Most plumbing in a mobile home runs where you never look: under the floor, inside the belly of the home, behind the bottom board. A slow drip there can go on for months before it shows up as a soft floor, a musty smell or a water bill that does not make sense. This page covers where mobile home plumbing usually fails in Polk County, what a repair involves, who is licensed to do it in Florida, and how to get a plumber out.
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How mobile home plumbing is different
Manufactured homes are built to the federal HUD code. Supply lines and drains run under the floor and connect to the park’s or the lot’s water and sewer at one or two points under the home. Federal rules (24 CFR 3280.603) require piping that is exposed to the weather to be protected from deterioration, and piping exposed to freezing to be insulated or otherwise protected. Over decades, that protection wears out, and the bottom board and vapor barrier hide what is happening behind it.
Where it usually goes wrong
- Leaks under the floor. A loose fitting or cracked line under the home soaks the insulation and bottom board. The first signs are often a soft spot near the bathroom or kitchen, a sagging belly, or a musty smell.
- Polybutylene supply lines. Gray plastic polybutylene pipe was widely used in homes built from the late 1970s to the mid-1990s, including many mobile homes. It is known for failing at the fittings. It also matters for insurance: a 4-point inspection lists the pipe types, and Citizens says new HO-3 and HO-8 policies are not written on homes over 20 years old with polybutylene. See our 4-point inspection guide.
- Drain line sags and separations. Drains hung under the home can lose their supports and sag, which slows drainage and lets joints pull apart. A home that has settled out of level makes this worse, which is one reason to relevel before chasing drain problems.
- Water heaters. Tanks wear out, relief valves stick, and pans and drain lines get skipped. An insurer’s 4-point form asks about the water heater’s age and a working relief valve.
- The connection to the park. The riser where your home ties into the water or sewer line is a common leak point, and it is where your responsibility may end and the park’s begins.
What a repair usually involves
A plumber starts by finding the leak, which often means opening a section of the bottom board under the home. The fix may be a fitting, a section of pipe, a re-hung drain, or a full repipe if the supply lines are polybutylene or failing in several places. Once the plumbing is fixed, the opened bottom board and any wet insulation or vapor barrier need to be repaired and closed back up, or moisture and pests get in. Our vapor barrier page covers that part.
Ask the plumber to show you the damage and the repaired section before the belly is closed, and to put the scope and price in writing.
If you rent your lot
Under section 723.022 of the Florida Statutes, a mobile home park owner must keep the utility connections and systems it is responsible for in proper operating condition. Where the park’s responsibility ends and yours begins is usually set by your prospectus or park rules. Before you pay for a sewer or water line repair near the connection, ask park management in writing whose side of the line the problem is on. Our Chapter 723 guide covers your other rights as a lot renter.
Who can do the work in Florida
Plumbing is a licensed trade in Florida. Under section 489.105 of the Florida Statutes, a plumbing contractor’s license covers water supply, drainage, venting, water heaters and the related piping. Check the company or license number at myfloridalicense.com before work starts, and ask whether they work on manufactured homes regularly.
Permits in Polk County
Larger jobs, such as a repipe or a water heater replacement, often need a plumbing permit, and the plumber should pull it. Inside a city such as Lakeland or Winter Haven, ask that city’s building department. In unincorporated Polk County, it is the county Building Division, 330 W. Church St., Bartow, (863) 534-6080. Ask whether the permit is in the price.
Signs it is time to call
- A water bill that jumps without a change in use
- Soft or spongy floor near a bathroom, kitchen or the water heater
- A sagging or wet bottom board, or water dripping from under the home
- Gray plastic supply pipe at the water heater or under the sinks
- Slow drains in more than one fixture, or sewer smells under the home
- Low water pressure that comes on gradually
Frequently asked questions
How do I know if my mobile home has polybutylene pipe?
Look at the supply lines at the water heater, under the sinks and where the water line enters the home. Polybutylene is usually gray, flexible plastic pipe, often stamped “PB2110.” A plumber or 4-point inspector can confirm it.
Who pays for a sewer line problem in a mobile home park?
It depends on where the problem is. Florida law requires the park owner to maintain the utility connections and systems it is responsible for, and your prospectus or park rules usually say where that responsibility ends. Ask the park in writing before you pay for a repair near the connection.
Can a leak under a mobile home damage the floor?
Yes. Water trapped under the home soaks the insulation and subfloor, and a slow leak can rot the floor near bathrooms and kitchens before you see it. Fix the leak first, then repair the vapor barrier and bottom board.
Does a mobile home plumbing repair need a permit in Polk County?
Larger jobs such as a repipe or water heater replacement often do. Inside a city, ask that city’s building department. In unincorporated Polk, call the county Building Division at (863) 534-6080.
Get a free plumbing repair quote
Tell us where the home is and what you are seeing (a leak under the home, slow drains, a soft floor, gray pipe), and a local licensed plumber will follow up with a free quote.
Related reading: Mobile Home 4-Point Inspection · Mobile Home Vapor Barrier Repair · Mobile Home AC Repair · Florida Chapter 723 Lot Rights