Chromium (total)
Cairo
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2018-02-26 | AJ84558 | ND |
| 2018-05-07 | AJ88936 | ND |
| 2018-07-31 | AJ96067 | ND |
| 2018-11-28 | AK06877 | ND |
| 2019-02-19 | AK11669 | ND |
| 2019-05-14 | AK17456 | ND |
| 2019-07-29 | AK23773 | ND |
| 2019-11-20 | AK37175 | ND |
| 2020-05-11 | AK45785 | ND |
| 2020-07-08 | AK50253 | ND |
| 2020-10-06 | AK61873 | ND |
| 2020-10-07 | AK61992 | ND |
| 2021-03-16 | AK71400 | ND |
| 2021-03-16 | AK71401 | ND |
| 2021-05-10 | AK75017 | ND |
| 2021-05-10 | AK75018 | ND |
| 2021-09-22 | AK86898 | ND |
| 2021-11-16 | AK90889 | ND |
| 2022-02-08 | AK94977 | ND |
| 2022-02-09 | AK95160 | ND |
| 2022-04-20 | AK99445 | ND |
| 2023-04-26 | AL30314 | ND |