What is a Low Pressure Sewer System?
Low Pressure Sewer Systems are a low-head pressure wastewater collection and treatment system and an alternative to gravity sewer or a septic tank.
A Low Pressure Sewer System consists of an interceptor tank and a chamber unit, which houses a small, submersible electrical pump. The tank is installed below ground, much like a septic tank. Substantial organic waste treatment is provided energy-free in the interceptor tank. The liquid in the tank, or effluent, is pumped automatically through a small pressure line that transports it to a wastewater plant for treatment.
Low Pressure Sewer Systems have been in use since the late 1970's and are commonly used as an alternative to gravity sewer systems and septic tanks.
What are the Benefits of a Low Pressure Sewer System?
They are much less costly to install.
Pressure Mains can be installed on the side of roads - which avoids tearing up streets and expensive road work.
Pressure Mains smaller (2”- 4”), installed at about 4 feet in depth
There are no "Central Pump Stations" required.
Environmentally better as they have lower potential for Inflow and Infiltration
What are the Concerns of a Low Pressure Sewer System?
Each home has its' own individual grinder pump to maintain.
If zoning densities should increase, the low pressure system typically has less capacity for the additional flow.
Individual home owners could be affected by power outages.
Sizing of the sewer mains is more critical as the Low Pressure System requires two (2) f/s velocity to keep solids from settling out
Frequently Asked Questions with Low Pressure Sewer Systems
Will I hear the pump run?
No. The pump is a high-quality submersible pump. Every time you use approximately 100 to 150 gallons of water, the pump will automatically turn on and shut off. Based on normal water usage for a family of two, the pump will run for about two to three hours per month.
Who maintains the LPS system?
From the interceptor tank to the treatment plant, the system is maintained by your Homeowner's Association or a Municipal Utility District - this normally includes all parts and labor costs and includes pumping out the tank if solids build up. Any house plumbing problems are the cost and repair responsibility of the customer.
What happens if there is a power failure?
If the power is off, the pump will not operate. However, there is a reserve capacity in the interceptor tank which allows for approximately eight hours of normal use (excluding uses such as running a washing machine and taking a bath) before you will experience any difficulty.
Is there anything that should not go down the drain or toilets?
YES! To protect the Low Pressure System’s biological process and to help prevent house plumbing lines from clogging, do not dispose of the following items through the drains or toilets:
• No Feminine Hygiene products of ANY kind - this includes tampons, maxipads, minipads, or pantiliners, including those that biodegrade or those that begin to break down when exposed to water.
• Plastic or rubber of any kind
• Cigarette butts (filters will not decompose)
• Greases and cooking oils of all types
• Coffee grounds and other inorganic materials
• Excessive amounts of non-dissolving tissue paper or paper towels
• Excessive use of laundry detergent or soaps
• Human or pet hair
• Cloth of any kind
