1.3 DEQ Certificates: Qualifications, OIT, Provisional Path, Exams and Fees
Key Takeaways
With a high school diploma or GED, Grade I needs 1 year of experience (6 months with an approved associate or four-year degree), Grade II needs 3 years, Grade III 6 years and Grade IV 8 years, with half of the Grade III or IV time at a Class II or Class III system respectively.
Treatment Grade IV also requires at least one year of post-high-school education; one year equals 45 CEUs or 45 quarter or 30 semester credits.
OIT applicants who complete DEQ-approved training may take the SWWS or Grade I exam and have 36 months to earn the experience; a Grade I Provisional certificate lasts 12 months and is not renewable.
Since May 1, 2025, DEQ exams are WPI 2025 standardized exams through PSI with 100 scored items plus up to 10 unscored, 3 hours, and a scaled passing score of 70.
An applicant may not take the same exam type and grade more than twice in 12 months unless they show specific education completed in the subject area.
How a DEQ Certificate Is Earned
DEQ's FAQ sums up the process in three steps: qualify by education and experience, apply with fees through Your DEQ Online (YDO), and pass a national standardized exam. You do not need a lower grade first. Any applicant who meets the requirements for a grade may apply for it directly.
Education and Experience Pathways (OAR 340-049-0030)
Every certificate requires a high school diploma, GED or equivalent. The pathway tables (rules effective January 1, 2025) then trade years of operating experience against years of qualifying post-high-school (PHS) education:
| Certificate | HS only | With PHS education |
|---|---|---|
| SWWS and Grade I (treatment or collection) | 12 months | 6 months plus an approved associate degree in water or wastewater technology, or a four-year degree (no related-experience credit in the 6 months) |
| Grade II | 3 years | 2 years + 1 year PHS; or 1 year + four-year degree |
| Grade III | 6 years, half at a Class II or higher system | 5 + 1 PHS; 4 + 2; 3 + 3; or 2 years + four-year degree (half at Class II or higher in every path) |
| Grade IV Collection | 8 years, half at Class III or higher | 7 + 1; 6 + 2; 5 + 3; 4 years + 4 years PHS (half at Class III or higher) |
| Grade IV Treatment | HS plus at least 1 year PHS, 8 years, half at Class III or higher | 6 + 2; 5 + 3; 4 + 4; or 3 years + a master's or doctorate (half at Class III or higher) |
Key definitions:
- One year of PHS education equals 45 CEUs, or 45 quarter or 30 semester credits in applied or technical sciences, which may be combined. DEQ counts it only in whole-year increments.
- Operating experience means routine on-site performance of operator duties that affect system performance. Officials, managers and engineers whose duties do not include hands-on operation or on-site supervision do not earn it. Operator trainee or intern time can count for up to 100 percent, and part-time work can count.
- Related experience may cover up to 50 percent of the requirement. Qualifying fields include the other wastewater specialty, water treatment, water distribution, laboratories, maintenance, pretreatment, industrial treatment, stormwater, and trades such as plumbing, pump mechanics and welding. It never reduces the Grade III or IV class-level minimums.
Important
DEQ warns applicants not to apply early. An applicant even one month short of the minimum may be approved for a different designation with other requirements.
Entry Paths: OIT, Provisional and SWWS
| Path | Who qualifies | What happens |
|---|---|---|
| Operator-in-Training (OIT) | Meets education but lacks experience; has completed or is enrolled in DEQ-approved training | May take the SWWS, Grade I Treatment or Grade I Collection exam. After passing, recognized as an OIT for up to 36 months, then must file a post-exam application and fee once experience is met; otherwise the scores expire. |
| Grade I Provisional | Currently gaining experience at a system; HS or GED; in or done with DEQ-approved training; supervised by a certified operator who signs an affidavit | Receives a 12-month, non-renewable certificate without passing the exam and is enrolled for the Grade I exam with one year to test. A post-exam application follows after 12 months of experience. |
| SWWS certificate | HS or GED plus 12 months at any class system (or 6 months with the degree option) | Passes the single SWWS exam and may supervise a system designated as a Small Wastewater System. |
DEQ-approved training for OIT and Provisional applicants includes the Sacramento State Operation of Wastewater Treatment Plants, Volume I (modules A-C), the WEF Wastewater Treatment Fundamentals I and II courses, Operation and Maintenance of Wastewater Collection Systems, Volume I, Small Wastewater System Operation and Maintenance, Volume I, and water technology programs at Clackamas and Umpqua community colleges.
