Notice the signs
Observe
Observe the standing level without adding water, note the last known flush, nearby tub or sink reaction, another toilet's behavior, recent objects, recurring history, and whether the base becomes wet.
Note 29
Place the condition before choosing the work
Protect the room
Safety line
Do not keep flushing a rising bowl or combine chemicals with mechanical clearing. Stop using connected fixtures when another opening responds, and keep people away from overflow water.
Material note
Local boundary
One toilet usually indicates a local path, while interaction with the lowest fixtures can widen the investigation. Sewer district or on-site system status matters only after the private fixture evidence is placed.
Service flow
Written scope
A clear proposal states whether the fixture stays in place, what tool and access are used, removal and resetting terms, flange allowance, object retrieval, disposal, camera trigger, and downstream exclusions.
Close the loop
Verification
Several controlled flushes with ordinary paper, dry base inspection, stable bowl, complete refill, and quiet nearby drains provide better closure evidence than one empty bowl.
Current primary source