Sussex County operates numerous sanitary sewer districts and one water district. System connection charges (impact fees) are collected in these areas prior to the issuance of building permits. Contractors must present a copy of the proposed plans for commercial buildings to the Permits Division in the Engineering Department (3rd Floor of the County Administrative Offices) for their review. Plans are not required for detached single family residential structures.

The County's water and sewer service areas are included in the Sussex County Unified Sewer District.