Toilet Not Fully Flushing – Plumbing Q & A ©Depositphotos.com/loskutnikov Question- “My toilet this morning will only flush 75% down. I’ve checked tank level, plunged 3 times, checked vent and there are no blockages. HELP!” Answer– In our opinion, we would auger the toilet to make sure there is nothing lodged in it. Ask the Plumber2018-03-05T18:10:30+00:00