Polk County, IA Building Safety: Plumbing Permits (2026)
Key Facts
- Adopted code
- Uniform Plumbing Code (Iowa-amended)
- Permit exemptions
- Section 20.1.11 countywide short list
- Min. sewer diameter
- 4 inches to point of connection
- Frost protection
- Cast iron if under 42" below grade
- Grease interceptors
- Per Div. 5, Ch. 19 of County Code
- Enforcing office
- Polk County Building Official
Summary
Unincorporated Polk County requires a plumbing permit for work covered by the Uniform Plumbing Code (UPC), adopted as amended by the Iowa Plumbing and Mechanical Systems Board. Section 20.2.8 of the Construction Code sets the permit, fee, and inspection framework and layers on county-specific technical rules, including a 4-inch minimum building sewer diameter.
The Uniform Plumbing Code, as prepared and edited by the International Association of Plumbing and Mechanical Officials, as currently adopted and amended by the Plumbing and Mechanical Systems Board, Iowa Department of Public Health and including Sections 103 through 107, is hereby adopted by reference as the code of Polk County for the control of plumbing systems... .3 Section 104.2 Work Exempt from Permit... Work exempt from permits shall be per Section 20.1.11 of Chapter 20 Polk County Construction Code.
Full Breakdown
Polk County's Chapter 20 Plumbing Code, Section 20.2.8, adopts the Uniform Plumbing Code (UPC) 'as currently adopted and amended by the Plumbing and Mechanical Systems Board, Iowa Department of Public Health.' The county deleted the UPC's own permit-exemption section (104.2) and folded plumbing work into the same countywide exemption list at Section 20.1.11, so the short list that exempts minor electrical and mechanical work also applies to plumbing. Permits expire under the countywide Section 20.4.3 timeline, and fees follow the schedule the Board of Supervisors adopts by resolution rather than a UPC default fee table.
Beyond the permit mechanics, Polk County wrote several of its own technical plumbing standards into Section 20.2.8: building sewers must be at least four inches in diameter to the point of connection (item .12), building sewers less than 42 inches below grade must be cast iron or otherwise protected from freezing and frost heave (item .13), SDR 23.5 pipe is an approved material for exterior building sewers (item .10), and grease interceptors must comply with Division 5, Chapter 19 of the Polk County Code of Ordinances rather than the UPC's own grease-interceptor section (item .14). A licensed Iowa plumbing contractor, or a homeowner using the Section 20.4.1 owner-exception for an existing homestead-qualified residence, can pull the permit; commercial and new-construction work does not qualify for that owner exception.
Violations & Fines
Doing plumbing work without a permit, or violating the approved plans, is a Chapter 20 violation under UPC Section 106.3 as amended: the Building Official can issue a stop-work order under Section 106.4 and refer the case for the fines and civil penalties in Chapter 2 of the Polk County Code of Ordinances, the same penalty structure used across every technical code in this chapter.
Frequently Asked Questions
What plumbing code does unincorporated Polk County use?
What size does my building sewer have to be?
Can I do my own plumbing work on my house?
Sources & Official References
Other rules in Polk County
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