There is no single answer: whether cleaning drains requires a plumbing license is decided state by state, and in places city by city.
Texas requires even entry-level drain cleaners to register with the state plumbing board and work under a responsible master plumber.
West Virginia does not count unclogging a sink as plumbing work at all.
Here is where the line sits, and where NASSCO's PACP classes fit in.
When does drain cleaning count as plumbing?
The licence question starts with how a state defines plumbing work, and the two definitions below put drain clearing on opposite sides of that line.
It is the question that shapes a drain technician career from day one: where clearing a line counts as plumbing, the work falls under the plumbing licence; where it does not, it does not.
West Virginia draws a narrow exclusion.
The plumber-certification FAQ on the state labor department's licensing site lists what plumbing work does not include — among them replacing faucets or washers, unclogging sinks, and installing dishwashers.
So clearing a stopped sink in West Virginia is not work that requires a plumber licence.
The examples the FAQ lists are fixture-level ones, and our research captured that list, not a ruling on main-line sewer work — check the FAQ and the board before you assume anything beyond a sink clog.
Our West Virginia plumbing license guide covers the state's licensing setup.
Texas puts the same kind of work inside plumbing law.
Occupations Code 1301.002 defines a drain cleaner-restricted registrant: someone registered with the state's plumbing board who clears obstructions in sewer and drain lines through existing code-approved openings, under the supervision of a responsible master plumber.
Entry-level drain cleaning is not unregulated there — it is a registered, supervised activity.
That spread is why the honest answer always starts with a location.
Before you take drain work, or advertise it, check how your state defines the work and whether licensing sits with the state board or is handled locally by cities and counties.
The trade's full ladder is covered in our plumbing license requirements guide, and the general question of whether you need a license to be a plumber gets its own page.
Rules change, and licensing can be local
Restricted drain-cleaner licenses
Texas is the worked example in the research, and its system treats these as registrations inside the plumbing trade rather than standalone licences.
The Texas State Board of Plumbing Examiners issues three related registrations at $18 each: Drain Cleaner-Restricted, Drain Cleaner and Residential Utilities Installer.
The Residential Utilities Installer registration requires at least 2,000 hours working in the plumbing trade as a Plumber's Apprentice.
The drain ladder inside that system has two rungs.
The entry rung is the drain cleaner-restricted registrant from the last section: clearing obstructions in sewer and drain lines through existing code-approved openings, under a responsible master plumber.
The Drain Cleaner registration broadens the work: it requires at least 4,000 hours working as a drain cleaner-restricted registrant under that master-plumber supervision, and it adds the authority to install cleanouts and to remove and reset P-traps to clear obstructions — still under supervision.
Renewal carries its own requirement: drain cleaner, drain cleaner-restricted and Residential Utilities Installer registrants must complete at least six hours of approved training each year.
The two drain registrations stay drain-scoped — clearing obstructions, cleanouts, P-traps — rather than opening up the whole trade.
The Texas plumbing license state page covers the state's full ladder.
Beyond registrations, licence classes themselves can be scoped to sewer and drain work.
Hawaii licenses plumbing contractors as C-37, with a C-37a subclass for sewer and drain line contractors.
Connecticut licenses plumbers statewide through its Department of Consumer Protection's Plumbing and Piping Work Board — P-2 Unlimited Journeyperson Plumber and P-1 Unlimited Plumbing Contractor among them, plus limited classes that include P-6 and P-7 for sewer, storm and water work.
North Carolina's plumbing board issues a Restricted Limited Plumbing (RLP) contractor licence scoped to exterior building sewer piping, exterior water service piping 2" or less, exterior backflow preventers on 2" or less piping, and water filtration systems.
North Dakota's plumbing board issues separate licences for sewer and water installers and contractors.
Licensing can also sit at the city level.
Chicago's trade-specific licences cover drain layer, electrical, elevator, mason and plumbing contractors — drain layer is on the city's own list.
What that licence covers, and how it relates to drain-cleaning work, is not established by our research; the city's licensing pages are the authority.
Put together, the pattern is the point: Texas registers drain workers with its plumbing board, and West Virginia's FAQ puts unclogging sinks outside its plumbing-work definition.
Hawaii licenses a C-37a sewer and drain line contractor subclass, Connecticut lists P-6 and P-7 among its limited sewer, storm and water classes, and North Carolina scopes its RLP contractor licence to exterior building sewer piping and related limits.
Chicago lists drain layer among its city trade licences.
Whatever a state calls it, the class definitions the board publishes are the authority on what each one permits.
Do you need NASSCO PACP certification to run a sewer camera?
The camera credential question is separate from the licence question.
Whether any authority requires a certification before you run a sewer camera is not something our research confirmed — what the research does show is where the classes sit: NASSCO runs PACP, LACP and MACP classes for pipeline, lateral and manhole assessment, plus ITCP-CIPP inspector training for cured-in-place pipe.
Notice what they are: classes, not licences.
Every licence and registration named on this page comes from a state board or a city; PACP, LACP, MACP and ITCP-CIPP come from NASSCO.
And where a state does require a registration to clear lines — Texas, again — that requirement is the board's, so the classes do not substitute for it.
What our research did not capture is the fine print: class lengths, costs, prerequisites, exam formats and renewal terms are not confirmed here, so treat NASSCO's current class pages as the authority before you book.
Whether shops near you ask for the classes is your own check: scan live drain technician jobs and ask the hiring manager.
What the inspection work itself involves — camera and locator technique, and the reporting that turns a run into a diagnosis — is covered in our sewer camera inspection guide.
Career information, not legal advice — licensing and registration requirements for drain work are set by state plumbing boards and, where licensing is local, by cities and counties. Confirm the current rules with the authority where you work, and check NASSCO for current class offerings.