Well Drilling FAQ — Renfrew County, Ontario

Most residential drilled wells in Renfrew County penetrate the Canadian Shield bedrock within 20–60 feet of surface but require drilling considerably deeper to reach productive water-bearing fractures. The typical range across the county is 100–250 feet, with many wells exceeding 300 feet in harder granite terrain around Barry's Bay, Combermere, and the Madawaska Highlands.

Regional averages (approximate):

• Pembroke / Petawawa corridor: 80–180 feet
• Renfrew / Arnprior / Cobden: 60–150 feet
• Eganville / Killaloe / Bonnechere Valley: 100–220 feet
• Barry's Bay / Madawaska Highlands: 120–300+ feet
• Deep River / Chalk River: 80–200 feet

These are typical ranges. Actual well depth is site-specific — two neighbouring properties may require very different depths to reach adequate yield.

Water in Renfrew County's Canadian Shield geology doesn't flow through porous sand layers the way it does in sedimentary regions. It travels through a network of fractures, joints, and faults in the bedrock. The distribution of these fractures is highly variable — sometimes productive fractures are encountered at 80 feet; sometimes a driller must go 350 feet before finding sufficient yield.

Factors that influence depth include local fault orientation, glacial history, elevation, and proximity to valleys. No surface investigation can reliably predict exact well depth — only drilling reveals what's below.

Ontario Regulation 903 does not prescribe a minimum yield, but practical and lender standards typically require at least 0.5–1.0 gallons per minute (GPM) sustained yield for a residential property. Some mortgage lenders require 1+ GPM.

Average household demand runs 50–100 gallons per day. A yield of 0.5 GPM continuously over 24 hours provides 720 gallons — sufficient for most households, especially when paired with a larger pressure tank or cistern. A yield under 0.25 GPM may require supplemental storage or, in rare cases, hydrofracturing to improve the well.

Total installation costs for a complete residential well system in Renfrew County typically range from $8,000 to $20,000. The main components:

• Drilling: $30–$55 per foot
• Steel casing (overburden section): $1,200–$3,000
• Submersible pump system: $1,800–$4,500
• Pressure tank + controls: $600–$1,800
• Water line to house: $1,500–$5,000

A well drilled to 150 feet in moderately accessible terrain typically costs $10,000–$14,000 all-in. Remote locations, hard rock, steep terrain, or long water lines push costs higher. See the full Cost Guide for a detailed breakdown.

Yes, in two respects:

• Provincial: Only a contractor licensed under Ontario Regulation 903 may drill a well. The licensing requirement applies to all of Renfrew County without exception.
• Municipal: Some townships in Renfrew County may require a building permit or local water-taking permit. Check with the specific municipal office (e.g., Township of Laurentian Valley, McNab/Braeside, Whitewater Region, Bonnechere Valley) before commencing work.

The licensed driller must file a provincial Well Record within 30 days of completing the well. As the property owner, always request a copy for your records and for future property transactions.

Ontario Regulation 903 sets the following minimum horizontal setback distances:

• 15 metres (50 ft) from a sewage system (tile field / leaching bed)
• 30 metres (100 ft) from a septic tank, cesspool, or holding tank
• 15 metres (50 ft) from a property line (may be waived by adjacent owner agreement)
• 30 metres (100 ft) from underground fuel storage
• 100 metres (330 ft) from certain livestock operations (varies by type and size)

Your municipality may impose stricter setbacks. Always confirm with local planning or building offices before siting a new well.

No. Ontario Regulation 903 prohibits self-drilled wells regardless of property ownership. All wells must be drilled by a licensed water well contractor. An unregistered well cannot receive a provincial Well Record and may cause serious complications with:

• Property sales and title insurance
• Mortgage financing (most lenders require a registered well)
• Home insurance claims
• Potential prosecution under the Ontario Water Resources Act

Renfrew County's Canadian Shield geology produces a distinctive water chemistry. The most common issues in local wells include:

• Iron: Reddish-brown staining of fixtures and laundry. Very common in Shield wells; treated with iron filters or water softeners.
• Manganese: Black staining, neurological concerns at high concentrations. Often co-occurs with iron.
• Hardness: High dissolved calcium and magnesium from granite dissolution. Scale buildup in appliances and pipes.
• Arsenic: Naturally occurring from rock minerals. Some Renfrew County wells exceed Health Canada's guideline of 10 µg/L. Point-of-use reverse osmosis is an effective treatment.
• Coliform bacteria: Particularly after spring snowmelt or heavy rain events. Annual testing is strongly recommended.
• Radon: Dissolved radon gas from uranium-bearing Shield rock. Aeration treatment reduces levels effectively.

The Ministry of the Environment, Conservation and Parks maintains a public Well Record archive searchable at ontario.ca (search "Ontario well record"). You can search by address, coordinates, or well tag number (a metal tag affixed to the casing). Records show original drilled depth, casing specifications, reported yield, and water quality at time of drilling.

Records for wells drilled before 1992 may be incomplete or missing. If your property is older and you cannot locate a well record, have the well inspected and documented by a licensed well technician.

Well shocking (chlorination) is the process of adding a measured concentration of chlorine to the well to kill bacteria, then flushing until chlorine clears. It is typically performed after:

• New well installation (standard practice)
• Pump replacement or any work that opens the casing
• A positive bacteria test result
• Flooding events that may have introduced surface water near the wellhead
• Extended periods of non-use (seasonal cottages in Renfrew County)

The Ontario Ministry of Health publishes a detailed well chlorination procedure. After shocking, the well must be re-tested and show clear bacteriological results before the water is used for drinking.

Renfrew County winters are severe — ground frost penetrates to 4–5 feet in most areas, and temperatures regularly fall to −25°C or below. Key winterization considerations:

• Water line depth: All buried supply lines should be below the frost line. If a line is marginal depth, heat tape is an emergency option.
• Wellhead: Confirm the well cap is properly seated to prevent cold air infiltration into the casing.
• Pressure tank: Kept in a heated space; if in a crawlspace, ensure adequate heat reaches it.
• Cottage winterization: Drain the pressure tank, blow out pump line, shut off power to the pump. A licensed well technician should supervise any blow-out procedure.
• Spring startup: Inspect wellhead for frost heave or rodent damage before turning system back on.

Drilled wells in Renfrew County's bedrock are durable structures. A properly installed well with steel casing and a watertight sanitary seal can function for 30–50+ years with few structural issues. The pump and pressure tank are the mechanical components that wear out first:

• Submersible pump: 10–15 years (quality and duty cycle dependent)
• Pressure tank: 10–12 years (bladder type); can last longer with annual pressure checks
• Electrical controls: 15–25 years
• Steel casing: 40–70+ years in Renfrew County's generally low-corrosivity Shield water