Chromium (total)
City of Flagstaff
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.
57
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 |
|---|---|---|---|---|
| 2013 | 1.60 ppb | 18 | 18 | 0.350 ppb - 2.70 ppb |
| 2014 | 0.935 ppb | 26 | 24 | ND - 2.20 ppb |
| 2015 | 0.933 ppb | 6 | 3 | ND - 2.30 ppb |
| 2016 | 0.800 ppb | 2 | 1 | ND - 1.60 ppb |
| 2017 | 0.900 ppb | 3 | 2 | ND - 1.40 ppb |
| 2018 | 2.00 ppb | 1 | 1 | 2.00 ppb |
| 2019 | 1.60 ppb | 1 | 1 | 1.60 ppb |
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 |
|---|---|---|
| 2013-10-23 | 201310240365AM | 0.350 ppb |
| 2013-10-23 | 201310240398AM | 1.10 ppb |
| 2013-10-24 | 201310250061AM | 1.50 ppb |
| 2013-10-24 | 201310250100AM | 1.70 ppb |
| 2013-10-24 | 201310250096AM | 2.20 ppb |
| 2013-10-24 | 201310250083AM | 0.880 ppb |
| 2013-10-24 | 201310250103AM | 1.80 ppb |
| 2013-10-24 | 201310250090AM | 1.90 ppb |
| 2013-10-24 | 201310250063AM | 2.70 ppb |
| 2013-10-24 | 201310250094AM | 1.80 ppb |
| 2013-10-29 | 201310300042AM | 1.40 ppb |
| 2013-10-29 | 201310300068AM | 1.90 ppb |
| 2013-10-29 | 201310300118AM | 2.10 ppb |
| 2013-10-29 | 201310300044AM | 0.620 ppb |
| 2013-10-30 | 201310310165AM | 2.20 ppb |
| 2013-10-30 | 201310310113AM | 1.80 ppb |
| 2013-10-31 | 201311010185AM | 1.90 ppb |
| 2013-10-31 | 201311010176AM | 1.000 ppb |
| 2014-01-29 | 201401300194AM | 0.370 ppb |
| 2014-01-29 | 201401300212AM | 0.530 ppb |
| 2014-01-29 | 201401300186AM | 1.20 ppb |
| 2014-04-30 | 201405020175AM | 0.990 ppb |
| 2014-04-30 | 201405020189AM | 1.60 ppb |
| 2014-04-30 | 201405020177AM | 0.820 ppb |
| 2014-04-30 | 201405020187AM | 1.50 ppb |
| 2014-04-30 | 201405020183AM | 0.710 ppb |
| 2014-04-30 | 201405020165AM | 1.60 ppb |
| 2014-04-30 | 201405020179AM | 0.870 ppb |
| 2014-04-30 | 201405020261AM | 0.610 ppb |
| 2014-04-30 | 201405020267AM | 1.60 ppb |
| 2014-04-30 | 201405020263AM | 0.630 ppb |
| 2014-04-30 | 201405020259AM | 1.40 ppb |
| 2014-04-30 | 201405020163AM | 0.550 ppb |
| 2014-05-02 | 201405060311AM | 2.20 ppb |
| 2014-05-02 | 201405060313AM | 0.630 ppb |
| 2014-05-29 | 201405300269AM | 1.80 ppb |
| 2014-05-29 | 201405300241AM | 0.970 ppb |
| 2014-06-12 | 201406130272AM | 1.000 ppb |
| 2014-06-12 | 201406130296AM | 1.50 ppb |
| 2014-07-17 | 201407180219AM | 0.400 ppb |
| 2014-07-17 | 201407180221AM | ND |
| 2014-07-17 | 201407180226AM | 0.500 ppb |
| 2014-07-17 | 201407180230AM | 0.330 ppb |
| 2014-09-04 | 2014095050485I | ND |
| 2015-03-10 | 201503050252I | ND |
| 2015-04-14 | 201503050251I | ND |
| 2015-07-28 | 201507210370I | 2.30 ppb |
| 2015-07-30 | 201507310184I | 1.000 ppb |
| 2015-08-27 | 201508280194I | ND |
| 2015-09-10 | 201509120269I | 2.30 ppb |
| 2016-07-25 | 201607260412I | ND |
| 2016-08-17 | 201608180220I | 1.60 ppb |
| 2017-07-05 | 201707061058I | ND |
| 2017-08-28 | 201708290222I | 1.40 ppb |
| 2017-08-28 | 201708290221I | 1.30 ppb |
| 2018-08-27 | 201808280602I | 2.00 ppb |
| 2019-04-29 | 201904300311I | 1.60 ppb |