Updated Assessment Reports were approved for the Lower Thames Valley, St Clair Region and Upper Thames River Source Protection Areas on September 16, 2015. These documents are part of the Approved Source Protection Plan for the Thames-Sydenham and Region. The Assessment Reports document the science behind the Source Protection Plan, including identifying the vulnerable areas and drinking water threats.
Select a report section below to expand its contents. Interactive mapping is available from the Source Protection Plan page.
- Map 1-1 Thames-Sydenham & Region Source Protection Region
- Map 1-2 Lower Thames Valley Source Protection Area
- Map 1-3 Drinking Water Systems
- Map 1-4 Areas of Settlement
- Map 2-1 Population Density
- Map 3-1 Thames-Sydenham & Region Tier 1 Water Budget Subwatersheds
- Map 3-2 Average Precipitation Distribution
- Map 3-3 Average Evapotranspiration Distribution
- Map 3-4 Average Annual Infiltration
- Map 3-5 Surface Water Potential for Stress
- Map 3-6 Groundwater Potential for Stress
- Map 4-1 Vulnerability Overview – Intake Protection Zones and Wellhead Protection Areas
- Map 4-2 Chatham/South Kent Intake Protection Zone (IPZ)
- Map 4-3 Wheatley Intake Protection Zones (IPZ)
- Map 4-3b Wheatley IPZ-3 and Fuel Event Based Areas
- Map 4-4 West Elgin Intake Protection Zones (IPZ)
- Map 4-5 Highgate Wellhead Protection Area (WHPA)
- Map 4-6 Ridgetown Wellhead Protection Area (WHPA)
- Map 4-7 Highly Vulnerable Aquifers (HVA)
- Map 4-7a Aquifer Vulnerability
- Map 4-8 Significant Groundwater Recharge Areas (SGRA)
- Map 4-9 Significant Groundwater Recharge Areas (SGRA) Vulnerability
- Map 4-10 Stoney Point Event Based Areas
- Map 7-1a Impervious Surface Area within Wellhead Protection Areas and Intake Protection Zones
- Map 7-1b Impervious Surface Area within Highly Vulnerable Aquifers (HVA)
- Map 7-1c Impervious Surface Area within Significant Groundwater Recharge Areas (SGRA)
- Map 7-2a Wheatley, West Elgin and Chatham/South Kent Percent Managed Land
- Map 7-2b Ridgetown and Highgate Percent Managed Land
- Map 7-2c Percent Managed Land within Highly Vulnerable Aquifers (HVA)
- Map 7-2d Percent Managed Land within Significant Groundwater Recharge Areas (SGRA)
- Map 7-3a Wheatley, West Elgin and Chatham/South Kent Livestock Density
- Map 7-3b Ridgetown and Highgate Livestock Density
- Map 7-3c Livestock Density within Highly Vulnerable Aquifers (HVA)
- Map 7-3d Livestock Density within Significant Groundwater Recharge Areas (SGRA)
- Map 7-4 Chatham/South Kent Areas Where Activities Are or Would be Drinking Water Threats
- Map 7-5 Highgate Areas Where Activities Related to Pathogens, Chemicals or Dense Nonaqueous Phase Liquids (DNAPL) Are or Would be Drinking Water Threats
- Map 7-6 Ridgetown Areas Where Activities Related to Pathogens, Chemicals or Dense Nonaqueous Phase Liquids (DNAPL) Are or Would be Drinking Water Threats
- Map 7-7 West Elgin Areas Where Activities Are or Would be Drinking Water Threats
- Map 7-8 Wheatley Areas Where Activities Are or Would be Drinking Water Threats
- Map 7-9 Stoney Point Areas Where Activities Are or Would be Drinking Water Threats
- Map 1-1 Thames-Sydenham & Region Source Protection Region
- Map 1-2 St. Clair Region Source Protection Area
- Map 1-3 Drinking Water Systems
- Map 1-4 Areas of Settlement
- Map 2-1 Population Density
- Map 3-1 Thames-Sydenham & Region Tier 1 Water Budget Subwatersheds
- Map 3-2 Average Precipitation Distribution
- Map 3-3 Average Evapotranspiration Distribution
- Map 3-4 Average Annual Infiltration
- Map 3-5 Surface Water Potential for Stress
- Map 3-6 Groundwater Potential for Stress
- Map 4-1 Vulnerability Overview – Intake Protection Zones
- Map 4-1a Kettle and Stony Point Intake Protection Zones
- Map 4-2 Lambton Area Water Supply System Intake Protection Zone (IPZ)
- Map 4-2b Lambton Area Water Supply System Intake Protection Zone-3
- Map 4-3 Petrolia Intake Protection Zones (IPZ)
- Map 4-3b Petrolia Intake Protection Zone-3
- Map 4-4 Wallaceburg Intake Protection Zones (IPZ)
- Map 4-4b Wallaceburg Intake Fuel Event Based Area
- Map 4-4c Wallaceburg Intake Fertilizer Event Based Area
- Map 4-5 Highly Vulnerable Aquifers (HVA)
- Map 4-6 Aquifer Vulnerability
- Map 4-7 Significant Groundwater Recharge Areas (SGRA)
- Map 4-8 Significant Groundwater Recharge Areas (SGRA) Vulnerability
- Map 7-1a Impervious Surface Area within Intake Protection Zones
- Map 7-1b Impervious Surface Area within Highly Vulnerable Aquifers (HVA)
