EWG's Tap Water Database — 2021 UPDATE


Chromium (hexavalent)

City of Scottsdale

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20143.47 ppb42420.0410 ppb - 36.0 ppb
20155.00 ppb224.80 ppb - 5.20 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-10201402100089AM1.20 ppb
2014-02-10201402100091AM0.340 ppb
2014-02-10201402100085AM4.60 ppb
2014-02-10201402100087AM36.0 ppb
2014-02-11201402120493AM4.50 ppb
2014-02-12201402130279AM0.300 ppb
2014-02-12201402130285AM4.20 ppb
2014-02-12201402120499AM14.0 ppb
2014-02-12201402130281AM1.000 ppb
2014-02-12201402130293AM0.260 ppb
2014-02-12201402130287AM1.10 ppb
2014-02-12201402130289AM0.260 ppb
2014-02-12201402130291AM1.000 ppb
2014-02-12201402130295AM1.40 ppb
2014-02-13201402130339AM0.410 ppb
2014-02-13201402130341AM0.540 ppb
2014-05-14201405140663AM0.0410 ppb
2014-05-14201405140675AM2.40 ppb
2014-05-14201405140673AM0.600 ppb
2014-05-14201405140665AM0.0410 ppb
2014-08-05201408050563AM5.00 ppb
2014-08-05201408050565AM0.740 ppb
2014-08-05201408050592AM0.170 ppb
2014-08-07201408070363AM6.00 ppb
2014-08-07201408070361AM1.10 ppb
2014-08-13201408130321AM1.10 ppb
2014-08-13201408130315AM0.160 ppb
2014-08-13201408130345AM4.40 ppb
2014-08-13201408130319AM1.000 ppb
2014-08-13201408130325AM1.30 ppb
2014-08-13201408130323AM1.000 ppb
2014-08-13201408130351AM0.160 ppb
2014-08-13201408130313AM4.70 ppb
2014-08-13201408130317AM0.160 ppb
2014-08-14201408140538AM36.0 ppb
2014-08-21201408220384AM0.230 ppb
2014-08-26201408260309AM0.780 ppb
2014-08-27201408270707AM2.60 ppb
2014-11-10201411100073AM2.20 ppb
2014-11-10201411100071AM2.30 ppb
2014-11-10201411100061AM0.200 ppb
2014-11-10201411100059AM0.180 ppb
2015-03-05201503050034AM4.80 ppb
2015-03-05201503050032AM5.20 ppb