What Is a Holding Tank?

A holding tank is a large, watertight container designed to store wastewater from your home or building until it can be pumped out and hauled away. Unlike conventional or mound septic systems, a holding tank does not treat or disperse wastewater onsite—it’s strictly for containment.

How Does a Holding Tank Work?

  1. All wastewater from your home—sinks, toilets, showers, laundry—flows into the underground holding tank.

  2. The tank fills up over time, depending on your water usage.

  3. When it reaches capacity (or a set level), a signal alerts you (often via an alarm or float system).

  4. A licensed hauler pumps out the contents and transports it to a treatment facility.

When Is a Holding Tank Used?

Holding tanks are typically used when:

  • Site conditions prevent the installation of a conventional or alternative septic system (e.g., extremely poor soil, high groundwater, or limited space).

  • The property is used seasonally or occasionally (like a cabin or vacation home).

  • The home is in an area with strict environmental or zoning regulations that limit onsite wastewater treatment.

Pros and Cons of Holding Tanks

Pros:

  • Can be installed on sites where no other system is viable.

  • Lower initial cost than more complex septic systems.

  • Ideal for part-time or low-use properties.

Cons:

  • Requires frequent pumping, especially for full-time residences.

  • Long-term costs for pumping and hauling can add up.

  • You must strictly manage water usage to avoid overflow.

Maintenance Tips for Holding Tanks

  • Monitor water use closely to avoid overfilling the tank.

  • Respond promptly to alarm alerts—never ignore a full tank warning.

  • Schedule regular pumping based on your usage.

Is a Holding Tank Right for You?

If your property can’t support a traditional septic system, a holding tank may be the answer. While it doesn’t treat wastewater onsite, it offers flexibility and code compliance in challenging situations.

Not sure whether a holding tank is the right fit? Our team can evaluate your site and help you determine the best wastewater system for your needs.