Updated September 28, 2026
Toilet MaP Scores Explained: How to Pick a Toilet That Won't Clog
“Will it clog?” is the question nobody can answer in the store. MaP testing answers it with a number, and almost nobody checks it.
What a MaP score is
MaP (Maximum Performance) is independent, third-party flush testing. Each toilet is loaded with a measured amount of test media, soybean paste plus toilet paper, and the score is the grams it removes completely in a single flush. The scale tops out at 1,000 grams.
What's a good score
- 350 g: the minimum to earn the EPA WaterSense label.
- 500 g and up: excellent everyday performance.
- 600 g+ at 1.1 gallons or less: the MaP PREMIUM rating.
- 1,000 g: the top of the scale.
Source: MaP Testing.
The scores of the toilets we install
| Toilet | MaP score | Flush | Installed |
|---|---|---|---|
| Glacier Bay Power Flush, chair height, elongated | 1,000 g | 1.28 gpf, WaterSense | $599 |
| American Standard Colony 3, chair height, elongated | 800 g | 1.28 gpf, WaterSense | $649 |
| KOHLER Elmbrook, chair height, elongated | 1,000 g | 1.28 gpf, WaterSense | $749 |
Scores from MaP Testing, all tank-type toilets report, Feb 14 2025.
Why a score this high matters
Early low-flow toilets from the 1990s earned a reputation for double-flushing and clogging. Modern bowls and flush valves fixed that, but only in toilets engineered to. A high MaP score is the proof, and it's why every toilet we offer scores 800 grams or more. Pick yours.
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