Applying and Testing
- Create a YDO account, submit the application with education documents, an experience affidavit and fees.
- DEQ reviews eligibility, usually in about four weeks. An eligible applicant gets an email with instructions to self-schedule with PSI. Computer-based testing runs year-round, up to six days a week, and two exams may be scheduled on the same day.
- Under the waiver provisions of OAR 340-049-0055(7), DEQ may also admit an applicant who will meet the education or experience requirement by the end of the fourth calendar month after the exam month. The certificate is withheld until proof arrives.
Exam format (WPI 2025 standardized exams, offered by DEQ since May 1, 2025):
- Separate exams: SWWS, and Grades I-IV for Treatment and for Collection.
- 100 scored multiple-choice items plus up to 10 unscored pretest items scattered through the exam.
- Three-hour, closed-book, computer-based test. A non-programmable calculator is allowed, and the WPI formula and conversion table is provided at the test site.
- Results are reported as a scaled score, and 70 scaled points is passing. Scaling means the underlying raw cut can differ by exam form (DEQ's example: a Grade IV raw cut of 67 or a Grade I raw cut of 72 are both reported as 70).
- Scoring is automatic and cannot be contested. The score report breaks results out by Need-to-Know content area.
- Grade I and II Treatment and Collection exams are available in Spanish.
Retakes (OAR 340-049-0055): A failed candidate reapplies for re-examination with the fee. A person may not take the same type and grade exam more than twice in a twelve-month period unless they show specific education completed in the subject area. Anyone who does not apply for re-examination within one year of the initial exam must file a new exam application.
Fees (OAR 340-049-0065, Table B, effective July 1, 2026)
| Item | Fee |
|---|---|
| SWWS; Grade I or Provisional (treatment or collection) application | $177 |
| Grade I or Provisional, treatment and collection | $254 |
| Grade II / Grade III / Grade IV application | $216 / $254 / $304 |
| Examination fee | $127 |
| Re-examination or reschedule | $304 |
| Post-examination application | $62 |
| Reciprocity (Grade I / II / III / IV) | $201 / $240 / $278 / $330 |
New and upgrade applications pay the application fee plus the exam fee. Table D raises fees again on July 1, 2027 (for example, the exam fee becomes $142). Most application fees are non-refundable.
Reciprocity
DEQ has no automatic exchange agreement with any state. An applicant with a valid certificate in good standing from another state or Canadian province, or a WPI Professional Operator certification, applies through YDO, attaches the certificate, and must meet Oregon's education and experience requirements. If the applicant passed a standardized ABC/WPI exam, DEQ can waive the exam at the same grade. If the out-of-state exam was state-specific, the waiver is at one grade lower than the corresponding Oregon grade.
An applicant with only a high school diploma has 6 years of wastewater treatment experience, 2 of them at a Class II plant and 4 at a Class I plant. Can DEQ certify this applicant at Grade III Treatment?
No, because Grade III requires an associate degree in every path
Yes, because 6 years meets the Grade III total and plant class does not matter
No, because at least half of the 6 years, or 3 years, must be at a Class II or higher plant
Yes, because related experience can make up the missing year at a Class II plant
A new hire has a GED and has finished the Sacramento State Volume I treatment modules but has only 3 months of experience. Which DEQ option lets this person take the Grade I Treatment exam now?
Reciprocity, because the Sacramento State course is a national program that DEQ recognizes
A direct Grade II application, because completed coursework substitutes for all required experience
The Operator-in-Training path, which allows the Grade I exam with 36 months to earn experience
None; DEQ admits applicants to any exam only after they complete 12 months of experience
A candidate fails the Grade II Collection exam in January and again in April. What does OAR 340-049-0055 say about a third attempt in July?
Only if the candidate shows specific education in the exam subject, since the limit is two tries in 12 months
It is allowed only after a mandatory two-year waiting period from the date of the first failed attempt
It is not allowed until the candidate first passes the Grade I Collection exam a second time
It is allowed without any conditions, as long as the candidate pays the re-examination fee each time
Sections you finish are checked off in the contents.