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Drains & sewer in Boston, MA

A single slow sink is usually a local clog a plumber can clear in one visit. Several drains backing up at once, gurgling toilets or water at a basement floor drain point to the main sewer line, which may need cleaning, a camera inspection and sometimes repair.

  • Licensed local plumbers
  • The problem explained before work starts
  • Price agreed before the job begins
Plumber working on the drain pipes under a sink

Drains & sewer services in Boston

Local conditions

Drains & sewer in Boston: what's different

Cast-iron stacks in Boston triple-deckers and brownstones run the full height of the building and crack and leak with age. Because the plumbing is stacked, a clog or a split stack upstairs often shows up as a leak or backup in the unit below.

Older homes in Dorchester, Jamaica Plain and Roslindale also have aging laterals out to BWSC sewers. A camera inspection shows whether the problem is a clog, roots or a broken pipe, and Massachusetts requires licensed plumbers for the repair.

Water and sewer in Boston
The Boston Water and Sewer Commission provides water and sewer service.
Permits in Boston
Plumbing permits are issued by Boston's Inspectional Services Department (ISD), and work must be done by Massachusetts-licensed plumbers.

Boston housing and plumbing

Triple-deckers, brownstones and row houses, many over a century old, typically have basements, cast-iron drains and older service lines.

Other Boston conditions that affect plumbing

  • Frozen pipes: Nor'easters and cold snaps freeze pipes in exterior walls and porches.
  • Old drains and stacks: Cast-iron stacks in triple-deckers crack and leak with age.
  • Lead service lines: BWSC runs a lead service replacement program for older homes.
  • Old water mains: Boston's water system is one of the oldest in the country, and older homes may connect through aging service lines.

Neighborhoods and ZIP codes

Plumbers on Thawline cover Boston and Suffolk County, including Dorchester, Jamaica Plain, South Boston, Roslindale, Charlestown, West Roxbury. ZIP codes: 02108 · 02109 · 02110 · 02111 · 02112 · 02113.

When to call a plumber in Boston

  • Water backing up in the tub or shower when a toilet flushes
  • Several fixtures draining slowly at the same time
  • Water or sewage at a basement floor drain
  • Gurgling from drains or toilets
  • Sewer smell inside or a soggy patch in the yard
  • The same clog returning within weeks of being cleared

How these problems start and how to choose between repair options is covered in the drains & sewer guide.

Drains & sewer questions in Boston

Why does my Boston triple-decker drain back up on the first floor?

Because the drains are stacked, a clog in the main stack or lateral backs up at the lowest fixtures first, usually on the first floor or in the basement.

Are chemical drain cleaners safe to use?

They can damage older pipes and fixtures, and they make the job hazardous for the plumber if they don't work. A plunger or a drain snake is safer for a single slow drain.

More plumbing in Boston

Need help with drains & sewer in Boston?

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