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Best Flushing Toilets
Water Efficiency Guide

Water Efficient Bathroom Remodel: Upgrade ROI Guide

A practical, data-driven guide to every bathroom fixture upgrade that cuts water use, lowers utility bills, and qualifies for rebates -- with real savings numbers from EPA, utility districts, and published MaP data.

Why Trust Best Flushing Toilets

Research updated June 2026.

Quick Answer

A complete water-efficient bathroom remodel -- replacing a pre-1994 toilet, an older showerhead, and standard faucets with EPA WaterSense-certified models -- saves the average household 15,000 to 25,000 gallons per year and typically returns its investment within 3 to 7 years through utility bill reductions alone, before counting any available rebates.

What Does a Water Efficient Bathroom Remodel Actually Cost?

A focused water-efficiency bathroom remodel -- swapping the toilet, showerhead, and faucets for WaterSense-certified models -- typically runs $400 to $1,800 in materials, plus $150 to $600 for professional installation of the toilet. Full remodels that include tiling, vanity, and layout changes range from $8,000 to $25,000, but the water-saving fixture upgrades represent a small, high-ROI slice of that budget. Many utility districts and state programs offer $50 to $200 rebates per fixture that can cut your out-of-pocket cost by 20 to 40 percent.

Knowing where your water actually goes is the first step to spending the remodel budget wisely. According to the EPA WaterSense program, the average American household uses about 300 gallons of water per day indoors. Bathrooms account for roughly 60 percent of that total, split across three main fixtures:

  • Toilet flushing -- 24 percent of total indoor use
  • Showers -- 20 percent
  • Faucets -- 19 percent

That breakdown tells you exactly where to invest. A best flushing toilet that qualifies for WaterSense certification uses no more than 1.28 gallons per flush (GPF), compared to 3.5 to 7 GPF for toilets installed before 1994. The math compounds fast with a family of four.

How Much Water Does Replacing a Toilet Actually Save Per Year?

Replacing a pre-1994 toilet that used 3.5 GPF with a 1.28 GPF WaterSense model saves approximately 13,000 gallons per household per year, based on the EPA's estimate of five flushes per person per day in a family of four. Upgrading from a 1.6 GPF standard toilet to a 1.28 GPF model still saves roughly 4,000 gallons annually for the same household size. Over a 10-year fixture lifespan, that represents 40,000 to 130,000 gallons of water saved.

The toilet is the single highest-leverage fixture in a water-efficient bathroom remodel. Here is a direct comparison of the most common GPF tiers and their annual household water cost impact using an average U.S. water rate of $0.0035 per gallon (combined water and sewer):

Toilet Type GPF Rating Annual Use (4-person household) Annual Cost Estimate WaterSense Certified
Pre-1994 standard 3.5 -- 7.0 GPF 25,550 -- 51,100 gal $89 -- $179 No
Standard 1.6 GPF 1.6 GPF 11,680 gal $41 No
WaterSense 1.28 GPF 1.28 GPF 9,344 gal $33 Yes
High-efficiency 1.0 GPF 1.0 GPF 7,300 gal $26 Yes (most models)
Dual-flush (avg 1.1 GPF) 0.8 / 1.6 GPF ~8,030 gal $28 Yes (most models)

Calculation assumes 5 flushes per person per day, 4-person household, 365 days. Water plus sewer cost at $0.0035/gal average.

Expert Take

MaP testing data shows that WaterSense certification does not mean sacrificed performance. Many 1.28 GPF toilets -- including the TOTO Drake II, Kohler Cimarron, and American Standard Champion 4 -- earn MaP scores of 800 to 1,000 grams (the maximum tested), meaning they clear solid waste as effectively as older 3.5 GPF models. The efficiency gain comes from improved siphon and trapway engineering, not reduced flushing power.

Which Water-Saving Toilet Models Offer the Best Flush Performance?

