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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

City of Mountain View

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.

MORE ABOUT THIS CONTAMINANT

 

33

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.310 ppb2911ND - 2.00 ppb
2015N/A00N/A
2016N/A00N/A
2017ND20ND
2018ND20ND
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-02-192978597ND
2014-02-1929785881.50 ppb
2014-02-1929786290.800 ppb
2014-02-1929786690.300 ppb
2014-02-192978607ND
2014-02-1929786590.200 ppb
2014-02-192978651ND
2014-02-192978673ND
2014-02-1929786431.50 ppb
2014-02-192978663ND
2014-04-231610-011-1100ND
2014-04-231610-016-1045ND
2014-04-231610-029-0915ND
2014-05-083025950ND
2014-05-083025959ND
2014-05-083025969ND
2014-05-083025973ND
2014-08-2130914680.200 ppb
2014-08-213091397ND
2014-08-213091406ND
2014-08-2130914212.00 ppb
2014-08-213091444ND
2014-08-2130914480.600 ppb
2014-08-2130914361.50 ppb
2014-08-213091498ND
2014-11-1931436030.200 ppb
2014-11-193143588ND
2014-11-1931435760.200 ppb
2014-11-193143618ND
2017-06-081610-016-1020ND
2017-06-081610-011-0950ND
2018-03-011610-029-0840ND
2018-12-069590-014-1200ND