A plain-English walkthrough of getting certified in Indiana — commercial certification, the registered technician path, and private permits, plus what it costs and how to study and pass. Uniquely, Indiana runs pesticide certification through the Office of Indiana State Chemist (OISC), housed at Purdue University.
Certification is a closed-book Core exam plus a category exam, each at 70% or better. Exams are free at Purdue's West Lafayette campus (schedule through OISC) and offered for a fee at Ivy Tech testing centers around the state — with a limit of three attempts per exam in any 12-month period. Purdue Pesticide Programs publishes the training manuals, which build on the same national core foundation our practice bank drills.
The private applicator permit is $20 for five years, renewed by attending three PARP programs during the period (max two per year) or retesting. Commercial certification also runs five years, renewed by accumulating continuing certification hours (CCHs) — the count varies by category (agricultural 20, ornamental 15, wood-destroying inspection 10, registered technician 8), with no more than half from any single program — or by retesting. The commercial applicator license fee is $45, and pesticide businesses need a $45-per-year license per location with insurance. Confirm current fees with OISC; reciprocity is handled case by case and includes Michigan.
Indiana certifications run five years, expiring December 31 of the fifth year. Private applicators renew the $20 permit by attending three PARP recertification programs during the period — no more than two in any single year — or by retesting; OISC mails the renewal letter each October of the expiration year. Commercial applicators bank Continuing Certification Hours instead, with counts that vary by category (agricultural runs 20, ornamental 15, registered technicians 8) and no more than half from any single program; hit the count and certification renews automatically, or retest core and categories. Repeats of the same course never double-count within a cycle. Confirm your category hours with OISC before December 31 of year five.
This guide names reciprocity arrangements between Indiana and the states below. Terms vary by category and license type, and agreements change — confirm the current arrangement with OISC before relying on it.
The Office of Indiana State Chemist (OISC), located at Purdue University — a unique arrangement that puts certification, training, and enforcement under one roof. Purdue Pesticide Programs supplies the training manuals.
An entry-level credential: pass the Core exam and your employer registers you with OISC. Technicians apply general-use pesticides under a certified applicator's supervision, but since 2023 cannot apply restricted-use products.
Both private and commercial credentials run five years. Private applicators attend three PARP programs during the period; commercial applicators accumulate their category's continuing certification hours (CCHs) — or either can simply retest.
The private permit is $20 for five years; the commercial applicator license fee is $45, with exams free at Purdue West Lafayette (a fee applies at Ivy Tech sites). Businesses applying for hire also need a $45 annual pesticide business license per location. Confirm current fees with OISC.
Office of Indiana State Chemist (at Purdue University) (OISC) administers pesticide applicator certification in Indiana. Official requirements, applications, and scheduling come from the agency directly at https://oisc.purdue.edu/pesticide/.
Indiana has reciprocity arrangements with Michigan. Terms vary by category and license type and agreements change, so confirm the current arrangement with OISC before relying on it.
Start with the National CORE material — the safety, label, and law foundation every state exam draws on. The free practice exams, flashcards, and study guides on this page mirror the real exam format: timed, scored, with a plain-English rationale on every question.
