Calculate Your Legionella Flushing Schedule — Free Calculator for UK Buildings
Enter your building details and outlet count to get a recommended weekly flushing schedule with HSG274-informed run times and a downloadable checklist.
HSG274 Part 2 requires any water outlet unused for seven or more consecutive days to be flushed before the next use. For buildings with regularly underused outlets, a weekly flushing schedule prevents stagnant water from becoming a legionella risk.
Enter your building details below to get a recommended flushing schedule with run times informed by HSG274 guidance, plus a downloadable weekly checklist for recording compliance.
This tool generates a draft schedule based on common assumptions for your building type. Treat the output as a starting point — review it against your actual risk assessment and adjust timings and frequencies to match your site-specific conditions.