A slow drain behaves the same whether your waste goes to a municipal main or to a tank in your garden. What happens next is entirely different — different equipment, different costs, and one approach that will damage the other system. Establishing which you have is the first question, not a detail.
Need this looked at?
Tell us your town or ZIP code and what is happening. We route the call to an independent contractor covering that area.
Call (888) 855-8790
How a contractor actually diagnoses it
- They ask whether you receive a sewer bill from the municipality. That single question settles it most of the time.
- They look for a tank lid or inspection covers in the garden, usually ten to twenty-five feet from the house.
- They check the line leaving the property. A lateral heading to the street is sewer; one stopping short in the garden is septic.
- On septic, they check tank levels before touching any drain — a full tank presents exactly like a blocked line.
Three ways this actually fails
A full or overdue septic tank
Presents as every drain in the house slowing at once. Cabling the line achieves nothing; the tank needs pumping.
A failed drain field
Water backs up because it has nowhere to soak away. Symptoms include soggy or unusually green ground over the field. This is the expensive failure.
A blocked lateral, on either system
The one failure common to both, and the only one where cabling is the right first move.
Signs this is urgent rather than annoying
- Every drain in the property slow at the same time
- Soggy ground or unusually lush grass over the tank or field
- Sewage smell outside near the tank
- Backups that started shortly after heavy rain, on septic
What it costs
Published third-party ranges shown so you can sanity-check a quote. Not our prices, not an estimate, not a quote.
| Job | Published national range | Source |
|---|---|---|
| Septic tank pumping | varies widely by tank size and region | industry practice |
| Drain field repair | $1,600–$6,600 typical range reported | Angi |
| Main line clearing | $175–$800 | HomeGuide |
Published national ranges, shown for educational context only. These are not quotes and they are not our prices. Sources disagree with each other — that spread is real. Only the contractor who sees your line can price your job.
Full cost guide, by fixture and by method →
Questions people ask
How do I find septic vs sewer near me?
Call the number on this page and give us your town or ZIP code. We match it against partner coverage and connect you with an independent licensed contractor who works that area. We do not charge you anything — the contractor sets their own price.
How do I know which I have?
If you pay a sewer charge on your water bill, you are on the municipal system. If you do not, and there are inspection lids in the garden, you are on septic. Your county health department holds records for most septic properties.
Does it change what I should do?
Considerably. On septic, chemical drain cleaners can damage the bacterial balance the tank depends on, and repeated use genuinely shortens the system's life.
How often should a tank be pumped?
Typically every three to five years for a household tank, though it depends on tank size and occupancy. Overdue pumping is the single most common cause of septic backups.
Everything is slow at once. Is that the tank?
On septic, that is the first thing to check — and it is checked by looking in the tank, not by cabling the line. Cabling a line that backs up because the tank is full accomplishes nothing.
What is a drain field?
The buried area where liquid from the tank soaks away into the ground. When it fails, water has nowhere to go, and it is the most expensive part of a septic system to replace.
Can I put a garbage disposal on septic?
You can, and many do, but it increases solids loading significantly and shortens the interval between pump-outs. Worth knowing before fitting one.
Do you route septic calls?
We route drain and sewer calls to contractors covering your ZIP code. Tell us it is septic when you call so we can route it to someone who handles that.