State guide
Delaware
Delaware’s drinking water program is the Division of Public Health’s Office of Drinking Water, which hosts the state Lead and Copper Rule page and links to the public transparency dashboard. In the large-city utility pages located, Newark, Wilmington, and Dover all show a common split: the city or utility is responsible up to the curb stop or public side, and the owner is responsible from there to the building or for undedicated private infrastructure.
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
- Usually yes: the official Newark, Wilmington, and Dover pages found all place public responsibility to the curb stop or public side, with the owner responsible from there to the building or for private undedicated service.
- State drinking water program
- Delaware Division of Public Health, Office of Drinking Water
- State lead service line page
- Official page →
- Permits for repair or replacement
- No statewide private-side repair permit rule was found on Delaware ODW’s lead pages; local pages indicate local plumbing/building permits may apply, and Dover’s handbook points owners and contractors to Public Services - Inspections for plumbing permits.
- Assistance programs
- No statewide private-side lead replacement assistance page was found; local help found includes Wilmington free lead sampling, Wilmington utility bill assistance, and Dover’s water leak adjustment policy.
Official resources in Delaware
State drinking water program homepage with program contacts, regulations, and lead-service-line links.
State lead and copper page with inventory guidance and homeowner sampling directions.
Official map page showing customer-owned and utility-owned sides of each service line.
Official Newark page stating exactly where city responsibility ends and property-owner responsibility begins.
Official Dover handbook explaining repair responsibility, contacts, and related permitting offices.
Key facts for Delaware
- Delaware ODW says service-line inventories must include both the water-system-owned and customer-owned parts.
- Newark says the City maintains water service lines from the water main to the curb stop valve.
- Newark says the line from the curb stop valve to the building is owned and maintained by the property owner.
- Wilmington’s inventory map says the left side is customer-owned and the right side is owned and maintained by Wilmington Water Utility.
- Dover says it repairs water services between the main and the curb stop in specified cases.
- Dover says property owners must repair undedicated water utility infrastructure, including service lines, at their expense.
Utility water service line rules in Delaware
| Utility | city | phone | Details |
|---|---|---|---|
| Delaware Division of Public Health - Office of Drinking Water Kent County | Dover | Not published* | State drinking water program contact for Office of Drinking Water questions. |
| Wilmington Water Utility - Water Quality Lab New Castle County | Wilmington | Not published* | Handles free lead sample requests and water quality questions. |
| Wilmington 311 New Castle County | Wilmington | Not published* | General city contact for Wilmington Water questions and utility assistance outside city limits. |
| City of Newark Public Works and Water Resources Department New Castle County | Newark | 302-366-7000 | City water department contact; Newark’s lead page uses this department for drinking-water and service-line matters. |
| City of Dover Customer Services Kent County | Dover | Not published* | Utility billing office; publishes water adjustment policy and customer utility contacts. |
| City of Dover Water/Wastewater Department Kent County | Dover | Not published* | Handles water and sewer utilities; Dover contact materials point this office to water and sewer utility matters. |
* Not published: the official page doesn't list it. Call the office to confirm before you rely on it.
What to do next
- Use the state ODW page first to find Delaware’s lead-service-line guidance, then check your city utility map or handbook for the ownership split.
- In Wilmington, look up your address on the service line inventory map before hiring a plumber so you know the public-side and customer-side materials.
- In Dover, ask Customer Services and Public Services/Inspections about leak adjustments and any plumbing permit requirements before private-side replacement work starts.
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 Delaware, 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 Delaware's population center, for comparison only):
- American Water Contract Services Camden Operations Center, New Jersey · about 52 miles
- American Water Emergency Line, New Jersey · about 52 miles
- City of Annapolis Water Service Line Program, Maryland · about 55 miles
- Call to confirm Ask the official office. They have the current local rule, fee and form.Delaware Office of Drinking Water
Website →Phone: (302) 255-9040 (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 Delaware 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 →