The DNREC Groundwater Discharges Section issues licenses for the various professions involved in designing, installing and maintaining on-site wastewater treatment and disposal systems. Licenses are granted under the state’s on-site systems regulations and with input from the On-Site Systems Advisory Board.
Licenses are issued in eight different classes, focused on different aspects of systems design, installation and maintenance. All licenses require submission of a completed application and review by the On-Site Systems Advisory Board. These licenses must be renewed annually.
Any work performed on an on-site system treatment system should be done by a licensed contractor approved by the On-Site Systems Advisory Board.
Property owners who wish to conduct their own percolation testing, system design or system installation on their own property and for their own use my apply for a temporary Class A, B, or E license.
Note: With the cancellation of the annual DOWRA Conference, DNREC recommends training opportunities provided by the Delaware Rural Water Association.
All on-site wastewater treatment and disposal system licensees are listed on the Delaware Open Data Portal in a data-set that is updated weekly.
Class A Licenses authorize the performance of percolation tests.
Class B licenses authorize the design of conventional on-site wastewater treatment and disposal systems which utilize gravity distribution systems for seepage beds and seepage trenches and certain standardized pressure distribution and disposal systems.
Class C licenses authorize the design of conventional, alternative and experimental on-site wastewater treatment and disposal systems and all pressure distribution systems.
Class D licenses authorize the performance of site evaluations.
Class E licenses authorize the construction and installation of wastewater treatment and disposal systems.
Class F licenses authorize the removal, transportation or disposal of the solid and liquid contents of septic tanks, cesspools, grease traps, seepage pits, holding tanks, portable toilets or other wastewater treatment or disposal facilities as specified and required under the Regulations.
Class H licenses authorize the inspection, investigation and data collection to make determinations regarding the operational condition of on-site wastewater treatment and disposal systems.
Class I licenses authorize the inspection of all new, replacement and repairs of small gravity on-site wastewater treatment and disposal systems, gravity on-site system component replacements and cover inspections for above grade gravity on-site wastewater treatment and disposal system.