A household pest observation checklist you can reuse

A useful pest record is a small collection of dated observations. It should let someone who was not there understand what you saw, where you saw it, and what is still unknown. This checklist is designed for that handoff. It is not a professional inspection certificate or a pest-free guarantee.

Choose a recording route before starting

Use the type of finding to decide what can be recorded safely. A photograph is optional; a written observation is still useful when a closer view would mean touching waste, entering a roof space, or moving a heavy object.

Finding	Useful record	Question for the next person
A live insect on an accessible surface	Full-body image, approximate body length, place and time	Can this specimen be identified?
A stain, skin, or suspected egg	Overview plus detail; material it is on	What would distinguish this from a lookalike?
Wood damage or a tube	Location sketch and accessible photographs	Who should assess activity and structural condition?
Suspected rodent or wildlife waste	Existing view from a clean, safe position	What identification and cleanup assessment is appropriate?

For the last row, use the CDC rodent cleanup instructions when rodents are involved. Do not sweep or vacuum suspected rodent waste to prepare the scene for photographs.

Copy this observation card

• Record ID: a short label, such as K1, that also appears in photo filenames.
• Seen on: date and approximate time; write “time unknown” when needed.
• Location: room, object, and side or surface.
• Visible finding: number actually seen, shape, color, movement, and scale.
• Context: recent deliveries, repair, cleaning, or a directly observed leak.
• Access limits: surfaces concealed, out of reach, or unsafe to approach.
• Files: original photo filenames kept outside this website.
• Question: the one decision you need help making.
• Follow-up: who assessed it, when, and what they actually concluded.

For example, “K1: three small dark objects on the left shelf below the sink; no animal seen; underside inaccessible” preserves information that “mouse infestation” would replace with an assumption. This is an illustrative entry, not a reported household case.

Keep an observation separate from its interpretation

“Four dark pellets below the cabinet” is an observation. “Four mice are living in the wall” is an interpretation that those pellets cannot establish. Keep both the visible evidence and your question, but do not merge them into a confirmed finding.

The same rule applies to stains, skin symptoms, or a sound behind a wall. EPA emphasizes physical evidence when investigating bed bugs because bites alone are a poor indicator. Let the quality of the evidence determine how specific the record becomes.

Record limits honestly

If a space was inaccessible, say so. If the photograph is blurred, keep it for location context but do not claim it shows a species feature. If a finding was reported by someone else, distinguish it from what you saw directly.

Do not disturb potentially contaminated material to complete a checklist. Suspected rodent waste needs CDC cleanup guidance; large wildlife accumulations may require qualified removal.

Decide when the record is complete

An initial record is complete when another person can locate the finding and understand the question. It does not need every field filled or an exact species name. Stop searching once further access would be unsafe or unproductive. Ask for an assessment using the professional question list.

After an assessment, use three separate outcomes: identified, unresolved, or no evidence seen in the stated areas. If a different pest is identified later, keep the original wording and add a dated correction. This preserves an honest timeline and prevents an uncertain first impression from becoming a permanent fact in your records.