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Causes and Solutions for Condominium Odor Problems | Preventive Measures for Sewer and Other Bad Odors That Property Managers Should Know

This article explains the causes of unusual and unpleasant odors in condominiums, including drainpipes, pets, and tobacco, along with practical solutions. It also outlines the risk of reduced property value if the issue is left unresolved and the preventive measures property managers and owners should take.

Last updated: About 2 min read

Odor problems in condominiums are a frequent source of tenant complaints.Because the cause can be difficult to identify, and leaving the issue unresolved can lead to health concerns, declining property value, and disputes among residents, property managers and owners need the knowledge to respond promptly.

What are the main causes of odors in condominiums?

The appropriate response differs depending on the type of odor. Accurately identifying the cause is the first step toward a solution.

Problems with plumbing fixtures and drainpipes

The most common cause of odor complaints is a sewer smell.In many cases, the cause is a problem with the drain traps or drainpipes in toilets, bathrooms, and kitchens, and when trap seals dry out because of long vacancies or when drainpipes become clogged or damaged, unpleasant odors can enter the room. There are also cases in which odors from drainage facilities in shared hallways make their way indoors.

Inadequate waste and garbage area management

Improper disposal of food waste and insufficient cleaning of shared garbage areas can causeunpleasant odors to become especially strong during summer and the rainy season.Properties that allow 24-hour garbage disposal require more frequent management, so extra care is needed. These conditions can also become a source of fruit flies and cockroaches.

Pets, tobacco, and cooking odors

Body odor and waste odor associated with pets can easily become chronic, and one issue is that the people involved often do not notice them themselves. Tobacco-related issues can easily develop into disputes because they also involve health concerns, and making a property smoke-free is a fundamental solution.For owners, an important measure is to clearly define whether pets are allowed and to establish clear management rules.

Nearby restaurants and harassment

Odors from outside restaurants, such as yakiniku establishments, are not the tenant's responsibility, and these cases can be difficult to resolve fundamentally.When an odor problem continues for a long time without resolution, it is also necessary to investigate with the possibility of harassment by nearby residents in mind.

The most common odor is a "sewer smell" - causes and solutions

Check the function of the drain trap (water seal)

A water seal is the water that is constantly retained in a drain trap, and it plays an important role in preventing sewer odors from flowing back into the room.In plumbing fixtures that have not been used for a long time, the water seal can easily dry out, and in many cases the issue improves simply by running water.For properties that have been vacant for an extended period, checking all plumbing fixtures before move-in is essential.

Cleaning drains and drainpipes

Sludge buildup in drains, the absence of a bell-shaped trap, and clogged drainpipes are major sources of sewer odors.From a management standpoint, it is important to encourage consultation with the condominium association or a specialist contractor and not allow untrained individuals to clean drainpipes, because doing so can damage the pipes.

Drainpipe damage and water leaks

Cracks in drainpipes or damage caused by earthquakes can become serious cases in which odors permeate walls and pillars.If a sewer smell appears after an earthquake, it is necessary to arrange an inspection by a specialist contractor without delay.

Risks of leaving odor problems unresolved

Leaving odor problems unresolved creates two major risks.First, it can cause health concerns for tenants, including loss of appetite, headaches, and psychological stress, due to ammonia odors, tobacco smells, and similar issues. Second, if unusual odors are detected during a sale appraisal, substantial price reduction negotiations and buyer hesitation may occur, leading to a decline in property value.Early detection and early action protect an owner's assets.

Frequently Asked Questions (FAQ)

Q1. If there is a sewer smell in a condominium, can the tenant deal with it on their own?

A. If the cause is a dried-out water seal, simply running water may resolve the issue. Dirt in drains can be cleaned by the tenant using baking soda and citric acid. However, if the cause is a clogged or damaged drainpipe, the tenant should consult a specialist contractor or the condominium association.

Q2. If a pet causes an odor problem, will the repair cost be charged to the tenant when they move out?

A. If pet-related odors have permeated the floor or walls, there is a strong possibility that the cost will be charged to the tenant as damage exceeding ordinary wear and tear. Stating this clearly in a special agreement before move-in helps prevent disputes.

A. The fundamental measure is to clearly state in the management rules and lease agreement that the property is non-smoking. After a smoker moves out, cleaning the wallpaper and air conditioner is essential.

Q4. If a property with an odor problem is sold, how will the price be affected?

A. If unusual odors are detected during the on-site inspection, they can lead to price reduction negotiations or buyer hesitation. Identifying and resolving the cause before the sale helps maximize the sale price.

Q5. What management practices help prevent odors in properties that remain vacant for a long time?

A. Conduct regular ventilation about once a month, run water through all plumbing fixtures, and check drains. Using a vacancy management service can help ensure these tasks are carried out reliably.

Daisuke Inazawa, President & CEO of INA&Associates Inc.

Author

President & CEOINA&Associates Inc.

President & CEO of INA&Associates Inc. Leads real estate brokerage, rental leasing, and property management across Greater Tokyo and the Kansai region. Specialises in income-property investment strategy and advisory for ultra-high-net-worth individuals.

Daisuke Inazawa is the President and CEO of INA&Associates Inc., a Japanese real estate firm headquartered in Osaka with a Tokyo branch. He leads the company's three core businesses — real estate sales brokerage, rental leasing, and property management — across the Greater Tokyo Area and the Kansai region.

His areas of expertise include investment strategy for income-generating real estate, profitability optimisation of rental operations, real estate advisory for ultra-high-net-worth individuals (UHNWIs) and institutional investors, and cross-border real estate investment. He provides data-driven, long-horizon advisory to investors in Japan and overseas.

Under the management philosophy "a company's most important asset is its people," he positions INA&Associates as a "people-investment company" and is committed to sustainable corporate-value creation through talent development. He also writes and speaks publicly on leadership and organisational culture in times of change.

He has passed eleven Japanese professional qualification examinations: Licensed Real Estate Broker (Takken), Certified Real Estate Consulting Master, Licensed Condominium Manager, Licensed Building Management Supervisor, Certified Rental Housing Management Professional, Gyōseishoshi Lawyer (administrative scrivener), Certified Personal Information Protection Officer, Class-A Fire Prevention Manager, Certified Auctioned Real Estate Specialist, Certified Condominium Maintenance Engineer, and Licensed Moneylending Operations Supervisor.

  • Licensed Real Estate Broker (Takken)
  • Certified Real Estate Consulting Master
  • Licensed Condominium Manager
  • Licensed Building Management Supervisor
  • Certified Rental Housing Management Professional
  • Gyōseishoshi Lawyer (Administrative Scrivener)
  • Certified Personal Information Protection Officer
  • Class-A Fire Prevention Manager
  • Certified Auctioned Real Estate Specialist
  • Certified Condominium Maintenance Engineer
  • Licensed Moneylending Operations Supervisor