NSPIRE mold standard: levels, deadlines and what to document

NSPIRE is not a general federal mold limit. It is HUD's physical inspection standard for HUD-assisted and HUD-insured housing, and it scores what an inspector can see and measure on the day. That makes a well-documented mold and moisture inspection directly useful to owners, managers and PHAs preparing for it.

What counts as a "mold-like substance"

The standard describes regular or irregular patches or spots that can be a different color from the surface (white, green, yellow, gray, brown or black), can be raised, are generally made of minute filaments, and can look fuzzy or cottony, sometimes with a musty or earthy odor. It includes what is often called mildew. Algae, which are grass-green, are not mold-like substances.

It applies in the unit and inside common areas, not outside. HUD lists areas where there could be water intrusion or captive moisture: walls, floors, ceilings, bathrooms, kitchens, bedrooms, closets, basements, laundry rooms, mechanical rooms and anywhere wood, drywall and moisture are present.

The four deficiencies and their deadlines

The inspector estimates the area of every patch and spot and adds them up for each room. The correction timeframe depends on the level and on whether the room is in a unit or an inside common area; Housing Choice Voucher (HCV) inspections have their own pass or fail column.

HUD defines the categories this way: Life-Threatening deficiencies present a high risk of death; Severe ones a high risk of permanent disability or serious injury or illness; Moderate ones a moderate risk of an adverse medical event needing a healthcare visit, temporary harm, or causing or worsening a chronic condition; and Low ones are critical to habitability but not a substantive health or safety risk.

The moisture meter rule

Deficiency 4, elevated moisture level, starts with a visual check for peeling paint or wallpaper, a warped or stained wall, or a buckled, cracked or water-stained ceiling, carpet or wooden floor. If that evidence is present, the inspector tests with a pinless moisture meter. Infrared cameras are optional and are not used on their own: if a thermal camera shows an anomaly, the moisture meter must confirm whether elevated moisture is present. An active leak is assessed under the separate Leak – Water or Leak – Sewage System standard.

Related standards: ventilation and heating

Two other NSPIRE items often explain why mold is there. The Ventilation standard (V3.0) makes it a deficiency when a bathroom has neither an exhaust fan, an openable window, nor another adequate means of ventilation or dehumidification that is present and operable (Moderate, 30 days; HCV Fail). An exhaust fan that does not respond to its switch, or has restricted airflow, is also a deficiency.

HVAC is one of the new affirmative requirements HUD starts scoring on October 1, 2026 in Public Housing and Multifamily inspections. Between October 1 and March 31, a working permanently installed heating source with an interior temperature of 64 to 67.9 °F is a defect, and a heating source that is not working, or an interior temperature below 64 °F, is a more serious one. Cold rooms and condensation go together, so the same temperature reading can serve both.

Which programs, and when

How a mold and moisture inspection supports NSPIRE

An independent inspection does not replace the HUD, PHA or program inspection, but it can find and explain the conditions NSPIRE scores before that inspection happens, and show what was done about them. Useful things to document:

• Area per room: measure or estimate each patch and add them up by room, with photos that include a scale reference, so the level (over 4 sq in, 1 sq ft or 9 sq ft) is clear.
• Moisture readings: record where you tested and the readings, with the visual signs that led you there.
• The cause: leaks, missing or failed bathroom ventilation, or condensation on cold surfaces. Temperature and relative humidity give a dew point that shows whether surfaces are cold enough for condensation.
• Heating season temperatures: from October to March, the interior temperature you recorded also bears on the HVAC requirement.
• After the fix: dated photos and readings after cleanup and repair show the deficiency was corrected.

Where DampApp Pro fits

• On site and offline: record each room, wall and defect with moisture readings and photos, with no signal needed in basements or crawl spaces.
• °F or °C: enter temperature and relative humidity and the app calculates dew point on the device.
• Fan schedule: record each exhaust fan's location, type and whether it worked when tested.
• Dated photos: the report can show each photo's capture time from its EXIF data, or the time it was added.
• A PDF before you leave: the report is built on your device, with optional AI help to turn shorthand into clear wording you check.

Free to start: surveys work offline and free PDFs carry a small app footer. Pro adds your own branding, cloud sync and the full toolkit.

Frequently asked questions