Whitchurch-Stouffville has more of its land on the Oak Ridges Moraine than any other place we cover, and two of its communities drink groundwater from York Region wells. A hydrogeological study in Whitchurch-Stouffville is as likely to support a fill permit for a former gravel pit as a subdivision or a rural lot.
What this means for your project in Whitchurch-Stouffville
- Studies here support growth in Stouffville, rural lots on private wells and septic systems, and site alteration and fill projects, including the filling of former aggregate pits.
- The Town reviews applications and fill permits; York Region reviews dewatering discharge and activities near its wells; Lake Simcoe Region or Toronto and Region Conservation Authority reviews the watershed side.
- Bringing fill onto a property needs a Town permit beyond a small allowance, and large fill projects need a Council-approved agreement with groundwater monitoring.
- The local factor most likely to affect scope and cost: where the property sits on the moraine. Close to a wetland, stream or other key hydrologic feature, provincial rules add a hydrological evaluation; a bare rural lot usually needs far less.
Whitchurch-Stouffville groundwater data
Calculated from public provincial datasets for Town of Whitchurch-Stouffville. Each value names its source; links are under Sources at the end of the page.
| Median depth of wells with a water level | 31.1 m (4,550 records reporting depth and water level) |
|---|---|
| Median static water level | 12.8 m below ground (4,550 records reporting depth and water level) |
| Records reaching bedrock | 2.2% of all records with a depth |
| Well records | 7,433 records (all types) |
| Active Permits to Take Water | 20 permits; largest purpose categories: Commercial 8, Farm uses 3 (1 + 2), Industrial 3 |
| Active construction and dewatering permits | 0 of 20 active Permits to Take Water |
| Conservation authority | Lake Simcoe Region Conservation Authority (56.6% of area); Toronto and Region Conservation Authority (43.4% of area) |
| Provincial plan areas | Oak Ridges Moraine 78.8%; Greenbelt 97.7% of area |
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.
Wells here are drilled into thick glacial deposits rather than rock: just 2.2% of records with a depth reach bedrock. Half the records reporting both depth and water level are deeper than 31.1 m, and their median water level stands 12.8 m below ground. Most active Permits to Take Water draw groundwater, and commercial takings are the largest group.
Site alteration and fill permits
The Town's Site Alteration and Fill By-law 2024-037-RE requires a permit for any work that alters the existing grade: filling, dumping, extracting or moving soil, building a pond, berm or retaining wall, or re-routing a driveway. The Town's stated reasons are drainage, and protecting groundwater and the environment from contaminated material; it warns that once fill is delivered, clean-up of contaminated soil is the owner's cost.
| Situation | What the Town requires |
|---|---|
| Small amounts of clean fill | One-time allowance: 10 m³ (0.1 ha or less), 50 m³ (0.1 to 0.2 ha), 100 m³ (0.2 to 0.5 ha), 450 m³ (0.5 ha or more) |
| Any other grade change | A permit, with a site alteration and fill plan that can include groundwater monitoring, and background studies as required, including a hydrogeological assessment |
| 4,000 m³ or more | An agreement approved by Council, using the Town's large site alteration template |
| Fill quality | Provincial soil standards under O. Reg. 153/04; the default is the most stringent Table 1 background standard, with other generic or site-specific standards only where justified |
The by-law does not apply to areas regulated by a conservation authority, which issues its own permits, to work under a subdivision agreement, or to normal farm practices. The Town's site alteration guidelines also note that other agencies keep their own roles, including York Region for hydrogeology related to wellhead protection and aquifer vulnerability.
Filling former aggregate pits on the moraine
The guidelines describe a particular local situation. Former gravel and sand pits are usually in rural areas on the Oak Ridges Moraine, zoned for farming and rural residential use, and the Town accepts that filling them with excess soil from GTA construction can restore farmland and rebuild the overburden between the land surface and the water table. The same guidelines name the risk: unsuitable imported material affecting the land, groundwater and surface water. For a pit owner, the hydrogeological work can cover the depth to the water table under the pit floor, groundwater flow toward nearby wells and streams, the groundwater condition used to pick soil standards, and a monitoring program that runs through filling and closure.
Municipal wells in Stouffville and Ballantrae
According to the Town's 2025 Stouffville report, the community's water is a blend of groundwater from five York Region production wells at three sites and Lake Ontario water. York Region's 2025 report for Ballantrae and Musselman's Lake describes a groundwater-only system of three wells serving about 4,630 people, with sodium silicate added to hold naturally occurring iron and manganese in solution. Proposals for industrial, commercial, institutional or multi-unit uses near these wells may need a York Region source water protection permit before the Town can deem an application complete.
The moraine, watersheds and Regional approvals
- Oak Ridges Moraine. Under the provincial Oak Ridges Moraine Conservation Plan, development near a key hydrologic feature needs a hydrological evaluation and some major development a water budget. Our Caledon hydrogeology page explains both.
- Lake Simcoe watershed. Major development in the north of the town needs a water balance for LSRCA, which can charge for any recharge that is lost; our East Gwillimbury page explains how LSRCA recharge offsetting works.
- York Region. Shared hydrogeological terms of reference for York Region for development applications, and primary dewatering discharge approvals. See our Vaughan hydrogeology page.
