ppb |
| 2017-05-02 | 4790-030-0750 | 3.10 ppb |
| 2017-07-03 | 4790-042-0910 | 3.90 ppb |
| 2017-07-03 | 4790-043-1110 | 2.00 ppb |
| 2017-07-03 | 4790-044-1015 | 1.50 ppb |
| 2017-07-06 | 4790-025-0955 | 4.20 ppb |
| 2017-07-12 | 4790-031-1130 | 4.00 ppb |
| 2017-07-12 | 4790-034-0910 | 3.40 ppb |
| 2017-07-12 | 4790-041-0815 | 4.10 ppb |
| 2017-07-12 | 4790-049-1055 | 4.50 ppb |
| 2017-07-19 | 4790-020-0730 | 3.60 ppb |
| 2017-07-19 | 4790-026-0930 | 6.00 ppb |
| 2017-07-19 | 4790-032-0835 | 3.80 ppb |
| 2017-07-19 | 4790-045-1050 | 2.40 ppb |
| 2017-08-03 | 4790-048-0815 | 2.80 ppb |
| 2019-10-30 | 4790-040-0826 | 5.10 ppb |