The TOTO Drake II (1.28 GPF, Double Cyclone flush) and the American Standard Champion 4 (1.6 GPF, but with a 4-inch wide trapway) consistently earn MaP scores at or near 1,000 grams, the highest performance tier in independent flush testing. The Kohler Cimarron Comfort Height at 1.28 GPF and the TOTO UltraMax II (one-piece, 1.28 GPF) also score above 800 grams MaP while meeting EPA WaterSense criteria. For ultra-low-use applications, the TOTO Aquia IV dual-flush (0.8/1.0 GPF) delivers 600+ grams MaP at minimal water volume.

When planning a water-efficient bathroom remodel, selecting a toilet that is both certified efficient and proven to flush reliably eliminates the common fear that low-flow means frequent clogs. Below is a comparison of the top-performing models across flush efficiency and MaP scores:

Model GPF MaP Score Flush System WaterSense Bowl Shape
TOTO Drake II 1.28 1,000g Double Cyclone Yes Elongated
American Standard Champion 4 1.6 1,000g Pressure-assisted No Elongated
Kohler Cimarron 1.28 800g Canister flush valve Yes Elongated
TOTO UltraMax II 1.28 1,000g Double Cyclone Yes Elongated
TOTO Aquia IV 0.8 / 1.0 600g+ Dual-flush Tornado Yes Elongated
American Standard Cadet 3 1.28 800g Siphon Action Yes Round / Elongated
Woodbridge T-0001 1.28 800g One-piece siphon Yes Elongated
Swiss Madison Concorde 1.28 700g Single-flush siphon Yes Elongated
Gerber Avalanche 1.28 1,000g Gravity siphon Yes Elongated

See our full EPA WaterSense toilets roundup for current model rankings and detailed performance data.

How Do Showerheads and Faucets Contribute to Bathroom Water Savings?

Standard showerheads manufactured before 1992 often flow at 2.5 to 4.0 gallons per minute (GPM); a WaterSense-certified showerhead must use 2.0 GPM or less. For a family of four each showering 8 minutes daily, that single swap saves over 8,700 gallons per year. WaterSense bathroom faucet aerators, rated at 1.5 GPM or less compared to the standard 2.2 GPM, add another 700 to 1,400 gallons per faucet per year in a typical household.

Fixture-by-fixture water savings stack up significantly when combined in a single remodel project. The table below shows potential annual savings for a 4-person household replacing all three bathroom fixture types:

Fixture Old Flow Rate WaterSense Rate Annual Savings (4-person)
Toilet (from 3.5 GPF) 3.5 GPF 1.28 GPF ~16,200 gal / yr
Showerhead 2.5 GPM 2.0 GPM ~5,840 gal / yr
Bathroom faucet (x2) 2.2 GPM 1.5 GPM ~1,800 gal / yr
Total combined -- -- ~23,840 gal / yr
Expert Take

The EPA estimates that if every U.S. home replaced just their inefficient toilets with WaterSense models, America would save 520 billion gallons of water per year -- roughly the water that flows over Niagara Falls in about 11 days. On the household level, that translates to $110 per year in reduced utility costs for the average family replacing a pre-1994 toilet.

What Rebates and Incentives Are Available for Water-Efficient Bathroom Upgrades?

More than 1,000 U.S. water utilities offer rebates for WaterSense-certified toilet replacements, with amounts typically ranging from $50 to $200 per toilet and sometimes covering 100 percent of fixture cost for qualifying low-income households. Some state programs, including California's SoCal Water Smart and Colorado's Denver Water program, stack rebates with federal tax incentives for qualifying efficiency projects. The EPA's WaterSense rebate finder at epa.gov/watersense/rebate-finder lists current programs by ZIP code.

Rebates are often the fastest way to improve the ROI calculation on a water-efficient bathroom remodel. The programs worth checking before purchasing any fixture include:

  • Local utility rebates -- Search at epa.gov/watersense or your utility's website. Many programs require that the replaced fixture be documented before disposal (photo or serial number).
  • State-level programs -- California (MWD and local agencies), Texas (SAWS, NTMWD), Colorado, Washington, Oregon, and Arizona all run active toilet rebate programs as of 2026.
  • Federal tax credits -- While direct toilet credits are uncommon, greywater and rainwater systems tied to toilet flushing may qualify under the Residential Clean Energy Credit in some interpretations. Consult a tax professional.
  • Manufacturer instant rebates -- TOTO and Kohler periodically offer mail-in or instant rebates on WaterSense-certified models through major retailers.

