Mold decision tool.
An independent inspector or industrial hygienist collects mold samples; an independent laboratory analyses them. Gateway handles moisture assessment and remediation, using the independent findings to inform the scope.
Use the five questions below to describe the moisture problem and discuss whether an assessment or remediation scope is needed. The guide does not provide a diagnosis.
Try the tool
Should I test for mold or
go straight to remediation?
EPA says sampling is usually unnecessary when mold growth is visible. Ask an experienced independent inspector whether sampling would answer a specific question at your property; health concerns belong with a qualified health professional.
Mold inspection or remediation: five questions to consider
Use these questions to describe the moisture problem when you call Gateway. An inspection establishes the scope; this guide does not diagnose health conditions.
- Can you see suspected mold, or is there only an unexplained musty odor?
- Where is the affected material, and approximately how much is affected?
- Is a leak, flood, condensation or another moisture source still present?
- Has the problem returned after previous cleaning or drying?
- Do you need an inspection, documentation or a remediation scope before work begins?
Describe what you can see without disturbing affected materials. Call Gateway at (314) 947-3419, 24/7, or learn about mold remediation.
When testing is worth the cost
Three mold testing scenarios and what to do
Ask the independent inspector for a written sampling scope and quote, including laboratory fees. Gateway quotes remediation separately.
Hidden growth. If hidden mold is suspected, ask an experienced professional about a careful investigation. Sampling alone does not establish the full extent of hidden damage.
Health concerns. Consult a qualified health professional about symptoms or individual health circumstances. This tool does not diagnose illness or determine treatment from a mold species name.
Real estate transaction. Ask the relevant parties what inspection or documentation is needed. An independent report may inform the discussion but does not guarantee lender acceptance, a price change or completion of a sale.
Visible growth. EPA says sampling is unnecessary in most cases where mold is visible. The assessment should focus on the moisture source, affected materials and appropriate cleanup.
What happens next
What happens after the
mold decision tool result
If sampling is appropriate, an independent inspector or industrial hygienist collects the samples and an independent laboratory analyses them. Gateway uses the independent findings to inform moisture assessment and remediation.
If the tool suggests remediation may be needed, contact Gateway for an in-person assessment and scheduling. The tool does not establish the final scope, price or completion time.
If you are monitoring a moisture issue, address the source and check for continuing dampness or recurring growth. Do not assume existing mold will disappear when materials dry; contact an experienced professional if the problem persists.
Questions on the result? Call (314) 947-3419 or message us.
Book mold testing or remediation in St. Louis
Call Gateway to discuss the findings and confirm current availability.
Sources (reviewed 2026-09-10): www.epa.gov; www.epa.gov.