Chromium (total)
Utilities Inc. - North Park Water Supply
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 | 12 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 4.20 ppb | 5 | 1 | ND - 21.0 ppb |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2019-02-26 | B1900784-001 | ND |
| 2019-02-26 | B1900784-005 | ND |
| 2019-02-26 | B1900784-004 | ND |
| 2019-02-26 | B1900784-003 | ND |
| 2019-02-26 | B1900784-002 | ND |
| 2019-02-26 | B1900784-001 | ND |
| 2019-02-26 | B1900784-005 | ND |
| 2019-02-26 | B1900784-004 | ND |
| 2019-02-26 | B1900784-003 | ND |
| 2019-02-26 | B1900784-002 | ND |
| 2019-10-15 | B1904643-001 | ND |
| 2019-10-15 | B1904643-001 | ND |
| 2022-03-07 | B2201045-001 | ND |
| 2022-03-07 | B2201045-002 | ND |
| 2022-03-07 | B2201045-003 | ND |
| 2022-03-07 | B2201045-004 | ND |
| 2022-03-07 | B2201045-005 | 21.0 ppb |
| 2023-07-17 | 35814599001 | ND |
| 2023-07-17 | 35814599003 | ND |