Always keep your purchase receipt and, if required, the serial number from the old fixture to support rebate claims. Learn more in our guide to toilet rebates in 2026.

How Should You Prioritize Upgrades in a Water-Efficient Bathroom Remodel?

Prioritize the toilet first because it accounts for the largest share of indoor bathroom water use and delivers the greatest per-dollar savings. Follow with the showerhead, which has the next-highest volume impact and the lowest installation cost. Replace faucet aerators last -- they are cheap, DIY-friendly, and deliver meaningful savings per aerator. If budget allows all three simultaneously, you maximize rebate bundling opportunities offered by many utility programs.

A structured upgrade sequence helps you get the highest water savings per dollar spent regardless of whether you are doing a full remodel or just targeting efficiency gains:

Step 1: Assess Your Current Fixture Efficiency

Check the GPF stamped on the back of your toilet tank lid or on the underside of the tank lid. Toilets made before 1982 typically use 5 to 7 GPF. Toilets from 1982 to 1993 use 3.5 GPF. Models from 1994 to 2010 are usually 1.6 GPF. Post-2010 models with WaterSense labels run 1.28 GPF or less. For showerheads, check the manufacturer label or use a simple bucket test: place a 1-gallon bucket under the showerhead and time how long it takes to fill. Under 24 seconds means more than 2.5 GPM.

Step 2: Verify MaP Score Before Buying a New Toilet

The MaP (Maximum Performance) testing program, run independently at map-testing.com, evaluates how many grams of solid waste simulant a toilet clears in a single flush. A score of 600g is considered acceptable for residential use; 800g is good; 1,000g is the top rating. WaterSense certification alone does not guarantee a high MaP score, so cross-reference both certifications before selecting a model.

Step 3: Check Rough-In Measurement Before Ordering

The rough-in distance -- measured from the finished wall to the center of the floor drain -- determines which toilet models fit your bathroom. Standard rough-in is 12 inches, but many older homes have 10-inch or 14-inch rough-ins. Buying a toilet without verifying this is the most common and most expensive installation mistake. See our toilet rough-in measurement guide for step-by-step instructions.

Step 4: Stage Installation for Maximum Rebate Capture

Some rebate programs cap the number of fixtures per household per year. If you are replacing multiple toilets, check whether splitting purchases across a calendar year doubles your rebate eligibility. Photograph the old fixtures before removal, retain all new product packaging and receipts, and submit rebate applications within the program's required window, often 30 to 90 days post-installation.

Step 5: Address Running Toilets and Leaks First

A running toilet wastes 200 gallons per day on average, more than switching from a 3.5 GPF to a 1.28 GPF model would save in an entire year. If your existing toilet has a faulty flapper, a worn fill valve, or a slow leak detectable with a dye test, repairing those issues before or instead of a full replacement may deliver better short-term savings. However, toilets over 20 years old with recurring mechanical issues are typically better candidates for full replacement. See our repair vs. replace cost analysis for the full decision framework.

Expert Take

Dual-flush toilets -- which offer a 0.8 GPF option for liquid waste and 1.6 GPF for solid -- theoretically save the most water, but real-world savings depend on household usage habits. Independent studies and owner survey data suggest actual average flush volume in dual-flush households lands around 1.1 to 1.2 GPF, slightly better than a single-flush 1.28 GPF model. For families with children or anyone likely to always use the full flush, a high-MaP single-flush 1.28 GPF toilet often delivers more predictable savings and fewer maintenance calls than a dual-flush mechanism.

