A manufactured or mobile home has a drainage system unlike a site-built house: the drain lines hang beneath the floor in the crawlspace, run across or just under the ground to a connection point, and join a park sewer riser, a private lateral or a septic tank through fittings that were installed at setup and have often been modified since. The pipes are visible from underneath, which helps, and the camera covers the parts that are not.
Quick answer: inspect from the crawlspace first, looking at every hanger, joint and slope of the exposed ABS drain, then camera the line from the home’s drain outlet to the park riser or septic tank, and camera the riser or lateral beyond it as far as ownership allows. Check for freeze damage, sagging unsupported runs, improvised connections, a missing or failed trap at the riser, and crawlspace drainage that has washed out the pipe bedding. A small-head camera is the right tool for the 3 in lines.
What is underneath
Manufactured homes are plumbed in the factory with ABS or PVC drain lines that terminate at one or two outlets under the floor. At setup, the installer connects those outlets to the site’s sewer with pipe laid on or just under the ground to a riser, and that connection is the most common point of failure. Over years, skirting is removed and replaced, pipes are bumped, hangers fail and freeze protection is forgotten.
The crawlspace inspection
With a light and a mirror, look at every run of exposed drain: hangers every four feet or so, continuous fall toward the outlet, no sags between supports, intact joints, no staining below them. Look for heat tape and insulation on exposed runs in cold climates and for signs of past freezing. Look at where the drain passes through the belly wrap. This is the part the camera does not need to do, and it is the part most inspections skip.
Camera from the outlet
From the home’s drain outlet, or from a cleanout the installer should have provided, push the camera toward the connection. The exposed and buried run to the riser is where sags, crushed sections and separated joints hide under skirting and soil. A 3 in line wants a small head; small-diameter drain cameras and the sewer vs drain camera distinction explain the equipment.
The connection
At the park riser or the private lateral the home’s line joins through a fitting that may be a proper wye, a rubber coupling, a flexible connector or a hose clamped over a pipe. The camera sees the inside of that joint and whether it is open, offset or collecting debris. Where the riser has a trap, check it holds water and is not cracked. An improvised connection is a repair item and often a park rule violation.
Beyond the connection
In a park, the riser joins a park-owned sewer and the resident’s responsibility usually ends at the riser or the property line; ask the park for its rules in writing. On private land the lateral or septic line continues and is the owner’s. Camera as far as ownership allows and ask the park about its own maintenance and backup history. Septic line inspection applies where the home is on septic.
Freeze damage
Exposed drain lines in cold climates split when standing water freezes, often at a sag or a trap. The camera shows a split as a crack with daylight or soil behind it. Check heat tape is present and powered where the climate requires it.
Crawlspace water
Poor site drainage runs water under the home, washes out the bedding under the buried run and leaves pipe hanging or sagging. Standing water in the crawlspace is a drainage finding and a pipe finding at once.
Additions and modifications
A room addition, a second bathroom or a washing machine added after setup usually came with new drain connections made by whoever was available. Follow each fixture’s drain to where it joins the original system and camera the joint.
Who inspects
A home inspector experienced with manufactured housing for the crawlspace and setup, and a drain camera operator for the lines. Many manufactured-home inspectors carry a small camera. For a park home, ask the park what records it keeps of the riser and the park sewer.
What to record
Photographs of the exposed runs with any defects marked. Footage from the outlet to the connection with distances. The connection type and condition. The park’s written responsibility boundary. Any freeze protection present. This is the file for a home whose drains are more exposed to the elements and to improvisation than any other.
Park responsibilities in practice
Park rules usually say the resident owns everything from the home to the riser and the park owns the riser and beyond, but the riser itself is where disputes happen: a cracked riser, a missing trap or a connection the previous resident improvised sits exactly on the boundary. Photograph the connection at purchase, get the park’s written confirmation of where its responsibility starts, and ask whether the park inspects its sewer and when it last did. A park with a history of backups in several homes has a park sewer problem that no amount of work under one home will fix.
Common questions
Can a regular sewer camera inspect a mobile home drain?
A 23 mm head will pass 3 in ABS, but a smaller head and a flexible rod are easier through the fittings. A dedicated drain camera suits the job.
Who is responsible for the sewer under a mobile home in a park?
Usually the resident to the riser or property line, the park beyond. Get the park’s rule in writing.
What is the most common finding?
A sagging or separated run between the home’s outlet and the riser, and an improvised connection at the riser.
Related guides
See crawlspace drain inspection points, a 50 ft drain camera suited to short runs, and counters vs cable markings.