Drain Cleaning in Baltimore, MD

Is the clog in one drain or in the main line?

A clog that affects only one sink, tub or toilet sits in that fixture’s drain; a backup at the lowest fixture in the house points to the main line. WSSC Water, the utility for Montgomery and Prince George’s counties, adds a second main-line sign: drains that keep backing up while nobody is using water.

• Only one drain is slow or blocked: the City of Naperville, Illinois, water utility calls a backup from one drain, while every other drain works, an internal plumbing problem for a plumber.
• Water comes up at the lowest fixture: WSSC tells customers to call the utility to investigate a backup at the lowest toilet, shower or laundry tub in a building, a sign of a service line or main problem.
• Backups happen only while fixtures are in use, or not at the lowest level: WSSC suggests a registered plumber or sewer drain cleaner.
• A sewer smell from a basement floor drain: WSSC says a dry floor drain trap lets sewer gas into the house, and a few cups of water poured down the drain refill it. It investigates odors unless the smell is limited to one fixture or an upstairs bathroom.

WSSC and Naperville are not Baltimore utilities, so use their checklists as general guidance; in Baltimore, the property line decides who clears a main line stoppage, as explained below. When sewage is already on the basement floor, start with the Baltimore basement sewage backup checklist.

Is chemical drain cleaner safe to pour into a clogged drain?

Only with great caution, according to Poison Control. Many drain cleaners contain concentrated acids, such as sulfuric or hydrochloric acid, or alkalis, such as sodium or potassium hydroxide, that cause serious burns. Poison Control says caustic products do their damage instantly, and the injury cannot be reversed, only treated.

• Wear goggles and rubber gloves, and pour slowly and close to the drain, as Poison Control advises.
• Pouring too much cleaner into a completely blocked drain, or pouring from too high, can make it splash back, Poison Control warns.
• Never mix products. The New Jersey Department of Health warns that bleach mixed with drain openers or acids can release toxic gases, and that different brands of drain cleaner can react dangerously with each other.
• If cleaner splashes onto skin, rinse with running water for at least 20 minutes while taking off any clothing it touched, then contact Poison Control at 1-800-222-1222.

Does clearing a clogged drain need a permit in Baltimore?

Not in Baltimore County, as long as no fixture or section of the drainage system is replaced. County Code § 21-15-303 exempts clearing stoppages from plumbing permits, and the County plumbing code also exempts removing and resetting a toilet to reach a cleanout opening when no valves, pipes or fixtures are replaced or rearranged.

• Baltimore City’s 2024 Building Code adopts the International Building Code’s plumbing permit exemptions. DHCD’s “Work Exempt From Permits” handout, last revised in March 2021, lists clearing stoppages without replacing valves, pipes or fixtures as exempt work for buildings other than one- and two-family dwellings.
• The same City handout treats removing a defective concealed drain pipe and replacing it with new material as new work that needs a permit and an inspection.
• Baltimore County’s plumbing code likewise treats replacing defective pipe with new material as new work that needs a permit from Permits, Approvals and Inspections.

When does a clogged drain mean a broken sewer lateral?

When the main line keeps backing up after it has been cleared, the pipe itself may be cracked, root-filled or collapsed, and cleaning does not repair a damaged pipe. Baltimore City DPW names tree roots and pipe deterioration, alongside grease and wipes, as causes of sewer blockages and basement backups.

DPW recommends having the lateral inspected, and says repairing a broken lateral, which it calls the homeowner’s responsibility, can eliminate root intrusion and prevent sewer backups. A camera inspection shows whether the pipe is damaged: in 2014, DPW announced camera inspections of 9,000 City laterals with a history of backups, run through exterior cleanouts where they existed. Pipe material matters too: our emergency pipe repair page has a table of how cast-iron drains and clay sewer laterals fail alongside other pipe materials.

Fixing a damaged line is repair work, not drain cleaning. Methods and permits are covered under spot repair, lining and replacement of broken sewer laterals, and what replacing a Baltimore sewer lateral typically costs is broken down by method in our cost guide.