State guide
Delaware
Delaware’s Office of Drinking Water publishes the state lead-and-copper program page and revolving-fund information, and utilities are making their inventories public.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- State lead service line page
- Official page →
Official resources in Delaware
State lead-and-copper page with Delaware guidance and links used by water systems and residents.
State revolving-fund page residents can use to see funding programs and project resources tied to lead service lines.
Official Wilmington page linking residents to the city’s updated inventory map and private-line survey.
Municipal Services Commission inventory page showing public/private side information for New Castle customers.
Key facts for Delaware
- Delaware ODW guidance says inventories must include both utility-owned and customer-owned service line portions.
- Delaware ODW guidance says service line inventories must be made available to the public.
- Wilmington submitted its initial inventory in October 2024 and says it is developing a fair and equitable replacement plan.
- Wilmington says it is reviewing federal and state funding opportunities for future lead-rule compliance efforts.
- Wilmington launched an updated service-line map on March 17, 2026.
- MSC’s inventory page explains that the public side is utility-owned and the private side runs into the resident’s home.
What to do next
- Use the state Lead and Copper Rule page first, then check your utility’s inventory page or survey for your address.
- If you are in Wilmington, complete the city’s private-line survey so the utility can verify the customer-owned side.
- If your town announces a DWSRF-funded lead project, ask whether private-side replacement is included before authorizing any private work.
Helpful guides
- Who pays to replace the private side of a lead service line?
- Lead service line replacement grants, reimbursements and loans
- How to tell if your water service line is lead
- The Lead and Copper Rule Improvements: what homeowners need to know
Lead line cost-share estimator →