It was a case of squeaky bum time when fans finally tore themselves away from the television earlier this week after a nail-biting first 45 minutes, with water use jumping 24 percent in Tokyo during the break, the city's waterworks bureau said on Friday.
"We presume it's because a lot of people holding off on a trip to the bathroom all went at once," an official told AFP.
"Water use can fluctuate, especially during football matches, which only have one break in the middle," she added.
"It also can be affected by a period of time, excitement and other factors."
Flushed with joy after watching Yuya Osako bag a second-half winner for Japan against 10-man Colombia in Russia on Tuesday, jubilant fans made another dash for the loo at the final whistle, causing another spike of 50 percent in water use.
But the official revealed the Tokyo waterworks bureau had anticipated the stampede and adjusted the city's supply and pressure accordingly in order to avoid catastrophe.
"We are ready to prepare for a stable water supply during the next match on Sunday," she insisted, looking ahead to this weekend's clash with Senegal.
A similar pattern of toilet use was noted across Japan as viewers remained glued to their screens for the match, broadcast live on prime time TV.
The viewing rate for the fixture also hit a yearly high of 48.7 percent in Japan, surpassing the 33.9 percent marked when Japanese figure skating hero Yuzuru Hanyu won Olympic gold in February.
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