Blog · Waterloo
What to Do with Leftover Paint in Waterloo: Keep, Label or Drop Off
Every paint job ends with partial cans. Some are worth keeping, some should go, and in Waterloo Region the ones that go have a free and simple place to go.
Last updated September 25, 2026 · Reviewed by the Waterloo Painters team
Leftover paint piles up faster than most people expect. A single room repaint can leave a half-can of wall colour, a quart of trim enamel and a can of primer. A student rental with six bedrooms, or a house repainted over several years, ends up with a basement shelf of cans that nobody can identify. Here is how to decide what to keep, and where the rest goes.
Where paint goes in Waterloo Region
Paint is collected as household hazardous waste by the Region of Waterloo, not by the City. The Region runs two household hazardous waste depots that accept it:
- Waterloo: 925 Erb Street West, Gate 2
- Cambridge: 201 Savage Drive
The Region's list of accepted items covers all paints (interior, exterior and marine), stains and coatings, varnishes and urethanes, wood finishing oils and sealants. Drop-off of residential household hazardous waste is free, both at the Region's depots and at local businesses that take part in the paint stewardship program. The Region points residents to Product Care's locator to find retailers that take paint back. The one limit to note: the depots accept containers up to 25 litres. Hours vary by site and season, so check the Region's waste drop-off page before you load the car.
Paint does not belong in the garbage cart, down a sink or a storm drain, or poured out on the lawn. The Region notes that storm sewers carry water to local waterways without treatment.
What is worth keeping
Some leftover paint is valuable. The right can saves a full repaint when a wall gets scuffed or a hole gets patched.
- The current colour of every room. Keep at least a litre of each wall colour and each trim colour that is actually on the walls now.
- Ceiling white. Ceiling paint is often a specific flat white. Matching it later by eye rarely works.
- Anything custom-tinted. A store can remix a colour from a formula, but the sheen and the batch can differ. The original can is a better touch-up match.
What to let go: colours no longer on any wall, cans that have frozen (latex that has frozen and thawed often turns lumpy and will not mix smooth), paint that smells sour or has separated into a layer that will not stir back in, and anything so old that the label has worn off and nobody knows what it is.
Label cans so they are useful later
An unlabelled can is almost as bad as no can. When a room is finished, the painter should leave the leftovers labelled, and it is worth asking for this in the quote:
- The room and surface it was used on (for example, "Bedroom 3 walls" or "Main floor trim").
- The brand, product line, sheen and colour name or code.
- The date it was applied.
Store cans indoors where they will not freeze, off a concrete floor, with the lid tapped down tight. A strip of plastic wrap under the lid helps the seal.
Rental and condo owners: build a touch-up kit
Waterloo landlords who turn units over every April and August get the most from this. A standard colour spec for every unit (one wall colour, one trim, one ceiling) means one set of cans covers every room in the building, and a quick turnover needs only patching and touch-ups instead of a full coat. See rental turnover painting for how that spec works in practice.
Condo owners uptown have a different reason to keep paint. Storage is tight, but the building may have specified colours for suite entry doors or other surfaces, and a small can of each is worth the shelf space. See condo and apartment painting.
What the painter does with leftovers
On most jobs, the painter buys enough to finish and leaves the usable remainder with the owner, labelled. Empty and near-empty containers and the painter's own waste, such as used rollers and wash-out, are the painter's to deal with. If you would rather not keep any leftovers, say so before the job starts, so the quantities can be ordered tighter.
If you are clearing out a basement of old cans before a move or a sale, sort them first: keep the labelled current colours for the new owner, and take everything else to the depot in one trip. Oil-based paint and old stains, common in older houses in Mary-Allen and in the villages of St. Jacobs and Elmira, go to the depot the same as latex.
Empty cans and dried-out paint
A can that is completely empty, or one where the last centimetre has dried hard, is still easiest to deal with at the depot along with the rest. If you are unsure whether something is accepted, check the Region's household hazardous waste page, which lists the accepted categories, before you go.
Ready to paint, or to finish what you started
If you have the leftover cans but not the time, the painter can use your existing paint for touch-ups and match the rest. For how work is priced, see the Waterloo painting cost guide, or book a visit to have the job looked at.