Hydrogeological study cost in Whitchurch-Stouffville
| Study | Starting point | Full span |
|---|---|---|
| Planning application hydrogeological study | $12,000 – $18,000 | $12,000 – $150,000 |
| D-5-4 / D-5-5 severance study | $5,500 – $8,500 | $2,500 – $17,500 |
| Water balance report | $3,000 – $5,000 | $3,000 – $14,000 |
| Groundwater monitoring (per year) | $4,000 – $6,500 | $4,000 – $61,000 |
| Risk assessment near municipal wells | $4,500 – $7,000 | $4,500 – $15,500 |
These are indicative ranges based on typical scopes, the same province-wide ranges the estimator uses, not prices specific to Whitchurch-Stouffville. Locally, the work is reviewed by the Town of Whitchurch-Stouffville, York Region and Lake Simcoe Region or Toronto and Region Conservation and, for water takings, the ministry, and the scope they ask for is what moves a quote. Oak Ridges Moraine policies and groundwater monitoring for fill permits can add to a basic hydrogeological report. Excludes well drilling, government application fees and HST. Our Ontario hydrogeological study costs page has worked examples.
Projects that need a hydrogeological study in Whitchurch-Stouffville
- Stouffville subdivisions and site plans. York terms of reference, water balance, and dewatering approvals from the Region.
- Large fill and pit rehabilitation projects. Hydrogeological assessment and groundwater monitoring through filling and closure.
- Rural and estate lots. D-5-4 and D-5-5 work for private wells and septic systems, much of it on moraine land.
- Businesses near the municipal wells. Source water protection review of fuel, chemical and waste storage.
Working with a hydrogeologist in Whitchurch-Stouffville
For a fill or grading project in Whitchurch-Stouffville, the Town's site alteration application lists a hydrogeological assessment among the background studies that may be required, and its pre-screening questionnaire must be signed by a qualified professional such as a P.Eng. or P.Geo. Groundwater monitoring is part of the site alteration and fill plan, so budget for ongoing readings. With 78.8% of the town in the Oak Ridges Moraine planning area, send the consultant the site location so a hydrogeological assessment in Whitchurch-Stouffville checks moraine policies first. The qualified person signing the questionnaire can be confirmed on Ontario's register of practising geoscientists or, for a P.Eng., the Professional Engineers Ontario licence search.
For a rural lot split in the town, does a severance need a hydrogeological study covers the first questions.
Whitchurch-Stouffville questions
Do I need a permit to bring fill onto my property in Whitchurch-Stouffville?
Usually, yes: under the Town's site alteration by-law 2024-037-RE, any work that changes the existing grade needs a permit, including ponds, berms and retaining walls. There is a one-time allowance for clean fill: 10 m³ on properties of 0.1 ha or less, rising to 450 m³ on properties of 0.5 ha or more.
When does a site alteration need a hydrogeological assessment?
The Town's application form lists a hydrogeological assessment among the background studies that may be required, along with surface water, geotechnical and environmental impact assessments, and lists groundwater monitoring as part of the site alteration and fill plan. The application's pre-screening questionnaire has to be signed by a qualified professional, such as a P.Eng. or P.Geo.
What is different about filling a former gravel pit?
The Town's site alteration guidelines note that former aggregate pits are usually in rural areas within the Oak Ridges Moraine, and that filling them can restore the overburden between the land surface and the water table. The concern is imported material that could affect groundwater, so fill must meet provincial soil standards, by default the most stringent Table 1 background standards, and projects of 4,000 m³ or more need an agreement approved by Council.
Where does Stouffville's water come from?
A blend: the Town's 2025 Stouffville report describes a supply combining groundwater from five York Region production wells at three sites with surface water from Lake Ontario. Ballantrae and Musselman's Lake are supplied by three Regional wells.
Who approves construction dewatering discharge here?
York Region approves construction dewatering discharge in Whitchurch-Stouffville through its primary dewatering discharge approvals. The Region also supplies Ballantrae and Musselman's Lake from three Regional wells, and the application carries an application fee, a monthly monitoring fee and up to six weeks of review.
Is my property on the Oak Ridges Moraine?
Probably: 78.8% of the town is in the Oak Ridges Moraine planning area in the provincial boundary data, the highest share of any place we cover, and 97.7% is inside the Greenbelt outer boundary. The Town's zoning and official plan schedules, or the Province's mapping, will confirm it for a specific lot.
Studies for Whitchurch-Stouffville properties
- Development Hydrogeological Study
Groundwater assessments that support subdivision, site plan and zoning applications.
- Groundwater Monitoring & Annual Reporting
Water level and water quality monitoring programs, baseline private well surveys and annual reports.
- 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.
- Source Water Protection Risk Assessment
Assessments for activities proposed inside wellhead protection areas and other vulnerable areas.
- Hydrogeological study cost guide
Ranges for every study type, side by side.
Near Whitchurch-Stouffville
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.
- Site Alterations (By-law 2024-037-RE) and application form (opens in a new tab), Town of Whitchurch-Stouffville.
- Guidelines for Application of a Site Alteration and Fill Permit (2025) (opens in a new tab), Town of Whitchurch-Stouffville.
- Stouffville Drinking Water System 2025 annual report (opens in a new tab), Town of Whitchurch-Stouffville.
- 2025 Ballantrae/Musselman’s Lake drinking water system report (opens in a new tab), York Region.
- Source Water Protection Permit (Section 59 Notice) (opens in a new tab), York Region.
- O. Reg. 140/02: Oak Ridges Moraine Conservation Plan (opens in a new tab), Government of Ontario (e-Laws).
- Terms of Reference: Hydrogeological Report (Development Application Supporting Studies, June 2024) (opens in a new tab), York Region.
- Public Register (registered members) (opens in a new tab), Professional Geoscientists Ontario.
- Search for licence holders and engineering interns (opens in a new tab), Professional Engineers 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.
- Sewer Use Permits: Temporary Dewatering Discharge Program (Sewer Use Bylaw No. 2021-102) (opens in a new tab), York Region.