Chromium (total)
City of Sanger
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 | 2 | 0 | ND |
| 2019 | 1.58 ppb | 4 | 4 | 1.50 ppb - 1.60 ppb |
| 2020 | 4.15 ppb | 2 | 1 | ND - 8.30 ppb |
| 2021 | ND | 2 | 0 | ND |
| 2022 | 0.525 ppb | 4 | 1 | ND - 2.10 ppb |
| 2023 | 1.90 ppb | 2 | 2 | 1.60 ppb - 2.20 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 |
|---|---|---|
| 2019-01-09 | Q1901596015 | 1.60 ppb |
| 2019-01-09 | Q1901596016 | 1.60 ppb |
| 2019-01-09 | Q1901596017 | 1.60 ppb |
| 2019-01-09 | Q1901596018 | 1.50 ppb |
| 2020-10-06 | Q2039051015 | ND |
| 2020-10-06 | Q2039051016 | 8.30 ppb |
| 2022-02-08 | Q2204312002 | ND |
| 2022-11-29 | Q2235417007 | ND |
| 2022-11-29 | Q2235417008 | ND |
| 2022-12-13 | Q2237308003 | 2.10 ppb |
| 2023-11-15 | Q2349051018 | 2.20 ppb |
| 2023-11-15 | Q2349051019 | 1.60 ppb |