Describe which fixtures are affected and how their use relates. Clearing and inspection answer different questions; a restored flow does not prove the line is undamaged.
Map the observed sequence
Write down whether the sink, shower or toilet was in use when water moved elsewhere. Include a washing-machine discharge if relevant. Do not deliberately recreate an overflow to gather evidence. The relationship between observations can help an assessor choose an access point and tests.
Disclose earlier remedies
Share earlier clearing work, available footage and any drain products used. Keep product details available for the visiting professional. Do not combine cleaners or continue using a fixture that worsens a backup. Sewage and contaminated materials require appropriate precautions.
Ask what each proposed task will establish
Clearing aims to restore flow. Inspection may provide evidence about line condition, location or a recurring issue, subject to access and equipment limits. Ask what footage or written findings you will receive, and what would justify a repair beyond another clearing visit.
Check the responsibility boundary
For an outside line, identify the sewer provider from the current bill and confirm the private/public boundary directly. A Denver-area locality label does not decide that boundary. Discuss permits, excavation, restoration and post-work testing separately if the proposal becomes a line repair.
Match the next task to the unanswered question
Flow is impaired, cause unconfirmed
Discuss clearing access, the visit charge and flow testing. Do not treat the symptom as a confirmed pipe defect.
A problem returns after clearing
Bring prior findings. Ask what inspection could establish and what limits remain.
Repair or replacement is proposed
Request the locating evidence, condition findings, restoration exclusions and testing before choosing a scope.
Take the next step for this problem
Clogged drains & plumbing backups in Denver ↗
For address-specific utility and access context, visit Denver or your locality guide. Confirm the answering business’s availability and any assessment charge.
Related homeowner guidance
Official resources
Resources provide general preparation and official contacts. They do not establish provider coverage or endorsement.