Oro-Medonte's Official Plan describes the Oro Moraine as rolling upland that recharges groundwater to the headwaters of six watersheds, and much of its development relies on private wells and septic systems. A hydrogeological study in Oro-Medonte usually answers one of two questions: can this lot support a well and septic system, and will this development keep water soaking into the ground. This page also covers neighbouring Springwater, where many rural lots raise the same well and septic questions.
What this means for your project in Oro-Medonte
- Most studies here are for new homes and infill lots in hamlets without municipal services, rural severances, and commercial and resort-area development.
- The Township reviews them, sometimes with the County, and Nottawasaga Valley or Lake Simcoe Region Conservation Authority depending on the watershed.
- On an unserviced lot, the study has to show the soil can absorb septic effluent and the ground can supply enough water.
- The local factor most likely to affect scope and cost: whether the land is mapped as a significant recharge area, a highly vulnerable aquifer or a WHPA-Q2 area. Those mappings add water balance and mitigation work.
Oro-Medonte groundwater data
Calculated from public provincial datasets for Township of Oro-Medonte and Township of Springwater. Each value names its source; links are under Sources at the end of the page.
| Measure | Township of Oro-Medonte | Township of Springwater |
|---|---|---|
| Median depth of wells with a water level | 36.6 m (4,729 records reporting depth and water level) | 29 m (2,888 records reporting depth and water level) |
| Median static water level | 9.1 m below ground (4,729 records reporting depth and water level) | 10.7 m below ground (2,888 records reporting depth and water level) |
| Records reaching bedrock | 12.5% of all records with a depth | 2.3% of all records with a depth |
| Well records | 6,147 records (all types) | 4,037 records (all types) |
| Active Permits to Take Water | 36 permits; largest purpose categories: Water Supply 16, Commercial 10, Industrial 6 | 25 permits; largest purpose categories: Water Supply 9, Commercial 4, Farm uses 4 (3 + 1) |
| Active construction and dewatering permits | 0 of 36 active Permits to Take Water | 2 of 25 active Permits to Take Water |
| Conservation authority | Nottawasaga Valley Conservation Authority (71.2% of area); Lake Simcoe Region Conservation Authority (28.4% of area) | Nottawasaga Valley Conservation Authority (100% of area) |
| Provincial plan areas | None in the Oak Ridges Moraine, Greenbelt or Niagara Escarpment Plan areas | None in the Oak Ridges Moraine, Greenbelt or Niagara Escarpment Plan areas |
Source: Well Records (Water Well Information System), MECP (WWIS_2026a), retrieved 2026-10-14.
Source: Permit to Take Water, MECP (PermitsToTakeWater_26-01), retrieved 2026-10-14.
Source: Conservation Authority Administrative Area, Ontario GeoHub, retrieved 2026-10-14.
Source: Oak Ridges Moraine (ORM) Planning Area, Ontario GeoHub; Greenbelt Outer Boundary, Ontario GeoHub; Niagara Escarpment Plan Boundary, Ontario GeoHub; retrieved 2026-10-14.
Figures count records inside the municipal boundary that report a value; well locations and values are as submitted by well contractors, and MECP notes inaccuracies exist. How these figures are calculated.
Most Oro-Medonte wells are drilled into glacial deposits, not rock: just 12.5% of records with a depth reach bedrock. Among wells that report a water level, half go deeper than 36.6 m, and water typically stands 9.1 m below ground. Water supply permits are the largest group of the 36 active Permits to Take Water, followed by commercial and industrial takings. In Springwater, wells are shallower, with a median depth of 29 m for wells with a water level, and only 2.3% of records with a depth reach bedrock.
