Boise Sewer Permit Process Explained

Navigating the permit process for sewer work in Boise can feel opaque if you have never done it before. Most homeowners never interact with the City's Planning and Development Services department until they are facing an urgent repair and suddenly discover that paperwork is required before a shovel hits the ground. This guide demystifies the process so you know what to expect, what it costs, and how long it takes.

When Do You Need a Boise City Plumbing Permit?

In the City of Boise, a plumbing permit is required for any work that involves modifying, replacing, or installing sewer piping. This includes full sewer line replacements, partial replacements, new sewer connections for additions or ADUs, and trenchless pipe lining or bursting. Minor maintenance work such as drain cleaning, snaking, and camera inspections does not require a permit. If you are unsure whether your specific project needs a permit, call PDS at (208) 608-7150.

Step-by-Step: The PDS Portal Process

Step one: Your licensed plumbing contractor submits a permit application through the City of Boise's online PDS portal. The application includes a site plan showing the proposed work, pipe routing, and connection points. Step two: PDS reviews the application, which typically takes 3 to 10 business days for straightforward residential sewer work. Step three: Once approved, the permit is issued and posted at the job site. Step four: Work begins per the approved plan. Step five: Your contractor requests an inspection before backfilling the trench. The city inspector verifies materials, slope, bedding, and connections. Step six: Once the inspection passes, the permit is finalized and the trench can be closed.

Connection Fees and Impact Fees: What You Owe the City

If your project involves a new connection to the city sewer system—such as a new home, an ADU, or a septic-to-sewer conversion—you will owe connection fees in addition to your plumbing permit fee. Connection fees consist of two components: trunk fees (which fund capacity in the city's water renewal infrastructure) and treatment fees (which fund wastewater processing). These are one-time charges paid to the City of Boise, separate from your contractor's bill.

Some properties also owe assessment fees, which cover the cost of constructing the sewer pipe from the main to the right-of-way. Assessment fees apply primarily to previously undeveloped lots, lot splits, and properties that have never connected to the sewer system.

The 2024 to 2026 Connection Fee Increases: What Changed

The City of Boise updated its connection fees beginning October 1, 2024, for the first time since 2014. The increase is being phased in over three years to full cost-of-service levels, with adjustments continuing through 2026 and beyond. Both residential and commercial connection fees have risen to reflect the current cost of sewer and water renewal infrastructure. If you are planning new construction, an ADU, or a septic conversion, factor these updated fees into your budget. Contact the city at (208) 608-7150 for current fee schedules, as they are adjusting periodically.

The Inspection Timeline: What Happens When the City Inspector Arrives

The city inspector's job is to verify that the installed work meets Idaho State Plumbing Code requirements and the City of Boise's standards. They will check pipe material and diameter, verify slope meets the minimum 2 percent grade requirement, inspect bedding material and compaction, confirm proper connections and clean-out placement, and ensure the work matches the approved permit plan. Inspections are typically scheduled within 24 to 48 hours of request, though backlogs can add time during busy construction seasons. Your contractor should coordinate the inspection—you do not need to be present, but the trench must be open and accessible.

Frequently Asked Questions