The camera shows water sitting in one stretch of my line. Does that mean a belly?

Often. HomeGuide describes a belly as a sag in the pipe where water collects, and a camera is how plumbers find one. Ask for the footage marks where the water starts and ends and how deep it gets on the pipe wall. A short, shallow sag in good pipe may be a repair job; This Old House lists minor sagging among the problems a targeted repair can fix.

Can a liner or pipe bursting take the sag out without digging?

No. A cured-in-place liner is cured against the old pipe and takes its shape, so a lined belly is still a belly, and pipe bursting pulls new pipe along the path of the old one. Digging out only the sunken stretch keeps the trench short.

The low spot is right next to my foundation. Can they dig there?

Yes, with limits. The plumbing code says a trench running alongside a footing or wall can't reach into the footing's bearing plane, a line drawn down at 45 degrees from the bottom outside edge of the footing. Ask the plumber how deep the trench will go and how the pipe will be bedded at that end.

Sewer Line Belly Repair in Mobile, AL

Partial-replacement cost: HomeAdvisor's national guide gives partial sewer line replacement an average of $50 a foot and a range of $50 to $250 a foot; HomeGuide says partial repairs often cover 1 to 15 feet.
Timeline: re-laying a sagging stretch fits inside the 1-5 day window cost guides quote for sewer work (how long jobs run), and the city inspects the bedded pipe before backfill.
Code slope: a 4-inch building sewer needs at least 1/8 inch of fall per foot under the 2021 plumbing code Mobile adopted.
Method: cost guides say trenchless methods aren't suitable for a pipe with improper slope, so a belly is dug and re-laid.

Mobile Sewer Line Replacement matches your request about a sagging sewer line with a plumbing contractor. A belly is a low spot where the pipe has sunk below its grade and water collects; the repair is to dig out that stretch, rebuild the bed under it and re-lay the pipe at an even fall.

Sewer Line Belly Types and How Each One Is Repaired

The code asks for buried pipe to be supported along its whole length on a solid, continuous bed. A belly is a stretch that has dropped off that even support. How it is repaired depends on how long the dip is, where it sits and what is on top of it.

Sewer camera view inside a white PVC sewer pipe where gray water pools along a low stretch and rises partway up the pipe wall

Shallow Sag Holding Standing Water

A shallow belly shows on camera as water lying in one stretch after the line has drained. This Old House lists minor pipe sagging among the faults a targeted repair can handle when the rest of the pipe is sound. Ask for the footage at the start and end of the water so the dig can be kept to that length.

Long or Deep Belly

This Old House says targeted repairs suit problems that are small and localized. Where the sag is not, the sunken length comes out and goes back at the right fall. If the trench bottom is soft, the code requires digging at least two pipe diameters deeper and refilling with fine gravel, crushed stone or a concrete base before the pipe goes back.

Belly at the Foundation Exit

The code limits a trench dug alongside a footing or wall: it can't reach into the footing's bearing plane, which runs down at 45 degrees from the outside bottom edge of the footing. That can shape how the plumber reaches a sag tight against the house.

Narrow trench cut across a concrete driveway, exposing a sewer pipe being re-laid on a bed of fine gravel

Belly Under a Driveway or Walk

Concrete adds removal and repair to the job. HomeGuide puts concrete removal at $3 to $8 a square foot extra, and Bob Vila averages $1,750 for repairing a driveway after sewer work. A belly under concrete is still dug.

Bedding and Backfill for the Re-Laid Section

Pipe sinks where the ground under it settles. For new work the code wants backfill placed in 6-inch layers, tamped until 12 inches of earth cover the pipe, compacted under and beside it and brought up evenly on both sides so the pipe stays aligned. Pipe can't be propped on blocks to grade. Ask how the new section will be bedded and backfilled.

Gloved hands holding a sewer camera monitor showing a cracked clay pipe joint with roots, beside an open cleanout in a lawn

Why Mobile homeowners, landlords and businesses call Mobile Sewer Line Replacement

One licensed plumber gets the request, not a bidding list
No charge to you for the introduction
Ask to keep the camera video from before and after
Alabama plumbing licenses can be checked online

Sewer Line Slope Rules in Mobile's Plumbing Code

Mobile adopted the 2021 International Plumbing Code as its plumbing code. Table 704.1 sets the minimum fall for horizontal drain pipe by size:

2 1/2 inches or smaller
1/4 inch per foot.
3 to 6 inches
1/8 inch per foot.
8 inches or larger
1/16 inch per foot.

Mobile's own amendment sets 4 inches as the smallest building sewer, so a house lateral here falls in the 3- to 6-inch row: about 6 1/4 inches of drop over 50 feet and 12 1/2 inches over 100. Section 704.1 also requires drain pipe to be laid "in uniform alignment at uniform slopes", which is the rule a belly breaks.

Why Lining and Bursting Don't Fix a Belly

Cost guides group cured-in-place lining and pipe bursting with the trenchless methods they say aren't suitable for improper sloping, and point to excavation. Lining or bursting may still suit the rest of the run once the low stretch has been re-laid; compare cured-in-place lining and trenchless replacement.