Gaithersburg, Montgomery County, Maryland
Finding a Plumber Gaithersburg MD Starts With a Permit the City Does Not Issue
Read the City of Gaithersburg residential permit catalogue from top to bottom and you will find permits for building, decks, electrical work, fences, garages, gazebos, improvements, mechanical units, sheds, solar and swimming pools. You will not find a plumbing permit. Read the list of codes the city has adopted and you will find the 2021 mechanical code, the 2021 fuel gas code, the 2021 swimming pool code and the 2020 National Electrical Code. There is no plumbing code on it.
That is not an omission. In Montgomery County, plumbing has been carved out of municipal government entirely and handed to WSSC Water, the bi-county utility that serves Montgomery and Prince George county. It writes the plumbing and fuel gas code, issues the permits, runs the inspections, sets the exams and licenses the tradespeople. The practical consequence is simple and worth knowing before you dial: for plumbing, the city is not the place to call.
The Absence, Three Times Over
Where the City Draws Its Own Line
The city describes its permitting division scope in one sentence, and the sentence is worth reading slowly. It provides permitting and inspection services for all types of construction, including building, electrical, mechanical, fire systems, grading and sediment control, forest conservation, new road construction, storm drains, and stormwater management. Nine categories, and plumbing is not one of them.
The residential catalogue repeats the pattern in more detail. The electrical entry states that a residential electrical permit is required for all electrical work performed and adds that electricians are required to be licensed with the City of Gaithersburg. The mechanical entry requires a permit for the installation or removal and replacement of any permanently installed HVAC mechanical unit. There is no equivalent entry for plumbing and no equivalent licensing sentence for plumbers.
The adopted code list closes the argument. As of 23 October 2022, the city has adopted the codes below and nothing else in the building and trade family.
| Discipline | Code adopted by the City of Gaithersburg |
|---|---|
| Building | 2021 International Building Code, plus IRC, IEBC, IgCC and ICCPC |
| Mechanical | 2021 International Mechanical Code |
| Fuel gas | 2021 International Fuel Gas Code |
| Energy | 2021 International Energy Conservation Code |
| Swimming pool and spa | 2021 International Swimming Pool and Spa Code |
| Accessibility | Maryland Accessibility Code, ADAAG 2010 |
| Electrical | 2020 National Electrical Code |
| Plumbing | Not on the list. The code that governs it is published by WSSC Water. |
Which Desk Owns What
The Split, Written Out Once So You Only Look It Up Once
The city keeps everything structural, everything electrical and mechanical, all fire systems, all site and grading work, and all stormwater. Its Public Works department maintains nearly 93 miles of city streets along with sidewalks, curbs, gutters, street sweeping, lighting and snow removal, and it contracts recycling out to a private hauler. Stormwater is funded by a Stormwater Program Fee, formerly called the Water Quality Protection Charge.
WSSC Water keeps the water main, the sewer main, the plumbing and fuel gas code, the plumbing permit, the plumbing inspection, the plumber licence, the gasfitter licence and cross-connection control. Its Licensing Office answers on 301-206-8588 and its cross-connection team is split by county, 301-206-7932 for Montgomery and 301-206-8601 for Prince George.
One city rule catches households in winter regardless of any of this. Residents and business owners are required to remove snow and ice from the public sidewalks abutting their property within 12 hours of the last precipitation. That is a city obligation with a clock on it, and it sits in the same department that will not be handling your water heater.
What You Are Not Allowed to Do Yourself
The Utility Names the Jobs That Require a Licence
The regulations state that in Montgomery and Prince George county most plumbing projects must be done by a WSSC Water licensed plumber or gasfitter, and the stated reason is to ensure installations meet minimum code requirements. The published examples are specific rather than general.
- Construction of a new home
- Water service line repairs and replacements
- Sewer service line repairs and replacements
- Interior re-piping
- All gas work, including furnace replacement
- Gas water heater replacement
- Gas appliance replacement
- Any other fuel gas work
Homeowners are allowed some plumbing work of their own, and the utility points to section 106.9 of the Plumbing and Fuel Gas Code for the boundary. We have not read that section and so we do not state what it contains. What we can state is that the section exists, that it is where the homeowner limit is written, and that anything on the list above sits outside it. All permit applications go through the online ePermitting system, and paper applications are no longer accepted.
