A listing of permits for the installation of small (individual structure) and large (multi-structure) septic systems. This dataset includes information such as location (tax parcel), size and capacity, date, and permit number.

Database of Notices of Intent (NOI) to apply for coverage under the National Pollutant Discharge Elimination System (NPDES) general permit for storm water discharges associated with construction activity. A record of planned construction activities that might cause storm water discharges.

Contains information about toxic chemicals in Delaware. It is based on annual reports from facilities that use or manufacture those chemicals. DNREC publishes annual state Toxics Release Inventory (TRI) reports and the Environmental Protection Agency (EPA) publishes national TRI reports. Annual reports are published at the end of each calendar year and cover the previous calendar year.

A listing of professionals issued licenses for eight classes of professional activity related to wastewater treatment and disposal systems.