Municipal Affairs and Environment

Site Specific Water Quality Index (SS-WQI)

Site specific water quality guidelines are required when there are high natural background levels of particular parameters in water bodies. The site specific WQI calculator was created by Water Resources Management Division to deal with such situations. The calculator uses a CCME approved derivation method called the Background Concentration Procedure. The SS-WQI has all the same functionality of the CWQI with the addition of a site specific guideline generation option.

Site Specific Water Quality Index 1.0 Calculator

The Site Specific WQI Calculator and Help File are available for download below.

The process of developing the Site Specific WQI Calculator is available in an article below.


The Canadian Water Quality index has been developed by the CCME and has been adopted by the Water Resources Management Division for the application in Newfoundland and Labrador. This has been programmed to run on Excel 2002 (SP-2) using Visual Basic for Applications. Service packs, such as SP-2 mentioned above, are free downloads from Microsoft which contain improvements for licensed products.

While every effort has been made to test the electronic spreadsheet, the Government of Newfoundland and Labrador makes no warranties expressed or implied, as to the performance of this spreadsheet. Users are expected to use professional judgement in the application of the spreadsheet.

Adobe® Acrobat® Reader software can be used for viewing PDF documents. Download Acrobat® Reader for free. opens new window

Last Updated:
This page and all contents are copyright, Government of Newfoundland and Labrador, all rights reserved.