Chromium (total)
Applehill Farm 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 | 0.600 ppb | 2 | 1 | ND - 1.20 ppb |
| 2019 | 1.15 ppb | 2 | 1 | ND - 2.30 ppb |
| 2020 | ND | 2 | 0 | ND |
| 2021 | 0.750 ppb | 2 | 1 | ND - 1.50 ppb |
| 2022 | 0.550 ppb | 2 | 1 | ND - 1.10 ppb |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2020-06-17 | AW11405-INP | ND |
| 2020-12-09 | AW23542-INP | ND |
| 2021-05-19 | AX09625-INP | ND |
| 2021-10-27 | AX21685-INP | 1.50 ppb |
| 2022-06-08 | AY09683-INP | 1.10 ppb |
| 2022-10-06 | AY18083-INP | ND |
| 2023-05-22 | AZ09222-INP | ND |
| 2023-11-15 | AZ21006-INP | ND |