- Annual Drinking Water Quality report (municipal): A report in PDF format is published online by municipalities for each settlement area with a municipal water system. The report provides detailed data on water quality and may also include information about water takings and capacity.
- Annual Flow Summary Reports and Financial Plans for Municipal Drinking Water Systems (municipal): Flow summaries contain valuable data on committed and available water capacity, and financial plans may indicate proposals for expanding capacity. These documents may be posted online or may be made available only upon request.
- Oak Ridges Moraine Groundwater Program (municipalities and conservation authorities): A partnership of four GTHA municipalities and nine conservation authorities called the Oak Ridges Moraine Groundwater Program has created an extensive online database on geology and water resources in the central and eastern part of the GGH. The program draws on provincial databases on wells and Permits To Take Water, and updates the information. This information is not currently accessible to researchers who are not part of the partnership.
- Master servicing plans and environmental assessments (municipal): These studies by municipalities provide insight into current servicing levels and plans for future servicing and can help identify areas in which servicing is constrained as well as municipal proposals for new infrastructure.
- Land budgets (municipal): An important part of this project is to bring together information on water resources and water infrastructure with information on growth planned for the GGH. The most detailed source of information would be the individual municipal land budgets, which allocate population to specific locations in proposed greenfield developments. Between 2006 and 2016, all municipalities prepared these budgets, but the methods used differ from one municipality to another. The 2017 Growth Plan requires a standardized method.
 Although only settlements with a population of 10,000 or more are required to publish the reports online, in practice, most smaller communities do so as well.