EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

City of Denison

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20131.37 ppb221.29 ppb - 1.45 ppb
20141.07 ppb119ND - 5.75 ppb
20150.895 ppb440.690 ppb - 1.20 ppb
20160.735 ppb220.720 ppb - 0.750 ppb
20170.950 ppb21ND - 1.90 ppb

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
2013-06-12Q13022050151.29 ppb
2013-06-12Q13022050141.45 ppb
2014-02-25Q14060590143.99 ppb
2014-02-25Q14060590135.75 ppb
2014-04-2435135556003AM0.250 ppb
2014-04-2435135556001AM0.300 ppb
2014-04-2435135556005AM0.230 ppb
2014-09-1035154727001AM0.310 ppb
2014-10-3035161880001AM0.400 ppb
2014-10-3035161880003AM0.240 ppb
2014-12-2235169075003AM0.310 ppb
2015-01-2935173367001AM0.710 ppb
2015-01-2935173367003AM0.690 ppb
2015-03-03Q15078940091.20 ppb
2015-06-15Q15220520040.980 ppb
2016-02-16Q16067680080.720 ppb
2016-02-16Q16067680070.750 ppb
2017-02-07Q17054660041.90 ppb