A listing of permits for water wells. The dataset includes information such as location (tax parcel), capacity, date and permit number. Specific location data, for some well types, is redacted per state law.

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.

Counts of waterfowl found in regular aerial surveys of Delaware waterfowl habitat areas.

A map showing locations (where known) 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.

Data on advisories issued for water quality problems in selected recreational water areas.

Provides air quality data from monitoring stations throughout the state. Data available include ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, particulate matter, temperature, wind direction, humidity and wind speed.

Survey data from 1999-2018 which denotes peak spawning occurrences by day and lunar period, proportion of spawning in May (coinciding with shorebird stopovers), average water temperature, index values for female and male crabs per square meter by beach and baywide, the annual sex ratio, and index of abundance per beach.

A listing of professionals issued Class E licenses authorizing them to build and install on-site wastewater treatment and disposal systems.

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

A listing of rebates paid to persons and companies for purchase or lease of alternative fuel vehicles.