Tips for Short-term Rentals with Septic Systems
It is no surprise vacation rentals have been a hot investment item for the last few years, and the market continues to grow. With revenues generated in the $20-25 billion annually and a projected growth to $30-35 billion in the next five years, it is no surprise that many of these homes are served by on-site sewage facilities or septic systems.
For property owners in areas where septic systems are the primary method of waste disposal, the explosive growth of short-term rentals presents a unique set of challenges. Increased occupancy, higher water consumption, and a lack of understanding about septic system maintenance can put significant strain on these systems. This can lead to costly repairs, disruptions to the guest experience, and, in some cases, environmental damage.
If you’re a short-term rental owner with a septic system, it’s essential to understand the potential risks and take proactive steps to protect both your investment and the environment. Here’s what you need to know.
Why Short-Term Rentals Can Be Problematic for Septic Systems
Increased water consumption
On-site sewage facilities (septic systems) are designed to handle thewastewater load of a home based on its size and the number of occupants it would traditionally support. For example, a 4,500 sq. ft. four-bedroom home would be designed to accommodate 5 people. However, when these same homes are marketed to host 12-15 guests, with additional sleeping arrangements such as bunk beds, pull-out sofas, and inflatable mattresses, the septic system is often stretched beyond its intended capacity.
Impact on Septic Systems – Septic systems are not built to manage this type of increased load. More guests mean more water usage, which can overwhelm the system and lead toclogs, backups, or even system failure. Additionally, the increase in wastewater can cause turbulence in the septic tank, disturbing the sludge and scum layers and sending untreated effluent to the downstream components. This can lead to premature failure of your distribution lines and other crucial parts of the septic system.
Peak Loading During Turnover and Cleaning
Short-term rentals often experience high water usage during peak turnover periods when guests check out and cleaning crews prepare for new arrivals. This surge in water consumption—especially when there are multiple cleanings per week—can increase the overall volume of water entering the septic system. Along with this, cleaning chemicals and detergents can disrupt the balance of your septic system and contribute to the failure of your system’s biological processes.
Impact on Septic Systems: Septic systems are designed and constructed to allow for rest time in their operation. Extended rest times allow for increased retention in the tanks, which improves the system’s ability to treat the wastewater. When the rest and retention time is decreased and large volumes of water are introduced in short windows of time, solids in the form of scum and sludge can be displaced from the tank and introduced to the distribution components, thus potentially shortening component life and promoting system failure and increasing repair and replacement costs.
Renters’ Lack of Understanding
Another challenge for short-term rental owners is that many guests may not be familiar with the function of a septic system. Without proper guidance, renters are more likely to contribute to system damage through:
Overuse of water(e.g., long showers, excessive laundry). This situation can lead to the same conditions as it relates to rest and retention time in the tanks.
Flushing non-biodegradable items, such as sanitary wipes, feminine products, paper towels, grease, and oils. Non-biodegradable items can lead to reduced space in the tanks which further reduces retention time. Furthermore, these items do not break down inside the tanks which can increase pump out intervals. Also, should these items become lodged inside mechanical components, they can lead to shortened life of components which increases maintenance and service costs.
Impact on Septic Systems: These behaviors can easily overwhelm a septic system and introduce materials that it cannot process, leading toclogs, backups, and potential system failure. Even small, seemingly harmless actions—like using a garbage disposal—can exacerbate the strain on a septic system, as food waste that’s ground up may not break down properly in the tank.
How Short-Term Rental Owners Can Protect Their Investment
While short-term rentals can be a lucrative source of income, owners with septic systems need to take extra precautions to ensure their systems remain functional and efficient. Here are some practical steps to protect your property and avoid costly septic system issues.
Limit Occupancy and Implement Water Conservation Measures
One of the easiest ways to mitigate the strain on your septic system is by limiting the number of guests who can stay at your property. Avoid marketing your home as able to accommodate large groups—stick to the general guideline of 2 guests per bedroom. This will help maintain a manageable water load.
In addition, invest in low-flow fixtures for toilets, showers, and faucets to reduce water consumption. Low flush and dual flush toilets are especially effective at limiting the volume of wastewater entering your septic system. Consider restricting the use of washing machines or laundry facilities for guests. When washing bedding and linens, it is recommended they be taken to a commercial laundry service to minimize the load on your system, especially during periods of high turnover.
Provide Clear Guidance to Guests
Many guests are unfamiliar with septic systems, so it’s important to educate them on how to properly use the system. Clear signage can go a long way in reducing mishandling. Place signs in bathrooms and kitchens to remind guests of appropriate disposal practices, such as:
Don’t flush anything other than toilet paper.
Avoid using the garbage disposal.
Limit water usage during peak times (e.g., multiple people showering at once).
You can also include these guidelines in your welcome packet or house manual, so guests are aware of the house rules regarding septic system care before they arrive.
Schedule Regular Maintenance
Septic systems require regular maintenance, especially in high-traffic short-term rental properties. To keep your system functioning properly:
Schedule annual inspections to check for leaks, cracks, or signs of wear.
Pump the septic tank regularly, at least every 1-3 years, depending on the size of the tank and the volume of use.
Address any issues (e.g., leaks, running toilets) immediately to avoid unnecessary strain on the system.
Invest in Smart Monitoring Devices
For added peace of mind, consider investing in smart monitoring devices like SeptiLink, which provide real-time data on the status of your septic system. These devices can help detect problems early, such as high-water levels, or mechanical failures. Early detection can prevent costly emergency repairs and ensure that your system remains operational throughout the rental season.
Be Prepared for More Frequent Maintenance
Short-term rental properties in rural or suburban areas with septic systems should anticipate more frequent maintenance compared to traditional, owner-occupied homes. The wear and tear from higher water usage and guest turnover means that you’ll need to stay proactive in managing your system.
Conclusion: Protecting Your Septic System, Protecting Your Investment
As the short-term rental market continues to grow, owners with properties dependent on septic systems must understand the potential risks and challenges associated with higher water usage and fluctuating guest numbers. By following best practices—limiting occupancy, educating guests, maintaining your system, and investing in monitoring technology—you can protect your investment and avoid costly septic repairs or failures.
Remember, a properly functioning septic system not only ensures the comfort and safety of your guests but also protects the long-term value of your property. With the right precautions, you can enjoy the rewards of short-term rental ownership without the headaches of septic system issues.
Take Action Today
Are you a short-term rental owner with a septic system? Schedule a septic inspection today and be sure your property is ready for your next batch of guests! Taking the right steps now can save you time, money, and stress down the road.