Know Your Environment. Protect Your Health.

Chromium (total)

Twin Lakes Water Works Corporation

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20185.30 ppb115.30 ppb
2019N/A00N/A
20200.367 ppb31ND - 1.10 ppb
20210.825 ppb43ND - 1.20 ppb
20221.15 ppb221.10 ppb - 1.20 ppb
2023ND40ND

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
2018-02-22AU03751-INP5.30 ppb
2020-06-02AW10200-INP1.10 ppb
2020-06-02AW10202-INPND
2020-10-14AW19900-INPND
2021-05-21CI37078-INPND
2021-06-09AX11168-INP1.10 ppb
2021-06-09AX11166-INP1.000 ppb
2021-10-06AX20390-INP1.20 ppb
2022-06-07AY09590-INP1.10 ppb
2022-10-04AY17875-INP1.20 ppb
2023-03-20AZ04882-INPND
2023-05-10AZ08444-INP-1ND
2023-05-10AZ08442-INPND
2023-12-13AZ22568-INPND