Know Your Environment. Protect Your Health.

Chromium (total)

North Castle Water District #5

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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20186.40 ppb116.40 ppb
20191.000 ppb111.000 ppb
2020ND20ND
2021ND20ND
20220.600 ppb21ND - 1.20 ppb
2023ND30ND

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
2018-07-24AU15719-INP6.40 ppb
2019-08-05AV16475-INP1.000 ppb
2020-02-25AW03851-INPND
2020-07-21AW13838-INPND
2021-03-02AX04050-INPND
2021-07-06AX130091-INPND
2022-03-01AY03628-INP1.20 ppb
2022-07-20AY12577-INPND
2023-03-21AZ05019-INPND
2023-07-10AZ12339-INPND
2023-09-12AZ16819-INPND