Slow or Backed-Up Drain? Drain Cleaning in Potomac, MD Starts With Finding the Blockage

One slow drain or the whole house: how to tell where the clog sits

The first useful fact about a clog is where it sits, because that decides who fixes it and how. A sink that drains slowly while every other fixture works is a local problem. A basement floor drain that bubbles when someone upstairs runs the washer is a different problem altogether.

Walk through the house before you call and note which fixtures are affected. Two minutes of notes gives the plumber a head start and keeps the quote honest.

If water is rising at the lowest drain, stop running water in the house, including the washing machine and dishwasher. Every gallon you add goes to the same blocked line, and the lowest opening is where it ends up.

Plunger and drain tool steps to try first, and when to stop

A plunger, a hand-held drain tool and a few minutes at a single fixture are reasonable first steps for a slow sink, tub or shower. Pull the stopper and clear the hair that collects under it before anything else. For a clogged toilet, use a flange plunger and give it steady strokes rather than quick jabs.

• Remove the stopper or strainer and clean it, then run hot tap water for a minute.
• Use a plunger on one fixture at a time, with the overflow opening blocked on sinks and tubs.
• Keep water use low if more than one fixture is slow.
• Skip chemical drain cleaners. They rarely clear a main line clog, they can harm older pipe, and they leave caustic liquid for the next person who opens the line.

This page covers drains inside the house. Yard drains and French drains are different systems, so say on the call if that is what is backing up. Commercial kitchen grease lines are covered further down this page.

Stop when a second fixture shows the same problem, when plunging brings dirty water up in a different drain, or when you hear gurgling from a drain that was not in use. Those signs mean the blockage is past the fixture, and more effort at the sink will not reach it.

Whose pipe is it when the clog is outside the house?

Potomac is unincorporated, so the public sewer is WSSC Water's. WSSC states that the sewer service from the property line to the building is the property owner's responsibility. Where the line joins a WSSC main, WSSC maintains only the connection to that main.

That makes the plumber the right first call for a backup, not WSSC. WSSC says plumbers and sewer drain cleaners must be registered with WSSC to work in Montgomery County, so ask for the registration number before work begins and keep it with the invoice. You can check a plumber through the WSSC plumber lookup.

If the plumber finds the blockage in WSSC's section of the line, the plumber reports it and WSSC sends its own crew. The homeowner still pays the plumber's bill. WSSC's claims office, at 301-206-7095, reviews requests for reimbursement where roots or a broken WSSC pipe caused the problem. For an active backup, WSSC's 24-hour emergency line is 301-206-4002.

That is why the written report matters. Ask the plumber to state where the blockage was and what caused it, so you have it if you apply for reimbursement. If the line itself is damaged and needs digging, the work belongs on the main sewer line problems page, because only a WSSC master plumber may excavate underground sewer pipes and WSSC inspects that work.

What to ask a plumber to document before you pay

A short written record protects you if the problem returns, if WSSC is involved or if your insurer asks questions. Ask the plumber for the following before they leave.

• Their name, license or registration number and the date of the visit.
• Which fixture or line was cleared and how far the tool or camera traveled.
• What was found: grease, roots, a foreign object, a sag or a broken joint.
• Whether the blockage sat on your side of the property line or in WSSC's section.
• What the plumber recommends if the problem recurs, and whether any work needs a permit.

Prices are quoted after diagnosis, and the cost page lists the drain cleaning cost factors that move a quote. A short, honest answer on the phone about what you see and which fixtures are affected usually leads to a better first visit.

Commercial kitchens and grease drains in WSSC territory

Restaurants, cafeterias and other food businesses have a different grease problem from a house. WSSC names cooking fats, oils and grease as one of the most frequent causes of sewer clogs, and it regulates them through a fats, oils and grease program for food service establishments.

Under that program, every food service establishment must apply for a WSSC discharge permit for fats, oils and grease and hold a health department license from its county. WSSC says all of these kitchens are subject to annual inspections and can be inspected at any time after a complaint or a report of a sewer blockage. Investigators check that every required fixture is connected to an adequately sized grease treatment device, and they can review maintenance records. WSSC also offers FOG training to food service establishments and to the haulers who pump grease waste.

• Keep dated records of every interceptor pump-out and every line cleaning.
• After a pump-out, look inside the interceptor to confirm it was cleaned fully.
• When a kitchen line backs up, say which fixtures are affected: floor sinks, prep sinks, dish machine or the main.
• Ask for a camera look at the line after clearing it, and keep the findings with the maintenance file.
• Ask the plumber whether the blockage was in the building's line or past the property line.

Clearing a clogged kitchen line is plumbing work. Pumping an interceptor is done by a grease hauler. A kitchen needs both on a schedule, and a repeat clog usually means the schedule is too loose. For permit or inspection questions, WSSC Permit Services is at 301-206-4003.