Scroll any toilet listing in Canada and you will eventually see a badge that reads something like "MaP 1,000 g". It looks impressive, and manufacturers know it. But what does a MaP score actually tell you, what number do you genuinely need, and when does chasing the maximum stop paying off? Here is the plain-language version.
What a MaP score actually measures
MaP stands for Maximum Performance. It is an independent testing program launched in 2003 by a group of Canadian and American water utilities and industry specialists who were tired of early low-flow toilets that saved water but clogged constantly. The program has genuine Canadian roots, with much of the original testing work based in Ontario, and its results have quietly shaped toilet design across North America.
The test itself is refreshingly literal. Technicians load the bowl with soybean paste test media in thin casings, along with loose paper, then flush once. The score is the number of grams the toilet clears in that single flush. Testing runs in increments up to 1,000 grams, and 1,000 is the ceiling of the protocol, not a measure of anything beyond it. Because the method is standardized and results are published independently, scores are directly comparable across brands. That is what separates a MaP number from a marketing slogan.
Why 600 grams is the practical bar
The research behind the program found that real-world demands are far smaller than the test maximum. Everyday use rarely approaches even 250 grams, and MaP's own guidance has long suggested that roughly 350 grams covers the needs of most households. So why do we point customers toward 600 grams and up?
- Headroom. A 600 gram performer clears typical use with plenty to spare, which is what prevents the double-flush habit that wastes water.
- Busy households. Kids, guests, a basement bathroom that works hard on weekends: margin matters more than averages.
- Aging gracefully. Mineral scale in hard-water regions, common across the Prairies and parts of Ontario, slowly narrows rim jets. Starting with headroom means the toilet still performs a decade in.
Above 600 grams, returns diminish quickly. A household will almost never notice the difference between an 800 gram toilet and a 1,000 gram toilet; both clear real-world use in one flush. If two models fit your bathroom and budget, choose on bowl design, seat height, and brand support rather than the last 200 grams.
One designation worth knowing: MaP PREMIUM. It pairs a 600 gram minimum with a stricter water-use limit, flagging toilets that perform well while using less water per flush. That is a handy shortcut if water bills, a septic system, or a rural well are part of your picture.
MaP scores versus marketing claims
Brand flush systems are real engineering, but their names are marketing. TOTO's Tornado Flush, Kohler's Class Five, Caroma's dual-flush platforms: these describe how a toilet moves water, not how it performed on an independent bench. A trademarked name is not comparable between brands; a MaP number is. Happily, the two usually line up, and the major brands sold in Canada, including TOTO, Kohler, American Standard, Duravit, Caroma, and Icera, post strong MaP results across most of their current lines.
It also helps to separate performance ratings from safety certifications. CSA and cUPC marks tell you a toilet was built to the standards Canadian plumbing codes expect, which is what your local inspector cares about; they say nothing about flush performance. You want both, and they come from different places. If certification marks are new territory, our guide to CSA and cUPC certifications explains what those little logos actually mean.
Where to find MaP scores
The MaP program maintains a free, searchable public database at map-testing.com listing thousands of tested models, and many manufacturer spec sheets quote the score directly. Two habits will keep you accurate:
- Match the exact model number. Scores are tested per configuration. A different tank, flush volume, or bowl pairing can carry a different score, so confirm the specific combination you are ordering.
- Note the flush volume beside the score. A strong score at 6 litres per flush and a strong score at 4.8 litres are different achievements.
Reading the rest of the document matters too. If spec sheets still look like alphabet soup, we cover the whole skill in how to read a plumbing spec sheet before ordering.
Beyond the score: what the test cannot tell you
MaP measures bulk removal in a single flush. That is one job of a toilet, not all of them. A few things the number does not capture:
- Bowl wash. How thoroughly water sheets across the bowl surface. Rim design and glazing quality decide whether the bowl stays clean between scrubbings, and some high-scoring toilets are only average here.
- Trapway design. A fully glazed trapway resists clogs and streaking, and a wider trapway shrugs off what a narrower one catches. Skirted designs hide the trapway entirely, which makes cleaning far easier.
- Drainline carry. Clearing the bowl is step one; moving waste down the branch line is step two. This matters in older housing stock from Halifax to Victoria, where long, flatter drain runs are common.
- Fit and comfort. Comfort height versus standard, round versus elongated, and whether the toilet matches your rough-in. Our guide to measuring a 10 inch versus 12 inch rough-in prevents the most common ordering mistake in this category.
Dual-flush models add one wrinkle: the published MaP score applies to the full flush, while the reduced flush is intended for liquids only. If that style appeals to you, our practical dual-flush buying guide for Canada walks through the honest trade-offs.
How to choose without fixating on the number
Here is the short version of how we help customers shop our toilet collection, whether the order is heading to Vancouver, Winnipeg, Montreal, or St. John's:
- Confirm your rough-in, space, and bowl shape first. No score fixes a toilet that does not fit.
- Set 600 grams as your floor, then treat anything above it as a pass, not a ranking.
- Pick a flush volume you are comfortable with, and check the score at that volume.
- Judge what MaP cannot: glazed trapway, rim wash, skirted or exposed sides, seat height, lid quality.
- Favour brands with solid parts availability in Canada, because a fill valve or seat hinge should never be a special import.
Follow that order and the score becomes what it should be: a quick filter that removes weak performers, not a leaderboard to obsess over.
Frequently asked questions
Is a 1,000 gram MaP score toilet better than an 800 gram one?
Not in any way you will notice day to day. Once a toilet passes the 600 gram bar with room to spare, differences in bowl wash, trapway glazing, and fit matter more than the remaining grams.
Do wall-hung and smart toilets have MaP scores?
Many do. Wall-hung models from brands like Geberit, Duravit, and TOTO are tested as bowl and in-wall carrier combinations, so check that the listed score matches your exact pairing. Integrated smart toilets are tested the same way as any other model, and the flush performance question is identical.
Is MaP testing a government program?
No. It is an independent program started by Canadian and American water utilities and industry specialists, with testing performed by independent labs. Participation is voluntary, so a missing score is not automatically a red flag, though a published one is the more transparent choice.
Does a higher MaP score mean the toilet uses more water?
No. Every toilet is tested at its rated flush volume, and many of the strongest scores today come from efficient designs. The MaP PREMIUM designation exists precisely to highlight models that combine a 600 gram minimum with low water use per flush.
