Daily gallons by toilet, shower, faucet, laundry, leaks and lawn, using EPA WaterSense flow rates
Updated October 2026
Each fixture is its flow rate times how much you use it. Default household: 4 people. Toilets: 4 × 5 flushes × 1.6 gallons = 32. Showers: 4 × 8 minutes × 2.5 gpm = 80. Faucets: 4 × 8 minutes × 2.2 gpm = 70.4. Laundry: 8 loads × 20 gallons ÷ 7 = 22.9. Leaks: 26 (EPA’s average of 180 gallons a week). Indoor total: 231 gallons. Outdoor: 650 gallons a week ÷ 7 = 93. Total: about 324 gallons a day, 71% indoors.
| Fixture | Standard | WaterSense label | Older fixtures |
|---|---|---|---|
| Toilet (gallons per flush) | 1.6 | 1.28 or less | Up to 6 |
| Showerhead (gallons per minute) | 2.5 | 2.0 or less | Often higher |
| Bathroom faucet (gallons per minute) | 2.2 | 1.5 or less | Often higher |
EPA WaterSense reports that toilets use nearly 30% of an average home’s indoor water and showers nearly 17%. A household’s own split depends heavily on habits, which is why the calculator asks for them.
Check the gallons-per-flush stamp on the toilet bowl behind the seat or inside the tank, and the gpm marking on the showerhead. Time a typical shower. For the washer, the spec sheet or ENERGY STAR listing gives gallons per load. For leaks, do a toilet dye test (food coloring in the tank; color in the bowl after 10 minutes without flushing means a leak) and read the meter during a two-hour period when no water is used. For outdoor use, multiply sprinkler run time by its gallons per minute, or compare summer and winter bills. Your rate is on your bill, often as dollars per 1,000 gallons or per hundred cubic feet (1 ccf = 748 gallons).
| Household | Indoor gal/day | Outdoor gal/day | Total gal/day | Gallons a year |
|---|---|---|---|---|
| Family of 4, standard fixtures, summer lawn (default) | 231 | 93 | 324 | 118,302 |
| Same family, WaterSense toilet, showerhead and faucets | 186 | 93 | 279 | 101,950 |
| Family of 4 with older 6-gallon toilets | 319 | 93 | 412 | 150,422 |
| Couple, WaterSense fixtures, no lawn | 106 | 0 | 106 | 38,773 |
| Family of 4, leak fixed and lawn watering halved | 205 | 46 | 252 | 91,865 |
Switching the default family to WaterSense toilet, showerhead and faucets saves about 16,352 gallons a year with the same habits. Older 6-gallon toilets add more than 85 gallons a day for a family of four.
EPA estimates the average family loses 180 gallons a week, 9,400 a year, to household leaks, most often running toilets, dripping faucets and leaking valves. Outdoors, as much as half of the water used is lost to wind, evaporation and runoff, and in dry Western states landscape irrigation pushes household use far above the national average.
Multiply monthly gallons by your rate per 1,000 gallons. Many utilities charge tiered rates, fixed monthly fees and sewer charges based on winter water use, so the calculator’s figure covers the usage part only.
It leaves out dishwashers, baths, pools, evaporative coolers and water softener regeneration; add their gallons to outdoor or leak use if they matter for you. It assumes the same use every day and ignores tiered pricing and fixed charges. Your water meter or utility’s usage portal is the real measurement.
Ignoring silent toilet leaks, which can waste far more than a dripping faucet. Using the shower’s labeled flow when an old showerhead runs higher. Comparing with a winter bill to judge summer use. Confusing ccf with gallons on the bill.