Chromium (total)
Gowc East 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 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 3 | 0 | ND |
| 2023 | 2.01 ppb | 17 | 5 | ND - 11.0 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 |
|---|---|---|
| 2022-10-24 | B2205111-002 | ND |
| 2022-10-24 | B2205111-003 | ND |
| 2022-10-24 | B2205111-001 | ND |
| 2023-01-23 | B2300294-003 | 6.10 ppb |
| 2023-01-23 | B2300294-002 | 5.10 ppb |
| 2023-01-23 | B2300294-001 | ND |
| 2023-03-24 | B2301445-001 | 5.70 ppb |
| 2023-03-24 | B2301445-002 | ND |
| 2023-04-04 | B2301549-001 | ND |
| 2023-04-04 | B2301549-002 | ND |
| 2023-04-04 | B2301549-003 | 6.20 ppb |
| 2023-05-08 | B2301928-001 | ND |
| 2023-05-08 | B2301928-002 | ND |
| 2023-07-10 | B2302777-002 | ND |
| 2023-07-10 | B2302777-003 | 11.0 ppb |
| 2023-07-10 | B2302777-004 | ND |
| 2023-07-10 | B2302777-005 | ND |
| 2023-07-10 | B2302777-001 | ND |
| 2023-10-16 | B2304490-003 | ND |
| 2023-10-16 | B2304490-001 | ND |