Bradford West Gwillimbury published its own hydrogeological terms of reference in July 2025, built on York Region's model but written for a town that drains mostly to Lake Simcoe. A hydrogeological study in Bradford West Gwillimbury therefore covers phosphorus and the Lake Simcoe Protection Plan as well as groundwater, and farm projects often add a Permit to Take Water for irrigation.
What this means for your project in Bradford West Gwillimbury
- The Town asks for a hydrogeological report with draft plans of subdivision, detailed subdivision engineering and site plans, and sometimes with other applications.
- Town engineering staff review it, and Lake Simcoe Region or Nottawasaga Valley Conservation Authority comments depending on where the property drains.
- Because most of the town drains to Lake Simcoe, the report may need to address phosphorus and keep rainwater soaking into the ground after development.
- The local factor most likely to affect scope and cost: the Lake Simcoe water balance. If a development cannot infiltrate as much water as the land did before, LSRCA can require offsetting fees.
Bradford West Gwillimbury groundwater data
Calculated from public provincial datasets for Town of Bradford West Gwillimbury. Each value names its source; links are under Sources at the end of the page.
| Median depth of wells with a water level | 23.2 m (1,803 records reporting depth and water level) |
|---|---|
| Median static water level | 6.7 m below ground (1,803 records reporting depth and water level) |
| Records reaching bedrock | 4.7% of all records with a depth |
| Well records | 3,171 records (all types) |
| Active Permits to Take Water | 31 permits; largest purpose categories: Farm uses 24 (22 + 2), Industrial 2, Accommodation and food services 1 |
| Active construction and dewatering permits | 1 of 31 active Permits to Take Water |
| Conservation authority | Lake Simcoe Region Conservation Authority (68.4% of area); Nottawasaga Valley Conservation Authority (31.6% of area) |
| Provincial plan areas | Greenbelt 18.6% 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.
Farming is the largest use of water permits here: 24 of the 31 active Permits to Take Water are agricultural, and 33 of the 50 permitted sources take surface water. Below ground, wells are drilled into deep glacial deposits, with a median depth of wells with a water level of 23.2 m, a median static level of 6.7 m below ground and only 4.7% of records with a depth reaching bedrock.
The Town's July 2025 terms of reference
The Bradford West Gwillimbury hydrogeological report terms of reference follow York Region's structure, which our page on Vaughan and York Region describes, with local changes that matter for scope:
| Item | What the Town's version says |
|---|---|
| Governing legislation | Adds the Lake Simcoe Protection Plan and the ministry's D-5-5 water supply guideline to the Ontario Water Resources Act, EASR, Permit to Take Water and Clean Water Act rules |
| When required | Draft plan of subdivision, detailed subdivision engineering, site plan control, and other processes the Town identifies |
| Impacts | Adds phosphorus loading, where required, to groundwater levels, wells, recharge, settlement and source water protection |
| Mitigation | Adds phosphorus loading mitigation; keeps the York measures such as contingency plans, settlement monitoring and engineering to reduce dewatering |
| Source protection | South Georgian Bay Lake Simcoe Source Protection Plan (January 2015, amended May 2024), as it applies to the town |
| Submission | Through an FTP site, following the Town's digital file naming convention |
The core content is otherwise familiar: a review area covering the largest possible zone of influence, monitoring wells, single-well response or pumping tests for formations that dewatering will affect, private well surveys where needed, seasonal groundwater levels, and a pre- and post-development water balance. Where dewatering could cause settlement, the applicant provides a pre-construction survey with photos and a CCTV inspection of the municipal infrastructure at risk, and where mitigation is recommended, a follow-up report confirming conditions have recovered.
Lake Simcoe and the water balance
About 68.4% of the town is in Lake Simcoe Region Conservation Authority's area. There, the Lake Simcoe Protection Plan requires a pre- and post-development water balance for major development, a hydrogeological assessment in significant groundwater recharge areas, and LSRCA's Water Balance Recharge Offsetting Policy applies where a site cannot keep its pre-development infiltration: off-site compensation or a fee per cubic metre of annual deficit. Our East Gwillimbury page explains the policy and the fee. The rest of the town drains to the Nottawasaga River system and is reviewed by Nottawasaga Valley Conservation Authority.
Infiltration is also where phosphorus enters the picture. Low impact development features that put stormwater into the ground help the water balance, but the Town's terms of reference ask the report to consider phosphorus loading and its mitigation, so infiltration design and groundwater quality need to be assessed together.
Fill and regrading
The Town's Fill and Site Alteration By-law 2017-33 requires a permit to place fill, remove topsoil or change the grade of land, after a review of the quantities, the quality of the material and the effect on neighbouring properties. Landscaping that raises grades by 200 mm or less without changing drainage is not the target. Larger projects submit an application with drawings, plans and reports, and the Town encourages pre-consultation with its Engineering Division first.
Two stages for a subdivision
The terms of reference name both draft plan of subdivision and detailed subdivision engineering, so a subdivision usually meets the hydrogeological requirements twice. At draft plan, the report establishes feasibility: groundwater levels, the water balance and whether the layout can meet Lake Simcoe targets. At detailed engineering, it supports the final design: dewatering estimates for servicing, infiltration feature sizing and the monitoring and contingency plans. Placing the monitoring wells at the first stage so it can serve the second avoids drilling twice, and if the plan changes in between, the Town expects an updated report or a letter from the author on whether the conclusions still hold.
