DJK was adding a bedroom to an existing residence and needed a wastewater permit from Vermont’s environmental agency. The agency has a “presumptive isolation zone” around potable water supplies and septic systems in which a property owner is presumed to be barred from doing anything sewage related. In this case, the isolation zone for DJK’s property crossed over onto the property of their neighbors, the Crowleys.
The agency granted DJK the permit, which contained a provision that not only no sewage-related construction could take place in the isolation zone, but that “[n]o buildings” could be construction which “might interfere with the operation of a wastewater system or potable water supply[.]” Remember, the isolation zone was located partially on the Crowley property.
The Crowleys were not very appreciative, so appealed (to a Vermont trial court sitting as the Environmental court). They argued that the permit was invalid because it worked a