Lots without municipal services
The Oro-Medonte Official Plan (adopted 2022, in effect since December 2023) sets two local triggers for hydrogeological work in its Rural Settlements policies (section 2.4.3):
| Situation | What the plan requires |
|---|---|
| New dwelling on an existing vacant lot, or an expansion, without municipal water and/or sewer | May be required to provide a hydrogeological study assessing the assimilative capability of the soils |
| New infill lot by severance or plan of subdivision, unserviced or partially serviced | A hydrogeological study demonstrating the feasibility of private water supply and/or sewage disposal, assessing soil assimilative capability and confirming sufficient groundwater; road access; capacity confirmation where municipal water exists; and an agreement to pay for future connection |
In practice that means the provincial D-5-4 approach for septic effluent and nitrate at the property boundary, and the D-5-5 approach for well yield and water quality, scoped to the lot. The phrase "assimilative capability of the soils" is the Township's test: whether the ground can take the septic effluent without harming groundwater used by neighbours. Farther north, waterfront lots face the same well and septic questions with lake setbacks and phosphorus controls added; see the hydrogeological rules in Muskoka.
Recharge, vulnerable aquifers and WHPA-Q2
Section 3.2.4 of the plan brings source protection mapping into everyday planning decisions. Significant groundwater recharge areas and highly vulnerable aquifers are shown on Schedule F. In recharge areas, new development shall protect, improve or restore pre-development infiltration rates, with low impact development encouraged. In highly vulnerable aquifers, identified through the Intrinsic Susceptibility Index (below 30), the Township encourages mitigation.
The strictest rule applies in WHPA-Q2 areas with a moderate or significant risk level. There, new major development that may reduce aquifer recharge is permitted only where a hydrogeological study shows the existing water balance can be maintained with best management practices such as low impact development, and off-site recharge enhancement within the same WHPA-Q2 area may be needed to make up any predicted loss. Single detached homes, barns and non-commercial agricultural accessory buildings are excluded. The plan also confirms that planning decisions must conform to the significant threat policies of the source protection plan, in force since July 1, 2015.
Horseshoe Valley and the watersheds
For commercial lands in the Horseshoe Valley settlement area, the plan lists a hydrogeological evaluation, to the satisfaction of the Township and the County, among the studies needed for site plan approval. Across the township, Nottawasaga Valley Conservation Authority covers about 71.2% of the area and Lake Simcoe Region Conservation Authority about 28.4%. On the Lake Simcoe side, the Lake Simcoe Protection Plan water balance and LSRCA's recharge offsetting policy also apply to major development; our East Gwillimbury page explains them.
The Township's own plan reinforces this. Section 3.2.5 says development and site alteration in the Lake Simcoe watershed must demonstrate conformity with the Lake Simcoe Protection Plan and the County Official Plan, and section 4.3.2 requires a stormwater management report for major development there that is consistent with the settlement area's stormwater master plan and with subwatershed evaluations and water budgets, and that evaluates the expected change in water balance. The hydrogeological study supplies the groundwater levels, infiltration rates and water budget that report depends on.
Hydrogeological study cost in Oro-Medonte
| Study | Starting point | Full span |
|---|---|---|
| Severance study (D-5-4 / D-5-5) | $5,500 – $8,500 | $2,500 – $17,500 |
| Subdivision or site plan study | $12,000 – $18,000 | $12,000 – $150,000 |
| Site water balance assessment | $3,000 – $5,000 | $3,000 – $14,000 |
| Water supply well study | $7,000 – $11,000 | $7,000 – $86,500 |
| Hydrogeological study for a large septic system | $7,000 – $11,000 | $7,000 – $37,000 |
These are indicative ranges based on typical scopes, the same province-wide ranges the estimator uses, not prices specific to Oro-Medonte. Locally, the work is reviewed by the Township of Oro-Medonte or Springwater, the County of Simcoe and Nottawasaga Valley or Lake Simcoe Region Conservation and, for water takings, the ministry, and the scope they ask for is what moves a quote. On the Oro Moraine, recharge protection can add a water balance to a well and septic study. Excludes well drilling, government application fees and HST. Compare quotes using our hydrogeological study pricing guide.
