If the lot size is adequate to accommodate two dwelling units (for example, within the aquifer: 19,200 square feet x 2 = 38,400 square feet), conversion to a duplex may be permitted using a single septic system. The septic system must be large enough to accommodate the full occupancy of the proposed duplex, which is very likely to require construction of a new septic tank and leaching field.
Conversion of a single family home to a duplex on a lot that is sized only for a single family dwelling will not be approved by GEPA pursuant to 22 GAR §12105(e) & (f).
In Guam, the use of onsite wastewater disposal systems commonly referred to as ”septic systems,” is regulated through a number of laws and regulations. These laws and regulations cover specific requirements for the permitting, design and construction of septic systems in Guam. Guam EPA has developed this FAQ to help you understand the application of various requirements to the design, permitting, and construction of a septic system for a single family dwelling.
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