Calculating Your Remodel ROI

The simplest ROI framework for a water-efficient bathroom remodel looks like this:

Upgrade Typical Cost Annual Water Savings Annual Bill Savings Payback Period
Toilet (from 3.5 GPF, 4-person HH) $250 -- $600 ~16,200 gal ~$57 / yr 4 -- 11 yrs
Toilet (from 1.6 GPF, 4-person HH) $250 -- $600 ~2,920 gal ~$10 / yr 25 -- 60 yrs
WaterSense showerhead $25 -- $150 ~5,840 gal ~$20 / yr 1 -- 8 yrs
Faucet aerator (per faucet) $5 -- $20 ~900 gal ~$3 / yr 2 -- 7 yrs
Tankless water heater (bathroom) $600 -- $1,800 Reduces hot-water wait waste $50 -- $130 / yr 5 -- 30 yrs

Bill savings are water plus sewer at $0.0035/gal average. Combined water and sewer rates vary widely; check your utility bill for your local rate. Higher local rates shorten payback periods substantially. Rebates not included in cost column -- factor those in for your specific situation.

One metric often overlooked in ROI calculations is hot water savings. Reducing shower flow from 2.5 GPM to 2.0 GPM saves not only water volume but also the energy required to heat it. For a household using a conventional water heater, the EPA estimates that switching to a WaterSense showerhead saves about $70 per year in combined water heating and water supply costs, substantially improving the payback math.

Recommended Models by Upgrade Category

The following recommendations are based on published MaP scores, EPA WaterSense certification status, and aggregated owner review data from major retailers:

Best Toilet for Water Efficiency + Flush Power

The TOTO Drake II (CST454CEFG) at 1.28 GPF uses TOTO's Double Cyclone flushing system, which creates a centrifugal water action rather than a single-stream wash. MaP scores reach 1,000g consistently across independent tests. It is a two-piece elongated comfort-height toilet with TOTO's CeFiONtect ceramic glaze that resists buildup, reducing cleaning frequency and the need for harsh bowl cleaners.

Check price on Amazon

Best One-Piece Option

The TOTO UltraMax II (MS604114CEFG) delivers the same Double Cyclone performance in a seamless one-piece design that simplifies cleaning around the tank-to-bowl junction. At 1.28 GPF with a 1,000g MaP score, it earns WaterSense certification while functioning as a design upgrade in a bathroom remodel that includes new tile or vanity work.

Check price on Amazon

Best Budget-Friendly WaterSense Toilet

The American Standard Cadet 3 at 1.28 GPF offers an 800g MaP score and WaterSense certification at a lower price point than TOTO or Kohler premium lines. The concealed trapway on some Cadet 3 versions (Cadet 3 Concealed Trapway) adds a cleaner look for bathroom redesigns. American Standard's PowerWash rim scrubs the bowl with each flush, reducing the frequency of manual cleaning.

Check price on Amazon

Best Dual-Flush for Maximum Water Savings

The TOTO Aquia IV dual-flush (0.8/1.0 GPF) achieves the lowest per-flush water use of any widely available residential toilet. The TORNADO FLUSH system on the Aquia IV replaces traditional rim holes with two nozzles that generate a strong cyclonic rinse across the bowl surface. At an average of roughly 0.85 GPF with typical usage patterns, it is well-suited for households prioritizing minimum water consumption. Check the best dual-flush toilets guide for additional comparisons.

Check price on Amazon

Best Modern Design for Remodel Aesthetics

The Woodbridge T-0001 one-piece toilet offers a contemporary skirted trapway design at 1.28 GPF with WaterSense certification and an 800g MaP score. The concealed trapway makes cleaning significantly easier and gives the bathroom a high-design appearance consistent with modern remodel aesthetics. Owner reviews highlight the included soft-close seat as a notable value addition.

Check price on Amazon

Best WaterSense Showerhead for the Remodel

Look for WaterSense-certified showerheads rated at 2.0 GPM or below. High-pressure models from Kohler, Delta, and Moen with airinfusion or pressure-compensation technology maintain satisfying shower feel at lower flow rates. A 1.8 GPM airinfusion showerhead paired with a low-flow toilet adds up to meaningful savings with no perceptible drop in shower quality for most users.

