Know Your Environment. Protect Your Health.

Chromium (total)

California Water Service Company Oak Hills

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
201810.1 ppb64ND - 17.8 ppb
201910.5 ppb2210.00 ppb - 11.0 ppb
2020N/A00N/A
202116.0 ppb1116.0 ppb
202211.0 ppb2210.00 ppb - 12.0 ppb
2023N/A00N/A

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
2018-10-16CA2710019_003_003-20181016103017.8 ppb
2018-10-16CA2710019_010_010-20181016103311.5 ppb
2018-10-22CA2710019_003_003-20181022094915.9 ppb
2018-10-22CA2710019_010_010-201810220946ND
2018-10-29CA2710019_003_003-20181029114215.4 ppb
2018-10-29CA2710019_010_010-201810291139ND
2019-06-19CA2710019_008_008-20190619132810.00 ppb
2019-09-12CA2710019_003_003-20190912135911.0 ppb
2021-06-29CA2710019_001_001-20210629134516.0 ppb
2022-06-22CA2710019_008_008-20220622133612.0 ppb
2022-09-22CA2710019_003_003-20220922141510.00 ppb