Real Customer Service Rep

Serving San Francisco, Oakland, San Jose and the Santa Rosa Area

Mold Prevention:

How Property Managers Can Keep Moisture Problems
from Becoming a Notice of Violation

Mold Prevention for Property Managers

Mold problems rarely begin with mold.

They usually begin with something much smaller: a slow plumbing leak, failed caulking, a roof defect,
condensation around a window, an overflowing appliance, or a tenant’s report that did not receive prompt
attention.

Left unresolved, a manageable moisture problem can become damaged building materials, a tenant
complaint to the local authorities, a health concern – and eventually a Notice of Violation, commonly called
an NOV.

For property managers and facility managers, the goal is not simply to remove visible mold discoloration.

The goal is to identify the source of the moisture, correct it promptly, dry affected materials properly,
properly remediate the mold colonies, communicate clearly, and document every step.

In California, dampness and visible mold may be considered conditions of substandard housing when they
threaten occupants’ health. That makes prevention and a well-documented response essential – not
optional.

The moisture-response window

Early action protects building materials, occupants, and the management record.

Now

Acknowledge
Log the report and check
whether water is still
entering.

Hours

Contain
Stop the source, extract
water, begin drying, and
photograph.

24-48

Dry
Dry affected materials as
quickly as practical;
reassess hidden areas.

Close

Verify
Confirm source correction,
completion records, and
follow-up.

1. Treat Every Water Report as Time-Sensitive

A report of a leak, musty odor, discoloration, bubbling paint, or damp flooring should never sit unanswered.
Create a written response protocol that includes:

  • Acknowledging the report promptly
  • Recording when and how it was received
  • Asking whether water is still entering the property
  • Determining whether emergency containment is needed
  • Scheduling an inspection
  • Photographing the affected areas
  • Recording moisture readings when appropriate
  • Giving the tenant or occupant an update


The EPA recommends drying water-damaged areas and materials within approximately 24 to 48 hours
when possible. The longer materials remain wet, the greater the likelihood of mold growth and additional
damage.

Pro Tip: Even if the repair cannot be completed immediately, the property manager should direct containment, water extraction, drying, air filtration, and collect the documentation as soon as practical.

2. Find the Moisture Source - Do Not Treat Only the Stain

Cleaning or painting over visible mold without correcting the moisture source is not a solution.

Common moisture sources include:

  • Plumbing supply-line and drain leaks
  • Roof and flashing failures
  • Failed window or exterior-wall seals
  • Toilet, tub, shower, and sink overflows
  • Deteriorated grout or caulking
  • HVAC condensation or blocked condensate lines
  • Appliance leaks
  • Poor bathroom or kitchen ventilation
  • Water intrusion through foundations or below-grade walls
  • Irrigation or drainage problems
  • Elevated indoor humidity
  • Hidden leaks inside walls, ceilings, or cabinets
  • Little or no outside air changes to a closed living unit or room

The source should be identified and repaired before cosmetic restoration is considered complete.
When the source is uncertain, use qualified professionals and appropriate diagnostic methods rather than
guessing.

3. Create a Written Moisture-Response Plan

A strong response should not depend on which employee happens to be working that day.

Assign a moisture-response champion and identify a manager to whom that person reports. Establish
written procedures for:

  1. Receiving the complaint
  2. Assessing urgency
  3. Stopping or containing the water source
  4. Inspecting affected and adjacent areas
  5. Authorizing drying or remediation
  6. Communicating with occupants
  7. Documenting the work
  8. Confirming completion
  9. Conducting a follow-up inspection


Add recurring prevention tasks to a shared calendar and retain records in a central location.

A consistent system helps prevent missed steps and demonstrates that management responded
responsibly.

At the point where management recognizes the situation is most likely mold; they can engage a professional testing firm. These firms inspect the affected areas, take swabs and air samples, and observe where they detect the source of the food (drywall for example) and water the mold needs to survive are originating. They send these samples to a lab. A full written report is created with the lab analysis overview, lab results, including identification of the various mold strains, and their recommended protocols for resolving the problem. It is best practice (and mandatory once a NOV has been issued) to have this same firm perform final testing and publish those results. This is the best method to eliminate risk for the property manager and building owners. Having an independent third-party testing company oversee and confirm the work means there is no conflict of interest or incentive to cut corners or perform only part of
the job.

The property manager should arrange testing for hazardous materials, including asbestos and lead-containing products, while the mold-testing consultant is on site. This hazard information will be needed when the consultant and contractors write and carry out the mitigation protocols.

Engaging a certified mitigation contractor is also an option when management assumes the worst-case
scenario that mold is present and wants it eliminated. In these cases, the parties agree on an
industry-standard protocol, and the service provider documents its performance of the full remediation.
If finding the source is complex, leak-detection professionals specialize in that type of investigative work.

1

REPORT

Acknowledge + log

2

SOURCE

Stop + diagnose

3

DRY

Extract + monitor

4

REMEDIATE

Follow protocol

5

VERIFY

Inspect + document

4. Inspect the Places Where Moisture Hides

Visible mold may be only part of the problem.

