Can I convert my house to a duplex if it is served by a septic system?
Can I convert my house to a duplex if it is served by a septic system?
Conversion of an existing single-family dwelling to a duplex may or may not be permissible depending on the size of the lot. See the Section titled “Is my lot size large enough to permit a septic system?” above for more details.
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).
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UPDATED AS OF JULY 18, 2024: Requirements for Septic Systems
Please be advised that the Toilet Facilities and Sewage Disposal Chapter codified in 10 GCA Chapter 48 has been amended through the enactment of Guam Public Law 37-105.
On July 18, 2024, Bill 175-37(COR) as substituted and amended on the floor was signed into law as Guam Public Law 37-105 and is effective upon enactment. As a result of this enactment, certain conditional environmental clearances issued by the Guam Environmental Protection Agency for building permits issued by the Department of Public Works have changed and will now be performed in accordance to this new law and its amended provisions.
Permitting Tips Presentations: Contractors, Home Builders and Property Buyers
In case you missed our Construction & Industry Forum on March 29, 2023, you can click on the links below to access presentations about Guam EPA’s construction permitting process:
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.
Guam Business License & Permit Center Window Hours
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