Do you need a drainage permit for yard drainage?

Real local rules show why there is no national yes or no

As of Nov 2026, Fairfax County Land Development Services lists a land disturbance permit and approved grading plan for disturbance at or above 2,500 square feet. It also lists exemptions and tells homeowners to ask staff about their application; that threshold is a local example, not a nationwide safe limit.

Seattle Public Utilities requires side sewer permits for specified connections and changes to drainage side sewers, and separate transportation approval for work in the public right-of-way. A pipe wholly on private land can still be part of a regulated drainage connection.

These examples describe published municipal requirements, not a determination for your property. Your local permit or stormwater office decides which review applies to your project.

Send the permit office a route sketch

Show the collection location, pipe or channel route, proposed outlet, property boundary and area that excavation and equipment access will disturb. Tell staff whether you are replacing an existing line or creating a new discharge point; “yard drain” alone does not describe the work.

• Does this scope need a drainage, grading or trade permit?
• Is this discharge location acceptable, and is connection approval separate?
• Do an easement, floodplain or protected area change the review?
• What plans or inspections are required before the trench is covered?
• Who can apply and perform this particular scope?

For a small surface extension, ask whether that limited change is exempt before assuming a buried system is necessary. Do not use another city’s exemption to decide your own project.

811 and a permit answer different questions

As of Nov 2026, Common Ground Alliance’s 811 guidance calls for notification before digging, waiting the required state period and confirming utility responses. Permit approval does not locate utilities, and utility markings do not approve a discharge connection.

If a contractor will dig, agree who arranges the notification and checks responses before excavation starts. Ask your state 811 center which facilities are covered and what additional locating your property may need; follow the state’s instructions rather than guessing a waiting period.

Make approvals and inspection part of the quote

Use the drainage contractor hiring guide to compare scopes. Require the quote to name who handles plans, permits, inspections, outlet approval and restoration; keep fees and design work explicit instead of assuming they are included in trench pricing.

A blanket “yard drains never need permits” is a reason to verify the scope yourself. Return to gutter discharge options or swale drainage planning once the local office has confirmed what route is feasible.

Sources

• Fairfax County Land Development Services: Land Disturbance 101. Accessed Nov 2, 2026.
• Seattle Public Utilities: Side Sewer Permits. Accessed Nov 2, 2026.
• Common Ground Alliance: Before You Dig. Accessed Nov 2, 2026.

Source scope and rate limitations: drainage sources and methodology.