Build a fixture inventory and measured water-use baseline before replacing commercial restroom equipment. Record installed models, flush or flow ratings, actual leaks, operating hours and the area each meter serves. Compare equivalent periods after changes. Ratings estimate use per operation; they do not establish occupancy, total consumption or a guaranteed payback for the building.
What belongs in the fixture inventory?
Record the installed equipment, not only the purchase specification:
| Item | Useful field record |
|---|---|
| Toilets and urinals | Model, bowl and valve combination, rated flush volume and observed faults |
| Faucets | Model, outlet rating, controls and any continuous flow |
| Sensor controls | Operation, repeated cycling or failure to stop |
| Operating context | Open hours, known closures and changes in occupancy |
| Water measurement | Meter identity, units, reading interval and downstream loads |
Photograph labels and note missing information. A flush valve and bowl need to be evaluated as their actual combination. Flushometer versus tank toilets explains the supply and configuration differences. A running Sloan flushometer can change the baseline before any upgrade occurs.
How can you isolate restroom consumption?
Check whether a dedicated submeter serves that restroom alone. If the meter also covers irrigation, cleaning or another tenant, label the data accordingly. A whole-building total does not become restroom use merely because the busiest fixtures are there.
Use the commercial submeter map to establish the boundary. Where direct measurement is unavailable, keep any estimate's assumptions visible: fixture ratings, estimated use counts and included loads. Do not present that estimate as measured consumption.
What should be compared after work?
Compare periods with similar operating hours and activity, and document other changes. Record repairs performed alongside replacement, including leaks and control adjustments. Closed-building water use can help identify an ongoing load outside normal restroom demand.
The same period check belongs in a commercial water-bill comparison when a utility total is used to judge the project.
Verify the completed fixtures remain usable and meet the applicable layout and operating requirements. Waterless versus flush urinals addresses maintenance and configuration decisions beyond volume. Replacing accessible fixtures addresses changes in clearances and controls.
Put the baseline, installation records and followup readings into the project file. EPA's planning approach supports checking actual performance over time. It does not guarantee a specific water saving or financial return from the model selected.