Chromium (hexavalent)
Oro Valley Water Utility
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).
40
Samples
0
Samples exceeding legal limit (MCL)
40
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | 0.206 ppb | 40 | 40 | 0.0300 ppb - 1.000 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2015-02-04 | 3181533 | 0.0800 ppb |
| 2015-02-04 | 3181522 | 0.210 ppb |
| 2015-02-05 | 3182412 | 0.0400 ppb |
| 2015-02-05 | 3182345 | 0.120 ppb |
| 2015-02-05 | 3182381 | 0.110 ppb |
| 2015-02-05 | 3182364 | 0.0800 ppb |
| 2015-02-05 | 3182336 | 0.0900 ppb |
| 2015-02-11 | 3186747 | 0.0800 ppb |
| 2015-02-11 | 3186693 | 0.190 ppb |
| 2015-02-12 | 3187592 | 0.0300 ppb |
| 2015-02-12 | 3187583 | 0.230 ppb |
| 2015-02-12 | 3187533 | 0.180 ppb |
| 2015-02-12 | 3187542 | 0.0800 ppb |
| 2015-02-12 | 3187554 | 0.130 ppb |
| 2015-02-17 | 3189608 | 0.160 ppb |
| 2015-02-18 | 3190710 | 0.230 ppb |
| 2015-02-18 | 3190597 | 0.710 ppb |
| 2015-02-18 | 3190690 | 0.370 ppb |
| 2015-02-18 | 3190659 | 0.170 ppb |
| 2015-02-18 | 3190648 | 1.000 ppb |
| 2015-08-04 | 3293090 | 0.260 ppb |
| 2015-08-04 | 3293075 | 0.130 ppb |
| 2015-08-06 | 3294821 | 0.130 ppb |
| 2015-08-06 | 3294767 | 0.0900 ppb |
| 2015-08-06 | 3294707 | 0.0900 ppb |
| 2015-08-06 | 3294734 | 0.180 ppb |
| 2015-08-10 | 3296067 | 0.110 ppb |
| 2015-08-10 | 3296116 | 0.190 ppb |
| 2015-08-12 | 3299599 | 0.110 ppb |
| 2015-08-12 | 3299489 | 0.0600 ppb |
| 2015-08-13 | 3300743 | 0.110 ppb |
| 2015-08-13 | 3300734 | 0.750 ppb |
| 2015-08-13 | 3300718 | 0.310 ppb |
| 2015-08-18 | 3303955 | 0.230 ppb |
| 2015-08-18 | 3304004 | 0.0800 ppb |
| 2015-08-19 | 3305857 | 0.170 ppb |
| 2015-08-19 | 3305865 | 0.190 ppb |
| 2015-08-19 | 3305889 | 0.150 ppb |
| 2015-08-19 | 3305899 | 0.540 ppb |
| 2015-09-09 | 3318001 | 0.0700 ppb |