- Map 7-1c Impervious Surface Area within Significant Groundwater Recharge Areas (SGRA)
- Map 7-2 Petrolia, Lambton Area and Wallaceburg Percent Managed Lands
- Map 7-3 Petrolia, Lambton Area and Wallaceburg Livestock Density
- Map 7-4 Highly Vulnerable Aquifers (HVA) and Livestock Density
- Map 7-5 Significant Groundwater Recharge Areas (SGRA) and Livestock Density
- Map 7-6 Highly Vulnerable Aquifers (HVA) and Percent Managed Lands
- Map 7-7 Significant Groundwater Recharge Areas (SGRA) and Percent Managed Lands
- Map 7-8 Lambton Area Water Supply System Areas Where Activities Are or Would be Drinking Water Threats
- Map 7-9 Petrolia Areas Where Activities Are or Would be Drinking Water Threats
- Map 7-10 Wallaceburg Areas Where Activities Are or Would be Drinking Water Threats
- Map 1-1 Thames-Sydenham & Region Source Protection Region
- Map 1-2 Upper Thames River Source Protection Area
- Map 1-3 Municipal Drinking Water Systems
- Map 1-4 Areas of Settlement
- Map 2-1 Population Density
- Map 2-2 Federal Lands
- Map 3-1 Thames-Sydenham & Region Tier 1 Water Budget Subwatersheds
- Map 3-2 Average Precipitation Distribution
- Map 3-3 Average Evapotranspiration Distribution
- Map 3-4 Mean Annual Recharge
- Map 3-5 Surface Water Potential for Stress
- Map 3-6 Groundwater Potential for Stress
- Map 3-7 Local Area Water Quality Risk Level
- Map 4-1 Vulnerability Overview of Wellhead Protection Area
- Map 4-1-1 Birr Wellhead Protection Area
- Map 4-1-2 Dorchester Wellhead Protection Area (WHPA)
- Map 4-1-2a Dorchester Wellhead Protection Area (WHPA-E)
- Map 4-1-3 Kilworth-Komoka Wellhead Protection Area
- Map 4-1-4 London-Fanshawe Wellhead Protection Area (WHPA)
- Map 4-1-4a London-Fanshawe Wellhead Protection Area (WHPA-E)
- Map 4-1-5 London-Hyde Park Wellhead Protection Area
- Map 4-1-6 Melrose Wellhead Protection Area
- Map 4-1-7 Thorndale Wellhead Protection Area
- Map 4-1-8 Beachville Wellhead Protection Area
- Map 4-1-9 Embro Wellhead Protection Area
- Map 4-1-10 Hickson Wellhead Protection Area
- Map 4-1-11 Ingersoll Wellhead Protection Area
- Map 4-1-12 Innerkip Wellhead Protection Area
- Map 4-1-13 Lakeside Wellhead Protection Area
- Map 4-1-14 Mount Elgin Wellhead Protection Area
- Map 4-1-15 Tavistock Wellhead Protection Area
- Map 4-1-16 Thamesford Wellhead Protection Area (WHPA)
- Map 4-1-16a Thamesford Wellhead Protection Area (WHPA-E)
- Map 4-1-17 Woodstock Wellhead Protection Area (WHPA)
- Map 4-1-17a Woodstock Wellhead Protection Area (WHPA-E)
- Map 4-1-17b Woodstock Issue Contributing Area (ICA)
- Map 4-1-18 Mitchell Wellhead Protection Area
- Map 4-1-19 Sebringville Wellhead Protection Area
- Map 4-1-20 Shakespeare Wellhead Protection Area
- Map 4-1-21 St. Marys Wellhead Protection Area (WHPA)
- Map 4-1-21a St. Marys Wellhead Protection Area (WHPA-E)
- Map 4-1-22 St. Pauls Wellhead Protection Area
- Map 4-1-23 Stratford Wellhead Protection Area
- Map 4-2-1 Significant Groundwater Recharge Areas
- Map 4-2-2 Significant Groundwater Recharge Areas Vulnerability
- Map 4-3-1 Aquifer Vulnerability
- Map 4-3-2 Highly Vulnerable Aquifers
- Map 7-1-1 Birr Drinking Water Threats Impervious Surface Areas
- Map 7-1-2 Dorchester Drinking Water Threats Impervious Surface Areas
- Map 7-1-3 Kilworth-Komoka Drinking Water Threats Impervious Surface Areas
- Map 7-1-4 London-Fanshawe Drinking Water Threats Impervious Surface Areas
- Map 7-1-5 London-Hyde Park Drinking Water Threats Impervious Surface Areas
- Map 7-1-6 Melrose Drinking Water Threats Impervious Surface Areas
- Map 7-1-7 Thorndale Drinking Water Threats Impervious Surface Areas
- Map 7-1-8 Beachville Drinking Water Threats Impervious Surface Areas
- Map 7-1-9 Embro Drinking Water Threats Impervious Surface Areas
- Map 7-1-10 Hickson Drinking Water Threats Impervious Surface Areas
- Map 7-1-11 Ingersoll Drinking Water Threats Impervious Surface Areas
- Map 7-1-12 Innerkip Drinking Water Threats Impervious Surface Areas
- Map 7-1-13 Lakeside Drinking Water Threats Impervious Surface Areas
- Map 7-1-14 Mount Elgin Drinking Water Threats Impervious Surface Areas
- Map 7-1-15 Tavistock Drinking Water Threats Impervious Surface Areas
- Map 7-1-16 Thamesford Drinking Water Threats Impervious Surface Areas
- Map 7-1-17 Woodstock Drinking Water Threats Impervious Surface Areas
- Map 7-1-18 Mitchell Drinking Water Threats Impervious Surface Areas
- Map 7-1-19 Sebringville Drinking Water Threats Impervious Surface Areas
