Chromium (total)
Aromas Water District
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 2.00 ppb | 3 | 3 | 1.80 ppb - 2.10 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | 1.10 ppb | 3 | 2 | ND - 1.70 ppb |
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 |
|---|---|---|
| 2020-10-26 | CA3510004_004_004-202010261008 | 2.10 ppb |
| 2020-10-26 | CA3510004_007_007-202010260955 | 1.80 ppb |
| 2020-10-26 | CA3510004_011_011-202010260858 | 2.10 ppb |
| 2023-04-03 | CA3510004_007_007-202304030923 | ND |
| 2023-04-03 | CA3510004_004_004-202304031150 | 1.70 ppb |
| 2023-04-03 | CA3510004_011_011-202304030850 | 1.60 ppb |