Know Your Environment. Protect Your Health.

Chromium (total)

Tud - Tuolumne Water System

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
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
2023ND20ND

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
2018-08-22CA5510003_002_002-201808220810ND
2018-08-22CA5510003_003_003-201808220824ND
2019-08-13CA5510003_003_003-201908131135ND
2019-08-13CA5510003_002_002-201908131105ND
2020-08-13CA5510003_002_002-202008130940ND
2020-08-13CA5510003_003_003-202008130925ND
2021-08-23CA5510003_002_002-202108231405ND
2021-08-23CA5510003_003_003-202108231350ND
2022-08-10CA5510003_003_003-202208100745ND
2022-08-10CA5510003_002_002-202208100755ND
2023-08-03CA5510003_002_002-202308030855ND
2023-08-03CA5510003_003_003-202308030905ND