Do I need a plumbing permit in Montgomery County Maryland? If you’re planning any plumbing work at your home or business, this is one of the most important questions to answer before you start. The short answer is: yes, most significant plumbing work requires a permit — but it may not work the way you think.
In Montgomery County, plumbing permits are not issued by the county government. Instead, they’re issued by the Washington Suburban Sanitary Commission (WSSC Water), which oversees water and sewer services for both Montgomery and Prince George’s Counties.
Who Issues Plumbing Permits in Montgomery County Maryland?
Many homeowners are surprised to learn that Montgomery County itself doesn’t handle plumbing permits. That responsibility falls to WSSC Water. If you’re doing any significant plumbing work — from replacing a water heater to installing new water lines — the permit must come from WSSC, not the county.
Your plumber must be licensed by WSSC to pull permits and perform inspected work in the county. This is why hiring a WSSC-licensed plumber matters. An unlicensed contractor cannot legally obtain permits or have work inspected — and that puts you at risk.
What Plumbing Work Requires a Permit in Montgomery County, MD?
Here’s a breakdown of common plumbing projects and whether they typically require a permit from WSSC:
| Plumbing Task | Permit Required? |
|---|---|
| New water or sewer service lines | ✅ Yes |
| Whole-house re-piping | ✅ Yes |
| Installing a gas water heater or furnace | ✅ Yes (Gas Permit) |
| Backflow preventer installation or replacement | ✅ Yes (WSSC approval) |
| Toilet or faucet replacement (like-for-like) | 🚫 Usually No |
| Fixing a leak or unclogging a drain | 🚫 Usually No |
| Replacing less than 10% of existing piping | ❓ Possibly Exempt |
Gas Work Requires Special Permits
Gas appliances — including water heaters, boilers, and furnaces — have stricter rules. If you’re replacing or installing any gas-fueled appliance, you are legally required to obtain a WSSC gas permit. The work must also be performed by a WSSC-licensed gas fitter.
This isn’t optional. It’s a safety issue. If work is done without the required gas permit and something goes wrong, your insurance company may deny any related claims. Don’t take that risk.
What About Minor Plumbing Repairs?
Not every job requires a permit. According to WSSC code section 106.2.1, certain minor repairs may be exempt. For example, fixing a leaky pipe or replacing a small section of pipe — less than 10% of the total — may not require a permit.
That said, this can be a gray area. Your plumber should verify whether your specific project qualifies for an exemption before starting any work.
Why Getting a Permit Matters
Even if it seems like extra paperwork, pulling the proper permit protects you in three important ways:
- Safety: Inspections confirm the work meets code and won’t put your health or property at risk.
- Home resale value: Unpermitted work can delay or derail your home sale — buyers and their agents will ask questions.
- Insurance coverage: If a water heater fails and it was installed without a permit, your insurer may deny your claim entirely.
How to Get a Plumbing Permit in Montgomery County
If you hire a licensed WSSC plumber, they will handle the permit process for you. That’s part of what you’re paying for. Here’s what the process looks like:
- Your plumber applies for the permit through WSSC’s ePermitting portal before work begins.
- WSSC reviews the application and issues the permit.
- The plumber completes the work.
- A WSSC inspector comes out to verify the work meets code.
If you’re unsure whether your project requires a permit, you can contact WSSC Permit Services directly at 301-206-4003 or use their onlineePermitting portall.
Summary: Do I Need a Plumbing Permit in Montgomery County Maryland?
If you’re doing any substantial plumbing work in Montgomery County, Maryland — including gas appliance replacement, water service upgrades, re-piping, or backflow prevention work — then yes, you need a permit from WSSC Water. The county doesn’t issue plumbing permits itself.
The safest approach is to hire a WSSC-licensed plumber and let them handle the permit process. That way you know the work is done right, inspected, and fully protected.
Learn More & Get Help
Want to understand how WSSC permits and plumbing regulations affect you as a homeowner? Read our Homeowners Guide to WSSC for a complete overview of what WSSC does, what it regulates, and what you need to know before starting a plumbing project.
Ready to schedule your plumbing work or have questions about whether your project needs a permit? Contact Durance Plumbing today. We’re a WSSC-licensed plumbing company serving Montgomery County and Prince George’s County, and we’ll handle the permits so you don’t have to.