Building merchants group Wolsely was flushing away £2,249 a year because of faulty controls in the gents’ urinals at one of its offices.
That’s according to leakage engineers at H2O Building Services which flagged up the problem behind the extra water and wastewater charges.
They worked out the site in Chelmsford’s average daily use (ADU) of water had increased beyond the benchmark figure for staff levels.
The waste totted up to 2.17m3 (cubic metres) per day or 174,240 gallons a year.
A family of three uses around 134m3 per year or 29,480 gallons – meaning the water leak was enough water for five households per year, said the building services firm.