Chromium (total)
Horsham Water&sewer 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 | 5.73 ppb | 7 | 7 | 4.60 ppb - 7.40 ppb |
| 2019 | ND | 1 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.689 ppb | 10 | 5 | ND - 1.80 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 |
|---|---|---|
| 2018-02-28 | AF77331 | 5.80 ppb |
| 2018-02-28 | AF77333 | 4.60 ppb |
| 2018-02-28 | AF77335 | 4.80 ppb |
| 2018-02-28 | AF77334 | 6.40 ppb |
| 2018-02-28 | AF77336 | 5.40 ppb |
| 2018-06-22 | AF86999 | 5.70 ppb |
| 2018-12-27 | AG04620 | 7.40 ppb |
| 2019-03-06 | L7111824-1 | ND |
| 2021-07-08 | 25023178.00 | ND |
| 2021-07-08 | 25023187.00 | ND |
| 2021-07-08 | 25023168.00 | ND |
| 2021-07-15 | 25023218.00 | 1.40 ppb |
| 2021-07-21 | 25023197.00 | 1.20 ppb |
| 2021-07-21 | 25023228.00 | 0.990 ppb |
| 2021-07-29 | 25023207.00 | 1.50 ppb |
| 2021-07-29 | 24828811.00 | 1.80 ppb |
| 2021-09-29 | 25404421.00 | ND |
| 2021-09-29 | 25404431.00 | ND |