Chromium (hexavalent)
City of Norco
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).
29
Samples
0
Samples exceeding legal limit (MCL)
21
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.306 ppb | 11 | 9 | ND - 1.000 ppb |
| 2015 | 0.343 ppb | 14 | 12 | ND - 1.10 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 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 |
|---|---|---|
| 2014-08-12 | 4790-012-0745 | 0.0460 ppb |
| 2014-08-12 | 4790-013-0820 | 0.0330 ppb |
| 2014-08-12 | 4790-015-0940 | ND |
| 2014-08-12 | 4790-016-0905 | ND |
| 2014-08-20 | B4H2037-01 | 0.180 ppb |
| 2014-08-20 | B4H2037-03 | 0.710 ppb |
| 2014-08-20 | B4H2037-05 | 1.000 ppb |
| 2014-08-26 | B4H2578-01 | 0.350 ppb |
| 2014-08-26 | B4H2578-03 | 0.370 ppb |
| 2014-11-10 | B4K0871-01 | 0.210 ppb |
| 2014-11-10 | B4K0871-03 | 0.470 ppb |
| 2015-02-03 | B5B0293-17 | 0.480 ppb |
| 2015-02-03 | B5B0304-01 | 0.260 ppb |
| 2015-02-03 | B5B0293-05 | 0.0470 ppb |
| 2015-02-03 | B5B0293-11 | 0.270 ppb |
| 2015-02-03 | B5B0293-01 | ND |
| 2015-02-03 | B5B0293-03 | ND |
| 2015-02-03 | B5B0293-13 | 0.420 ppb |
| 2015-02-03 | B5B0304-03 | 0.320 ppb |
| 2015-02-03 | B5B0293-15 | 0.0320 ppb |
| 2015-02-03 | B5B0293-09 | 1.10 ppb |
| 2015-02-10 | B5B0924-01 | 0.670 ppb |
| 2015-02-10 | B5B0924-03 | 0.660 ppb |
| 2015-05-05 | B5E0286-03 | 0.400 ppb |
| 2015-05-05 | B5E0286-01 | 0.140 ppb |
| 2017-05-02 | 3761-012-1420 | ND |
| 2017-05-02 | 3761-016-1240 | ND |
| 2017-05-02 | 3761-015-1310 | ND |
| 2017-05-02 | 3761-013-1350 | ND |