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What is a dual-flush toilet?

A dual-flush toilet offers a full flush for solid waste and a reduced flush for liquids. For WaterSense tank models, Version 1.2 measures the average of two reduced flushes and one full flush against a 1.28-gallon limit, so compare that rating with the individual flush settings.

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Identify the full-flush and reduced-flush controls with everyone in the household so each person knows when to use each mode. Source: U.S. Environmental Protection Agency, read 2026-11-03.
  2. At least once a year, add a couple drops of food coloring or a dye tablet to the tank and wait 10 minutes to check for silent leaks. Source: U.S. Environmental Protection Agency, read 2026-11-03.
  3. Flush after the dye test to avoid staining the inside of the tank. Source: U.S. Environmental Protection Agency, read 2026-11-03.
  4. Request the proposed tank and bowl model numbers in the written scope, with product documentation showing which counterpart components form the WaterSense labeled combination. Source: U.S. Environmental Protection Agency, read 2026-11-03.
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How are you supposed to use those toilets with the 2 sided buttons?

For a home with dual-flush controls, teach the household which setting to use before putting the new fixture into regular service. “Tank-type toilets are available as single-flush models or dual-flush models, which include a full flush for solids and a reduced flush for liquids.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “If your home has a dual-flush toilet, make sure everyone knows how and when to operate the full-flush mode versus the reduced-flush mode.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

How much water does it take to flush a toilet?

Read a tank model’s effective rating as a three-flush average, rather than assuming that each button releases 1.28 gallons. “The effective flush volume shall not exceed 1.28 gallons (4.8 liters) when evaluated in accordance with the sampling plan contained in 10 CFR 429.30.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “For dual-flush toilets, the effective flush volume is the average flush volume of two reduced flushes and one full flush.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “EPA has paused the effective date of Version 2.0 of the specification.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “Version 1.2 remains in effect until further notice.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

How do I know if my dual flush toilet is leaking?

Use the annual household test below to decide whether water is escaping from the tank into the bowl without a flush. “Check for silent leaks at least once a year by putting a couple drops of food coloring or a dye tablet into the tank at the back of the toilet and waiting 10 minutes.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “If the color shows up in the bowl, you have a leak that can probably be fixed by replacing the rubber flapper in the tank, which may be worn out.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

Can I convert my toilet to dual flush with a conversion kit?

For a tank-style home toilet, compare replacement with a proposed conversion using EPA’s facility-maintenance caution below as a question for the installer. In its May 2023 guidance for commercial and institutional facilities, EPA says: “In general, avoid retrofitting existing tank-type toilets with displacement dams or bags, early-closing toilet flappers, or valves with different flush volumes, as these devices could impede overall performance and require increased operation and maintenance.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “In addition, using these devices and other retrofit products could actually increase water consumption and void manufacturer warranties.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

Should you buy a dual-flush toilet?

For a replacement under WaterSense Specification 1.2, choose the controls after checking the label and the documented tank-and-bowl combination. “The specification is designed to ensure both sustainable, efficient water use and a high level of user satisfaction with flushing performance.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “If the toilet has dual-flush capabilities, it shall conform to requirements in ASME A112.19.14.” Source: U.S. Environmental Protection Agency, read 2026-11-03. “Product specification sheets or other product documentation for both the toilet tank and bowl must indicate all of the specific brand names, model names, and model numbers, as applicable, of the counterpart products (e.g., the bowl or tank) that the product can be used with to form a WaterSense labeled tank-type toilet.” Source: U.S. Environmental Protection Agency, read 2026-11-03.

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