Hydrogeological study cost in Bradford West Gwillimbury
| Study | Starting point | Full span |
|---|---|---|
| Groundwater study for a subdivision or site plan | $12,000 – $18,000 | $12,000 – $150,000 |
| Water balance study | $3,000 – $5,000 | $3,000 – $14,000 |
| Infiltration tests for LID design | $2,500 – $4,000 | $2,500 – $14,500 |
| Pumping test for a water supply | $7,000 – $11,000 | $7,000 – $86,500 |
| Construction dewatering hydrogeology | $9,000 – $14,000 | $9,000 – $62,500 |
These are indicative ranges based on typical scopes, the same province-wide ranges the estimator uses, not prices specific to Bradford West Gwillimbury. Locally, the work is reviewed by the Town of Bradford West Gwillimbury and Lake Simcoe Region or Nottawasaga Valley Conservation and, for water takings, the ministry, and the scope they ask for is what moves a quote. Lake Simcoe water balance and phosphorus requirements, and any site alteration permit, add to the groundwater work. Excludes well drilling, government application fees and HST. The Ontario cost guide breaks each range down.
Projects that need a hydrogeological study in Bradford West Gwillimbury
- Subdivisions. A hydrogeological report at draft plan and again at detailed engineering, with LSRCA water balance and, where needed, construction dewatering.
- Site plans. The terms of reference apply to site plan control, and buildings of 500 m² or more meet the Lake Simcoe Protection Plan's major development threshold.
- Farm water supplies. Pumping tests and Permits to Take Water for irrigation and other agricultural takings above 50,000 L/day.
Working with a hydrogeologist in Bradford West Gwillimbury
Bradford West Gwillimbury's July 2025 terms of reference follow York Region's model, so the scope will look familiar to consultants who work in York, but the Town also regulates fill and grading under its Site Alteration By-law, which needs its own permit with drawings, plans and reports. If both apply, ask for one field program that serves the hydrogeological assessment in Bradford West Gwillimbury and the site alteration permit. Lake Simcoe Region and Nottawasaga Valley share the town, and LSRCA reviews water balance and phosphorus where its policies apply. A P.Geo. named on a Bradford West Gwillimbury proposal can be looked up in PGO's register of members.
Bradford West Gwillimbury questions
When does Bradford West Gwillimbury ask for a hydrogeological report?
The Town's terms of reference (July 2025) list draft plans of subdivision, detailed subdivision engineering and site plan control, plus other processes the Town identifies. The scope is normally confirmed at pre-consultation.
Why does a hydrogeological report here mention phosphorus?
Because the town drains mostly to Lake Simcoe. The Town's terms of reference add phosphorus loading to the impacts the report may need to assess, and phosphorus loading mitigation to the measures it may need to propose, alongside the Lake Simcoe Protection Plan in the list of governing legislation. Infiltration features and septic systems both move water, and what it carries, toward the lake.
Is the Town's terms of reference the same as York Region's?
Not exactly: the Town's terms of reference are based on York Region's. The Town says its terms of reference were developed from the York Region version, which our Vaughan page explains. The Bradford version adds the Lake Simcoe Protection Plan and the D-5-5 well guideline to the governing legislation, adds phosphorus, and names the South Georgian Bay Lake Simcoe Source Protection Plan (January 2015, amended May 2024).
Do I need a permit to regrade or bring fill to my property?
Usually: the Town's Fill and Site Alteration By-law 2017-33 regulates placing fill, removing topsoil and changing grades. Small landscaping work is not the target, as long as the grade rises no more than 200 mm and drainage does not change; anything larger needs a site alteration permit with drawings, plans and reports.
Who pays if the Town wants a peer review?
The terms of reference say a peer review may be required and that its costs may be the applicant's responsibility. A report that is incomplete, written by an unqualified author or lacking adequate analysis can make the application incomplete and be returned.
Which conservation authority will look at the study?
Lake Simcoe Region Conservation Authority covers about 68.4% of the town in the provincial boundary data and Nottawasaga Valley Conservation Authority about 31.6%, so the watershed your property drains to decides which one comments.
Studies for Bradford West Gwillimbury sites
- Development Hydrogeological Study
Groundwater assessments that support subdivision, site plan and zoning applications.
- Water Balance Assessment
Pre- and post-development water budgets for planning approvals and low impact development design.
- Infiltration Testing (LID)
In-situ infiltration testing used to size low impact development stormwater features.
- Water Supply Well Assessment & Pumping Tests
Pumping tests, well yield and interference assessments for commercial, agricultural and communal supplies.
- Hydrogeological study cost guide
Ranges for every study type, side by side.
Near Bradford West Gwillimbury
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.
- Hydrogeological Report: Terms of Reference (July 2025) (opens in a new tab), Town of Bradford West Gwillimbury.
- Water Balance Recharge Offsetting Policy (May 1, 2023) (opens in a new tab), Lake Simcoe Region Conservation Authority.
- Site Alteration Permits (Fill and Site Alteration By-law 2017-33) (opens in a new tab), Town of Bradford West Gwillimbury.
- 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.
- Hydrogeology (planning application reviews) (opens in a new tab), Lake Simcoe Region Conservation Authority.