Assessment Reports

Ensuring Safe Water

Safe and abundant municipal drinking water is critical to maintain a high quality of life. But how do we know how much is available, how safe it is, and what can threaten it? Assessment Reports look at an entire watershed – both above and below ground – and all interactions with drinking water sources in order to ensure both its quality and quantity.

Assessment Reports were the basis for our region’s Source Protection Plan, drafted by our Source Protection Committee (SPC), which protects drinking water quality and quantity in our watershed. Our region’s Assessment Reports were submitted to the Minister of Environment and Climate Change on July 3, 2014, and given the “green light” on January 26, 2015.

Amendments

• April 30, 2025: Recent amendments to the Clearview (Chapter 10) in the Nottawasaga Valley Assessment Report have been made under Section 51 of Ontario Regulation 287/07. These amendments reflect changes to the Colling-woodlands drinking water system.
• September 25, 2024: Recent amendments to the Oro-Medonte Chapter (Chapter 15) in the Nottawasaga Valley Assessment Report, and the Midland Chapter (Chapter 7) of the Severn Sound Assessment report, have been made under Section 51 of Ontario Regulation 287/07. These amendments reflect changes to the Craighurst, Oro-Medonte, and Midland drinking water systems.
• September 10, 2024: Recent amendments to the Shelburne Chapter (Chapter 6) in the Nottawasaga Valley Assessment Report have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect changes to the Shelburne drinking water system.
• July 23, 2024: Recent amendments to the Regional Municipality of Peel Chapter (Chapter 7) in the Nottawasaga Valley Assessment Report have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect changes to the Palgrave, Caledon drinking water system.
• May 1, 2024: Changes were made to the Adjala-Tosorontio chapter (Chapter 8) of the Nottawasaga Valley Assessment Report under Section 51 of Ontario Regulation 287/07 to reflect changes to the Weca (and formerly Loretto) drinking water system.
• April 4, 2024: Recent amendments to the Township of Oro-Medonte Chapters in the Lake Simcoe, Severn Sound, and Nottawasaga Valley Assessment Reports have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect changes to the Craighurst (Chapter 15, Nottawasaga Valley), and Horseshoe Highlands (Chapter 9, Severn Sound) drinking water systems, with a new well being added to both systems.
• December 22, 2023: Recent amendments to the Regional Municipality of Durham Chapter (Chapter 6)in the Lake Simcoe Assessment Report have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect the addition of new wells to the Cannington and Sunderland drinking water systems.
• December 8, 2023: Recent Amendments to the Township of Adjala-Tosorontio Chapter 8 in the Nottawasaga Valley Assessment Report have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect a change in the permitted pumping rates for the Colgan drinking water system and resulting updates to the wellhead protection areas.
• November 15, 2022: Recent amendments to the Township of Oro-Medonte, the Township of Springwater, and the Township of Clearview in the Lake Simcoe, Severn Sound, and Nottawasaga Valley Assessment Reports have been made under Section 34 of Ontario Regulation 287/07. These amendments reflect the addition of a well field and two new wells in Braestone (Chapter 9 Oro-Medonte, Severn Sound), the replacement of a well in Robincrest (Chapter 9 Oro-Medonte, Severn Sound), the addition of a new well in Maplewood (Chapter 11 Oro-Medonte, Lake Simcoe watershed), two new wells in Midhurst (Chapter 16 Springwater, Nottawasaga Valley), one new well in Stayner (Chapter 10 Clearview, Nottawasaga Valley), and a new well field with four new wells in Stayner (Chapter 10 Clearview, Nottawasaga Valley).
• November 16, 2021: Changes were made to the York Region chapter (Chapter 13) of the Lake Simcoe Assessment report under Section 51 of Ontario Regulation 287/07 to reflect changes to the Ballantrae drinking water system.
• June 16, 2021: Section 7.2 amended to summarize consultation undertaken for an amendment of the Regional Municipality of York Chapter (Chapter 13) of the Lake Simcoe Assessment Report. This amendment reflect updates to the Newmarket/Aurora drinking water system and it’s technical work.
• December 13, 2019: Minor typographic changes were made to the Source Protection Plan under Section 51 of Ontario Regulation 287/07 to fix errors in cross-referencing between policies.
• February 15, 2018: Changes were made to Shelburne Chapter 6 of the Nottawasaga Valley Assessment Report to account for the addition of a new well, the removal of a well which was decommissioned, and a revision to Wellhead Protection Area boundaries to address revised technical work.
• October 2, 2017: Recent amendments to the Town of Innisfil chapters in the Lake Simcoe and Nottawasaga Valley Assessment Reports have been made under Section 51(6) of Ontario Regulation 287/07. The amendments reflect the decommissioning of two wells comprising the Goldcrest drinking water system, previously included in the list of water supplies for the Town of Innisfil. Refer to Chapter 10 of the Lake Simcoe Assessment Report and Chapter 13 of the Nottawasaga Valley Assessment Report.
• August 4, 2015: Recent amendments to the City of Barrie chapters in the Lake Simcoe and Nottawasaga Valley Assessment Reports have been made under Section 51(6) of Ontario Regulation 287/07. Amendments reflect changes made to potential threat counts as a result of the SPC’s decision to demote septic systems from significant threat status in the City of Barrie Issues Contributing Area under Technical Rules 115 & 131. This decision only applies to septic systems located outside of areas where the vulnerability scoring is 10. Refer to Chapter 8 in the Lake Simcoe Assessment Report and Chapter 9 in the Nottawasaga Valley Assessment Report.