Water-Treatment Installer (WTI) Last updated 11/05/2021

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License Fee Description Exemptions


Water treatment installers are authorized to make connections to potable water systems and indirect waste connections to existing drain waste and vent systems.


License renewal is every three years on April 1.

Renewal Information

A renewal notice will be mailed to the licensee approximately six weeks prior to the expiration of their license. Continuing Education (if necessary) and fees will be explained on the renewal form. Renewal fees vary by license type.

Duplicate License Requirements

If you lost your license or have changed your address and would like a replacement license, submit form 2523 from Building Codes website, along with appropriate $10 fee.

Processing Time

Processing Time Description
1 Week Incomplete applications may cause delays

Prerequisites and Requirements


A certificate of completion from a registered 18-month Oregon State Apprentice program or a referral letter from either the registered training committee or Oregon Plumbing Board approved training program.
• Proof of 210 hours of lawful experience and training in all work categories
• Proof of 3,000 hours of training in all of the subject areas

Required Documentation

Completed application with applicable fee
Copy of high school diploma, GED or equivalent
Copy of apprenticeship completion (if required by license type)
Experience qualification documents (if required by license type)

Examination Information

Three-hour, 52 question, open book exam. Upon approval, a list will be provided outlining approved exam material.

Continuing Education Requirements

Exempt from continuing education requirements.​.

Bonding Requirements


Insurance Requirements


Additional Information

Other Information


Statutes, Administrative Rules, Ordinances

Other Detail Information

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