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Chromium Testing
City of Evanston's Chromium Test Results
City of Evanston's Water Chromium Test Results in Parts Per Billion (ppb)
| Tap Water Date | Total Chromium* | Chromium VI |
|---|---|---|
| 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 |
| 01/31/2012 | 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.
