Chromium (total)
Ward II 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 | ND | 26 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 14 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-05-02 | AE21727 | ND |
| 2018-05-02 | AE21703 | ND |
| 2018-05-02 | AE21727 | ND |
| 2018-05-02 | AE21703 | ND |
| 2018-06-06 | AE21818 | ND |
| 2018-06-06 | AE21815 | ND |
| 2018-06-06 | AE21812 | ND |
| 2018-06-06 | AE21809 | ND |
| 2018-06-06 | AE21812 | ND |
| 2018-06-06 | AE21815 | ND |
| 2018-06-06 | AE21818 | ND |
| 2018-06-06 | AE21821 | ND |
| 2018-06-06 | AE21809 | ND |
| 2018-06-06 | AE21821 | ND |
| 2018-06-25 | AE21992 | ND |
| 2018-06-25 | AE22000 | ND |
| 2018-06-25 | AE21996 | ND |
| 2018-06-25 | AE21992 | ND |
| 2018-06-25 | AE21988 | ND |
| 2018-06-25 | AE21984 | ND |
| 2018-06-25 | AE21984 | ND |
| 2018-06-25 | AE22000 | ND |
| 2018-06-25 | AE21996 | ND |
| 2018-06-25 | AE21988 | ND |
| 2018-09-10 | B1804157-001 | ND |
| 2018-09-10 | B1804157-001 | ND |
| 2019-07-24 | B1903193-001 | ND |
| 2019-07-24 | 35485209001 | ND |
| 2019-07-24 | 35485209001 | ND |
| 2019-07-24 | B1903193-001 | ND |
| 2020-06-23 | B2003030-001 | ND |
| 2020-06-23 | B2003030-002 | ND |
| 2021-03-29 | B2101469-003 | ND |
| 2021-03-29 | B2101469-002 | ND |
| 2021-03-29 | B2101469-001 | ND |
| 2021-06-14 | B2102705-002 | ND |
| 2021-06-14 | B2102705-005 | ND |
| 2021-06-14 | B2102705-004 | ND |
| 2021-06-14 | B2102705-003 | ND |
| 2021-06-14 | B2102705-001 | ND |
| 2021-06-28 | B2103005-006 | ND |
| 2021-06-28 | B2103005-005 | ND |
| 2021-06-28 | B2103005-004 | ND |
| 2021-06-28 | B2103003-003 | ND |
| 2021-06-28 | B2103003-002 | ND |
| 2021-06-28 | B2103003-001 | ND |
| 2022-08-22 | B2203975-001 | ND |
| 2023-05-08 | B2301971-001 | ND |
| 2023-05-08 | B2301971-002 | ND |
| 2023-05-08 | B2301971-003 | ND |
| 2023-05-08 | B2301971-004 | ND |
| 2023-05-08 | B2301971-005 | ND |