In the field of wastewater treatment, certain misconceptions have been circulating for decades. Sometimes anecdotal, sometimes deeply rooted, they still influence important decisions when designing, installing, or using a septic system.
Yet behind these perceptions, the reality is often very different. A wastewater treatment system is far more than a simple installation buried underground, it is a complex balance between design, environment, usage, and long-term durability.
Here is an overview of some of the most common myths… and what the reality truly looks like in the field.
MYTH #1 – « A SEPTIC TANK CAN EASILY EXPLODE »
Reality: Although gases such as methane can form inside a septic tank, explosions are extremely rare. They generally occur only
under very specific conditions, often involving confined spaces or improper interventions.
In practice, a properly designed, ventilated, and correctly used system does not present this type of risk. (For more information: the ventilation)
MYTH #2 – « EVERYTHING FLUSHED DOWN THE TOILET GETS TREATED »
Reality: A septic system is not a universal solution for all types of waste. Wipes, grease, chemicals, and non-biodegradable solids can disrupt the biological process and accelerate clogging.
Proper system performance starts with good usage practices. (For more information: best practices for sustainable treatment)
MYTH #3 – « MIRACLE ADDITIVES IMPROVE THE SYSTEM »
Reality: In a properly designed system, the natural bacteria already present in wastewater are sufficient to ensure effective treatment.
In some cases, adding products may actually disrupt the biological balance rather than improve it. (For more information: septic system additives)
MYTH #4 – « A SEPTIC TANK NEVER NEEDS TO BE PUMPED OUT »
Reality: Over time, sludge naturally accumulates in any primary treatment unit and must be removed periodically to maintain the system’s efficiency.
It is important to understand that all septic solutions require primary treatment, which inevitably involves sludge pumping. However, not all technologies behave the same way during secondary treatment. Some systems also accumulate sludge in secondary stages or require periodic replacement of filter media. Others, particularly well-designed passive solutions, do not generate significant secondary sludge buildup and do not require component replacement. Maintenance is therefore an essential part of long-term durability, but its frequency and complexity depend directly on the technology chosen.
MYTH #5 – « ALL SEPTIC SYSTEMS ARE THE SAME »
Reality: The differences between technologies are significant: design, performance, durability, maintenance requirements, and sensitivity to variations in usage.
Two systems may appear similar during installation, yet deliver very different long-term performance and operating costs. Choosing a solution should therefore not be based solely on the initial purchase cost, but on a broader evaluation that includes durability, maintenance, and the overall lifecycle of the system. To better visualize these differences and compare available options, you can consult this comparison grid. Making an informed decision from the start can help avoid unexpected costs and interventions in the future.
MYTH #6 – « A LEACHING FIELD WILL ALWAYS CLOG QUICKLY »
Reality: A conventional leaching field can indeed become clogged after several years, mainly because it is not a treatment process in itself, but rather a wastewater dispersion area into the soil.
Without adequate pre-treatment, organic matter and suspended solids can gradually saturate the soil and reduce its infiltration capacity. In contrast, a system incorporating advanced secondary treatment significantly reduces this load before dispersion, directly helping extend the lifespan of the leaching field. Clogging is therefore not inevitable, but is often the result of poor technology selection or inadequate design. A rigorous engineering approach, combined with the right technological choice, helps maximize long-term system performance and durability.
MYTH #7 – « THE MORE COMPLEX IT IS, THE MORE EFFICIENT IT IS »
Reality: Performance does not necessarily depend on complexity. The most robust systems are often those based on simple, well-mastered principles.
Simplicity is often synonymous with reliability and durability.
MYTH #8 – « TREATED WATER CANNOT BE REUSED »
Reality: Depending on the treatment level and local regulations, treated water can be reused for several non-potable applications such as irrigation, landscaping, technical uses, and more.
Wastewater treatment can become a valuable resource rather than a constraint. (For more information: short guide on reuse)
MYTH #9 – « A SEPTIC SYSTEM IS COMPLICATED TO INSTALL »
Reality: What defines a good system is not its complexity, but the quality of its design.
As mentioned in our previous InfoDBO editions, a highperformance installation relies on a complete engineering approach rather than a simple assembly of equipment. (For more information: from design to installation, the importance of engineering in septic projects)
MYTH #10 – « ONCE INSTALLED, THERE IS NOTHING TO MONITOR »
Reality: A well-designed system is discreet and reliable in everyday operation. However, proper performance also depends on appropriate usage.
Certain practices, such as introducing unsuitable products or hydraulic overloading, can affect system efficiency. While a septic system does not require constant attention, it still relies on basic good practices and a minimum level of vigilance to ensure long-term durability. A high-performing system is, above all, a properly used system. (For more information: best practices for sustainable treatment)
MYTH #11 – « IT’S NOT AN IMPORTANT ISSUE »
Reality: Wastewater treatment directly impacts public health, environmental protection, and the value of infrastructure.
It is a fundamental issue, often invisible, yet absolutely essential. (For more information: why treat wastewater)
MYTH #12 – « SYSTEMS ARE NOISY AND PRODUCE ODORS »
Reality: Noise and odors are not inherent characteristics of septic systems, but rather the result of certain technological choices or specific conditions.
Regarding noise: it is generally associated with mechanical systems such as pumps or air compressors. Passive systems, which contain no mechanical components, operate completely silently. Regarding odors: under normal conditions, a properly designed and well-ventilated system should not generate noticeable odors. Ventilation typically relies on a chimney effect between the system and the roof vent, allowing gases to be safely discharged upward. When odors are present, they are often linked to external factors, for example:
- a poorly sealed septic tank lid
- a blocked roof vent (snow, ice)
- unfavorable wind conditions pushing gases back toward the ground
These situations are not specific to any particular technology and may occur with any type of system. Simple and appropriate solutions can usually resolve them quickly, such as installing an activated carbon vent filter or adjusting the ventilation system.
MYTH #13 – « IT’S VERY EXPENSIVE »
Reality: It is true that the initial investment may seem significant, especially for infrastructure that remains invisible. However, the true cost of a system should be evaluated over its entire lifecycle.
Some solutions, such as those offered by DBO International, can have an initial cost comparable to conventional systems while providing greater durability and avoiding costly replacements or interventions after only a few years. Better understanding the available options helps make a more informed and often more economical long-term decision. To better visualize these differences and compare available options, you can consult this comparison grid.
MYTH #14 – « BENOÎT BOUCHER, FOUNDER OF DBO, IS RETIRED »
Reality: A myth that has been circulating… and has practically become a classic since 2013.
It seems some passions are simply stronger than retirement. Because in reality, when someone has spent decades building and evolving a technology, they do not just disappear overnight!
CONCLUSION
There are many myths surrounding wastewater treatment, but they all share one thing in common: they oversimplify a reality that is, in practice, far more nuanced. A high-performing system does not rely on misconceptions, but rather on a combination of key factors:
- proper design
- rigorous installation
- responsible use
By questioning these common perceptions, it becomes possible to make more informed decisions, benefiting both the user, the environment, and the long-term durability of the installations.
Here’s the InfoDBO : Myths and misconceptions: separating fact from fiction in wastewater treatment
