Chromium (total)
Town of Annetta Deer Creek
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 | 1.50 ppb | 3 | 2 | ND - 2.50 ppb |
| 2019 | 3.17 ppb | 3 | 3 | 2.50 ppb - 4.00 ppb |
| 2020 | 3.55 ppb | 2 | 1 | ND - 7.10 ppb |
| 2021 | 2.13 ppb | 3 | 2 | ND - 5.30 ppb |
| 2022 | 2.20 ppb | 3 | 1 | ND - 6.60 ppb |
| 2023 | 1.60 ppb | 2 | 1 | ND - 3.20 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 |
|---|---|---|
| 2018-08-06 | Q1830996003 | 2.50 ppb |
| 2018-08-06 | Q1830996013 | ND |
| 2018-12-03 | Q1849051003 | 2.00 ppb |
| 2019-06-03 | Q1930677025 | 3.00 ppb |
| 2019-06-03 | Q1930677026 | 4.00 ppb |
| 2019-06-03 | Q1930677027 | 2.50 ppb |
| 2020-04-21 | Q2015803026 | 7.10 ppb |
| 2020-08-27 | Q2034434013 | ND |
| 2021-02-01 | Q2102857016 | 1.10 ppb |
| 2021-02-01 | Q2102857017 | ND |
| 2021-05-24 | Q2113349005 | 5.30 ppb |
| 2022-02-07 | Q2204015002 | ND |
| 2022-03-10 | Q2208362002 | 6.60 ppb |
| 2022-11-17 | Q2234711002 | ND |
| 2023-11-08 | Q2348107024 | 3.20 ppb |
| 2023-11-08 | Q2348107025 | ND |