Chromium (total)
Hynes Estates Mutual 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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 9 | 0 | ND |
| 2021 | 1.10 ppb | 1 | 1 | 1.10 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | 2.65 ppb | 2 | 2 | 2.20 ppb - 3.10 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 |
|---|---|---|
| 2019-07-10 | CA3000519_005_005-201907101130 | ND |
| 2019-11-07 | CA3000519_005_005-201911071310 | ND |
| 2020-02-04 | CA3000519_005_005-202002041035 | ND |
| 2020-03-12 | CA3000519_005_005-202003121015 | ND |
| 2020-03-12 | CA3000519_005_005-202003121025 | ND |
| 2020-05-05 | CA3000519_005_005-202005051010 | ND |
| 2020-05-05 | CA3000519_001_001-202005051030 | ND |
| 2020-05-21 | CA3000519_001_001-202005211100 | ND |
| 2020-05-21 | CA3000519_001_001-202005211105 | ND |
| 2020-06-16 | CA3000519_001_001-202006161000 | ND |
| 2020-11-17 | CA3000519_001_001-202011170905 | ND |
| 2021-08-03 | CA3000519_005_005-202108031005 | 1.10 ppb |
| 2023-02-01 | CA3000519_001_001-202302011115 | 3.10 ppb |
| 2023-07-13 | CA3000519_005_005-202307131025 | 2.20 ppb |