Sterling offers 7 watersense certified toilets models in the lineup we track. This page is the Sterling-specific cut of the broader EPA WaterSense Certified Toilets toilets category — same product class, narrowed to the Sterling catalog only.
Sterling is a Kohler Company subsidiary brand (acquired by Kohler in 1984), positioned as the volume tract-builder and value-residential plumbing line. Manufactured in Wisconsin alongside Kohler products but engineered to a different price point — Sterling toilets, faucets, and showers are stocked at Home Depot and Lowes as the "Kohler-quality without the Kohler price" alternative. The toilet line includes the Stinson, Karsten, and Riverton series — primarily two-piece elongated 1.28 GPF models for new-construction spec houses.
For the complete Sterling lineup across all sub-types and capacities, see the Sterling Toilets hub.
If you're cross-shopping watersense certified toilets beyond Sterling, the following brands also ship in this category:
EPA WaterSense is the federal voluntary water-efficiency certification program. A WaterSense-certified toilet uses 1.28 gallons per flush or less AND meets a minimum flush performance threshold (MaP score 350g+). Buying WaterSense-certified is the simplest way to ensure you're getting a real high-efficiency toilet, not just a label.
A 1.28 GPF toilet that won't reliably flush solid waste isn't actually water-saving — owners double-flush, defeating the savings. WaterSense certification requires the toilet to pass the MaP (Maximum Performance) test, which measures how much simulated solid waste the toilet clears in a single flush. The minimum threshold is 350g; most WaterSense-certified toilets test at 600–1,000g, well above the threshold.
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For the complete watersense certified buyer's guide (all brands, full comparison framework), see the EPA WaterSense Certified Toilets category hub.
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