Chromium (total)
Avon Water Company
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 | 0.438 ppb | 8 | 2 | ND - 2.40 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 6 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 1 | 0 | ND |
| 2023 | 0.167 ppb | 6 | 1 | ND - 1.000 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 |
|---|---|---|
| 2018-03-05 | D8C0238-03IOC | 1.10 ppb |
| 2018-03-05 | D8C0238-04IOC | 2.40 ppb |
| 2018-03-05 | D8C0238-05IOC | ND |
| 2018-03-05 | D8C0238-06IOC | ND |
| 2018-03-05 | D8C0238-07IOC | ND |
| 2018-03-05 | D8C0238-08IOC | ND |
| 2018-03-05 | D8C0238-01IOCR | ND |
| 2018-03-05 | D8C0238-02IOC | ND |
| 2020-09-18 | IOC1 200590958 | ND |
| 2020-09-18 | IOC1 200590944 | ND |
| 2020-09-18 | IOC1 200590957 | ND |
| 2020-09-18 | IOC1 200590959 | ND |
| 2020-09-18 | IOC1 200590960 | ND |
| 2020-10-27 | IOC1 200595558 | ND |
| 2022-04-22 | CL16578 | ND |
| 2023-03-02 | CN54352 | 1.000 ppb |
| 2023-03-02 | CN54353 | ND |
| 2023-03-03 | CN54370 | ND |
| 2023-03-03 | CN54371 | ND |
| 2023-03-03 | CN54372 | ND |
| 2023-09-21 | CP05612 | ND |