Check price on Amazon

Faucet Aerators: The Cheapest Upgrade with Fastest Payback

Replacing a 2.2 GPM bathroom faucet aerator with a 1.5 GPM WaterSense-certified aerator costs $5 to $15 per faucet and takes under 5 minutes with no tools. For a household with two bathroom sinks, this upgrade pays back in under 2 years at average utility rates. Look for aerators labeled "WaterSense" at major home improvement retailers.

Check price on Amazon

Special Considerations for the Water-Efficient Bathroom Remodel

Greywater and Rainwater Systems

Greywater systems capture water from the bathtub, shower, and bathroom sinks and redirect it to toilet flushing or outdoor irrigation after basic filtration. In jurisdictions where permitted (California, Arizona, Texas, and others have established greywater codes), a greywater toilet-flushing system can effectively bring the toilet's net potable water consumption to near zero. These systems add $500 to $3,000 in installation cost but eliminate toilet water use from your utility bill entirely. Learn more in our guide to greywater toilet flushing.

Leak Detection During Remodel

A bathroom remodel is the ideal time to inspect toilet supply lines, flush valves, and fill valves for slow leaks that may have gone undetected. A silent toilet leak can waste 30 to 500 gallons per day. A simple dye test (drop food coloring in the tank; if color appears in the bowl without flushing, the flapper leaks) identifies the most common leak type in under 15 minutes.

Comfort Height and ADA Compliance

Comfort height toilets (17 to 19 inches from floor to seat) are more accessible for older users and those with mobility limitations, and they are available in all the same 1.28 GPF WaterSense configurations as standard height models. If your bathroom remodel includes ADA accessibility upgrades, combining comfort height with WaterSense certification adds no extra cost. See the ADA compliant toilet guide for dimensions and grab bar requirements.

Frequently Asked Questions

What is the minimum GPF for a WaterSense-certified toilet?

EPA WaterSense certification requires a maximum flush volume of 1.28 gallons per flush (GPF). Some models use 1.0 GPF or even 0.8/1.0 GPF in dual-flush configurations and still qualify as long as they also meet the program's MaP performance minimum of 350 grams, though many certified models far exceed that threshold.

Will a 1.28 GPF toilet flush as well as my old 3.5 GPF toilet?

Yes, in most cases. Modern 1.28 GPF toilets like the TOTO Drake II and American Standard Champion 4 use engineered siphon jets, wider trapways, and improved bowl geometry to achieve MaP scores of 800 to 1,000 grams -- scores that match or exceed the flush performance of pre-1994 high-volume models. The key is to verify the MaP score for your specific model at map-testing.com before purchasing.

How much can I save on my water bill by replacing my old toilet?

Replacing a pre-1994 toilet (3.5 GPF) with a 1.28 GPF WaterSense model saves a family of four roughly 16,000 gallons per year. At the U.S. average combined water-plus-sewer rate of approximately $0.0035 per gallon, that translates to about $56 per year in direct utility savings. Households in high-cost water markets like Southern California, Arizona, or the Northeast may see double or triple those savings.

Are dual-flush toilets more water-efficient than single-flush WaterSense models?

Potentially, yes, but it depends on household behavior. A dual-flush toilet with 0.8/1.6 GPF modes averages about 1.1 to 1.2 GPF in practice if users consistently choose the half-flush for liquid waste. A single-flush 1.28 GPF WaterSense toilet delivers exactly 1.28 GPF every flush. For households with consistent habits, dual-flush saves slightly more; for those who always use full flush, a reliable 1.28 GPF model is simpler and equally efficient.

What is a MaP score and why does it matter for a water-efficient remodel?

MaP (Maximum Performance) testing is an independent third-party program that measures how many grams of solid waste simulant a toilet can clear in a single flush. Scores range from 0 to 1,000 grams; residential use generally requires 350g minimum, while 600g is considered good and 800g to 1,000g is excellent. MaP scores matter because WaterSense certification only guarantees water efficiency, not flush performance -- checking MaP ensures you get both.

Do I need a plumber to install a new toilet during a bathroom remodel?