- Map 7-1-20 Shakespeare Drinking Water Threats Impervious Surface Areas
- Map 7-1-21 St. Marys Drinking Water Threats Impervious Surface Areas
- Map 7-1-22 St. Pauls Drinking Water Threats Impervious Surface Areas
- Map 7-1-23 Stratford Drinking Water Threats Impervious Surface Areas
- Map 7-1-24 Impervious Surface Area in Highly Vulnerable Aquifers (HVA)
- Map 7-1-25 Impervious Surface Area in Significant Groundwater Recharge Areas (SGRA)
- Map 7-2-1 Birr Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-2 Dorchester Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-3 Kilworth-Komoka Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-4 London-Fanshawe Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-5 London-Hyde Park Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-6 Melrose Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-7 Thorndale Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-8 Beachville Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-9 Embro Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-10 Hickson Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-11 Ingersoll Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-12 Innerkip Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-13 Lakeside Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-14 Mount Elgin Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-15 Tavistock Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-16 Thamesford Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-17 Woodstock Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-18 Mitchell Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-19 Sebringville Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-20 Shakespeare Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-21 St. Marys Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-22 St. Pauls Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-23 Stratford Drinking Water Threats Managed Lands and Livestock Density
- Map 7-2-24 Percent Managed Lands in Highly Vulnerable Aquifers (HVA)
- Map 7-2-25 Livestock Density in Highly Vulnerable Aquifers (HVA)
- Map 7-2-26 Percent Managed Lands in Significant Groundwater Recharge Areas (SGRA) with Vulnerability Score = 6
- Map 7-2-27 Livestock Density in Significant Groundwater Recharge Areas (SGRA) with Vulnerability Score = 6
- Map 7-3-1 Birr Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-2 Dorchester Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-2a Dorchester (WHPA-E) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-3 Kilworth-Komoka Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-4 London-Fanshawe Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-4a London-Fanshawe (WHPA-E) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-5 London-Hyde Park Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-6 Melrose Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-7 Thorndale Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-8 Beachville Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-9 Embro Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-10 Hickson Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-11 Ingersoll Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-12 Innerkip Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-13 Lakeside Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-14 Mount Elgin Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-15 Tavistock Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-16 Thamesford Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-16a Thamesford (WHPA-E) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-17 Woodstock Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-17a Woodstock (WHPA-E) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-17b Woodstock Issues Contributing Area (ICA) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-18 Mitchell Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-19 Sebringville Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-20 Shakespeare Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-21 St. Marys Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-21a St. Marys (WHPA-E) Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-22 St. Pauls Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
- Map 7-3-23 Stratford Areas Where Activities Related to Pathogens, Chemicals or DNAPL are or would be Drinking Water Threats
Source Protection Plan
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