Sewer line repair and backups in Miami-Dade

How you know it is the main line

• More than one fixture is slow or backing up, on the lowest floor first
• A toilet bubbles when the washing machine drains, or a tub fills when a toilet flushes
• Sewage or gray water at a floor drain, a ground-floor tub, or the cleanout in the yard
• A wet, green, or sunken strip in the lawn along the path to the street
• Sewer smell indoors or at the cleanout
• It has been cabled before and came back within months

One slow sink is a drain problem. Everything at once is the line that leaves the house, and the tool is different.

Cable, jet, camera, and what each tells you

A cable machine cuts through a blockage and gets the water moving; it is the right first move for a line that is stopped, and the wrong last move for a line that keeps stopping. A hydro-jet scours the pipe wall, clears grease and scale, and cuts roots; it is what an old line that is narrowed but intact needs. A camera inspection is how a plumber tells the difference between a clog and a broken pipe, and it is the step to insist on before anyone quotes a repair. Ask for the recording, or at least to watch the screen: a belly holding water, a root mass at a joint, a section of cast iron with the bottom rusted out, and a collapsed pipe all look different and cost very different amounts.

Cast iron, clay, and roots: why Miami-Dade lines fail

Homes built before about 1975 in Hialeah, Little Havana, Shenandoah, Coral Gables, and older Kendall have cast-iron drain lines under the slab and out to the street, and cast iron in wet South Florida ground lasts fifty years or so. The bottom of the pipe rusts through first, in channels, so water still flows until the rainy season fills the ground and the county main runs full; then there is no path. The oldest laterals are vitrified clay with joints every few feet, and the roots of a ficus, a mango, or a black olive find every joint. Newer subdivisions in Doral and West Kendall are PVC, which fails at bad joints and where fill has settled, not from age.

Whether your street is on county sewer or septic changes everything. A large part of Kendall, Palmetto Bay, Cutler Bay, and Homestead is still on septic; there, a house that backs up in July usually has a drain field sitting in saturated ground, not a blocked pipe, and the answer is a septic contractor and possibly the county's septic-to-sewer program. A plumber who works South Dade will ask which you are before they load the truck.

Repair options, from least to most

• Spot repair. Excavate the one bad section and replace it. Right when the camera shows a single break or a root intrusion at one joint.
• Pipe lining (CIPP). An epoxy-saturated liner cured inside the existing pipe, making a new pipe within the old with no trenching. Right for a line that is rough, rooted, or channeled but still round and continuous; wrong for a belly or a collapse, which a liner follows rather than fixes.
• Replacement. A new line from the house to the county connection, trenched or pulled through. The permit is from the city or Miami-Dade RER depending on where you are, and the connection at the property line involves Miami-Dade Water and Sewer.
• Backwater valve. For a low house on a street that backs up in every storm, a permitted valve on the main line that stops the county's sewer from coming into the house. It does not help a septic system.

What to have ready

Say which fixtures are affected, whether it is the first time, whether you are on sewer or septic if you know, and whether there is a cleanout outside. The plumber should quote the clearing and the camera as separate steps, and any repair only after the camera. If sewage is in the house, mention it: the cleanup is a health matter, and the plumber will tell you what to keep out of until it is done. Keep everyone off the affected floor, do not run water, and do not use chemical openers on a main line; they sit in the belly and burn the next person who opens it.