Know Your Environment. Protect Your Health.

Chromium (total)

Navarro Mills 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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.60 ppb111.60 ppb
20191.50 ppb111.50 ppb
20203.60 ppb113.60 ppb
20213.70 ppb113.70 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
2018-01-31Q18037180031.60 ppb
2019-02-06Q19058060011.50 ppb
2020-01-29Q20035520033.60 ppb
2021-01-12Q21006750073.70 ppb
2022-04-14Q2211616001ND
2023-02-15Q2306296007ND