Does Natrona County require a separate permit for septic-connected plumbing?

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.

Plumbing Permit in Unincorporated Natrona County, Wyoming

Verified

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

$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000Plumbing Permit Fee — valuation-based (same table as building permits)

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

Req
Natrona County Plumbing Permit Application (2025)
Covers new plumbing, gas line work, water/sewer connections, and septic-related plumbing

Fee schedule

Fee type	Amount	Notes
Plumbing Permit Fee — valuation-based (same table as building permits)	$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000	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.
Plumbing Contractor License — Initial	$300 (Contractor); $75 (Master); $25 (Journeyman); $3 (Apprentice); $20 (High Pressure Boiler Operator); $10 (Low Pressure Boiler Operator / Gas Fitter)	Natrona County Contractor Fees (Revised 02/21)
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

~3–10 business days

Typical estimate — confirm current times with the Unincorporated Natrona County building department

Inspection process

1
Underground / Under-Slab
Before concrete pour or backfill — pipe slope, materials, cleanouts
2
Rough-In
After pipes installed, before walls closed — pressure test
3
Final
All fixtures connected, no leaks, proper venting verified

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

Does Natrona County require a separate permit for septic-connected plumbing?: 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.

Other permits in Unincorporated Natrona County

Residential Building Permit (New Construction)Residential Addition / Remodel Permit Electrical Permit Mechanical / HVAC Permit Roofing Permit (Reroof)Solar PV Permit Accessory Dwelling Unit (ADU) Permit Demolition Permit Commercial Tenant Improvement Permit Deck Permit

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