Municipal Department
Wilmington Water Utility
Serving Wilmington and Northern New Castle County
Population served
Approximately 110,000 drinking-water customers; the wastewater system treats service-area flows for approximately 450,000 residents in Wilmington and Northern New Castle County.
State system code
FIPS 10
Billing frequency
Monthly; Wilmington Water bills water, sewer, stormwater, and facilities-management charges on a recurring monthly bill.
Provider briefing
How this utility’s billing works
Wilmington Water Utility operates as a municipal department serving Wilmington and Northern New Castle County. Customers should use the provider’s current account-specific bill and official customer-service instructions as the final authority for deadlines, balances, and service requests.
The published water-rate framework is described as Usage-based rates differentiated by inside-city versus outside-city service area, property classification, and meter size. The FY2026 budget applies a 5.5% increase to inside-city water, inside-city sewer, and outside-city water charges; the exact current tariff is maintained in the city’s ordinance/rate materials.. Bills are generated monthly; wilmington water bills water, sewer, stormwater, and facilities-management charges on a recurring monthly bill., and a typical residential cost reference is A dedicated this detail was not publicly posted. For an exact 2026 total because the public rate pages calculate charges by location, property class, meter size, and usage. The FY2026 budget identifies a typical inside-city residential 4,000-gallon customer and reports that the annual rate action increases that bill by approximately $3.65 per month.. These descriptions are useful planning benchmarks; actual charges can change with meter size, usage, sewer averaging, local taxes, drought stages, or account-specific fees.
Wastewater and sewer calculation
Sewer is included on the monthly Wilmington Water bill and varies with the applicable property classification, service location, meter size, and metered consumption under the current ordinance. The reviewed public pages do not expose a current formula showing a winter average, a fixed percentage of water usage, or a universal residential sewer cap; customers should use the current ordinance and bill detail for the premise-specific calculation.
Meter and infrastructure notes
Wilmington Water partnered with Itron to upgrade customer water meters. The new meters can be read from a greater distance and are intended to improve reading accuracy and operational efficiency. The reviewed current pages do not state a public read interval, hourly transmission schedule, or Itron model; customers should use the bill and customer portal for premise-specific consumption history.
Emergency water support
Report a leak or water emergency
Call 311 within Wilmington or (302) 576-2620 from outside the city for customer and service assistance. After-hours emergency contact is (302) 654-5151 through Wilmington Police non-emergency dispatch; water-quality, low-pressure, and discoloration concerns are directed to (302) 576-3878, with laboratory contact at (302) 571-4158.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Wilmington and Northern New Castle County
Wilmington Water Utility is listed here as a municipal department. The profile separates account actions—such as paying a bill or requesting service—from explanatory material about rates, meters, wastewater, leaks, and delinquency.
Because utility rules can vary by account class, meter size, service address, billing date, and local ordinance, treat the published bill and current provider website as the final authority. Use this profile to locate the correct channel and prepare better questions for customer service.
If your issue is urgent, start with the provider’s emergency number or official payment route rather than waiting for an email response. Keep a written record of calls, confirmation numbers, notice dates, and documents you submit.