Not necessarily. Replacing a toilet with the same rough-in size is a DIY-accessible project that requires basic tools (adjustable wrench, putty knife, level) and typically takes 1 to 2 hours. However, if the rough-in dimension differs, the floor needs repair, or the supply line is old galvanized pipe, hiring a licensed plumber is advisable. Many plumbers charge $150 to $350 for a straightforward toilet swap, not including the fixture cost.

What is the rough-in measurement and how do I find mine?

The rough-in is the distance from the center of the floor drain (closet flange) to the finished wall behind the toilet. Measure with the old toilet in place by going from the wall to the center of the bolt caps at the base of the toilet. Standard rough-in is 12 inches, but 10-inch and 14-inch rough-ins are common in older homes. Ordering the wrong rough-in means the toilet either does not reach the wall or overhangs the flange.

How does EPA WaterSense certification affect my rebate eligibility?

Most utility rebate programs specifically require EPA WaterSense certification as a condition of eligibility. The certification label appears on product packaging and is searchable through the EPA's WaterSense product search tool. Without this certification, even a toilet that happens to use 1.28 GPF may not qualify for rebate programs. Always verify certification status on the EPA website before purchasing if you plan to submit a rebate claim.

Is the TOTO Drake II worth it compared to cheaper WaterSense toilets?

For most households, yes. The TOTO Drake II consistently earns a 1,000g MaP score (the maximum) and produces significantly fewer clogs and second-flush events than lower-priced 1.28 GPF models that score 350g to 600g MaP. The additional upfront cost of the Drake II over a budget WaterSense toilet is typically recovered within 2 to 4 years through avoided plumbing service calls and the absence of double-flushing water waste.

Does replacing my showerhead actually save meaningful amounts of water?

Yes. A WaterSense showerhead at 2.0 GPM saves 0.5 GPM compared to an older 2.5 GPM model. For a family of four averaging 8-minute daily showers, that is 5,840 gallons per year. Combined with hot water energy savings, the EPA estimates total annual savings of about $70 per household per year from a single WaterSense showerhead replacement -- one of the best payback ratios of any home water upgrade.

What is the fastest payback fixture in a water-efficient bathroom remodel?

Faucet aerators have the fastest payback period, typically under 2 years, because they cost $5 to $15 per faucet and can be installed without tools. However, total annual savings per aerator are modest (about $3 per year per faucet). A WaterSense showerhead at $25 to $150 usually pays back in 1 to 3 years with higher total savings. The toilet offers the largest total savings but has the longest payback period at 4 to 11 years depending on your existing model.

How old does a toilet need to be before replacing it saves money?

If your toilet uses 3.5 GPF or more (manufactured before 1994), replacing it is almost always financially justified, typically with a payback period of 4 to 8 years before rebates. If your toilet uses 1.6 GPF (manufactured 1994 to 2010) and flushes reliably, the upgrade to 1.28 GPF saves only about 10,000 fewer gallons per year for a family of four -- roughly $10 to $35 annually -- which extends the payback period considerably. Age 20-plus toilets with recurring mechanical issues are stronger replacement candidates regardless of GPF.

Can I install a high-efficiency toilet in a home with low water pressure?

Most gravity-fed WaterSense toilets require a minimum water pressure of 10 to 25 PSI to fill and function correctly, which is within the range of nearly all residential supply systems. Pressure-assist models like certain Gerber and American Standard units use a pressurized vessel inside the tank and actually perform better under moderate low-pressure conditions, though they can be louder. If your home consistently runs below 20 PSI, consult a plumber before selecting any flush type.

What is the Kohler Cimarron's water efficiency rating?

The Kohler Cimarron Comfort Height is available in both 1.28 GPF (Class Five flushing system) and 1.6 GPF versions. The 1.28 GPF version carries EPA WaterSense certification and earns a published MaP score of approximately 800 grams, placing it solidly in the good-performance tier. It is one of Kohler's most popular models for bathroom remodels due to the combination of familiar styling, ADA-compliant seat height, and verified water efficiency.

How does the Woodbridge T-0001 compare to the TOTO Drake for water efficiency?