How Somebody Earns That Licence
Seven Thousand Five Hundred Hours, Then Three Thousand More
The licence ladder here is denominated in logged hours rather than years, and the hours must have been worked under the direction and control of somebody already licensed. Exams are administered by PSI rather than by the utility itself, and a passing report carries the instructions for obtaining the licence.
| Licence | Minimum logged hours | Worked under | Extra requirement |
|---|---|---|---|
| Apprentice | None, minimum age 16 | A licensed Master, directly or through a Journeyman | Age verification |
| Journeyman Plumber | 7,500 | A WSSC licensed Master Plumber or Master Plumber and Gasfitter | Current cross-connection backflow certification |
| Journeyman Gasfitter | 3,750 | A WSSC licensed Master Gasfitter or Master Plumber and Gasfitter | Apprentice card and three references |
| Master | 3,750 as a journeyman | A WSSC licensed Master | Two years of payroll records and a backflow course certificate |
| Sewer and Drain Cleaner | 3,750 | A licensed cleaner, Master Plumber or Master Plumber and Gasfitter | Employer statements and three referrals |
A journeyman plumber applicant must produce the apprentice card, W-2 forms covering the years of experience claimed, three letters of reference of which one must come from a Master they worked under, a fee, and the completed examination application. A Master applicant licensed outside the WSSC district must add a notarised letter from the appropriate regulator confirming that they passed a written exam and that the licence is in good standing.
What Each Level Actually Lets Somebody Do
Four Licences and the Work Each One Authorises
Apprentice Plumber
May assist in plumbing services and in sewer and drain cleaning services, under the direction of a licensed Master, or under a Journeyman who is themselves under a Master. Assist, never provide.
Journeyman Plumber
May provide plumbing services and sewer and drain cleaning services, but only under the direction of a licensed Master Plumber. The authorisation is to do the work, not to run it.
Master Plumber
May provide plumbing services and sewer and drain cleaning services outright, with no direction above them. This is the licence a plumbing firm is built around.
Gasfitter, separately
Gas work runs on its own parallel ladder, Apprentice, Journeyman and Master Gasfitter, and a combined Plumber and Gasfitter licence exists at each level for people who hold both.
The detail worth carrying away is that sewer and drain cleaning is written into the plumbing licence at every level, and also exists as a standalone registration for people who do nothing else. Somebody clearing a drain in this county is either a registered Sewer and Drain Cleaner or is working under a plumbing licence that names the activity. It is not unregulated work here.
When you hire, the verification route is published and takes one phone call. The plumber or gasfitter must give you their WSSC Water licence number, and the Licensing Office will confirm it on 301-206-8588. The utility publishes its own advice alongside that in three short lines: always inquire before you hire, get a contract in writing, and make them finish half way before you pay.
After the Work Is Done
How a Short Form Permit Inspection Runs
Most residential plumbing work here is done under what the utility calls a Short Form permit, and the inspection that follows it has a published procedure with one condition in it that nobody expects.
- Get the permit number from your plumber
The Short Form permit number comes from the licensed plumber or gasfitter who did the work. It is the reference the inspection is booked against, so ask for it before they leave.
- Call it in yourself
Inspections are scheduled on 301-206-4004, or through the interactive voice response system on 301-206-8383. The householder books it, not the contractor.
- Expect the plumber not to be there
The utility states that in general the plumber or gasfitter who performed the work does not have to be present for a short form inspection. This is normal rather than a warning sign.
- Be there yourself, or send someone
The homeowner or their representative must escort the inspector for inside and backyard inspections. There is no unattended access.
- Put the dog away
Published as a flat rule rather than a courtesy: inspectors will not enter yards or homes where dogs or animals are unattended. An unsecured animal ends the visit before it starts.
A Dated Rule With a Live Consequence
Houses Permitted Between 2007 and 2009 Carry an Annual Obligation
WSSC Water adopted the International Plumbing and Fuel Gas Codes in 2007. Residential permits issued between 2007 and 2009 required a testable backflow assembly on the fire sprinkler system. It was tested at installation and a WSSC Water test tag carrying the test date was attached, and by code that assembly has to be tested every year since.
The code has moved on. It now allows a non-testable ASSE 1024 device for residential fire sprinkler protection, and homeowners may elect to replace the testable assembly with one. If a plumbing contractor removes the old assembly and fits the new device, a Short Form permit is required for that work. If the homeowner does the swap themselves, they must contact the cross-connection office to have the testable assembly taken off the WSSC backflow records, which is also what stops the past due letters arriving for a test on a device that is no longer there.
Two other annual obligations sit alongside it. Permits issued for sub-meters with backflow preventers on lawn irrigation systems require an annual test, and the utility recommends doing it in spring before the system is operated for the season. More broadly, all testable backflow preventers must be tested annually to keep the drinking water in the house safe.
