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FAQs - Development Services - Building & Planning
Streets and Utilities

Q: What is the location of the sewer main serving my property?

A: There are sewer maps available at City Hall in the Development Services Department showing the locations of the sewer mains. City staff can assist you in reviewing these maps.


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Q: Is there a sewer service or stub available in front of my property?

A: There are sewer maps available at City Hall in the Development Services Department showing the locations of the sewer mains and stubs. The City also has files containing records for many of the sewer services that have been constructed. City staff can assist you in reviewing these maps and records.


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Q: When will my street be repaved?

A: Streets are paved based on a street condition survey performed by the City's Street Engineer every two years. For more information, refer to "How are street projects prioritized?”


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Q: Why doesn’t the City install stop signs at my intersection?

A: 

A stop sign is one of our most valuable and effective traffic control devices when used at the right place and under the right conditions. Using stop signs to control speeding is effective only in the immediate vicinity of the stop sign, and frequently speeds are actually higher between intersections. Federal guidelines indicate when such controls become necessary. STOP signs (and other traffic signs and signals) are installed based on guidelines established in the Manual on Uniform Traffic Control Devices (MUTCD).



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Q: When is a Right of Way Use (formerly Street Use) Permit required?

A: A Right of Way Use Permit is required whenever you do work in street right of way including paving, patching, graveling, utility work, and anything that impacts the flow of traffic (vehicles, bicycles, and/or pedestrians). If you are not sure if you need a permit, a Development Services representative at (206) 275-7605.


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Q: What is a right of way encroachment?

A: The Mercer Island Unified Land Development Code Section 19.06.060 defines encroachments and criteria used to determine when an encroachment is allowed. In most cases, encroachments are not allowed. Some examples of encroachments in right of way include rockeries, walls, fences, various structures, signs, large trees, landscape lighting, and irrigation systems. The City Engineer reviews encroachment requests and determines whether they are acceptable or not. When determined an acceptable encroachment, the requestor must pay fees associated with executing an encroachment agreement and obtaining a Right of Way Use Permit.


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