Know Your Environment. Protect Your Health.

Chromium (total)

North Castle Water District #4

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20187.55 ppb227.30 ppb - 7.80 ppb
20192.30 ppb222.00 ppb - 2.60 ppb
20200.333 ppb62ND - 1.000 ppb
2021ND60ND
20220.417 ppb62ND - 1.40 ppb
2023ND60ND

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
2018-07-24AU15716-INP7.80 ppb
2018-07-24AU15718-INP7.30 ppb
2019-08-05AV16474-INP2.60 ppb
2019-08-05AV16471-INP2.00 ppb
2020-02-25AW03861-INPND
2020-02-25AW03855-INP1.000 ppb
2020-02-25AW03853-INP1.000 ppb
2020-07-13AW13180-INPND
2020-07-29AW14499-INPND
2020-08-27AW16635-INPND
2021-03-02AX04052-INPND
2021-03-03AX04226-INPND
2021-03-03AX04224-INPND
2021-07-06AX13097-INPND
2021-08-03AX15569-INPND
2021-08-03AX15556-INPND
2022-03-01AY03618-INP1.10 ppb
2022-03-01AY03622-INP1.40 ppb
2022-03-01AY03616-INPND
2022-07-19AY12490-INPND
2022-07-20AY12624-INPND
2022-07-21AY12753-INPND
2023-03-21AZ05017-INPND
2023-03-21AZ05015-INPND
2023-03-22AZ05102-INPND
2023-07-10AZ12341-INPND
2023-07-10AZ12342-INPND
2023-07-25AZ13469-INPND