State guide
Maryland
Maryland’s drinking-water and lead-service-line oversight sits with the Maryland Department of the Environment’s Water Supply Program. Maryland utilities publish different handoff points—property line, coupling connection, or interior-wall-to-property-line responsibility—so homeowners need to check the local utility’s rule, not assume one statewide split.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Who usually owns the water service line
- Maryland does not use one uniform homeowner split statewide; large utilities commonly place public responsibility to the property line or coupling connection, with the owner responsible from there into the house.
- State drinking water program
- Maryland Department of the Environment, Water Supply Program
- State lead service line page
- Official page →
- Permits for repair or replacement
- Permit rules are local or utility-specific on the pages found: Baltimore’s plumbing code says no plumbing work may be undertaken before a permit is issued unless specifically excepted, and WSSC says Permit Services handles service connections on private property.
- Assistance programs
- No statewide private-side replacement grant page was found; Baltimore publishes Water4All bill assistance and official materials for optional exterior line protection plans, while WSSC publishes bill-assistance and permit-service pages rather than a private-side replacement grant.
Official resources in Maryland
Official state lead and copper page with Maryland service-line inventory and lead-service-line replacement program materials.
Maryland regulation page defining utility-side service-pipe elements such as the segment from main to curb stop or outdoor meter outlet.
Official utility FAQ stating the homeowner is responsible from the house to the property line.
Official city program page showing Annapolis ownership to the coupling connection and customer ownership from the house to that connection.
Key facts for Maryland
- Maryland’s Lead and Copper Rule page includes a lead service line replacement program.
- COMAR describes a service pipe from the main to the curb stop or outlet of an outdoor meter setting.
- WSSC says the homeowner is responsible for the water service from the house to the property line.
- WSSC says it will investigate underground leaks to determine whether they are on or off property.
- Annapolis says the customer owns the water service line from the house to the coupling connection.
- Baltimore says homeowners are responsible from the exterior wall of the home to the property line.
Utility water service line rules in Maryland
| Utility | city | phone | Details |
|---|---|---|---|
| Maryland Department of the Environment Water Supply Program | Baltimore | Not published* | State drinking-water oversight program and Maryland lead-and-copper information page. |
| WSSC Water Emergency Service Center Prince George's County | Laurel | 301-206-4002 | Utility investigates underground or service leaks to determine whether the leak is on or off property. |
| WSSC Water Permit Services Prince George's County | Laurel | 301-206-4003 | Permit-services page for service connections on private property and ePermitting information. |
| City of Annapolis Water Service Line Program Anne Arundel County | Annapolis | 410-263-7949 | Program page for service-line material inventory, self-reporting, and Annapolis ownership split at the coupling connection. |
| Baltimore Water4All Baltimore City | Baltimore | Not published* | City bill-discount program for eligible Baltimore City residents paying water and sewer charges directly to the city. |
| City of Baltimore Plumbing Permit Rule Baltimore City | Baltimore | Not published* | Baltimore code page stating plumbing work generally needs a permit before work begins. |
* Not published: the official page doesn't list it. Call the office to confirm before you rely on it.
What to do next
- Use your local utility’s map or survey tool to confirm your service-line material and ownership split before planning repairs.
- If you are in WSSC territory, contact Emergency Service first for underground leaks so the utility can determine whether the leak is on or off property.
- If you are in Baltimore or Annapolis, check city permit rules before plumbing or service-line excavation.
Not seeing your utility or county?
We list a utility only when an official government page publishes its rules. If yours isn't in the table above, it may not publish them online yet. Here's what to use instead, in order:
- General Start with the statewide information above. It applies across Maryland, but cities and counties can add their own steps, fees or deadlines.
- Closest verified Nearest places where we have verified local data outside this state (distance from Maryland's population center, for comparison only):
- Lead Free DC Customer Response Team, District of Columbia · about 19 miles
- DOEE Lead Pipe Replacement Program Information, District of Columbia · about 19 miles
- DC Department of Buildings, District of Columbia · about 19 miles
- Call to confirm Ask the official office. They have the current local rule, fee and form.Maryland Department of the Environment - Lead and Copper in Drinking Water
Website →Phone: (410) 537-3702 (as listed on that page, checked Oct 4, 2026)Your city or county office: Local governments →Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Maryland page on USA.gov can point you to the right office. - Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.
Helpful guides
- Who is responsible for the water line to your house?
- The curb stop, meter and property line, explained
- Water line leak in your yard: what to do
- Water service line replacement costs
Water line responsibility check →