Introduction
A commercial dual flush toilet specification should distinguish model performance, local installation requirements and project water-use calculations. This guide explains the records and assumptions to review; it does not establish a universal code threshold or a guaranteed payback.
Confirm the current certification version and local requirements for the selected fixture. Any arithmetic example below is illustrative, not measured performance of a 9CREAT model.
Key takeaways
- Check the current EPA specification: Version 1.2 remains in effect while the effective date of Version 2.0 is paused. The proposed v2.0 full-flush threshold is not itself a universal building-code rule.
- Use the applicable project’s LEED version and approved calculation method. A 1.6 gpf baseline used in an example does not determine every project’s requirements.
- ROI improves where usage is high, water/sewer costs are elevated, and rebates offset first cost; commissioning and user adoption are critical to realize modeled savings.
Codes and certifications
WaterSense v2.0 update (dual-flush rule)
EPA finalized Version 2.0 for tank-type toilets in May 2024, shifting how dual-flush models are treated. Instead of relying on an effective average, the v2.0 approach expects the full-flush mode of dual-flush toilets to meet the same maximum as single-flush models (≤1.28 gpf). EPA subsequently paused the effective date to conduct additional review; Version 1.2 remains in effect until a new date is set. For details, see the agency’s own documents: the Summary of Revisions and Partner Guidance under the WaterSense tank-type specification.
- According to the EPA’s Summary of Revisions (May 2024), full-flush on dual-flush models is expected to be ≤1.28 gpf under v2.0 intent: EPA WaterSense v2.0 summary of revisions (2024).
- EPA also issued partner transition guidance and later paused the effective date; until further notice, v1.2 governs listings: EPA WaterSense partner guidance and status.
Project Water-Use Modeling
Confirm the approved baseline, fixture scope and calculation method with the project team and current certification guidance. A weighted average can illustrate a dual-flush scenario, but assumed usage shares must not be presented as measured project data.
See USGBC’s LEED v4.1 Water Efficiency overview for program context; use the applicable reference documents for the actual project.
Existing building case studies such as LADWP’s multifamily toilet retrofit case studies are not guarantees of the same savings in another building.
- Historical training reference, not a substitute for the current project method: Port Authority of NY & NJ LEED training reference (2021).pdf).
Illustrative weighted average: Average_gpf = Reduced_gpf × Reduced_share + Full_gpf × Full_share. Shares must sum to 1.
Office example only: 1.0 gpf at 65% and 1.28 gpf at 35% gives 1.10 gpf when rounded . This is a hypothetical usage split, not a measured commercial benchmark.
Hotel example only: 1.0 gpf at 50% and 1.28 gpf at 50% gives 1.14 gpf.
Spreadsheet terms: Reduced volume ×reduced share + Full volume ×full share.
Use actual project data or clearly documented assumptions. A historical source such as Port Authority dual‑flush calculator guidance does not establish a universal usage split.
Local Requirements and Jurisdiction
Confirm the applicable code edition, local amendments, product listing and acceptance requirements with the project designer and authority. Do not treat a WaterSense criterion or a threshold used by one state as the rule in most jurisdictions.
- Jurisdiction-specific example; confirm its current edition and applicability: Washington Administrative Code 51-56 (official).
Illustration of example thresholds and modeling inputs; verify current program and jurisdiction requirements separately.
ROI and rebates for water-saving dual flush toilets
Savings math inputs and assumptions
Use the actual existing fixture rate and proposed model’s documented volumes. Compare low, expected and high usage cases rather than assume every project begins at 1.6 gpf or achieves an average near 1.1 gpf.
- Office usage: use occupancy and measured or documented assumptions. General estimation guidance includes EPA WaterSense at Work — Toilets (2023).
- Hotel usage: use occupied-room and operating data. A case study such as EPA Holiday Inn San Antonio case summary (2017)is context, not a transferable fixture performance guarantee.
- When inputs are unknown, label them as assumptions. Use the project’s actual water and sewer tariffs instead of an unverified nationwide default band.
Document all input ranges (occupancy, usage, flush rates, tariffs) in your calculator and present low/median/high results.
Utility rebates and documentation
Utility incentives can materially shorten payback when available. Program terms vary, but commercial packages usually ask for receipts/invoices, qualification proof (e.g., WaterSense listing), account verification, and sometimes pre-authorization or inspections for multifamily/commercial projects.
- Business UHE toilet rebates with explicit documentation steps: Colorado Springs Utilities — Business Toilet Rebate (application PDF).
- Regional multifamily programs and assessments (Seattle-area consortium): Saving Water Partnership — Multifamily water use assessment and toilet rebate context (2024).
Tip: Track deadlines and pre-approval requirements. Always pull the latest form before submittal.
Payback drivers and ranges
Payback depends on usage, local water and sewer charges, installed cost, maintenance and any confirmed rebate. No universal tariff range or guaranteed recovery period is established here.
- For rate context and variability, see utility documentation such as Pennsylvania American Water rate schedules.
Scenario illustration only; validate the baseline, usage, rates and costs for the actual project.
Specs and submittals
Selection criteria for commercial duty
When you choose dual-flush fixtures for commercial duty, confirm both compliance and durability attributes.
- Applicable requirements: identify the code, product standard and any required listing for the selected fixture.
- Performance evidence: verify the model’s full and reduced volumes, test methods and any relevant independent results.
- Durability/maintenance: Commercial-grade valves, robust actuator plates, vandal resistance, readily available service parts.
- Accessibility: review the complete installation against the project’s applicable requirements, not bowl height alone.
- Interoperability: Adequate supply pressure; drain line carry considerations; compatibility with janitorial practices.
- Design intent: Coordinate with interior standards for Class A offices and hotels; for ideas, browse project inspiration from 9CREAT for commercial bathroom design cues.
Submittal package essentials
A clean, verifiable submittal reduces review cycles and change-order risk.
- Product data: Flush volumes for both modes, certification/listing references, dimensional drawings, and installation instructions.
- Compliance evidence: identify the applicable specification version, product listing and required local approvals.
- Project calculations: attach the approved baseline, fixture counts, usage assumptions and applicable calculation method.
- Warranty and O&M: Replacement parts list, cleaning guidance, maintenance intervals.
- Commissioning plan: Pre-functional checks, actuator labeling, occupant signage, and early monitoring steps.
For model-specific OEM documentation enquiries, contact 9CREAT . This is the publisher’s own brand, not a neutral third-party certification example. Ask which documents are available for the selected product; no universal WaterSense or U.S.-code readiness is established here.
Commissioning and user adoption
Dual-flush savings depend on correct use and upkeep.
- Interface clarity: Use distinct icons/colors for reduced vs full flush and keep the interface consistent across restrooms.
- Signage and onboarding: Simple, durable placards for public areas; brief training for facility staff on valve settings and checks.
- Early inspections: Verify seal integrity and flush volumes after turnover; adjust if users report misflush or incomplete clears.
- Feedback loop: Encourage custodial feedback and track water bills to confirm modeled savings hold over time.
Conclusion
- Compliance takeaway: distinguish the current certification criteria from local building requirements and verify the exact model’s documents.
- ROI takeaway: document the project baseline, actual tariffs, costs and usage; rebates and savings are conditional, not guaranteed.
- Final checklist: Verified flush volumes and listings, LEED calculator output with assumptions, organized submittal documents, commissioning/user signage plan, and a monitoring step to validate savings.
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