Chromium Testing

City of Evanston's Quarterly Chromium Test Results

City of Evanston's Water Chromium Test Results in Parts Per Billion (ppb)
Tap Water Total Chromium* Chromium VI (hexavalent)
1/26/2011 0.20 ppb 0.27 ppb
4/26/2011 0.30 ppb 0.22 ppb
7/26/2011 0.30 ppb 0.23 ppb
10/31/2011 0.20 ppb 0.18 ppb
1/31/2012 0.3 ppb 0.23 ppb

 

Untreated Lake Michigan Water Total Chromium* Chromium VI (hexavalent)
 1/26/2011  NA  NA
 4/26/2011  1.3 ppb  0.23 ppb
 7/26/2011  0.4 ppb  0.25 ppb
10/31/2011  0.50 ppb  0.23 ppb
1/31/20/12  0.3 ppb  0.31 ppb

*Total Chromium is comprised of hexavalent (Chromium VI) & trivalent (Chromium III). The EPA Maximum Contaminant Level (MCL) for Total Chromium is 100 ppb. The EPA has not established a MCL for Hexavalent Chromium.