Know Your Environment. Protect Your Health.

Chromium (total)

South Grayson 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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
20196.27 ppb334.70 ppb - 8.00 ppb
202012.0 ppb1112.0 ppb
20215.20 ppb115.20 ppb
20220.767 ppb32ND - 1.20 ppb
20232.00 ppb112.00 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
2018-10-15Q1840862015ND
2019-08-13Q19542360014.70 ppb
2019-08-13Q19542360026.10 ppb
2019-08-13Q19542360208.00 ppb
2020-08-06Q203119401912.0 ppb
2021-11-10Q21316310055.20 ppb
2022-02-08Q22042510011.10 ppb
2022-04-26Q22124660011.20 ppb
2022-04-26Q2212466002ND
2023-05-16Q23184390172.00 ppb