Household · official-source review · reviewed 2026-10-10
A fixture swap sounds small until you multiply it by every shower in a year.
Turn two flow rates and a shower habit into gallons saved each year and the money those gallons carry.
Households deciding whether a low-flow fixture is worth the swap.
Use the source document or official route that applies to your situation. This guide does not contact another person or verify external information.
Read the gallons per minute on the old fixture and the new one. The label usually carries it.
Time a normal shower in minutes. Use a typical one, not the shortest.
Count the showers your household takes in a week.
Subtract the new rate from the old, multiply by the minutes, then by the weekly showers.
Multiply the weekly gallons by 52, then divide by 1,000 and multiply by your rate per thousand gallons.
You move from 2.5 to 1.75 gallons a minute over 8-minute showers, seven times a week, at $3.50 per thousand gallons. That is 2,184 gallons and $7.64 a year.
Use your own source and details. The example is not a record about a real person or organization.
U.S. Environmental Protection Agency, WaterSense · reviewed 2026-10-10
What this source supports: WaterSense publishes water-efficiency guidance and fixture specifications for homes and workplaces.
Source limit: Household water rates and fixture models differ. Use your own utility bill and fixture documentation.
These sources support the statements above. They do not show that every person needs this guide. They do not show a specific result.
This guide multiplies your own flow rates and habits. It does not measure your fixtures or read your water bill.
Household water rates and fixture models differ. Use your own utility bill and fixture documentation.
Use current instructions from the responsible organization. This guide is a planning aid, not an official decision or a substitute for qualified advice.
Turn two flow rates and a shower habit into gallons saved each year and the money those gallons carry.
This App multiplies the numbers you enter. It does not measure your fixtures, verify a label, or read your water bill.
You enter every number yourself. The sources support the method and the limits. They do not produce a result for your specific case. Keep the original documents next to the sheet you build.
The App computes the worked example with your own numbers, in your browser.
APP 1
Turn two flow rates and a shower habit into gallons saved each year and the money those gallons carry.
Free · no account · no upload
Open Low-Flow Fixture Annual Water SavingsThe App runs in this browser. It does not send or save entries. Copy, download, or print only when you choose.
This guide uses short, direct instructions as an ASD-STE100-style writing target. It is not a formal certification.
Companion App: Low-Flow Fixture Annual Water Savings. It runs in this browser and does not upload your entries.
This guide is edited for clarity and checked against the sources it links. It is not a substitute for official instructions or qualified advice. A linked source does not show that every person needs this guide.