Both models use 1.28 GPF and carry WaterSense certification. The TOTO Drake II typically scores higher on MaP testing (1,000g vs. 800g for the Woodbridge T-0001), indicating better solid waste removal in independent tests. The Woodbridge T-0001 offers a skirted one-piece design that is easier to clean and has stronger modern aesthetics, making it a preferred choice when remodel design is a priority alongside efficiency. TOTO remains the performance leader on flush reliability data.

Does a water-efficient toilet require any special maintenance?

No special maintenance is required beyond standard toilet upkeep. WaterSense-certified toilets use the same fill valves, flappers, and flush mechanisms as conventional toilets, though some premium models (TOTO's Double Cyclone, for example) use specialized flush valves that require brand-specific replacement parts. Cleaning frequency may actually decrease with glazed bowl surfaces like TOTO's CeFiONtect, which resists mineral buildup.

Are there any downsides to ultra-low-flow 1.0 GPF toilets?

At 1.0 GPF, some models sacrifice MaP score compared to 1.28 GPF models, meaning more variation in clearing performance between brands. The Niagara Stealth at 0.8 GPF, for instance, earns a 600g MaP score, which is acceptable but below the 800 to 1,000g scores of leading 1.28 GPF models. For homes on septic systems, the reduced flush volume can also mean less hydraulic push through the drain field, which some plumbers recommend monitoring. Households with long drain runs should verify adequate slope and pipe diameter before choosing sub-1.0 GPF models.

What should I look for when choosing a toilet for a small bathroom remodel?

For small bathrooms, prioritize compact elongated or round bowl models that offer shorter depth from wall to front of bowl. Many 1.28 GPF WaterSense-certified toilets are available in compact dimensions -- look for models with a front-to-back depth under 27 inches. Round bowl toilets save about 2 inches of depth over elongated bowls. The American Standard Cadet 3 and Swiss Madison Clarence both offer compact WaterSense versions suited to tight spaces.

How do I know if my current toilet is leaking water silently?

The dye test is the standard method: remove the tank lid, add 10 to 15 drops of food coloring to the tank, and wait 15 minutes without flushing. If color appears in the bowl, the flapper is leaking and wasting water continuously. An alternate method is to turn off all water in the home and read your water meter; if it advances after 30 minutes, a leak exists somewhere. A leaking flapper alone can waste 200 gallons per day -- more than a full toilet upgrade would save in a week.

Sources

  • EPA WaterSense, epa.gov/watersense
  • MaP flush testing, map-testing.com
  • Manufacturer published specifications
  • EPA WaterSense Residential Toilets Fact Sheet (epa.gov/watersense/residential-toilets)
  • EPA Showerheads WaterSense Data (epa.gov/watersense/showerheads)
  • Alliance for Water Efficiency, water-efficiency.net

Our Verdict

A water-efficient bathroom remodel anchored by a 1.28 GPF WaterSense-certified toilet -- specifically a TOTO Drake II, Kohler Cimarron, or American Standard Cadet 3 -- delivers 13,000 to 16,000 gallons in annual water savings for most households, with a clear payback period of 4 to 11 years through utility bill reductions alone. Add a WaterSense showerhead and aerator replacements to reach 23,000-plus gallons in total annual savings. Check your utility's rebate program first: in many jurisdictions, rebates of $50 to $200 per fixture compress that payback period to 2 to 5 years, making this one of the most financially defensible home improvement investments available.

Related Guides

How we rank & our data sources

We do not run physical lab tests. Rankings are built from published, verifiable data and real owner feedback, never paid placement.

Researched by Marcus Bell · Last updated June 28, 2026 · Our review method

M
Researched by Marcus Bell

Marcus compiles bathroom-fixture data, MaP flush scores, GPF ratings, trapway and flush-valve specs, and weighs them against thousands of verified owner reviews to build our rankings. He does not run physical lab tests; every verdict is sourced from published specifications, certifications (MaP, EPA WaterSense) and real owner feedback.

Updated June 2026 · Toilets
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