Corvidae has completed several Environmental Impact Studies (EIS) for developments that are installing their own sewage treatment system. The EIS involves a biophysical assessment, including hydrogeology. Corvidae works with the design engineer to provide all the required details to the Ministry of Environment for approval of the sewage treatment system. Corvidae provides the client with a list of requirements and works with the client to ensure the entire application is complete and the process for approval runs smoothly.

The EIS projects have included sewage discharge to ground and discharge to surface with varying treatment systems (sand filter, peat systems, UV treatment, etc.).