Public Health Ontario Sterilization Log Requirements: What Inspectors Review

The first document a public health inspector asks for during a dental or clinic sterilization review is not the autoclave manual. It is the log. A complete log answers three questions in sequence: when the cycle ran, whether the parameters were met, and whether the monitoring confirmed it. When any one of those is missing, the review moves from a routine check to a discussion about reprocessing practice.

What a Complete Log Contains

Ontario's dental regulator expects instrument reprocessing to be documented so that any load can be traced after the fact. In practice the log columns are consistent across practices:

• Date and time of the cycle, with the sterilizer identified when a practice runs more than one unit.
• Cycle number or load identifier, tied to the wrapped sets in that load.
• Physical parameters: temperature and pressure, or the printed record from a data logger.
• Chemical indicator result — the external tape or internal indicator on the pouch.
• Biological indicator result, read at the stated window, with the lot number recorded.
• Operator initials and any deviation noted during the cycle.

A log that records only "cycle run at 9:15" is not a sterilization record. It is a note that someone was in the room.

The Frequency Inspectors Ask About

Ontario Regulation 347 governs biomedical waste handling in the province, and the professional regulator sets the reprocessing documentation expectation that inspectors test against. For instrument reprocessing in Ontario dental practice, a biological indicator is run each day the sterilizer is used, and the result is entered on the same day. A practice that sterilizes on two days of the week therefore produces two monitoring entries that week, not one. The distinction matters because monitoring is meant to be continuous with use, not calendar-based.

Alongside the biological indicator, a Bowie-Dick type test provides a daily check on air removal in vacuum sterilizers. Bowie-Dick test packs built to ISO 11140-5 Type 2 are designed for that purpose, and the result belongs on the same page as the cycle record.

When a Result Fails

The value of a log shows up on the day something fails. A failed biological indicator means the load and everything processed in the same cycle is quarantined, the sterilizer is reviewed, the cycle is repeated with a fresh indicator, and the event is recorded with the action taken. Inspectors look for evidence that this happened in the past — a noted deviation, a repeat result, a signature — rather than for a log where every entry passed.

For practices searching for historical records, a practical approach to rebuilding a sterilization log is covered in a separate guide.

Paper or Digital

Both formats are accepted. The risk profile differs. A paper binder is simple but can be lost, and it often lives in the sterilizing room where humidity and spills threaten it. A digital sheet is easier to search and back up but must be locked so entries cannot be edited after the fact without a visible trace.

Whichever format a practice chooses, the log needs to survive an inspection that happens months later. That means a monthly backup or a duplicate kept outside the sterilizing room, and a written procedure saying who reviews the log and how often.

Supplies That Keep the Log Complete

A log is only as good as the consumables behind it. Practices that run out of indicator tape mid-week start skipping entries, and skipped entries are what inspectors find. Keeping one sealed backup of each monitoring item — tape, pouches, indicators — prevents that failure mode. A 50-pack of 24-hour self-contained indicators covers a practice running one test per sterilizer day for roughly two months, and a 24-well dry block incubator keeps incubation conditions consistent across those tests.

Practices that want to validate the routine before committing to a larger order can start with the 5-pack biological indicator trial, which covers five cycles for $12.99 with shipping included and produces five entries for the log.

Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.

Related Reading

• Sterilization compliance hub
• RCDSO vs Ontario public health: who enforces sterilization rules
• Free printable autoclave sterilization log sheet
• Rebuilding a sterilization log after a public health inspection
• free Ontario sterilization compliance log

Frequently Asked Questions

How often does a biological indicator need to be run for an Ontario dental practice?

Each day the sterilizer is used, with the result recorded on the same day. A practice that sterilizes on three days of the week produces three monitoring entries that week.

What has to be recorded for each sterilization cycle?

Date and time, sterilizer identity, cycle or load number, physical parameters, chemical indicator result, biological indicator result, operator initials and any deviation. The load number is what makes a trace-back possible.

Is a paper log acceptable during an inspection?

Yes, provided it is complete, legible and dated. Practices using paper should store the binder away from the sterilizing area and keep a duplicate or scan, because a lost binder is treated the same as missing records.

What happens if the log has gaps from a busy period?

Gaps are treated as unverified cycles. The practical remedy is to document what can be reconstructed, note the gap honestly, and tighten the routine — a monthly review with a signature is the usual corrective action.

Last updated: September 2026. CliniEco Medical is a licensed medical device establishment (MDEL #35334).