My septic system still works. Does Mobile make me connect now?

Not while it works, under the code as written. Mobile's plumbing code lets private sewage systems that existed when it was adopted stay in use until they fail or need repairs. At that point, connection to public sewer is required if it's available. So a failed drain field on a street with a MAWSS main means connecting, not rebuilding the septic system.

Can the old tank just be left in the yard?

Yes, once it has been pumped and filled under the state and city rules in the tank section above. Removing it is the owner's choice.

Does the plumber pump the tank, or do I call a septic company?

The pumping is done by a state-licensed pumper, and the permit holder answers for it under Mobile's code, as the tank section above explains. Ask the plumber whether the pumper's charge is in the quote or billed to you separately.

Septic to Sewer Conversion in Mobile, AL

Conversion price: HomeGuide's national guides put converting from septic to sewer at $3,000 to $15,000.
Timeline: HomeGuide says connecting to a city sewer takes 1 to 5 days, depending on obstacles and the digging method.
Tank abandonment: Alabama's health rule has the old tank pumped by a pumper licensed by the state Onsite Wastewater Board, then removed or filled with sand or soil.
City rule: Mobile's plumbing code says septic tanks are pumped and filled by the permit holder when a house connects to public sewer.

Mobile Sewer Line Replacement points homeowners leaving septic toward a master plumber, the license Alabama requires to contract for plumbing. Ask the quote to cover three parts: taking the tank out of service, laying a new building sewer of at least 4 inches to the public lateral, and the inspected connection at the property line.

Septic to Sewer Conversion, Step by Step

Before anything else, check that MAWSS serves your street; its website answers that with a service-area map. The work then splits into the jobs below.

Old concrete septic tank opened in a backyard, partly filled with clean sand, with a plain gray shovel on the soil pile

Pumping and Filling the Old Septic Tank

Alabama's health rule says a tank whose use stops is abandoned. It is pumped out by a pumper licensed by the Alabama Onsite Wastewater Board, then either removed or filled with sand or soil, and its bottom may be broken open. Mobile's plumbing code adds that the permit holder pumps and fills it when the house connects to public sewer. HomeGuide says most owners fill the tank with sand rather than pay extra to remove it.

Removing the Tank Instead

The state rule lets the owner remove an empty tank, and the hole is then filled with sand or soil. Removal costs more but frees the ground, which matters if a slab, shed or driveway is planned where the tank sits.

New Gravity Building Sewer to the MAWSS Tap

The pipe that ran to the tank is rerouted toward the street. Mobile's code sets the floor: no building sewer under 4 inches, and the two-way cleanout the city asks for at the junction with the building sewer (cleanout rules). Pipe lighter than Schedule 40 pressure-rated on a public sewer needs at least 12 inches of cover and can't run under a driveway or parking area. The fall per foot is on the belly repair page.

Green fiberglass grinder pump station lid set in a lawn beside a raised house on brick piers

Grinder Pump Where Gravity Won't Reach

Some lots sit too low for the house sewer to fall to the main. MAWSS policy covers this case: a grinder pump on a MAWSS connection must be one of the pumps on its accepted list, and MAWSS doesn't maintain the grinder station. Where a customer has to come off the gravity system because of a grade conflict, MAWSS may help with the cost of a pressure sewer if the owner gets quotes from three licensed plumbers and finishes the work within 60 days.

Streets With No Sewer Main Yet

If the main hasn't reached your street, a plumber can't connect you. MAWSS lets residents of an existing community ask it to extend sewer: they submit a map, the area, and a survey of likely users, and MAWSS contributes toward the cost if the project pays back in 20 years or less.

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

Septic to Sewer Conversion Cost in Mobile

HomeGuide's $3,000 to $15,000 national range covers decommissioning the tank, a new main sewer line and the connection. MAWSS's own capacity and tap charges come on top, and some owners can finance them; the 2025 amounts and terms are on the sewer line installation page.

HomeGuide names distance from the main line and the digging method among the things that move a hookup price. Ask for a quote that lists the pumper's charge, fill material and the plumbing permit separately.

Who Does What When You Leave Septic

Alabama splits the work. The plumbers' board treats septic systems permitted by the health department as onsite systems, not plumbing, and says a pump that is part of an onsite system needs an installer licensed by the Alabama Onsite Wastewater Board. The new building sewer that connects to the public sewer is plumbing, and must be done by a plumber certified by the state plumbing board. MAWSS adds that a licensed plumber has to connect the private lateral to the public lateral. How to check that license is on the sewer line repair page.