Chromium Testing

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City of Evanston's 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
10/2019	<0.9 ppb	0.16 ppb
11/03/2020	<0.9 ppb	0.15 ppb
09/02/2021	<0.9 ppb	0.17 ppb
12/06/2022	<0.9 ppb	0.13 ppb
10/04/2023	<0.9 ppb	0.14 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
11/03/2020	NA	0.19 ppb
09/02/2021	NA	NA
12/06/2022	NA	0.14 ppb
10/04/2023	NA	0.15 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.