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Cleanroom Environmental Monitoring Log Worksheet

Environmental monitoring (EM) data is only useful when you can see it in order, against its limit, and spot trends. This worksheet gives microbiology and QA teams a clean log with limits, percent of limit and a clear excursion count that exports to Excel.

Download:

Date	Sample location	Grade	Method	Count (cfu)	Action limit	Percent of limit	Excursion (1 = yes)	Organism ID
						0%	0
						30%	0
						120%	1
						32%	0
						20%	0

Excursions in log

Highest percent of limit

120%

Samples logged

Typical EU GMP Annex 1 (2022) recommended action limits for grade B are 10 cfu/m3 air, 5 cfu/4 h settle plate and 5 cfu/plate contact. Grade C: 100, 50, 25. Grade D: 200, 100, 50. Grade A requires no growth. Use your own validated alert and action levels where they are tighter.

Trend EM data against production

Want EM excursions linked to the batches running at the time? Ask for an expert review of your data flow.

Optional. The tool and every export work without this. No spam.

How to use the log

Add one row per sample. Pick the grade and method, type the count and the action limit from your EM procedure, and add the organism ID when available. Percent of limit and the excursion flag are calculated for you. Grade A results above zero need immediate review. Sort or filter the exported Excel by location to see repeated hits at the same point, which is the early sign of a trend.

Keep one row per plate, not per room per day
Record the organism for every count, especially in grades A and B
Copy limits from your approved SOP, not from the notes

Limits and standards behind it

Annex 1 of EU GMP (revised 2022) gives recommended limits for microbial contamination per grade, and ISO 14644 covers particle classification, which is a separate monitoring stream. The limits in the notes are recommended maxima, and sites set their own alert and action levels based on historical data and risk. Alert levels trigger a review of trend, action levels trigger an investigation. This worksheet uses a single limit column so you can use whichever you track.

Reading the result

In the example, the stopper bowl wall contact plate shows six cfu against a limit of five, which gives 120 percent and one excursion. That would start an investigation covering the operators present, cleaning records and the organism's likely source. A string of results at 70 to 90 percent of limit in a grade B room is not an excursion but should be discussed at the monthly trend review.

Flag repeat organisms at the same location
Check any excursion against the batch in process at the time

Frequently Asked Questions

Are the limits in the notes mandatory?

They are the recommended limits in EU GMP Annex 1 (2022). Your site may use stricter alert and action limits based on trend data. Regulators expect justified limits in the contamination control strategy, not a copy of a table.

Does this replace a LIMS?

No. It is a simple log for small sites, trials and trend discussions. For regulated records you need audit trail, secure access and controlled calculations in a validated system or controlled paper process.

What do I do for a grade A count above zero?

Treat it as an event requiring immediate investigation under your procedure, including identification of the organism and assessment of batch impact. Do not wait for the monthly trend meeting.

Should particle counts be in this log?

Keep them in a separate log or system because the units and limits are different. Non viable particle monitoring follows ISO 14644 classes and the Annex 1 particle limits for each grade.

If EM results sit in a LIMS or spreadsheets and you want trend charts and batch impact checks against ERP production orders, Netray can help build it on your own infrastructure.

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