Include moisture-prone areas in routine property inspections:

  • Beneath sinks and plumbing fixtures
  • Around tubs, showers, and toilets
  • Behind washing machines and water heaters
  • Around windows and exterior doors
  • Beneath rooftop equipment
  • Near HVAC condensate lines
  • Inside mechanical and utility rooms
  • Under carpeting near exterior walls
  • Around balconies, decks, and exterior penetrations
  • Inside vacant units
  • Along ceilings beneath roofs or upper-floor plumbing
  • In basements, crawlspaces, and parking structures


Watch for staining, peeling paint, swelling materials, corrosion, musty odors, condensation, and previous
patchwork repairs.

5. Maintain Ventilation and Control Humidity

Bathrooms, kitchens, laundry rooms, and other moisture-producing areas require effective ventilation.

Confirm that:

  • Exhaust fans operate properly
  • Fans discharge outdoors where required
  • Dryer ducts and exterior louvers are clear
  • HVAC systems are maintained
  • Condensate pans and drain lines are clean
  • Air vents are not blocked
  • Windows and exterior openings are properly sealed
  • Windows in bathrooms that are needed for ventilation are operable
  • Residents understand how to use available ventilation


Condensation is evidence that moisture is accumulating. Repeated condensation on windows, walls, pipes,
or ceilings should be investigated rather than dismissed as merely seasonal.

This is especially a problem in San Francisco with windows that are never opened and crowded living
spaces.

6. Communicate Clearly with Tenants and Occupants

Tenant communication is one of the most important parts of preventing a complaint from escalating.

Provide simple written instructions explaining how to report:

  • Leaks and overflows
  • Musty odors
  • Visible discoloration or suspected mold
  • Condensation
  • Plumbing backups
  • Ventilation failures
  • Damp carpet, drywall, or cabinets


When a report is received, keep the occupant informed. Explain what has been inspected, what temporary
measures are underway, when contractors are expected, and when the next update will occur.

Avoid dismissive statements such as “It is only mildew” or “Just wipe it with bleach.” Management should
not make assumptions about the type or extent of growth without an appropriate assessment. Never call it
“mold” until there is a test confirming that it is mold. “Discoloration” is a good generic work that won’t get
you in trouble.

A tenant who feels heard and sees organized action is less likely to conclude that the problem is being
ignored.

7. Document the Entire Response

Good work without good records can be difficult to prove later.

Maintain a file containing:

  • The original complaint or service request
  • Date and time of each response
  • Inspection notes
  • Photographs before, during, and after the work
  • Moisture readings, when taken
  • The identified source of water
  • Plumbing, roofing, or building-repair invoices
  • Drying and remediation records
  • Equipment logs
  • Tenant communications
  • Contractor reports
  • Completion photographs
  • Follow-up inspection notes


Document facts rather than opinions. Records should clearly show what was reported, what was
discovered, what was done, and when it was completed.

8. Use Qualified Professionals When the Situation Requires Them

A maintenance employee may be able to correct a small plumbing leak or clean a minor surface condition.

Larger, recurring, hidden, contaminated, or technically complicated losses require appropriate professional
assistance.

Consider professional evaluation when:

  • The moisture source cannot be identified
  • Water has entered wall or ceiling cavities
  • Porous materials have remained wet
  • Mold returns after cleaning
  • A large area is affected
  • Sewage or other contaminated water is involved
  • HVAC components may be affected
  • Occupants report health concerns
  • Containment may be necessary
  • Specialized drying or removal is required


The contractor should address the water source and affected materials – not simply apply a coating or
deodorizer.

9. Verify That the Work Is Actually Complete

A repair invoice does not necessarily mean the problem has been resolved.

Before closing the service request, confirm that:

  • The moisture source was corrected
  • Affected materials were dried or removed as appropriate
  • No musty odor or visible growth remains
  • Adjacent areas were inspected
  • Damaged finishes were restored
  • Ventilation is functioning
  • Final photographs and records are complete
  • The tenant received a completion update
  • A follow-up inspection has been scheduled when appropriate


Recurring mold usually indicates that moisture is still present or that affected material was not adequately
addressed.

10. If an NOV Is Issued, Respond Methodically

An NOV should receive immediate management attention.

Start by:

  • Reading the notice carefully
  • Identifying every cited condition
  • Confirming correction and inspection deadlines
  • Contacting the issuing department if anything is unclear
  • Assigning responsibility for each correction
  • Hiring qualified contractors
  • Preserving photographs, invoices, reports, and communications
  • Requesting required reinspections
  • Obtaining written confirmation when the violation is corrected


Do not assume that completing the physical repair automatically closes the case. Many jurisdictions require a reinspection, supporting documentation, or formal sign-off.

Because procedures and deadlines vary by city and county, confirm the requirements with the agency that
issued the notice.

Create a Culture of Moisture Prevention

Mold prevention should not begin when someone sees mold.

Train employees and vendors to report:

  • Active or suspected leaks
  • Water staining
  • Damaged caulking
  • Condensation
  • Musty odors
  • Blocked vents
  • Drainage problems
  • Repeated plumbing repairs
  • Swollen cabinets, baseboards, or flooring


Encourage tenants to report problems early, and make the reporting process easy.

When everyone understands that water intrusion is time-sensitive, small problems are more likely to
remain small.

Final Thoughts

The best way to prevent a mold-related Notice of Violation is to manage moisture before mold has the
opportunity to spread.

Property and facility managers who respond promptly, correct the source, use qualified professionals,
communicate with occupants, and maintain complete records are in a much stronger position to protect
their tenants, their buildings, and their owners.

The objective is not just to pass an inspection. It is to maintain a healthy building and show a clear,
professional record of responsible property management.