Know Your Environment. Protect Your Health.

Chromium (total)

North Wales 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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND100ND
2019ND10ND
2020ND10ND
20210.500 ppb84ND - 1.000 ppb
2022ND10ND
2023ND10ND

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
2018-02-068021845-01ND
2018-03-058032061-02ND
2018-03-058032061-03ND
2018-03-058032061-04ND
2018-03-058032061-05ND
2018-03-058032061-06ND
2018-03-058032061-07ND
2018-03-058032061-08ND
2018-03-058032061-09ND
2018-03-058032061-01ND
2019-02-059021904-01ND
2020-02-0421669190.00ND
2021-02-0423890621.00ND
2021-03-0124062455.00ND
2021-03-0124062456.00ND
2021-03-0124062460.001.000 ppb
2021-03-0124062457.001.000 ppb
2021-03-0124062458.001.000 ppb
2021-03-0124062459.001.000 ppb
2021-03-0124062454.00ND
2022-02-0126119361.00ND
2023-02-0728351349.00ND