Credit Valley SPA Assessment Report

This report describes the physical features and water resources within the Credit Valley Source Protection Area jurisdiction. Using approved provincial methodologies, it delineates vulnerable areas and assesses specific activities that pose potential drinking water threats within these vulnerable areas.

Where drinking water threats have been identified as significant, the Source Protection Plan outlines what policies will apply.

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DOWNLOAD THE REPORT BY CHAPTER

Chapter 1 provides a brief overview of the provincial context for source water protection, previous work done on this issue, and the goals of the source water protection planning process.
Chapter 2 describes the physical and human characteristics of the Credit Valley Source Protection Area jurisdiction, including its physiography, geology, hydrology, terrestrial and aquatic ecology, human characterization, water quality, and water uses.
Chapter 3 summarizes the water budget and water quantity stress assessment.
Chapter 4 identifies the vulnerable areas required as part of the source protection program within the study area.
Chapter 5 describes how drinking water threats and issues were identified and lists threats within Credit Valley Source Protection Area’s jurisdiction.
Chapter 6 summarizes the Assessment Report contents and next steps.
Chapter 7 provides a list of references, which includes a number of technical reports prepared by consultants.

APPENDICES

Appendix A provides a description of the Data Sources.
Appendix B provides additional information for Chapter 2 on the Watershed Characterization data gaps and supplementary water quality data.
Appendix C documents the methodologies employed in the development of understanding the water supply and demand across the Credit Valley Source Protection Area.
Appendix D provides additional documentation of the Vulnerable Areas assessment process including the MOE Technical Bulletins on vulnerability.
Appendix E includes the MOE Technical Bulletin for the threat assessment process as well as output from the South Georgian Bay Lake Simcoe conformance exercise on the enumeration of threats, summaries of the municipal threat assessment reports prepared for municipalities and a summary of the work completed for the Lake Ontario Collaborative for the assessment of threats to Lake Ontario drinking water intakes.

SIGNIFICANT THREATS

With respect to surface water, three significant drinking water quality threat locations in Lake Ontario have been identified affecting intakes in Credit Valley Source Protection Area.

With respect to groundwater, 9,539 significant drinking water quality threats have been identified in this Assessment Report. Drinking water issues relating to sodium (Na) and chloride (Cl) were identified in WHPAs of municipal wells servicing the Towns of Orangeville while those related only to chloride were identified for municipal supply wells for the Town of Georgetown; issues relating to Nitrates (NO3) found in municipal wells servicing the Town of Acton. A drinking water issue relating to pathogens was also identified for a municipal well servicing Inglewood. These are areas in the middle and upper zones where sizeable populations receive municipal water supplies sourced from the ground.

The Tier 3 Water Budget work has also identified 392 significant drinking water quantity threats at Orangeville, Mono, Amaranth, and Acton.