Home Toilet water flow rate: GPF, GPH, GPM, and EPA standard

Toilet water flow rate: GPF, GPH, GPM, and EPA standard

In context, in the modern world, the trials with a GPF of 1.28 are considered an EPA (Environmental Protection Agency) standard GPF and are also certified by the WaterSense technology certification. Another category of modern toilets uses more or less 1.6 GPF of water which is banned in many regions for using too much water in a single flush.

What is the toilet water flow rate?

Toilet water flow rate is the quantity of water that flows through the water supply line or hose to a toilet. This is measured to identify the toilet’s water pressure and efficiency. But a higher water flow rate causes an overflowing issue, and a decreased water flow rate may disable the toilet’s flushing mechanism. 

What is GPF? 

The GPF is one of the main units that defines how much water has been flushed in each flush. This is the most effective unit to evaluate the water quality a toilet uses in every flush. The GPF has the full form of “Gallons per flush.” In a world where the quantity of water is shortage. The research found that Americans use more than 30% of water to flush the toilet daily. 

What is GPH? 

GPH is similar to the GPF and GPM; the only difference is their measurement unit. The elaborate version of GPH is “Gallons per Hour.” In simple words, the GPH is the unit of measurement of how much water is flown or the rate of flowing water in the toilet in one hour. The water flow rate in a WaterSense running toilet is approximately 120 to 200 GPH per hour.  

What is GPM? 

The full meaning of the GPM is “Gallons per minute,” and it was used at an early age in the toilet as there was no alternative to the GPM at that time. It is similar to the GPF(Gallons per flush), and the GPM suggests how much water is flown in a running toilet per minute inclusive. The gallons per minute unit is used in those areas where the measurement is to be cunted in a more substantive perspective, like in the large bathroom settings in the industrial and commercial areas. The standard measurement of the GPM of the toilet is 2-3 gallons per minute, and it meets the consecutive requirements of the EPA and HET(High-Efficiency toilet). 

Which brand manufactures Watersense toilets?

Popular brands like Toto, Kohler, American Standard, and Gerber are Watersense and EPA standard toilets that meet the preconditions of consuming less GPF or GPM of water.

How to determine the flow rate of my toilet?

The flow rate of the toilet is a significant consideration for the maximum water supply through the pipeline. To determine the flow of the toilet, you need to divide the particular amount of water by the time it needs to fill up the entire bucket. Suppose you have a 20-liter capacity bucket in your hand, and it takes 2 minutes to fill the bucket through the water supply hose of the toilet. Then you need to divide the amount of water by the time it takes to fill the bucket. So the flow rate of the toilet is (20/2= 10 liters per minute) or 2.65 gallons per minute. If we simplify it, your toilet’s water supply line supplies 2.65 gallons of water per minute to the toilet.  

How do you decrease the toilet water flow rate?

To save some bills, you must minimize the toilet water flow rate. There are lots of proven tricks for doing so, and those are depicted below, 

  • Change the flapper valve.

The flapper valve is the part that is responsible for allowing water into the tank. Inspect the flapper for signs of wear and tear and if so, then change the flapper valve if it is damaged because a damaged flapper can cause a great loss of water through the water bowl.Replace the flapper valve

  • Check the water level of the tank. 

If the tank is filled with too much water, there is a chance of overflowing and losing water. The toilet will use more water if the tank is full to its brim. For the earlier toilets, the water level was monitored by a float ball. As the float ball rises, the rod shuts off the fill valve. In modern toilets, a sensor is used to identify the water level.  Check the Toilet water level of the tank

Modern technologies are about maintaining an excellent class of postures and saving nature’s most precious elements. The low-flow or high-efficiency toilets are most suitable for this generation because they use only 1.28 gallons of water per flush, saving a huge quantity of water accumulated yearly.low-flow-toilet

  • Implement a Fill Cycle Diverter

The toilet tank and bowl are filled at different rates of flow. The fill valve continuously fills the tank until it has been filled, and it passes water into the bowl whenever we flush the toilet. So you need to install a fill cycle diverter so that it can resist the flow of water into the tank. It’s a tiny piece that attaches the fill line and overflow tube. Its architecture in a way that it can divert water back to the tank. When the bowl is full, it cuts down the supply of water. In this manner, water is saved in a large entity.Fill Cycle Diverter

What is the EPA standard?

The elaborate form of EPA is the Emission standards of the “Environmental Protection Agency.” It works to protect human and environmental health. EPA imposes some guidelines on several products to ensure they maintain a standard to produce the product. They provide some regulations for the manufacturers to avoid using harmful materials in their products, and they also impose a set of legislatures on the companies. The toilets must maintain the EPA standards while manufacturing the products. The WaterSense technology, the HET toilets, Ultra max-glaze toilers, standard height toilets, and eco-friendly toilets are some protocols the EPA imposes on producing standard toilets. These products are also valued as advantageous for human health.

Hi, this is Robert Crossan, the owner of this website, has 17 years of experience in the installation, maintenance, and repair of toilets and plumbing systems. After completing the Level 2 Basic Plumbing course in 2005, I started working in both domestic and commercial buildings as a professional plumber. So I can figure out the core difference between different toilet models and brands. It also helped me monitor their work performance and setbacks.


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