Chromium (total)
City of Norco
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
36
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.254 ppb | 18 | 8 | ND - 0.900 ppb |
| 2015 | 0.316 ppb | 14 | 9 | ND - 1.000 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
EPA Maximum Contaminant
Level (MCL) 100 ppb
The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-05-06 | 3761-012-1338 | ND |
| 2014-05-06 | 3761-013-1305 | ND |
| 2014-05-06 | 3761-015-1228 | ND |
| 2014-05-06 | 3761-016-1148 | ND |
| 2014-08-12 | B4H1135-01 | ND |
| 2014-08-12 | B4H1135-13 | 0.800 ppb |
| 2014-08-12 | B4H1135-03 | ND |
| 2014-08-12 | B4H1135-09 | 0.400 ppb |
| 2014-08-12 | B4H1135-15 | 0.550 ppb |
| 2014-08-12 | B4H1135-11 | ND |
| 2014-08-12 | B4H1135-05 | ND |
| 2014-08-20 | B4H2037-05 | 0.900 ppb |
| 2014-08-20 | B4H2037-01 | ND |
| 2014-08-20 | B4H2037-03 | 0.660 ppb |
| 2014-08-26 | B4H2578-03 | 0.350 ppb |
| 2014-08-26 | B4H2578-01 | 0.320 ppb |
| 2014-11-10 | B4K0871-01 | ND |
| 2014-11-10 | B4K0871-03 | 0.600 ppb |
| 2015-02-03 | B5B0293-03 | ND |
| 2015-02-03 | B5B0293-01 | ND |
| 2015-02-03 | B5B0304-01 | 0.280 ppb |
| 2015-02-03 | B5B0293-05 | ND |
| 2015-02-03 | B5B0293-13 | 0.440 ppb |
| 2015-02-03 | B5B0293-11 | 0.280 ppb |
| 2015-02-03 | B5B0304-03 | 0.300 ppb |
| 2015-02-03 | B5B0293-17 | 0.480 ppb |
| 2015-02-03 | B5B0293-15 | ND |
| 2015-02-03 | B5B0293-09 | 1.000 ppb |
| 2015-02-10 | B5B0924-03 | 0.610 ppb |
| 2015-02-10 | B5B0924-01 | 0.610 ppb |
| 2015-05-05 | B5E0286-03 | 0.420 ppb |
| 2015-05-05 | B5E0286-01 | ND |
| 2017-05-02 | 3761-016-1240 | ND |
| 2017-05-02 | 3761-015-1310 | ND |
| 2017-05-02 | 3761-013-1350 | ND |
| 2017-05-02 | 3761-012-1420 | ND |