How to Test a Sauna or Gym Locker Room
The field version of our sauna-testing protocol: what to bring, where to swab, what to photograph, and what to do with the results when the facility shrugs.
The full protocol — why saunas grow what they grow, and the science behind the method — lives in Learn: How to Test a Sauna (and Document What You Find). This page is the checklist version: the walk-through you can run on your phone, in the room, in one visit.
Bring
- A consumer mold swab kit (see the Test category below) — check it is in date.
- Your phone, charged: photos and video are the evidence that outlasts everything else.
- A flashlight. The growth that matters is rarely in the open.
Run the room, in this order
- Photograph the room as found — wide shots first, then close-ups. Leave your phone’s date and location metadata on; your originals are evidence. (Anything we publish has metadata stripped; your archive should keep it.)
- Under the benches. Shine the light along the bench underside, the bench-box ceiling, and the wall behind it. Sweat drips down and pools there; that is where growth concentrates.
- Ask the access question. Is the bench fixed to the wall? Is there an access panel? If nobody can clean under there, that is a finding — photograph the construction and write down the date you observed it.
- Check for a floor drain. A wet room with no drain is a design defect. Photograph the floor.
- Swab where it is worst — bench underside, floor corners, grout lines in the steam room and showers, anywhere wood meets tile. Follow the kit’s instructions exactly; label each swab with the spot and the date, on camera.
- Film the sampling in one continuous take: the growth, the swab, the label. Continuity is what makes it hard to dismiss.
- Write the memo the same day: facility, address, date, time, what you saw, what you sampled, who you told. Facts only, no adjectives you cannot support.
What the result does and does not do
A kit identifies organisms present — in our founder’s Daytona case, Chaetomium spp., Aspergillus spp., and Nigrospora spp. That is evidence of presence and of housekeeping failure. It is not a spore count, not a dose, and not a medical finding. State it exactly that size and it is unanswerable.
Then put it where it counts
- Give the facility the result in writing and keep the copy and the date.
- File with the routes for your state from the Report It page — and file a report with us, photos included, so the facility joins a public record instead of a private shrug.
- If the sauna made you sick, treat that as its own trail: document symptoms with dates and see a medical professional. Facility records and medical records are two trails; you want both.
Tools for this job: Test — find out what is actually there
GOT MOLD?
Fit score 10/10 — our research rating of how well this program fits this site's readers
What it is: A do-it-yourself mold test kit with the laboratory analysis included — the kit price covers the lab fees and free two-way shipping, per the program's own page.
Why it is listed: It is the exact purchase a reader of this site is already looking for: sample it yourself, mail it in, get a lab identification back. The all-in pricing matters — no surprise lab bill after the swab.
Its limits: Like every surface kit, it identifies what is present where you sampled. It does not count airborne spores, measure a dose, or prove that a room caused an illness.
My Mold Detective
Fit score 9/10 — our research rating of how well this program fits this site's readers
What it is: A recognised do-it-yourself mold test kit brand with lab analysis of your samples.
Why it is listed: An established name readers encounter everywhere in this space, with an easy sampling process a first-timer can follow — a reasonable starting point for a documented record.
Its limits: Same class limits as any consumer kit: presence and identification at the sampled spots, not air concentration, not causation.
EnviroBiomics — ERMI & HERTSMI-2
Fit score 10/10 — our research rating of how well this program fits this site's readers
What it is: Laboratory dust analysis by PCR. You collect a settled-dust sample and the lab reports mold species DNA: the ERMI panel, and the narrower HERTSMI-2 score built from five species associated with water-damaged buildings.
Why it is listed: This is the reference dust test that mold-literate readers ask for by name — the one that appears throughout the serious literature and community documentation on water-damaged buildings.
Its limits: Dust is history, not a live exposure reading: it says what has settled over time, not what you are breathing today. The EPA developed ERMI as a research tool and has not validated it for routine home decision-making — treat scores as one documented input, not a verdict.
The Dust Test
Fit score 9/10 — our research rating of how well this program fits this site's readers
What it is: Mail-in dust PCR analysis covering 36 mold species, with an explanation-friendly report format.
Why it is listed: A premium, content-friendly test: the species-level report gives a household (and any professional they hand it to) something concrete to work from.
Its limits: Same dust-history caveat as every PCR dust test — settled dust over time, not today's air. The program's stated audience is practitioners and wellness professionals.
Ulta Lab Tests — mold allergy panels
Fit score 7/10 — our research rating of how well this program fits this site's readers
What it is: Direct-to-consumer laboratory testing for people — including mold allergy panels — that you order yourself without a doctor's visit first.
Why it is listed: Listed separately and deliberately: everything above tests the *building*; this tests *you*. Readers who were told 'it's just allergies' can put an actual lab result next to that claim.
Its limits: This is medical testing, and this site gives no medical advice. A panel result is information to take to a clinician — ideally one experienced with environmental illness — not a diagnosis and not proof of where an exposure happened.
Links may become affiliate links; affiliate money never buys scores, coverage, or silence — see our affiliate disclosure.
Documented something real? File a report — reports are reviewed, published as reports, and counted.