Chromium (total)
City of Blackfoot
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.
40
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 | 0.548 ppb | 16 | 16 | 0.280 ppb - 0.900 ppb |
| 2015 | 0.511 ppb | 16 | 16 | 0.300 ppb - 0.990 ppb |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 1.38 ppb | 8 | 6 | ND - 2.00 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 |
|---|---|---|
| 2014-11-24 | 35165420013AM | 0.500 ppb |
| 2014-11-24 | 35165420011AM | 0.280 ppb |
| 2014-11-24 | 35165420015AM | 0.480 ppb |
| 2014-11-24 | 35165420021AM | 0.390 ppb |
| 2014-11-24 | 35165420017AM | 0.780 ppb |
| 2014-11-24 | 35165420003AM | 0.390 ppb |
| 2014-11-24 | 35165420025AM | 0.540 ppb |
| 2014-11-24 | 35165420019AM | 0.530 ppb |
| 2014-11-24 | 35165420001AM | 0.900 ppb |
| 2014-11-24 | 35165420027AM | 0.640 ppb |
| 2014-11-24 | 35165420005AM | 0.730 ppb |
| 2014-11-24 | 35165420031AM | 0.500 ppb |
| 2014-11-24 | 35165420029AM | 0.720 ppb |
| 2014-11-24 | 35165420007AM | 0.320 ppb |
| 2014-11-24 | 35165420009AM | 0.700 ppb |
| 2014-11-24 | 35165420023AM | 0.360 ppb |
| 2015-05-19 | 35189241003AM | 0.570 ppb |
| 2015-05-19 | 35189241001AM | 0.990 ppb |
| 2015-07-20 | 35199172003AM | 0.350 ppb |
| 2015-07-20 | 35199172007AM | 0.300 ppb |
| 2015-07-20 | 35199172023AM | 0.390 ppb |
| 2015-07-20 | 35199172011AM | 0.660 ppb |
| 2015-07-20 | 35199172001AM | 0.420 ppb |
| 2015-07-20 | 35199172009AM | 0.360 ppb |
| 2015-07-20 | 35199172005AM | 0.330 ppb |
| 2015-07-20 | 35199172025AM | 0.500 ppb |
| 2015-07-20 | 35199172013AM | 0.640 ppb |
| 2015-07-20 | 35199172015AM | 0.340 ppb |
| 2015-07-20 | 35199172021AM | 0.360 ppb |
| 2015-07-20 | 35199172019AM | 0.930 ppb |
| 2015-07-20 | 35199172027AM | 0.310 ppb |
| 2015-07-20 | 35199172017AM | 0.730 ppb |
| 2019-10-14 | II91012701 | 2.00 ppb |
| 2019-10-14 | II91012707 | ND |
| 2019-10-14 | II91012706 | 2.00 ppb |
| 2019-10-14 | II91012705 | 2.00 ppb |
| 2019-10-14 | II91012704 | 1.000 ppb |
| 2019-10-14 | II91012703 | 2.00 ppb |
| 2019-10-14 | II91012702 | ND |
| 2019-10-14 | I91012701 | 2.00 ppb |