Chromium (total)
North Penn Water Authority
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 | 13 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.0833 ppb | 12 | 1 | ND - 1.000 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-01-08 | 2288413002 | ND |
| 2018-01-08 | 2288413012 | ND |
| 2018-01-08 | 2288413011 | ND |
| 2018-01-08 | 2288413010 | ND |
| 2018-01-08 | 2288413009 | ND |
| 2018-01-08 | 2288413008 | ND |
| 2018-01-08 | 2288413007 | ND |
| 2018-01-08 | 2288413005 | ND |
| 2018-01-08 | 2288413004 | ND |
| 2018-01-08 | 2288413003 | ND |
| 2018-01-08 | 2288413001 | ND |
| 2018-01-08 | 2288413006 | ND |
| 2018-06-04 | 2318792001 | ND |
| 2021-01-20 | 23713115.00 | ND |
| 2021-01-20 | 23713170.00 | ND |
| 2021-01-20 | 23713148.00 | ND |
| 2021-01-20 | 23713126.00 | ND |
| 2021-01-20 | 23713192.00 | ND |
| 2021-01-20 | 23713137.00 | ND |
| 2021-01-20 | 23713181.00 | ND |
| 2021-01-20 | 23713203.00 | ND |
| 2021-01-20 | 23713159.00 | ND |
| 2021-05-05 | 24438626.00 | ND |
| 2021-08-02 | 25023345.00 | ND |
| 2021-10-19 | 25405315.00 | 1.000 ppb |