Know Your Environment. Protect Your Health.

Chromium (total)

City of Nampa

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.33 ppb663.00 ppb - 7.00 ppb
20191.40 ppb52ND - 4.00 ppb
2020N/A00N/A
20213.67 ppb333.00 ppb - 4.00 ppb
2022ND50ND
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
2018-10-08I18500163.00 ppb
2018-10-08I18500267.00 ppb
2018-10-08I18500244.00 ppb
2018-10-08I18500234.00 ppb
2018-10-08I18500285.00 ppb
2018-10-08I18501093.00 ppb
2019-07-18I1935059ND
2019-07-18I19350583.00 ppb
2019-07-18I19350564.00 ppb
2019-07-18I1935089ND
2019-07-18I1935088ND
2021-03-08I21106114.00 ppb
2021-03-08I21106153.00 ppb
2021-11-09I21608714.00 ppb
2022-08-18I2240735ND
2022-10-21I2252720ND
2022-11-16I2256979ND
2022-11-16I2256980ND
2022-11-18I2256985ND
2023-08-15I2317348-01ND