What Ontario regulations apply to paint disposal and leftover paint in Ottawa?

Paint disposal in Ontario is more regulated than most Ottawa homeowners realize, and throwing leftover paint in the garbage or pouring it down the drain can land you in real trouble. Here is what you need to know about the rules and how to handle your leftover paint properly.

The Core Regulation: Ontario's Blue Box and Hazardous Waste Rules

Paint is classified under Ontario's Environmental Protection Act (EPA) and regulated through several overlapping frameworks:

1. Ontario Regulation 347 — Hazardous Waste

Liquid paint — whether latex or oil-based — cannot be placed in regular household garbage in Ontario. Oil-based paints, stains, and varnishes are classified as hazardous waste due to flammable solvents and toxic compounds. Even water-based latex paint is considered a special waste that requires proper handling.

Key rules:

• Never pour paint down any drain — storm drains, sinks, toilets, or sewer cleanouts. This violates both the Ontario EPA and Ottawa's Sewer Use Bylaw (2003-514)
• Never put liquid paint in your garbage or recycling bin
• Oil-based paint, stain, and varnish are hazardous waste and must go to an approved collection facility
• Aerosol paint cans are pressurized containers and must be handled as hazardous waste if not completely empty

2. Product Care Association of Canada (formerly Stewardship Ontario)

Ontario participates in the national paint stewardship program run by Product Care. This industry-funded program ensures that leftover paint is collected and either recycled, processed into new products, or disposed of safely. Every can of paint sold in Ontario includes an environmental handling fee (typically $0.25 to $1.50 per container) that funds this program.

This means there are free drop-off locations throughout Ottawa where you can bring leftover paint at no additional cost.

Where to Dispose of Paint in Ottawa

City of Ottawa Household Hazardous Waste Depots

Ottawa operates two permanent depots plus seasonal collection events:

• Trail Road Household Hazardous Waste Depot (Nepean) — open year-round, specific days and hours posted on ottawa.ca
• Ottawa Hazardous Waste Depot — seasonal/rotating locations announced each spring

Accepted items include latex paint, oil-based paint, stain, varnish, paint thinner, aerosol paint, and paint-related chemicals. No charge for residential quantities.

Product Care Drop-Off Locations

Many Ottawa retailers accept leftover paint through the Product Care program. Common drop-off points include select Home Hardware, RONA, and Dulux store locations. Check productcare.org for the nearest Ottawa location.

What They Accept

• Latex and acrylic paint (any condition)
• Oil-based paint, stain, varnish
• Paint thinner and mineral spirits
• Aerosol paint cans
• Paint primers and sealers

What They Do NOT Accept

• Industrial or commercial quantities (over 50 litres per visit at most depots)
• Dried-out paint that has been solidified (this can go in regular garbage — see below)
• Two-part epoxy coatings or automotive paint (these require specialized disposal)

The Dried Paint Exception

Here is a useful rule: completely dried latex paint can go in your regular garbage in Ottawa. If you have small amounts of leftover latex paint (a few centimetres in the bottom of a can), you can:

Remove the lid

Add kitty litter, sawdust, or a commercial paint hardener (available for $5 to $10 at hardware stores)

Let it dry completely — solid all the way through

Place the open can with hardened paint in your regular garbage

This does NOT apply to oil-based products. Oil-based paint must always go to a hazardous waste depot regardless of condition.

Contractor Obligations

If you hire a painting contractor, they are responsible for disposing of their own waste properly. Under Ontario's EPA, a contractor who dumps paint waste illegally can face fines of up to $100,000 for a first offence and up to $200,000 for subsequent offences, plus potential imprisonment.

A professional painter should:

• Take leftover paint with them when the job is done (unless you want to keep touch-up amounts)
• Never dump wash water containing paint into your yard, driveway, or storm drains
• Transport paint waste in sealed containers in compliance with the Transportation of Dangerous Goods Act for oil-based products
• Provide receipts from proper disposal facilities if you request them

How Much Paint Will Be Left Over?

For a typical Ottawa home interior repaint, expect 2 to 5 litres of leftover paint from colour matching, touch-up reserves, and partial cans. For exterior work, leftovers can range from 4 to 10 litres depending on project size. A good painting contractor will calculate quantities accurately to minimize waste, which also saves you money at $50 to $90 per gallon for quality paint.

Smart Practices to Reduce Waste

• Buy the right amount: Your contractor should measure carefully. One gallon covers roughly 350 to 400 square feet on smooth surfaces
• Keep touch-up paint: Store 500 ml to 1 litre of each colour for future touch-ups. Label the can with the room, colour name, and date
• Store properly: Latex paint stored in a sealed can in a cool, dry space (not your garage in Ottawa's winter — it will freeze and become unusable) can last 5 to 10 years
• Donate usable paint: Organizations like Habitat for Humanity ReStore in Ottawa accept unopened or gently used paint

Finding a Responsible Painter

When you hire a contractor, ask about their waste disposal practices. It tells you a lot about their overall professionalism. You can browse experienced local professionals through the Ottawa Construction Network directory at ottawaconstructionnetwork.com, where Ottawa Paint Contractors features painters who follow Ontario's environmental and safety regulations as part of their standard work practices.

The rules are straightforward: never pour, never trash liquid paint, use the free depot and drop-off programs, and make sure your contractor does the same.