Know Your Environment. Protect Your Health.

Chromium (total)

Cross Timbers Water Supply Corporation

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20190.240 ppb51ND - 1.20 ppb
20200.850 ppb21ND - 1.70 ppb
2021ND20ND
20221.12 ppb62ND - 5.40 ppb
20232.80 ppb112.80 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
2019-03-07Q1909909004ND
2019-03-07Q19099090091.20 ppb
2019-06-05Q1932306007ND
2019-06-05Q1932306008ND
2019-06-05Q1932306009ND
2022-02-17Q22059650021.30 ppb
2022-02-17Q22059650035.40 ppb
2022-09-22Q2228542004ND
2022-11-29Q2235312008ND
2022-11-29Q2235312009ND
2022-11-29Q2235312010ND
2023-03-02Q23084880132.80 ppb