Projects that need a hydrogeological study in Oro-Medonte
- Infill lots and new homes in unserviced hamlets. Soil assimilative capability and groundwater supply under the Rural Settlements policies.
- Rural severances. D-5-4 and D-5-5 work for private services.
- Commercial and resort-area development. Hydrogeological evaluation for site plan approval, and larger septic systems or water supplies where services are private.
- Major development in recharge or WHPA-Q2 areas. Water balance with low impact development, and off-site recharge where needed.
Springwater
Its own plan, one conservation authority
Springwater is a separate township with its own official plan, so its planning staff decide what an application needs. In the provincial boundary data Nottawasaga Valley Conservation Authority covers all of the township, which keeps the review simpler than in Oro-Medonte, where the watershed decides between two authorities.
Studies are set at pre-consultation
Springwater's Official Plan in force is its office consolidation; a new Official Plan 2051 was published in draft in August 2026 and does not yet apply. Section 29.20 of the Official Plan's implementation policies requires pre-consultation before an official plan, zoning, site plan or subdivision application, and staff can also require it for a consent. The studies scoped there can include a hydrogeological study and a wellhead protection area risk assessment report. The applicant pays for the studies and for any peer review the Township commissions, so budget for both.
Private services and new lots
Springwater's general development policies encourage new residential lots as infilling in settlement areas where suitable servicing is available and, on private services, where the soil can take septic effluent in the opinion of the agency with jurisdiction (section 3.10). Development in urban settlement areas depends on suitable sewage disposal and an adequate water supply of good quality (section 3.13). The Official Plan's consent policies add that a new lot must suit its use and match nearby lot sizes unless another agency requires a larger lot. NVCA's hydrogeological assessment guidelines scale the study to the risk: existing information can be enough where risk is low, and a site investigation with monitoring may be needed where it is high.
Wells mostly in overburden
Springwater's 4,037 well records describe a township built on overburden: most wells end in glacial deposits rather than rock, water stands a median 10.7 m below ground, and 25 active Permits to Take Water are registered in the township.
Working with a hydrogeologist in Oro-Medonte
Oro-Medonte's Official Plan lists a hydrogeological evaluation to the satisfaction of the Township and the County among the studies needed for site plan approval, so check with Township planning which studies your application needs before scoping. Send the consultant the lot layout, existing well records and any septic details; on the Oro Moraine, recharge protection can add a water balance to a hydrogeological assessment in Oro-Medonte. Nottawasaga Valley and Lake Simcoe Region share the township, so the watershed decides which conservation authority comments. Before booking the work, confirm the hydrogeologist's licence in the list of registered P.Geo. members.
For infill severances in Oro-Medonte or Springwater, hydrogeological studies for severances explains the well and septic testing.
Oro-Medonte and Springwater questions
Which conservation authority reviews a Springwater application?
Nottawasaga Valley Conservation Authority covers all of Springwater in the provincial boundary data and reviews applications there. Only 2.3% of Springwater well records with a depth reach bedrock.
I want to build a house on a vacant lot in a hamlet without municipal water. Do I need a study?
You may: under section 2.4.3 of the Oro-Medonte Official Plan, where Rural Settlements lands lack municipal water and/or sewer services, new dwellings on existing vacant lots and expansions to existing dwellings may be required to provide a hydrogeological study assessing the assimilative capability of the soils.
Can I sever an infill lot in a rural settlement on a well and septic system?
Yes, subject to conditions: the Official Plan requires frontage on an open, maintained public road, a hydrogeological study showing that the private water supply and sewage system are feasible, including the soils' assimilative capability and sufficient groundwater, confirmation of capacity where municipal water exists, and an agreement to pay for eventual connection if a municipal system is installed.
What is a highly vulnerable aquifer, and why does it matter here?
