Drain cleaning services in San Francisco, CA

A dense, hilly, older city

San Francisco packs a great deal of housing onto a small, hilly peninsula. Most of it is older than the housing in other Californian cities: attached rowhouses and flats from the early twentieth century, detached homes on narrow lots, and larger apartment buildings of every era. Post-war neighbourhoods on the western side were built in long rows of similar houses, many on raised floors above a ground-level garage.

Three things shape drains here more than anywhere else in the state: age, density and slope. The questions we ask are about the building: when it was built, how many units share the line, where the garage and the cleanout are, and how steeply the lot falls. They are clues, not a diagnosis, and a camera confirms.

We describe the city here in four districts, each with its own page and ZIP codes.

Garages under the house

In many homes the garage sits at street level, with living space above and often a flat or in-law unit behind. The main drain may run beneath or alongside the garage floor, and the cleanout may be inside the garage, in a wall or at the front of the building. A technician working in a garage may be working under a car-sized space with a low ceiling.

Tell us where the garage is and whether the cleanout is inside it. See cleanout location and access.

Rowhouses and rear-yard laterals

Attached houses are built wall to wall. A lateral may run from the back of the house to the street through a narrow strip beside the building or, in some blocks, through a rear yard and an easement. Shared walls mean shared risks: a root or an offset in one lateral may affect the pipe next door.

Access can be tight, and the technician may need to reach a cleanout through the garage or a side gate. Tell us what you know about how the line runs.

Clay laterals and old street trees

Older laterals are clay, with joints that loosen over decades, and street trees, though fewer than in suburban cities, stand along many blocks. Roots follow moisture to open joints. The usual pattern is a slow drain, a gurgle and a repeat a year later. See clay sewer lateral clogs and tree root removal.

Cast iron stacks and branches

Flats and apartment buildings carry waste down cast iron stacks. Scale narrows the bore, and grease and wipes catch on the rough wall. A blockage in a stack can affect every unit above or below it. See cast iron drain cleaning.

Steep streets and hillside laterals

Many lots fall steeply from the street. Laterals run long distances, change grade and sometimes cross a slope behind the building. Solids settle where the pipe levels out, and cleanouts may be at more than one level. See hillside sewer lateral clogs.

Raised floors and crawlspaces

Many older homes sit on raised foundations with shallow crawlspaces, where drains can be reached from below. Sagging runs, loose joints and mixed materials are common. See raised-foundation drain clogs.

Flats, apartments and shared lines

A large share of the city lives in flats and apartments. Several households share a stack and a lateral, so a clog affects every unit upstream, and grease from several kitchens coats the shared line below them. The owner or manager usually arranges service. See multi-unit building drains.

In-law units, remodels and added bathrooms

Many buildings have a ground-floor unit, a converted garage or an extra bathroom tied into the original lateral. Adding fixtures to an old line can reveal roots, scale or a low spot. Remodels also leave mixed pipe materials. See ADU and added-bathroom clogs.

Winter rain and silt

Rain in the region tends to arrive in winter bursts. On steep ground, water moves quickly through the soil, and older laterals with open joints can take in water and fine silt. Silt settles where the pipe levels out, and some homes notice slow drains or backups during or just after a wet spell. A camera shows where it collects.

Kitchens and restaurants

Dense neighbourhoods with busy restaurants and busy home kitchens make grease a leading cause of clogs. In flats, several kitchens feed one line. See kitchen grease clogs and restaurant and commercial drains.

Buying or selling a San Francisco home

Buyers of older homes 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 where a lateral runs. 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.

Pipes under the street, era by era

A quick guide, with the usual caution that it is a tendency and not a diagnosis. Buildings from the early twentieth century typically have clay laterals running to the street, with cast iron or galvanised branches inside, on raised floors or over a garage. Post-war houses on the western side usually have cast iron, with a lateral that may be clay or, in some blocks, a fibre pipe known as Orangeburg. Later buildings mostly use ABS and PVC.

Remodels blur the lines. An older flat with a new bathroom has plastic in places, and a lateral may have been replaced at some point along part of its length. In a dense city, a line may also be shared with a neighbour, so the pipe under one building can reflect work done next door.

Only the camera shows what yours has, section by section. Tell the technician what you know, including any plumbing work done in the past. It helps them choose the right tools and decide whether the camera should go first.

Homes of that era sometimes have fibre pipe or failing iron, and the camera confirms. We never tell a reader what their pipe is made of from the phone.

Street trees, roots and narrow lots

San Francisco has fewer street trees than most Californian cities, but the ones it has are well established, and roots do not need a large tree to cause trouble. A lateral in a narrow strip between buildings may lie within reach of a tree in a neighbouring yard or a planter in the sidewalk.

Roots rarely break a sound pipe. The trouble starts when a clay joint opens, and then the nearest root finds it. A line that backs up in the same season each year is the usual pattern, and a camera shows how many joints are affected.

We do not advise removing trees, and we do not recommend chemical root products. A cleaning schedule matched to what you can see is the usual way owners manage an older line. See tree root removal.

Low-flow fixtures and old lines

Many older buildings have had their toilets and fixtures replaced with low-flow models, which use less water to carry waste. In a smooth modern pipe that is fine. In an old lateral with roots, scale or a low spot, a smaller flush may not carry solids as far, and they gather where the pipe is weakest.

Nothing is wrong with the fixture. The pipe has less help than it used to. If a toilet in an older building clogs more often after a change of fixture, tell the technician. See low-flow toilet clogs.

The same applies to added in-law units and bathrooms, which put more flow through the same original line.

Have this ready for the call

It helps to know which drains are affected and whether more than one is involved, roughly when the building was built, whether it sits on a slab or a raised floor, whether you know where the cleanout is, and whether the garage is part of the layout. If there are other units on the line, say how many.

If a line has clogged before, say when and what was done. If you are buying or selling, mention your timeline. None of this needs to be exact. A rough description is enough for the technician to choose the right equipment.

A plan if the same line keeps backing up

If a line has clogged more than once, ask for a camera run once it is open. Ask where roots, scale or low spots are, what the pipe is made of and how far each is from the cleanout. Save the video, and write down the distances. Every San Francisco home is a little different, so describe yours when you call.

A plan based on footage is better than waiting for the next backup. No one can promise a clog will never come back.

Habits that make the biggest difference

A strainer in every kitchen sink, a hair catcher in every shower, wipes in the bin and cooking fat in a container do more than any product. In buildings with several households, a short note to everyone on the line helps.

From the first call to the final bill

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. Every San Francisco home is a little different, so describe yours when you call.

We do not promise a set arrival time. Emergency calls are taken around the clock, though. Because lateral rules vary by city and agency, check locally if you are buying or selling. If you are near Daly City, the same general points apply.

Questions people ask in San Francisco