WaterSense Certified Toilets: Complete 2026 List

The TOTO Drake II is the benchmark WaterSense toilet, achieving a MaP score of 1,000 grams at 1.28 GPF through TOTO's Double Cyclone flush system, which uses two nozzles to create a powerful centrifugal flow across the entire bowl surface.

The Drake II uses TOTO's Double Cyclone technology, which replaced the older G-Max system starting around 2011. Instead of a single large siphon jet, it routes water through two rim nozzles that work in concert to produce a wide, spiraling wash. This design reduces water use while dramatically increasing bowl coverage compared to older 1.6 GPF siphonic designs.

Aggregated owner feedback consistently praises the Drake II for not requiring double flushing, even in high-use households. The CeFiONtect glaze is a meaningful differentiator: TOTO's proprietary ionic barrier layer makes the vitreous china surface measurably smoother than standard glazing, reducing the adhesion of waste and mineral deposits. Owners report the bowl stays cleaner between scrubbing sessions.

The TOTO UltraMax II brings the same Double Cyclone technology and 1,000-gram MaP score as the Drake II into a seamless one-piece form factor, eliminating the tank-to-bowl junction that accumulates grime in two-piece designs.

The UltraMax II is essentially the Drake II engine packaged in a streamlined, skirted housing. The flush performance is identical: 1.28 GPF, Double Cyclone system, CeFiONtect glaze, and WaterSense certification. The meaningful difference is the one-piece configuration, which eliminates the seam between tank and bowl where moisture, mildew, and mineral deposits commonly collect in two-piece designs.

For households where bathroom aesthetics matter -- master baths, renovated powder rooms, rental properties targeting higher-end tenants -- the UltraMax II's cleaner silhouette justifies the price premium over the Drake II. Aggregated owner reviews rate it very highly for ease of cleaning, with many noting the absence of crevices makes weekly maintenance significantly faster.

The TOTO Aquia IV adds a 0.9 GPF liquid-waste flush option to a WaterSense certified platform, making it the most water-efficient option in TOTO's mainstream lineup while maintaining a 1,000-gram MaP score on the full flush.

The Aquia IV uses a top-mounted dual-flush actuator -- a rectangular button on the tank lid -- that many users find less intuitive initially than a traditional side handle. However, the mechanism is reliable and the split-flush logic is straightforward: partial press for liquid waste at 0.9 GPF, full press for solid waste at 1.28 GPF. In a household where the 0.9 GPF option is used consistently for appropriate flushes, annual water consumption per toilet drops significantly below even a standard 1.28 GPF WaterSense model.

TOTO's WASHLET compatibility is a notable selling point for the Aquia IV platform. Several Aquia IV models are designed to accept TOTO's WASHLET bidet seat integration, allowing owners to add a bidet seat later without compatibility concerns. The CEFIONTECT glaze and the ceramic quality are identical to the Drake II series.

Kohler's Cimarron consistently earns 1,000-gram MaP scores at 1.28 GPF while carrying the WaterSense label, making it the strongest value proposition in a mid-market price range for households that want proven performance without paying a TOTO premium.

Kohler's Cimarron uses a Class Five flush system with a 3-1/4 inch canister flush valve that opens completely on each flush, maximizing water flow. The 2-1/8 inch trapway is comparable to TOTO's specs, and aggregated MaP data confirms the Cimarron achieves the 1,000-gram maximum score at 1.28 GPF, which is exceptional at its price point.

The Comfort Height seat position at approximately 16.5 inches from floor to seat puts it in ADA-compliant territory, making it easier for taller adults and users with mobility limitations. For best flushing toilets recommendations at the mid-market price tier, the Cimarron is the default recommendation because it balances flush power, brand support infrastructure, and broad availability better than any comparable model.

The American Standard Champion 4 features a massive 4-inch flush valve and 2-3/8 inch trapway -- the widest trapway among mainstream WaterSense certified toilets -- producing the largest water pathway and some of the strongest clog resistance available at 1.28 GPF.

American Standard's Champion 4 platform was originally engineered to solve chronic clogging in high-traffic residential settings. The 4-inch flush valve is nearly 60 percent wider than the 2.5-inch valves used in most competing models, creating a significantly faster water rush through the bowl. Combined with the 2-3/8 inch trapway, the Champion 4 produces a water column that physically cannot clog on typical household waste.

The WaterSense 1.28 GPF version maintains the same core engineering as the original 1.6 GPF Champion 4, with internal tank adjustments to reduce fill volume. The flush remains authoritative and owners across aggregated review data consistently report that the Champion 4 is the most reliable toilet they have owned for households with children, older adults, or other frequent plunging issues. See also our guide on best toilets for frequent clogs for more context.

The American Standard Cadet 3 FloWise in round-front configuration is one of the most space-efficient WaterSense certified toilets available, with a round bowl that reduces the overall footprint while maintaining a MaP score above 600 grams at 1.28 GPF.

For powder rooms, half-baths, and bathrooms under 40 square feet, the round-front Cadet 3 FloWise is the most practical WaterSense choice. The bowl depth savings of roughly 2 inches over an elongated equivalent can be the difference between comfortable door clearance and a space that feels cramped.

The Cadet 3's EverClean antimicrobial surface is an American Standard proprietary treatment that inhibits bacterial and mold growth on the bowl surface, similar in concept to TOTO's CeFiONtect but applied as a chemical treatment rather than a glaze modification. Owners report it works adequately in practice, though not quite as impressively as TOTO's approach. For small bathroom toilet guidance, the Cadet 3 round-front FloWise remains the default recommendation.

The Woodbridge T-0001 delivers a skirted, contemporary one-piece profile with dual-flush WaterSense certification at a price point significantly below TOTO and Kohler competitors, with a published MaP score above 800 grams on the full 1.28 GPF flush.

Woodbridge has built a strong reputation for delivering premium-looking toilets at accessible price points. The T-0001's fully skirted exterior eliminates the exposed trapway, giving it the clean silhouette of toilets that cost two to three times as much. The dual-flush top-mount button functions correctly in the vast majority of owner-reported experiences, though a small percentage of users report fill-valve adjustment needs during the first few months.

At the 800-gram MaP score, the T-0001 performs meaningfully better than the 350-gram WaterSense minimum and handles typical household waste reliably. It is not in the same tier as the Champion 4 or Drake II for extreme load scenarios, but for a typical household without chronic clogging history, the performance gap is rarely noticed in practice. For more on this brand, see our detailed Woodbridge T-0001 review.

Gerber's Viper is a contractor-favorite WaterSense certified toilet that achieves a MaP score around 900 grams at 1.28 GPF with a straightforward siphonic action and durable tank components, making it a reliable workhorse at a mid-range price point.

Gerber is less well-known among consumers than TOTO or Kohler, but it has a strong reputation in the plumbing trade. The Viper's internal components are deliberately simple: a standard 3-inch tower-style flush valve and a reliable fill valve that plumbers can replace with common parts from any supply house. This simplicity translates to lower long-term maintenance costs compared to proprietary systems.

For landlords and property managers who want a reliable WaterSense toilet that any plumber can service without brand-specific parts, the Gerber Viper is a practical choice that the TOTO and Kohler options, despite their superior flush technology, cannot fully match in serviceability terms. Our overview of best Gerber toilets covers the full lineup for further reference.