Cambridge's municipal wells pump from fractured bedrock, and some of that bedrock already carries a legacy of industrial solvents and road salt. A hydrogeological study in Cambridge often meets source water protection head-on, especially when old industrial land is redeveloped near a wellfield.
What this means for your project in Cambridge
- Most studies here support redevelopment and new buildings, especially on former industrial land, and businesses close to the Region of Waterloo's wellfields.
- The Region of Waterloo screens applications for source protection and can require a risk management plan; the City and Region issue sewer discharge approvals; Grand River Conservation Authority reviews natural features.
- If the site is in a wellhead protection area, a Section 59 notice goes in with the building permit or planning application.
- The local factor most likely to affect scope and cost: existing groundwater contamination near the wells. Solvents and salt are confirmed issues at some wellfields, so sampling and redevelopment protocols can expand the scope.
Cambridge groundwater data
Calculated from public provincial datasets for City of Cambridge. Each value names its source; links are under Sources at the end of the page.
| Median depth of wells with a water level | 29.3 m (1,268 records reporting depth and water level) |
|---|---|
| Median static water level | 9.4 m below ground (1,268 records reporting depth and water level) |
| Records reaching bedrock | 33.5% of all records with a depth |
| Well records | 5,301 records (all types) |
| Active Permits to Take Water | 28 permits; largest purpose categories: Water Supply 8, Public administration 4, Construction 3 |
| Active construction and dewatering permits | 4 of 28 active Permits to Take Water |
| Conservation authority | Grand River Conservation Authority (100% of area) |
| Provincial 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.
Water supply permits are the largest group of Cambridge's 28 active Permits to Take Water. In the city's well records, 33.5% of records with a depth reach bedrock, compared with 8.1% in Kitchener, and the median static water level is 9.4 m below ground. Grand River Conservation Authority covers the whole city.
Cambridge's wellfields
The Grand River source protection assessment report, chapter 8.5 (July 2025), describes the Cambridge wellfields that feed the Region's integrated urban system:
| Wellfield | Setting (from the assessment report) |
|---|---|
| Hespeler | Wells screened about 31 to 121 m deep in the Gasport Formation bedrock; part of the protection areas extends into Wellington County |
| Pinebush and Clemens Mill | Open-hole wells about 22 to 135 m deep in the Guelph, Eramosa, Goat Island and Gasport formations |
| Shades Mills | Wells G38 and G39 classed as groundwater under the direct influence of surface water, with effective filtration, because they are close to the Shades Mills Reservoir |
| Blair Road, Elgin Street, Middleton Street and Willard | Blair Road, Elgin Street and Middleton Street wells are open holes in the Guelph, Eramosa and Gasport formations; at Blair Road only a thin layer of outwash sits on the rock |
| Fountain Street | A separate wellfield with no drinking water issues identified |
Known contamination near the wells
The assessment report is specific about what is already in the ground. In the Pinebush wellfield it identifies 448 significant drinking water threats on 289 properties (information current to October 2020) and two significant conditions: former manufacturing sites with groundwater contamination, including 1,1,1-trichloroethane, 1,1-dichloroethylene and trichloroethylene, extending off-site. At Elgin Street, well G9 has three drinking water issues, chloride, sodium and trichloroethylene; TCE has been detected at about 2 µg/L against the 5 µg/L standard since 2001. The Region manages G9 through managed operation, road salt reduction, monitoring and its protocol for redevelopment of potentially contaminated sites.
For a redevelopment near these wells, that history shapes the hydrogeological work: baseline groundwater sampling for solvents as well as the usual parameters, care that dewatering does not draw an existing plume toward a supply well, and coordination with any environmental site assessment and Record of Site Condition.
Shades Mills and transport pathways
Shades Mills has no confirmed drinking water issue, but the assessment report lists three significant conditions in its WHPA-B: a former landfill with chloride contamination extending off-site, and two sites with chlorinated solvent contamination, including trichloroethylene, also extending off-site. The report also raised the vulnerability scores of parts of the Hespeler, Pinebush and Clemens Mill protection areas because clusters of wells, septic systems and underground services can act as transport pathways, shortcuts that let surface contamination reach the aquifer faster.
That has a direct consequence for hydrogeological field work. Every borehole, monitoring well and test well drilled near a wellfield is itself a potential pathway, so it should be sealed and, when no longer needed, decommissioned to the provincial well regulation. A study scope near these wells should say how that will be done.
Region of Waterloo rules in brief
Cambridge follows the Region of Waterloo's source water protection process: a Section 59 notice or notice of compliance from the TAPS mapping tool with every building permit or planning application in a vulnerable area, and a risk management plan where a significant threat activity continues. Parts of Cambridge are also in the Mannheim Service Area, where the Region is working through a water capacity constraint. Both are explained on our Kitchener page.
Checks to make before scoping a study
- Run the property through the Region's TAPS mapping tool to see whether it is in a vulnerable area and which policies apply.
- Look at the assessment report maps for the nearest wellfield, including the wellhead protection zone and any significant condition sites nearby.
- If the site was industrial, line up the environmental site assessment and the hydrogeological sampling so solvents are tested once, properly.
