Chromium (total)
Gowc North Water System
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 13 | 0 | ND |
| 2023 | 4.93 ppb | 12 | 8 | ND - 9.60 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 |
|---|---|---|
| 2020-12-02 | B2006458-001 | ND |
| 2021-02-01 | B2100475-001 | ND |
| 2021-05-03 | B2102123-001 | ND |
| 2021-05-03 | B2102123-002 | ND |
| 2022-02-09 | B2200572-002 | ND |
| 2022-02-09 | B2200572-001 | ND |
| 2022-02-15 | B2200664-002 | ND |
| 2022-02-15 | B2200664-001 | ND |
| 2022-04-04 | B2201638-001 | ND |
| 2022-04-04 | B2201638-002 | ND |
| 2022-09-27 | B2204850-001 | ND |
| 2022-10-24 | B2205110-002 | ND |
| 2022-10-24 | B2205110-001 | ND |
| 2022-11-22 | B2205635-004 | ND |
| 2022-11-22 | B2205635-003 | ND |
| 2022-11-22 | B2205635-002 | ND |
| 2022-11-22 | B2205635-001 | ND |
| 2023-01-23 | B2300295-006 | ND |
| 2023-01-23 | B2300295-005 | ND |
| 2023-01-23 | B2300295-004 | 6.40 ppb |
| 2023-01-23 | B2300295-003 | 6.70 ppb |
| 2023-01-23 | B2300295-001 | 6.50 ppb |
| 2023-01-27 | B2300529-001 | 7.70 ppb |
| 2023-02-22 | B2300746-001 | 7.70 ppb |
| 2023-04-03 | B2301548-002 | 5.30 ppb |
| 2023-04-03 | B2301548-001 | ND |
| 2023-07-10 | B2302776-004 | ND |
| 2023-07-10 | B2302776-002 | 9.30 ppb |
| 2023-07-10 | B2302776-001 | 9.60 ppb |