Whitman County, Washington
Plumbing Code Checklist

Make sure your plumbing work meets local building codes before the inspector comes out. Covers Whitman County requirements based on Local building code.

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What's in the checklist

Water Supply

✅Main water shutoff valve must be accessible within 3 feet of where service enters building (max 3 feet)UPC 606.1
✅Water service pipe must be buried at least 12 inches below grade (min 12 inch)UPC 609.1
✅Water pressure must be between 35 and 80 psi (35-80 psi)UPC 608.1
✅Pressure reducing valve required when supply exceeds 80 psiUPC 608.2
🔷Water hammer arrester required for quick-closing valves on washing machines and dishwashersUPC 609.10

Drainage

✅Main building drain must have minimum 1/4 inch per foot slope for pipes up to 3 inchesUPC 708.1
✅Cleanout required at base of every waste stackUPC 713.1
✅Cleanout access must have minimum 18 inches clearance in front (min 18 inch)UPC 713.4
✅Every trap must be protected against siphonage and back-pressure through an approved ventUPC 901.2
🔷Building sewer connection to public sewer must include a backwater valve where fixtures are below sewer overflow levelUPC 710.1

Venting

✅Every fixture must be vented — maximum distance from trap to vent depends on pipe diameterUPC 904.1
✅Vent termination must be at least 6 inches above roof penetration (min 6 inch)UPC 906.1
✅Vent must terminate at least 10 feet from any air intake, window, or door (min 10 feet)UPC 906.2

Fixtures

✅Water heater temperature and pressure relief valve discharge pipe must terminate within 6 inches of floor (max 6 inch)UPC 608.5
✅Backflow preventer required on all hose bibs and irrigation connectionsUPC 603.5
✅Individual shower and tub-shower combination valves must limit maximum outlet water temperature to 120°F (49°C) (max 120 Fahrenheit)UPC 424.3
🔷Floor drains must have a trap primer or be designed to prevent trap seal evaporationUPC 1007.0

Piping Material

✅Copper water supply pipe must be minimum Type M (or Type L for underground)UPC 604.2
✅PVC DWV pipe must be Schedule 40 minimumUPC 705.2

Testing

✅DWV system must pass a 10-foot head water test for minimum 15 minutes with no leaksUPC 712.1

Based on Local building code. This checklist reflects state-level code requirements — always consult the local Authority Having Jurisdiction (AHJ) for any county-specific amendments before construction.

Frequently asked questions

Does a plumbing project in Whitman County need a permit?

Most plumbing work in Whitman County, Washington requires a building permit before construction. CodeCheckHQ helps you verify your work meets Local building code requirements before the inspector arrives.

What codes apply to Whitman County plumbing work?

Whitman County follows Local building code with local amendments. CodeCheckHQ checklists are derived from these codes and reflect state-level modifications.

How long does a plumbing inspection take in Whitman County?

A typical plumbing inspection in Whitman County takes 30-60 minutes. Pre-walk the CodeCheckHQ checklist to identify and fix issues before scheduling.

Can I use CodeCheckHQ for a Whitman County plumbing self-inspection?

Yes. CodeCheckHQ is a pre-inspection self-audit tool — not a replacement for the official AHJ inspection. Use it to catch issues early; official approval must come from a licensed inspector.

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Whitman County building code requirements in plain English. Mark each item Pass, Fail, or N/A. Get a PDF report.

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Whitman County, WashingtonPlumbing Code Checklist

What's in the checklist

Water Supply

Drainage

Venting

Fixtures

Piping Material

Testing

Frequently asked questions

Does a plumbing project in Whitman County need a permit?

What codes apply to Whitman County plumbing work?

How long does a plumbing inspection take in Whitman County?

Can I use CodeCheckHQ for a Whitman County plumbing self-inspection?

Don't guess. Check it now.

Whitman County, WashingtonPlumbing Code Checklist

What's in the checklist

Water Supply

Drainage

Venting

Fixtures

Piping Material

Testing

Frequently asked questions

Does a plumbing project in Whitman County need a permit?

What codes apply to Whitman County plumbing work?

How long does a plumbing inspection take in Whitman County?

Can I use CodeCheckHQ for a Whitman County plumbing self-inspection?

Don't guess. Check it now.

Whitman County, Washington
Plumbing Code Checklist

Whitman County, Washington
Plumbing Code Checklist