The Official Plan describes it as an aquifer easily affected by contamination because of thin or permeable overlying layers or preferential pathways, and notes that an Intrinsic Susceptibility Index below 30 identifies one. Highly vulnerable aquifers are mapped on Schedule F, and the Township encourages mitigation where development or site alteration is proposed in them.
Does development need to keep rainwater soaking into the ground?
In significant groundwater recharge areas, yes: the Official Plan says new development shall protect, improve or restore pre-development infiltration rates, and encourages low impact development. In WHPA-Q2 areas with a moderate or significant risk level, new major development that may reduce aquifer recharge needs a hydrogeological study showing the existing water balance can be maintained.
What does a commercial site plan in Horseshoe Valley need?
The Official Plan's policies for Horseshoe Valley commercial lands require site plan approval supported by technical studies under the Township's development engineering standards, including a hydrogeological evaluation to the satisfaction of the Township and the County.
Does this page cover Springwater?
For its data, yes: this page includes Springwater's well and permit figures, but Springwater is a separate township with its own official plan, so confirm its requirements with Springwater planning staff. In the provincial boundary data Nottawasaga Valley Conservation Authority covers all of Springwater, and wells there that report a water level have a median depth of 29 m.
Studies for Oro-Medonte properties
- Severance Hydrogeological Study (D-5-4 / D-5-5)
Groundwater quality and well supply assessments for rural lot creation under MECP guidelines D-5-4 and D-5-5.
- Water Balance Assessment
Pre- and post-development water budgets for planning approvals and low impact development design.
- Development Hydrogeological Study
Groundwater assessments that support subdivision, site plan and zoning applications.
- Hydrogeological Assessment for Large Septic Systems
Groundwater impact assessments for larger on-site sewage systems.
- Hydrogeological study cost guide
Ranges for every study type, side by side.
Near Oro-Medonte
Sources
- Well Records: Water Well Information System (WWIS_2026a) and county Well Record Data Reports (WW_Reports_2026a) (opens in a new tab), Government of Ontario (MECP), Ontario Data Catalogue.
- Permit to Take Water dataset (PermitsToTakeWater_26-01) (opens in a new tab), Government of Ontario (MECP), Ontario Data Catalogue.
- Conservation Authority Administrative Area (opens in a new tab), Ontario GeoHub.
- Oak Ridges Moraine (ORM) Planning Area (opens in a new tab), Ontario GeoHub.
- Greenbelt Outer Boundary (opens in a new tab), Ontario GeoHub.
- Niagara Escarpment Plan Boundary (opens in a new tab), Ontario GeoHub.
- Official Plan (adopted 2022, approved 2023; office consolidation May 2026) (opens in a new tab), Township of Oro-Medonte.
- Water Balance Recharge Offsetting Policy (May 1, 2023) (opens in a new tab), Lake Simcoe Region Conservation Authority.
- Springwater Official Plan, Section 29: Implementation (section 29.20, pre-consultation and studies) (opens in a new tab), Township of Springwater.
- Springwater Official Plan, Section 3: General Development Policies (sections 3.10 and 3.13) (opens in a new tab), Township of Springwater.
- Springwater Official Plan, Section 28: Consent Policies (section 28.2.2.10) (opens in a new tab), Township of Springwater.
- Hydrogeological Assessment Submissions: Conservation Authority Guidelines for Development Applications (June 2013) (opens in a new tab), Conservation Authorities Geoscience Group (no site of its own; copy published by Nottawasaga Valley Conservation Authority).
- Public Register (registered members) (opens in a new tab), Professional Geoscientists Ontario.
- Municipal Boundary - Lower and Single Tier (opens in a new tab), Ontario GeoHub.
- OHN Waterbody, 2M generalized layer (provincial hydrography dataset) (opens in a new tab), Ontario GeoHub.
- D-5-4 Individual on-site sewage systems: water quality impact risk assessment (opens in a new tab), Government of Ontario (MECP).
- D-5-5 Private wells: water supply assessment (opens in a new tab), Government of Ontario (MECP).