Sources & methodology

We prioritize primary government and professional guidance and avoid presenting informal industry “cutoffs” as federal standards.

• U.S. EPA — Mold Testing or Sampling
• U.S. EPA — A Brief Guide to Mold, Moisture and Your Home
• U.S. EPA — Mold Remediation Guide, Sampling chapter
• U.S. EPA — Mold Image Library
• OSHA — A Brief Guide to Mold in the Workplace
• OSHA — Mold Standards and consensus guidance

Editorial approach

When no official health or regulatory threshold exists, we say so. We explain comparisons and patterns as context, not as diagnoses or compliance determinations.