On the City Side of the Line
What Still Needs a Gaithersburg Permit, and What Does Not
Even with plumbing carved out, plenty of work at a Gaithersburg address is a city matter and the boundary is published. Permits are not required for routine maintenance or cosmetic updates such as painting, re-shingling a roof, or replacing windows of the same size and style, with one exception the city states plainly: those exceptions do not apply to properties in the Historic District.
Permits are required for constructing, enlarging, altering, moving or demolishing any structure, for all electrical, mechanical or HVAC, fire protection and site development work, for tree removal, for signs, for sheds, decks and patios that alter the existing drainage pattern, and for interior remodeling. A use and occupancy permit is required for all commercial businesses including new businesses and name or ownership changes, and a commercial space may not be occupied until that permit is issued and the field inspection is approved.
Two procedural details save time. All inspection requests must be received before 12 p.m. on the preceding business day, and the city has stopped taking inspection scheduling on its automated inspection line, so booking is online only. Permits and Inspections sits at City Hall, 31 South Summit Avenue, on 301-258-6330, Monday to Friday 8 AM to 5 PM.
What This Means on a Job
How the Split Changes a Plumber Gaithersburg MD Service Call
Three practical consequences follow. A licence number is a real, checkable thing here rather than a claim, and it is checked with WSSC Water rather than with the city or the state. Sewer and drain cleaning is licensed work in this county, not an unregulated sideline. And a gas water heater swap is expressly on the must-be-licensed list, so it is never a homeowner job at this address regardless of anybody confidence with a wrench.
Water heater repair is the clearest example, because a gas water heater replacement is named in the utility own list of work requiring a licensed plumber or gasfitter. Repiping is on that list too, under the heading of interior re-piping, and so are water and sewer service line repairs and replacements, which covers sewer line repair.
Drain cleaning sits inside the licence rather than outside it here, which is unusual and worth knowing. Hydro jetting answers a line coated along its length, leak detection and burst pipe repair cover supply pipework that has failed, and emergency plumbing covers the first hour. We publish no response time for Gaithersburg, because a number typed into a web page helps nobody standing in water.
The other Maryland page on this site covers Baltimore, which sits outside the WSSC district entirely and runs a different arrangement, so nothing on this page carries across to it.
Where We Work
Gaithersburg Neighbourhoods and Corridors
These are the parts of Gaithersburg and its immediate edges that people name when they book. They range from the older centre to the newer planned districts on the west side, which is a genuine difference in pipe age and material.
Gaithersburg Plumbing Questions, Answered Straight
One trade missing from three city lists, a licence ladder counted in thousands of logged hours, and an inspection rule about the dog.
No. The city permit catalogue covers building, deck, electrical, fence, garage, gazebo, improvement, mechanical, shed, solar and swimming pool permits, and its permitting division describes its own scope as building, electrical, mechanical, fire systems, grading and sediment control, forest conservation, new road construction, storm drains and stormwater management. Plumbing appears in none of those lists, and no plumbing code appears on the city adopted code list either. Plumbing permits come from WSSC Water.
WSSC Water, the bi-county utility serving Montgomery and Prince George county. It issues apprentice, journeyman and master licences for plumbing and for gasfitting, plus a separate sewer and drain cleaner registration, and it publishes what each level authorises. Exams are administered by PSI. The city licenses electricians itself but publishes no equivalent requirement for plumbers, because plumber licensing is not a city function here.
Ask for the WSSC Water licence number, which the utility states the plumber or gasfitter must provide, then call the Licensing Office on 301-206-8588 to verify it. The utility publishes its own hiring advice alongside that: always inquire before you hire, get a contract in writing, and make them finish half way before you pay.
No. Gas water heater replacement is named explicitly in the utility list of work that must be performed by a WSSC Water licensed plumber or gasfitter, along with furnace replacement, gas appliance replacement and any other fuel gas work. The same list also captures new home construction, water and sewer service line repairs and replacements, and interior re-piping.
Some, and the boundary is written in section 106.9 of the Plumbing and Fuel Gas Code. We have not read that section, so this page does not state what it contains, only that it exists and that it is where the homeowner limit is defined. Everything on the must-be-licensed list sits outside it. Where a permit is required, the application must go through the online ePermitting system, as paper applications are no longer accepted.
A minimum of 7,500 hours of work experience in the plumbing trade, worked under the direction and control of a WSSC licensed Master Plumber or Master Plumber and Gasfitter, plus a current cross-connection backflow certification which is required of plumbing applicants only. A journeyman gasfitter needs 3,750 hours and no backflow certificate is named for that route. A master needs a further 3,750 hours as a journeyman on top.
Yes, which is unusual. Sewer and drain cleaning services are written into the plumbing licence at apprentice, journeyman and master level, and there is also a standalone Sewer and Drain Cleaner registration requiring a minimum of 3,750 hours under a licensed cleaner or master plumber, written statements from employers, and referral evidence from at least three people. A journeyman plumber qualifies for the registration in lieu of those hours.