- Confirm whether the site is in the Mannheim Service Area before fixing a construction schedule.
Hydrogeological study cost in Cambridge
| Study | Starting point | Full span |
|---|---|---|
| Source water protection assessment | $4,500 – $7,000 | $4,500 – $15,500 |
| Groundwater study for a subdivision or site plan | $12,000 – $18,000 | $12,000 – $150,000 |
| Hydrogeology for construction dewatering | $9,000 – $14,000 | $9,000 – $62,500 |
| Monitoring and annual reporting (per year) | $4,000 – $6,500 | $4,000 – $61,000 |
These are indicative ranges based on typical scopes, the same province-wide ranges the estimator uses, not prices specific to Cambridge. Locally, the work is reviewed by the City of Cambridge, the Region of Waterloo and Grand River Conservation Authority and, for water takings, the ministry, and the scope they ask for is what moves a quote. On former industrial land, the solvent and salt issues already recorded in the bedrock add water quality work. Excludes well drilling, government application fees and HST. The Ontario cost guide breaks each range down.
Projects that need a hydrogeological study in Cambridge
- Redevelopment of former industrial land. Groundwater quality including solvents, source protection screening and dewatering design that protects nearby wells.
- Businesses in wellhead protection areas. Risk management plans for fuel, chemicals, solvents and salt storage.
- New buildings with basements. Dewatering estimates and sewer discharge approvals.
- Groundwater monitoring. Monitoring programs where a risk management plan or a redevelopment near the wells calls for them.
Working with a hydrogeologist in Cambridge
Cambridge sits in the Region of Waterloo's source protection system, so the first step is the Region's TAPS mapping tool, which generates the Notice of Source Protection Plan Compliance or Section 59 notice; some applications may be refused or first need a risk management plan. On former industrial land near a wellfield, send the consultant any environmental site assessments, because the solvent and salt issues already recorded in the bedrock affect what a hydrogeological assessment in Cambridge must test. Grand River Conservation Authority covers the whole city. You can confirm that the consultant is a registered geoscientist through the register kept by Professional Geoscientists Ontario.
Contractors pumping groundwater from a Cambridge excavation can use our EASR registration walkthrough for dewatering for the provincial steps.
Cambridge questions
Do Cambridge's municipal wells draw from rock or sand?
Mostly rock: the Grand River source protection assessment report describes the Hespeler, Pinebush, Clemens Mill, Blair Road, Elgin Street and Middleton Street wells as open holes or screens in the Guelph, Eramosa, Goat Island and Gasport bedrock formations, at depths from roughly 22 m to 135 m below ground.
Why does redevelopment of old industrial land near the wells get extra scrutiny?
Because past contamination is already in the groundwater. The assessment report records two "significant conditions" in the Pinebush wellfield, former manufacturing sites with chlorinated solvent contamination extending off-site, and lists trichloroethylene, chloride and sodium as drinking water issues at Elgin Street well G9. The Region manages G9 partly through its protocol for redevelopment of potentially contaminated sites.
How many properties near the Pinebush wells have significant drinking water threats?
The assessment report counts 448 significant drinking water threats on 289 properties in the Pinebush wellhead protection areas, based on information current to October 2020. That is why the Region's screening and Section 59 process matter for so many Cambridge applications.
What do I attach to a building permit in a Cambridge wellhead protection area?
A Cambridge building permit in a wellhead protection area needs a Notice of Source Protection Plan Compliance or Section 59 notice, generated through the Region of Waterloo's TAPS mapping tool. The Region's source water protection page explains that some applications may be refused or first need a risk management plan. Our Kitchener page walks through the process.
Is Cambridge affected by the Region's water capacity constraint?
Partly: the Region's Mannheim Service Area hub says the constrained area supplies Kitchener, Waterloo and parts of Cambridge, Woolwich and Wilmot. Check the hub's development FAQs to see whether your site is affected.
Do wellhead protection areas stop at the city boundary?
No: the assessment report notes that parts of the Hespeler, Pinebush and Clemens Mill wellhead protection areas extend into Wellington County, so properties outside Cambridge can fall under the same source protection policies.
Studies for Cambridge sites
- Source Water Protection Risk Assessment
Assessments for activities proposed inside wellhead protection areas and other vulnerable areas.
- Development Hydrogeological Study
Groundwater assessments that support subdivision, site plan and zoning applications.
- Construction Dewatering Assessment
Groundwater inflow estimates and dewatering rates for excavations, basements and servicing trenches.
- Groundwater Monitoring & Annual Reporting
Water level and water quality monitoring programs, baseline private well surveys and annual reports.
- Hydrogeological study cost guide
Ranges for every study type, side by side.
Near Cambridge
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.
- Assessment Report, Chapter 8.5: Cambridge Area Wellfields (July 29, 2025) (opens in a new tab), Grand River Source Protection Area (Lake Erie Source Protection Region).
- Source Water Protection (Section 59 notices, TAPS mapping tool, risk management plans) (opens in a new tab), Region of Waterloo.
- 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.
- Mannheim Service Area: Water Capacity Information Hub (opens in a new tab), Region of Waterloo.