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Plumbing Permit in Unincorporated Natrona County, Wyoming

Required for plumbing installations, gas line work, and septic-connected plumbing in unincorporated Natrona County. Governed by the 2024 International Plumbing Code (IPC) as adopted by Resolution 89-24, and the 2024 International Fuel Gas Code for gas piping.

Verified 2026-07-01 · Source

When you need this permit

  • Plumbing Permit Application submitted to the Natrona County Building Department
  • Specify whether the work is a gas-line-only install/repair
  • Water source (Public/Well) and sewer type (Public/Septic) with providers must be identified; septic system status (new install vs. existing) must be disclosed
  • Nature of Project options: New Construction, Basement Finish, Addition, Remodel, Repair
  • Commercial kitchen disclosure required if applicable; yard hydrant installations must be disclosed with hydrant type
  • Fuel type must be specified (Natural Gas, Liquid Propane Gas, Other) for gas piping work
  • Work must be performed by a Natrona County-licensed Plumbing Contractor, Master, Journeyman, or Apprentice (or Gas Fitter/Boiler Operator as applicable)

Required documents

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Fee schedule

Plumbing Permit Fee — valuation-based (same table as building permits)Natrona County Permit Fees, Resolution No. 45-20 — plumbing has no separate flat fee; charged under the same combined valuation-based schedule as building/electrical/mechanical.
$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000
Plumbing Contractor License — InitialNatrona County Contractor Fees (Revised 02/21)
$300 (Contractor); $75 (Master); $25 (Journeyman); $3 (Apprentice); $20 (High Pressure Boiler Operator); $10 (Low Pressure Boiler Operator / Gas Fitter)
Plumbing Contractor License — Annual Renewal
$75 (Contractor); $37.50 (Master); $15 (Journeyman); $3 (Apprentice); $10 (High Pressure Boiler Operator); $5 (Low Pressure Boiler Operator / Gas Fitter)

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Natrona County building department
~3–10 business days

How long did your Plumbing Permit permit actually take in Unincorporated Natrona County?

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Inspection process

  1. 1

    Underground / Under-Slab

    Before concrete pour or backfill — pipe slope, materials, cleanouts

  2. 2

    Rough-In

    After pipes installed, before walls closed — pressure test

  3. 3

    Final

    All fixtures connected, no leaks, proper venting verified

See the full Unincorporated Natrona County inspection guide — scheduling & re-inspection fees →

Tips

  • If your project involves a new septic system or connects to an existing one, coordinate with the Casper-Natrona County Health Department in addition to the county Building Department's plumbing permit.
  • Gas-line-only work is flagged as its own checkbox on the plumbing application — you do not need a separate mechanical permit solely for a gas line install/repair.

Frequently asked questions

Unincorporated Natrona County requires a plumbing permit for: Plumbing Permit Application submitted to the Natrona County Building Department; Specify whether the work is a gas-line-only install/repair; Water source (Public/Well) and sewer type (Public/Septic) with providers must be identified; septic system status (new install vs. existing) must be disclosed; Nature of Project options: New Construction, Basement Finish, Addition, Remodel, Repair; Commercial kitchen disclosure required if applicable; yard hydrant installations must be disclosed with hydrant type; Fuel type must be specified (Natural Gas, Liquid Propane Gas, Other) for gas piping work; Work must be performed by a Natrona County-licensed Plumbing Contractor, Master, Journeyman, or Apprentice (or Gas Fitter/Boiler Operator as applicable). If your project isn't listed, confirm with Natrona County Building Department at (307) 235-9435 before starting work.

In Unincorporated Natrona County, the published Plumbing Permit Fee — valuation-based (same table as building permits) is: $70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000. Additional published fees: Plumbing Contractor License — Initial — $300 (Contractor); $75 (Master); $25 (Journeyman); $3 (Apprentice); $20 (High Pressure Boiler Operator); $10 (Low Pressure Boiler Operator / Gas Fitter); Plumbing Contractor License — Annual Renewal — $75 (Contractor); $37.50 (Master); $15 (Journeyman); $3 (Apprentice); $10 (High Pressure Boiler Operator); $5 (Low Pressure Boiler Operator / Gas Fitter). These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a plumbing permit in Unincorporated Natrona County typically runs 3–10 business days. This is an estimate, not a published figure — confirm current review times with Natrona County Building Department at (307) 235-9435.

You'll need: Natrona County Plumbing Permit Application (2025). See the required-documents checklist on this page for details on each.

Unincorporated Natrona County requires 3 inspection(s) for a plumbing permit, in order: Underground / Under-Slab, Rough-In, Final. Schedule each through Natrona County Building Department ((307) 235-9435).

Apply through Natrona County Building Department at 200 N. Center St, Room 205, Casper, WY 82601. Phone: (307) 235-9435, email: Contact via natronacounty-wy.gov (email obfuscated on site; call 307-235-9435). Office hours: Monday–Friday, 8:00 AM–5:00 PM. Official information: https://www.natronacounty-wy.gov/170/Building-Inspection.

Unincorporated Natrona County, Wyoming has adopted: 2024 International Building Code (IBC) — adopted by Resolution 84-24; 2024 International Residential Code (IRC) — adopted by Resolution 90-24; 2024 International Existing Building Code (IEBC) — adopted by Resolution 85-24; 2024 International Fire Code (IFC) — adopted by Resolution 86-24; 2024 International Fuel Gas Code (IFGC) — adopted by Resolution 87-24; 2024 International Mechanical Code (IMC) — adopted by Resolution 88-24; 2024 International Plumbing Code (IPC) — adopted by Resolution 89-24; 2023 National Electrical Code (NEC / NFPA 70) — adopted by county resolution. Local amendments apply — see the Unincorporated Natrona County overview page for the full list.

The county's Plumbing Permit Application asks whether the septic system is a new install or an existing/prior sewer system and requires disclosure of the sewer provider. On-site wastewater/septic system approval itself is coordinated with the Casper-Natrona County Health Department, in addition to the county's plumbing permit for the in-building plumbing work.

Sources & verification

Verified against official sources. Last reviewed 2026-07-01.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Unincorporated Natrona County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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