Generally no. The utility states that for a short form inspection the plumber or gasfitter who performed the work does not have to be present. You do. The homeowner or a representative must escort the inspector for inside and backyard inspections, and the utility states flatly that inspectors will not enter yards or homes where dogs or animals are unattended.
That has a specific and documented cause here. Residential permits issued between 2007 and 2009 required a testable backflow assembly on the fire sprinkler system, and by code it must be tested annually. The code now allows a non-testable ASSE 1024 device instead, and where a homeowner has swapped it themselves, the utility requires them to contact the cross-connection office so the old assembly is removed from the backflow records. Doing that is what stops the past due letters. Montgomery County cross-connection is on 301-206-7932.
Everything except plumbing, essentially. Building, electrical, mechanical and fire protection permits, site and grading work, tree removal, signs, interior remodeling, and sheds, decks or patios that alter the existing drainage pattern. Plus stormwater, funded by the Stormwater Program Fee formerly known as the Water Quality Protection Charge, and Public Works with its nearly 93 miles of city maintained streets. It also requires snow and ice cleared from abutting public sidewalks within 12 hours of the last precipitation.
Routine maintenance and cosmetic updates, which the city gives as painting, re-shingling a roof, and replacing windows of the same size and style. One exception is stated clearly: none of those exceptions apply to properties in the Historic District. Anything that constructs, enlarges, alters, moves or demolishes a structure needs a permit, as does all electrical, mechanical, fire protection and site development work.
Yes, and it makes this the cleanest location page on this site. The keyword data behind it holds 50 rows, of which 30 carry an explicit Maryland token worth 59 per cent of the volume, and not one single row carries a competing state token. A substring test and a word boundary test return exactly the same 50 rows, so there is no longer place name containing the word and no shorter one hiding inside it. The international check returns nothing.
Ask for the Number
Plumber Gaithersburg MD Work Done Under a Verifiable Licence
In most of the country a plumbing licence is a claim you have to take on trust. In this county it is a number, held by a named utility, confirmed over the phone in a minute on 301-206-8588. That is a rare thing and it is worth using, on us and on anybody else. Ask which permit your job needs, ask who is pulling it, and ask for the licence number before the work starts rather than after.
Sources for the residential and general permit catalogues, the permitting division scope sentence, the electrician licensing statement, the adopted codes and standards list current as of 23 October 2022, the no-permit maintenance list and its Historic District exception, the use and occupancy requirement, the inspection scheduling deadline and the online-only change, the fraud warning, and the City Hall address, phone and hours: the City of Gaithersburg Permitting and Inspections pages. That host refuses ordinary automated requests, so those pages were read through a browser engine after first confirming the site identifies itself as the City of Gaithersburg.
Sources for the nearly 93 miles of city maintained streets, the street, sidewalk, sweeping, lighting, snow and recycling services, the 12 hour sidewalk clearing rule and the Public Works address and hours: the City of Gaithersburg Public Works page. Sources for the Stormwater Program Fee and its former name, the Potomac River and Chesapeake Bay position and the dam safety note: the City of Gaithersburg Stormwater Management Program page.
Sources for the licence types and what each authorises, the 7,500 and 3,750 hour requirements, the cross-connection certification condition, the reference and payroll documentation requirements, the out-of-district notarised letter rule, the sewer and drain cleaner registration and the PSI examination arrangement: the WSSC Water Plumber Information and Licenses page.
Sources for the statement that most plumbing projects must be done by a licensed plumber or gasfitter, the list of work requiring a licence, the hiring advice, the licence number verification route, the short form permit inspection procedure including the unattended animals rule, the section 106.9 reference, the 2007 code adoption, the 2007 to 2009 testable fire sprinkler backflow requirement, the ASSE 1024 alternative, the records removal and past due letter point, the irrigation sub-meter annual test and the cross-connection office numbers: the WSSC Water Information for Homeowners and Permit Services pages.
No fee amount of any kind is quoted on this page. WSSC licence and examination fees live in an approved fee schedule that was not opened, water and sewer rates and the system development charge live on a rates page that was not opened, and city permit fees live in the FY 2027 Schedule of Fees and a fee calculator that were not opened. The stormwater fee amount and its calculation are not stated. The contents of section 106.9 are not stated because that section was not read.
No response time, crew count or office of ours is stated for Gaithersburg, and no count of licensed plumbers in the county is given. Codes, fees, licence requirements and permit catalogues change, so confirm current requirements with the City of Gaithersburg or WSSC Water before relying on anything above.