Chromium Testing

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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)

01/26/2011

0.20 ppb

0.27 ppb

04/26/2011

0.30 ppb

0.22 ppb

07/26/2011

0.30 ppb

0.23 ppb

10/31/2011

0.20 ppb

0.18 ppb

01/31/2012

0.3 ppb

0.23 ppb

04/30/2012

0.4 ppb

0.24 ppb

07/30/2012

0.6 ppb

0.21 ppb

10/29/2012

0.2 ppb

0.23 ppb

08/15/2013

<0.2 ppb

0.18 ppb

11/14/2013

0.2 ppb

0.21 ppb

02/12/2014

0.3 ppb

0.24 ppb

05/07/2014

0.2 ppb

0.22 ppb

10/08/2014

<0.9 ppb

NA

10/21/2015

0.9 ppb

NA

11/10/2015

<0.9 ppb

NA

10/11/2016

<0.9 ppb

NA

04/19/2017

NA 0.18 ppb
 10/04/2017 <0.9 ppb  NA
 10/2018  <0.9 ppb  0.15 ppb

 

Untreated Lake Michigan Water

Total Chromium*

Chromium VI (hexavalent)

01/26/2011

NA

NA

04/26/2011

1.3 ppb

0.23 ppb

07/26/2011

0.4 ppb

0.25 ppb

10/31/2011

0.5 ppb

0.23 ppb

01/31/20/12

0.3 ppb

0.31 ppb

04/30/2012

0.5 ppb

0.31 ppb

07/30/2012

0.7 ppb

0.24 ppb

10/29/2012

0.6 ppb

0.43 ppb

04/19/2017

NA 0.29 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.