Cluster at two shower flow ratings
11,305 of 17,993 showerhead identities report 1.75 or 1.8 GPM. Pressure and comfort still require separate evidence.
See the full distribution →INDEPENDENT WATER RESEARCH
Make sense of your everyday water use.
Understand fixture ratings. Compare your routines. Make a more informed choice for your bathroom.
Compare Water UseTransparent calculations. Source-based research. No product rankings.
How much water in an
8-minute shower?
14.4 gal1.8 GPM
16 gal2.0 GPM
1.6 gallons apart. Same time. Different assumed flow.
Flow × minutes. An illustrative estimate, not measured shower performance.
EXPLORE THE RESEARCH
One bathroom. Three different questions.
01 / SHOWERHEADSWhat does a flow rating
A faucet and an accessory
Two flush modes need
What does a flow rating
really tell you?
Compare recorded GPM values and separate the product rating from time spent showering.
Explore shower flow 02 / BATHROOM FAUCETSA faucet and an accessory
are not the same choice.
Read flow values alongside product type, and know what they cannot tell you about fit.
Explore faucet flow 03 / TOILETSTwo flush modes need
two separate numbers.
Understand full and reduced flush volumes before estimating a daily total.
Explore flush volumesA CLOSER LOOK AT THE DATA
Patterns worth understanding.
Accepted product identities in the EPA directory snapshot saved October 30, 2026. These are catalog counts, not sales shares.
Are listed as complete faucets
19,089 of 21,063 identities are faucets; the other 1,974 are accessories. Identical flow does not establish compatibility.
Understand the product types →Single / dual flush identities
In 6,591 toilet records, a dual-flush pair stays two values. The reduced rating cannot stand in for every flush.
Read the mode-aware analysis →PUT THE NUMBERS TO WORK
Your routine changes
the answer.
Compare two shower and toilet scenarios. See daily, 7-day and 30-day water use, with every input and calculation explained.
Compare Water Use →Showers and toilet flushes only—not a whole-home estimate or a water bill forecast.
BUILT ON EXPLICIT ASSUMPTIONS
Useful research also tells you
what it cannot answer.
A flow rating describes water per minute; a flush rating describes water per use. Neither becomes a household total without duration and frequency.
We analyze 45,647 accepted identities across three categories. Model names can repeat. Historical records do not prove current certification or availability, and cannot establish installation compatibility.