Know Your Environment. Protect Your Health.

Chromium (total)

Chalk Hill Special Utility District

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
20190.600 ppb21ND - 1.20 ppb
2020N/A00N/A
2021ND10ND
20220.750 ppb21ND - 1.50 ppb
2023N/A00N/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
2018-06-20Q1824487001ND
2019-01-10Q1901411001ND
2019-04-08Q19140000091.20 ppb
2021-11-09Q2131359006ND
2022-12-13Q2237298008ND
2022-12-13Q22372980091.50 ppb