Drain cleaning services in the Mission, Castro and South San Francisco

Older flats and dense blocks

The central and southern districts have some of the oldest buildings in the city: Victorian-era and Edwardian houses, often converted into flats, along with apartment buildings, rowhouses and a good deal of newer infill. Streets run flat across the valley floor and climb steep hills toward the south.

Most buildings have more than one household on the line, and many have been altered several times. The age and type of the building point at what the drains are made of, and the number of units points at who calls.

Flats and shared laterals

In a building of two to four flats, one lateral usually serves all of them. A blockage affects every unit upstream, and the lower flat usually shows it first. The owner or manager usually arranges service for the shared line.

Tell us how many units share the line and which are affected. See multi-unit building drains.

Cast iron stacks and old branches

Older buildings carry waste down cast iron stacks, with branches under raised floors. Scale and corrosion narrow the bore, and grease and wipes catch on the rough wall. See cast iron drain cleaning.

Clay laterals and old street trees

Beyond the building, the lateral is usually clay. Joints loosen over decades, and roots from street trees or neighbouring yards enter the open ones. See clay sewer lateral clogs and tree root removal.

Raised floors and crawlspaces

Many older buildings have raised floors with a shallow crawlspace. Drains run beneath, where a technician can reach them. Sagging runs and mixed materials are common. See raised-foundation drain clogs.

Steep lots to the south

Streets climb steeply in the south. Laterals on sloping lots run long and change grade, and solids settle where the pipe levels out. Cleanouts may be at more than one level. See hillside sewer lateral clogs.

Kitchens, restaurants and busy streets

The central streets are lined with restaurants and cafés, and many buildings have a restaurant below and flats above sharing a line. Grease is a leading cause of clogs, and jetting is often the right tool. See kitchen grease clogs and restaurant and commercial drains.

In-law units and alterations

Many buildings have a ground-floor unit or an added bathroom tied into the original lateral. Adding fixtures to an old line can reveal roots, scale or a low spot. Remodels leave mixed materials.

Winter rain

Rain tends to arrive in winter bursts. Older laterals with open joints can take in water and silt. A camera reveals where silt collects.

Access in flats and steep streets

Cleanouts in older flats may be at the front stairs, in a rear light well, in a garage or in a ground-floor service room at the base of a stack; on steep streets they may be several steps below the sidewalk. Coordinating with the owner saves time, and so does telling the technician where a truck can stand.

If the cleanout is under the building, say so. The technician will explain how they plan to reach it, and will not enter a space with standing water.

Habits for a building with several households

A building with several households benefits from shared habits more than any other. Grease in the bin, wipes in the bin, a strainer in every sink and a hair catcher in every shower reduce the load on a shared line, and a short note to every unit is cheap.

These habits do not make a failing line sound, but they extend the time between visits, and they make each visit smaller. We do not recommend chemical or enzyme products.

Buying or selling an older flat

Buyers of older flat buildings routinely ask for a sewer camera inspection, and sellers sometimes order one first. A scope shows the pipe material, roots, offsets and low spots, and in a shared line it shows where branches from separate units join. Because lateral rules vary by city and agency, check locally before relying on a scope in a sale. We do not state any rule.

See sewer scope when buying or selling.

A plan for a building with repeat clogs

If a building has had more than one backup, ask the technician to run a camera through the building drain and the lateral once the line is open, and to note which branch each blockage came from. A short log of dates, units and findings turns emergencies into a pattern.

A schedule follows: jetting on kitchen branches matched to how fast grease returns, a camera run every year or two on an old lateral.

What a camera usually shows in older flats

In an older flat building, the camera typically shows cast iron with scale inside, junctions where branches from several units meet and, beyond the building, a clay lateral with a few open joints and sometimes roots. Seeing each tells you whether a cleaning will hold or a schedule is the sensible plan.

What helps when you phone

Tell us the building type, the year built, how many units share the line, which units and fixtures are affected and where the cleanout is. If it has backed up before, tell us when.

The visit, step by step, and the price

Call at any hour. The person who answers asks about the affected drains, the age of the building, slab or raised foundation, and any known cleanout, and then passes you to an independent technician close by. They tell you the price before any work begins. This is general information, and your Mission, Castro and the South property may not match it exactly.

We do not promise a set arrival time. Emergency calls are taken around the clock, though. Rules about laterals differ by city and agency, so check locally before a purchase or sale.

Common questions