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Pressure Distribution to a Soil Treatment Area:

Designs for pressure distribution systems must include:
  • Pipe diameter for transport lines and laterals.
  • Orifice size and spacing.
  • Dose size and frequency.
  • Float settings to achieve the required dose size for the tank selected.

Piping for pressure distribution may be hung in the top of chambers or placed on the floor. Orifices must be directed upward if using chambers with drainage holes at either end of the lateral line or alternative spacing to allow piping to drain between doses.

If used with rock and pipe, the lateral piping must have at least 6” of gravel placed beneath the pipe and 2” above the pipe.

Cleanouts are required at the end of each line on a system using pressure distribution. Valves like the one pictured below, or threaded caps may be used.

Systems utilizing a pump to lift wastewater to a soil treatment area at a higher elevation or to provide pressure distribution must meet Section 9.9 of the Larimer County On-Site Wastewater Treatment System Regulations. The following is a summary of the requirements:
  1. High level alarm and pump control floats must be mounted to a separate stem from the pump outlet piping. This allows the pump to be removed and serviced without altering the float settings.
  2. The discharge line must be protected from freezing through a weep hole placed on the outlet piping, directed down into the tank or drain back through the bottom of the pump. The piping must be sloped back to the tank or to the soil treatment area for drainage.
  3. A quick disconnect union must be accessible from within the riser of the tank. This allows the pump to be removed without cutting the outlet line or hanging down into the tank to make repairs.
  4. All electrical connections must be made outside of the tank and riser. Run electrical connections for the pump and floats outside the riser to prevent corrosion. Leave enough extra wire to allow for removal of components.
  5. The control panel must include a mechanism to track pump run time, or the number of pump cycles.
  6. A switch must be included in the panel that allows for manual operation of the pump.
  7. The control panel must mounted in a location where it is visible from the septic tank, and include an audible and visual alarm.


  • Control panels must be UL listed, and have the pump and high water alarm connected to separate control breakers.
  • The pump must be located in a screened vault, or an effluent screen provided in the chamber prior to the pump.

Septic Systems

Questions? Contact OWTS

(970) 498-6775