Rockville, MD · Serving the Potomac, MD service area
Plumber in Rockville, MD: City Water or WSSC? Your Utility Decides Who to Call First
In Rockville, whether the city or WSSC sends your water bill changes the number you call for a backup, a main break or a permit. This page sorts that out before a plumber is sent.
Which utility serves your Rockville address decides who you call first
Rockville is unusual among the towns near Potomac. The City of Rockville runs its own water and sewer for about 70 percent of the city, roughly 13,000 accounts. Every other Rockville address is served by WSSC. The two systems have different hotlines and different rules, and a plumber can lose an hour working out which one applies.
Look at your water bill. If the city sends it, you are on the city system. If WSSC sends it, you are on WSSC. The city also publishes a water service provider map you can search by address.
| Situation | City-served address | WSSC-served address |
|---|---|---|
| Water main break in the street | City Public Works hotline, 240-314-8567 | WSSC emergency line, 301-206-4002 |
| Sewer backup in the house | Call the city hotline before a plumber | Call a plumber registered with WSSC first |
| Leak inside the house | Owner's plumber | Owner's plumber |
| Water heater permit | City of Rockville permit office | WSSC, per the city's water heater guide |
| Brown water at all taps | City Public Works | WSSC |
A leak inside the house is yours either way. Locating a leak inside the walls explains how a plumber tests the supply side without cutting drywall.
Backup in the basement: why the city asks for the call before the plumber
On a city-served line, the City of Rockville says to call its 24-hour Public Works hotline before contacting a plumber. The city then investigates whether the blockage is in the portion of the sewer it maintains. If it is not, the owner is told to call a registered master plumber.
So the first call decides who looks at the line first. If the address is on WSSC, WSSC's rule is the reverse: it takes blockage reports only from registered plumbers, so the plumber makes the call.
- Stop running water, flushing and using the dishwasher.
- Find the source: only the lowest drain, or every fixture.
- Call the city hotline if the address is city-served.
- Photograph standing water and the cleanout before anything is moved.
- Ask the plumber to write down where the blockage sits.
If the blockage is in the owner's lateral, fixing the house sewer line is the next step. For a repeat clog in the same run, jetting the full line clears more than a cable can.
Backup or leak happening now?
Shut off the water to the affected fixture and call. Give us your street address.
Documenting a backup for the city's claims policy and your insurer
The City of Rockville has a claims policy for sewer backups, water main breaks and stormwater discharge that can provide up to 2,500 dollars toward documented remediation costs. It applies when the city's line was involved, and claims go to [email protected].
The city's own page adds two cautions: utilities are rarely held liable for backups, and backup coverage usually comes as an endorsement on a homeowner's policy. Check your policy before an emergency, not during one.
- Date-stamped photos of the water level and the damage.
- The plumber's written report, including where the blockage was.
- Receipts for cleanup and for drying equipment.
- The date and time of your call to the city hotline.
After the line is clear, drying out the affected rooms should start quickly, and the receipts belong in the same folder.
Replacing a water heater in Rockville: permit path and the Tuesday desk
Plumbing permits for Rockville addresses go through the City of Rockville, and the city requires a City of Rockville license plus a Maryland license. Owners cannot act as their own contractor. The city's water heater guide says addresses on WSSC water get the permit from WSSC instead.
For residential water heaters the city runs an Express process that needs no drawings. Applications are accepted Tuesdays from 8:30 a.m. to 12:30 p.m., and a complete application with fees paid by 12:30 p.m. is reviewed the same day. Projects tied to a violation case or a building permit are not eligible. A same-day swap on another weekday only works if the plumber pulls the permit ahead of time.
- Which office pulls the permit: the city or WSSC?
- Does the plumber hold both the city and state licenses?
- When is the inspection, and who is home for it?
- Is the old heater being hauled away?
Compare options in choosing a replacement water heater, or see whether repairing the tank you have still makes sense.
Rockville on the map: the county seat about 5 miles from Potomac
Rockville is about 5.1 miles from Potomac and is the Montgomery County seat. Rockville addresses are on two utilities, so give your street address when you call.
Basement water: a broken pipe, or runoff at the foundation?
The city's stormwater guide makes a distinction homeowners often miss. Damaged private drainage systems are the owner's to repair, and downspouts should send water at least 6 feet from the house. Water that appears after rain is not a plumbing problem.
Water that appears on dry days is. Check the meter: close every fixture and see whether the dial still moves. If it does, there is a leak in the supply, and shutting off and fixing a split pipe applies. If it does not, ask a drainage contractor about the foundation.
Older mains and private lines: what 55 percent built before 1970 means
The Rockville 2040 plan reports that about 94 miles, or 55 percent, of the city's water distribution lines were built before 1970. It also reports no known lead pipe in the city-owned system and recommends that lead in a private service line be removed at the owner's expense.
That puts the line between public and private in plain terms: the city checks its pipes, and you check yours. If your house has repeated pinhole leaks or rust-colored water from one line, ask the plumber what the pipe is made of. Replacing the pipes is the answer only when the failures keep coming, and a single leak is a repair.
Nearly half of Rockville households rent, since the owner-occupied rate is 52.6 percent. Tenants should photograph the problem and report it to the landlord in writing before calling.
Rockville utility, backup and permit questions
How do I know whether the City of Rockville or WSSC is my water utility?
The city provides water and sewer to about 70 percent of Rockville, and WSSC serves the rest. The city publishes a water service provider map, and your water bill shows who sends it. Check before you call about a main or a backup.
Who do I call first for a sewer backup in Rockville?
On a city-served line, the city asks you to call its 24-hour Public Works hotline at 240-314-8567 before you call a plumber. On a WSSC-served address, WSSC says to call a plumber registered with WSSC first. If you are not sure which applies, call the hotline.
Does the city pay for backup damage?
The city's claims policy can provide up to 2,500 dollars toward documented remediation costs when its line is involved. The city also says backup coverage usually needs an endorsement on a homeowner's policy, so check your policy as well.
I rent in Rockville. Who handles a plumbing emergency?
Report it to your landlord or property manager in writing first and photograph the damage. Close the fixture shutoff if you can. If you cannot reach anyone and water is spreading, shut off the water at the main and call.
Pipe or drain failing in Rockville?
Call with your street address and say whether the city or WSSC bills your water. We tell you whether we can send a plumber.