Clogged Drain Symptom Diagnostic
The difference between a fixture clog and a main line failure is a factor of three in price and the difference between "book it next week" and "stop using water now". Six questions tell them apart.
Plumbers diagnose this by pattern, not by looking down the drain. Which fixtures fail, whether they fail together, and whether the problem recurs are the three signals that matter — and you already have all three.
This tool applies the same reasoning a competent technician uses on the phone. It will also tell you when the answer is "nobody needs to attend yet", because a slow bathroom sink genuinely is a DIY job most of the time.
Frequently asked questions
What is the difference between a fixture clog and a main line clog?
A fixture clog affects one drain while everything else runs normally — the blockage is within a few feet of that fixture. A main line clog affects multiple fixtures together and follows gravity: flush a toilet upstairs and a downstairs shower gurgles or fills. Main line symptoms mean you should stop running water immediately, because every gallon has to surface somewhere.
Why does my toilet gurgle when the washing machine drains?
That is air being displaced past a partial blockage downstream of where both lines join, which makes it a main line symptom rather than a toilet problem. It is an early warning: the line is narrowing but has not closed yet. Addressing it now is a routine appointment; waiting usually means an emergency call.
My drain is slow but nothing is backing up. Is that urgent?
No. A single slow fixture with everything else draining normally can wait for a scheduled appointment, and often responds to a plunger or a hand auger. What is urgent is sewage entering the building, several fixtures failing together, or water rising in a tub when you flush.
Could my problem be the septic system rather than the sewer?
If you are on septic, yes, and from inside the house they look identical. Drain-field saturation during a wet Oregon winter produces exactly the same slow drains and low-fixture backups as a main line clog. The fix and the cost are completely different, so establishing which system you have is the first step, not an afterthought.