Why Hotels Need Water Management Programs: Understanding ASHRAE 188 and Legionella Prevention

Hotels rely heavily on complex plumbing systems to serve guests through showers, sinks, pools, spas, decorative fountains, cooling towers, and other water features. While these systems are essential to guest comfort, they can also create conditions where waterborne pathogens—most notably Legionella—can grow if not properly managed. Because hotels host travelers from around the world and often include large centralized water systems, they are considered a building type where water safety management is especially important.

Understanding Legionella Risk in Hotels

Legionella bacteria naturally occur in freshwater environments but can multiply within building plumbing systems when conditions are favorable. Warm water temperatures, low disinfectant residuals, biofilm buildup, and stagnant water are all factors that allow the bacteria to grow. When contaminated water becomes aerosolized through showers, spas, cooling towers, decorative fountains, or other devices that produce fine droplets, individuals can inhale the bacteria and develop Legionnaires’ disease, a serious form of pneumonia.

Hotels present several conditions that can increase this risk:

• Large centralized hot water systems

• Long plumbing runs and recirculating loops

• Low-occupancy periods that lead to water stagnation

• Guest room fixtures that may go unused for extended periods

• Recreational water features such as pools, hot tubs, and fountains

• Cooling towers associated with HVAC systems
  

Because guests frequently change and may include individuals with underlying health conditions, hotels must proactively manage these systems to reduce the risk of waterborne illness.

What Is ASHRAE 188?

ASHRAE developed ASHRAE Standard 188: Legionellosis – Risk Management for Building Water Systems, which provides the industry framework for managing Legionella risk in large building water systems.

ASHRAE 188 outlines a structured process for identifying risk within building plumbing systems and implementing controls to prevent the growth and spread of Legionella. Many public health agencies, insurance providers, and hospitality organizations now recognize ASHRAE 188 as the industry standard for Legionella prevention in large buildings, including hotels.

Developing a water management program that aligns with ASHRAE 188 can be time-consuming and technically complex. HD Water Solutions works directly with hotel engineering teams to develop, implement, and maintain compliant water management programs, helping facilities meet these standards without placing additional strain on internal staff. Our team provides the technical expertise needed to identify risk areas, establish control measures, and create documentation that aligns with industry guidelines.

When Hotels Should Implement a Water Management Program

According to ASHRAE 188 guidance and public health recommendations, hotels should implement a Water Management Program (WMP) if they have characteristics that increase the risk of Legionella growth and spread. These commonly include:

• Centralized hot water systems serving multiple floors

• Buildings with more than 10 stories

• Decorative fountains or water features

• Cooling towers or evaporative condensers

• Hot tubs or spas

• Complex plumbing networks or large water storage tanks
  

In reality, most full-service hotels, resorts, and large hospitality properties meet at least one of these criteria. As a result, developing and maintaining a water management program is widely considered a best practice for the hospitality industry.

HD Water Solutions currently

assists hotels by conducting facility risk assessments and system evaluations to determine where water management programs are required and what steps are necessary to comply with industry standards. By partnering with facility teams, we help ensure that hotels understand their risks and implement practical solutions to control them.

Key Elements of a Hotel Water Management Program

A water management program is a structured plan that identifies potential hazards within a building’s water system and establishes procedures to control them. While each hotel’s program should be customized to its plumbing layout and water features, most effective programs include several core components.

1. Establish a Water Management Team

The program begins with assembling a team responsible for managing water safety. In hotels, this often includes facility engineers, maintenance staff, building management, water treatment specialists, and external experts when necessary.

HD Water Solutions becomes an extension of the facility team, working alongside engineers and management to provide technical expertise, guidance, and support in maintaining water safety programs. This collaborative approach allows hotel staff to focus on daily operations while still maintaining a strong water safety strategy.

2. Map the Building’s Water Systems

Understanding how water moves through the property is critical. This includes identifying:

• Incoming municipal water supply

• Hot water heaters and storage tanks

• Recirculation loops

• Guest room plumbing branches

• Pools, spas, fountains, and cooling towers

• Ice machines and other water-using devices
  

A plumbing diagram or system flow map helps the team identify where hazardous conditions could occur.

Our specialists help facilities analyze plumbing infrastructure, identify potential risk areas, and develop clear system diagrams and documentation as part of the water management program. This ensures the entire team understands how the water system operates and where control measures should be applied.

3. Identify Potential Hazard Areas

Certain areas within hotel plumbing systems are more likely to support bacterial growth. These include:

• Low-flow or rarely used fixtures

• Dead legs in plumbing lines

• Storage tanks or mixing valves

• Cooling towers and evaporative condensers

• Spa and hot tub systems
  

Recognizing these locations allows facilities to implement monitoring and control measures.

We conducts professional system evaluations and water testing to identify areas where biofilm buildup, stagnation, or temperature conditions may allow bacteria such as Legionella to grow. This proactive approach helps facilities address potential problems before they escalate.

4. Establish Control Measures

Control measures help prevent conditions that allow Legionella to grow. Common controls include:

• Maintaining appropriate hot water temperatures

• Ensuring disinfectant residuals are present throughout the system

• Routine flushing of infrequently used fixtures

• Cleaning and maintenance of cooling towers and water features

• Preventing biofilm and sediment buildup within pipes
  

We engineer custom disinfection systems and implement ongoing disinfection and treatment strategies designed to maintain safe water conditions throughout the plumbing network. These systems provide consistent disinfectant residuals and help reduce biofilm, making it more difficult for Legionella and other waterborne pathogens to establish themselves in the system.

5. Monitor and Document System Performance

A water management program requires ongoing monitoring and documentation to confirm that the system remains within safe operating limits. This may include:

• Measuring temperature and disinfectant residuals

• Performing periodic water quality testing

• Inspecting mechanical systems and water features

• Documenting maintenance and corrective actions
  

Our team provides routine water quality testing, reporting, and professional recommendations, allowing facilities to track performance and maintain proper documentation for their water management programs. These reports help demonstrate that the hotel is actively monitoring and managing its water system.

The Importance of Flushing and Water Movement

One of the most common contributors to Legionella growth in hotels is water stagnation. When rooms remain unoccupied or certain fixtures are rarely used, water can sit in pipes long enough for disinfectant levels to dissipate and bacteria to multiply.

To prevent stagnation, many hotels implement routine flushing procedures, particularly during periods of low occupancy. Running both hot and cold water at sinks and showers helps move fresh water through the plumbing system and maintain disinfectant residuals.

We partner with engineering and facilities departments by developing flushing protocols and monitoring strategies to ensure water continues to circulate through the system and maintain proper disinfectant levels.

Responding to Legionella Detection

If Legionella is detected within a hotel’s water system, the water management program should outline specific corrective actions. These may include additional flushing, system disinfection, targeted remediation, and further monitoring to ensure the issue is resolved.

We specialize in rapid Legionella remediation and biofilm removal from potable water systems. Our team works quickly to identify contamination sources, implement corrective actions, and restore the safety of the water system while working closely with facility management throughout the process.

Protecting Guests Through Proactive Water Management

For hotels and hospitality properties, water safety is an important part of maintaining guest trust and protecting public health. Implementing a structured water management program aligned with ASHRAE 188 helps facilities identify potential risks, maintain safe plumbing systems, and respond quickly if issues arise.

By partnering with experienced water safety professionals like HD Water Solutions, hotels can significantly reduce the operational burden of managing these programs while ensuring their water systems remain safe, compliant, and well-maintained. Working together, facilities and water safety experts can create a proactive approach that protects guests, staff, and the reputation of the property.