Chromium (total)
Myoma Dunes 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 | 14.3 ppb | 4 | 4 | 13.0 ppb - 15.0 ppb |
| 2019 | 12.1 ppb | 8 | 8 | 10.00 ppb - 15.0 ppb |
| 2020 | 12.3 ppb | 6 | 6 | 11.0 ppb - 14.0 ppb |
| 2021 | 12.4 ppb | 5 | 5 | 11.0 ppb - 14.0 ppb |
| 2022 | 11.8 ppb | 12 | 12 | 10.00 ppb - 14.0 ppb |
| 2023 | 15.6 ppb | 5 | 5 | 14.0 ppb - 17.0 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 |
|---|---|---|
| 2018-11-19 | CA3310051_007_007-201811191011 | 15.0 ppb |
| 2018-11-19 | CA3310051_009_009-201811191449 | 13.0 ppb |
| 2018-11-19 | CA3310051_008_008-201811191033 | 15.0 ppb |
| 2018-12-17 | CA3310051_011_011-201812170935 | 14.0 ppb |
| 2019-04-01 | CA3310051_010_010-201904010730 | 11.0 ppb |
| 2019-11-18 | CA3310051_007_007-201911180856 | 15.0 ppb |
| 2019-11-18 | CA3310051_007_007-201911180752 | 15.0 ppb |
| 2019-11-18 | CA3310051_011_011-201911180951 | 13.0 ppb |
| 2019-11-18 | CA3310051_007_007-201911180827 | 13.0 ppb |
| 2019-11-22 | CA3310051_010_010-201911220920 | 10.00 ppb |
| 2019-11-22 | CA3310051_009_009-201911220845 | 10.00 ppb |
| 2019-11-22 | CA3310051_010_010-201911220939 | 10.00 ppb |
| 2020-08-20 | CA3310051_011_011-202008201215 | 12.0 ppb |
| 2020-08-24 | CA3310051_008_008-202008241200 | 14.0 ppb |
| 2020-08-24 | CA3310051_009_009-202008241045 | 12.0 ppb |
| 2020-08-24 | CA3310051_009_009-202008241030 | 12.0 ppb |
| 2020-08-24 | CA3310051_007_007-202008241138 | 13.0 ppb |
| 2020-08-24 | CA3310051_010_010-202008241335 | 11.0 ppb |
| 2021-08-23 | CA3310051_011_011-202108230733 | 12.0 ppb |
| 2021-08-23 | CA3310051_010_010-202108230658 | 11.0 ppb |
| 2021-08-23 | CA3310051_009_009-202108230746 | 11.0 ppb |
| 2021-08-23 | CA3310051_007_007-202108230842 | 14.0 ppb |
| 2021-08-23 | CA3310051_008_008-202108230904 | 14.0 ppb |
| 2022-08-16 | CA3310051_010_010-202208160723 | 10.00 ppb |
| 2022-08-16 | CA3310051_011_011-202208160659 | 12.0 ppb |
| 2022-08-16 | CA3310051_009_009-202208160759 | 11.0 ppb |
| 2022-08-16 | CA3310051_008_008-202208160834 | 13.0 ppb |
| 2022-08-16 | CA3310051_007_007-202208160856 | 14.0 ppb |
| 2022-08-19 | CA3310051_010_010-202208190749 | 10.00 ppb |
| 2022-08-19 | CA3310051_010_010-202208190715 | 10.00 ppb |
| 2022-08-19 | CA3310051_011_011-202208190752 | 12.0 ppb |
| 2022-08-19 | CA3310051_011_011-202208190700 | 11.0 ppb |
| 2022-08-19 | CA3310051_008_008-202208190935 | 14.0 ppb |
| 2022-08-19 | CA3310051_009_009-202208190919 | 11.0 ppb |
| 2022-08-19 | CA3310051_007_007-202208190903 | 13.0 ppb |
| 2023-08-22 | CA3310051_008_008-202308220730 | 17.0 ppb |
| 2023-08-22 | CA3310051_011_011-202308221011 | 14.0 ppb |
| 2023-08-22 | CA3310051_007_007-202308220743 | 17.0 ppb |
| 2023-08-22 | CA3310051_009_009-202308220753 | 14.0 ppb |
| 2023-08-22 | CA3310051_010_010-202308220857 | 16.0 ppb |