Our Goals

Protect the water supply by insuring the plumbing has no cross-connections or possibility of back flow. Inspecting the waste plumbing to verify it is properly vented and trapped so the plumbing safely carries waste away to insure it does not create a health hazard.

By law, only State Certified Plumbing Inspectors can inspect commercial and residential plumbing work in Miami County. Plumbing Inspectors must follow the Ohio Administrative Code known as the Ohio Plumbing Code - and the Miami County Plumbing Regulations.

All people doing plumbing work must be registered with Miami County Plumbing Department or be a homeowner working on their own residence. Rental properties must have a registered, state certified plumbing contractor do the work. Plumbing permits are issued through this office. Plumbing Contractors working on commercial projects and homeowners must meet with plumbing inspectors before a permit will be issued.

Important Information for Plumbing Contractors

Miami County Public Health is excited to announce the upcoming launch of iWorQ for plumbing permitting, plan review and backflow certification tracking.  This new online platform will allow plumbing companies to electronically submit plans, request permits, submit backflow test results and to pay fees online.  For those who have conducted business with the Miami County Department of Development (building department), this is the same system they use for gas line inspection requests and other permits.

With this change, all plumbing fees paid with a credit card will be assessed a 2.85% processing fee (minimum fee of $2.00) or if using an E-Check, a $1.50 flat fee.  This fee is charged and remitted to the credit card company.  Any payments in cash or check, will not be subject to the processing fee.  You will still be able to pay in person at our office.  The processing fee will be charged in person at our office if you pay by credit card.

We will keep the ability for you to submit plans and permit requests in person, over email, or fax. If you submit plans or permit requests manually, we will enter the information into the iWorQ system.   We prefer you use the iWorQ system as it will streamline the process. 

If you are registered with Miami County Public Health to certify backflow devices and have provided your email address, you will receive an email from iWorQ to set up an account in the online portal.  Access to the online portal will allow you to submit tests and search for assembly devices.

For currently registered plumbing contractors, if we have your email, you will receive an email on how to register for 2024.  If we do not have your email, a form will be mailed to you.  The registration form is also on our website at  under the Plumbing tab.  Registration information will go out the last week of November.


To electronically submit plumbing plans and applications for plumbing permits, please use the appropriate county portal link below:

Auglaize County

Mercer County

Miami County

To electronically register as a plumbing contractor in Miami County, please use the link below:

Plumbing Contractor Registration

Registered backflow companies and/or testers can electronically submit a backflow assembly test report, please use the link below:

Backflow Assembly Report



Attention Backflow Inspection Companies- Effective July 1, 2021, Miami County Public Health will no longer be the record keeper for annual backflow certifications in West Milton and Ludlow Falls. Please send annual certification results to the village of West Milton.

All annual backflow certifications within the city limits of Piqua should be sent to the Piqua Municipal Water System.


Plumbing Complete Fee Schedule


Registered Backflow Inspection Companies

Forms (hard copies)

MIAMI - Plumbing Permit Application

MIAMI- Plumbing Contractor Registration

MERCER - Plumbing Permit Application

AUGLAIZE - Plumbing Permit Application

Backflow Certification Form

Irrigation Permit Form


Ohio Plumbing Code

Miami County Plumbing Regulations

Frequently Asked Questions

General Information - Plumbing in Miami County