Low Pressure Sewer System N Main and NW 7th Place
On April 13th, 2022, bids were publicly opened for the first publicly owned low pressure sewer system installation within the City of Warrenton. The successful bidder was Bob McEwan Construction, Inc. The project completed at the end of October 2022.
The NW 7th and N Main area is too low of an elevation to be served by a gravity sewer system. Installation of a low pressure sewer system in this area will allow current and future home owners to connect to the city’s sewer system and not be reliant on septic systems.
The City of Warrenton owns and operates a wastewater collection and treatment system which serves its approximately 6,500 residents. The wastewater system sprawls to collect sewage from Fort Stevens State Park in the northwest to the Warrenton‐Astoria Regional Airport in the east. Much of the developed area served by the collection system is at a relatively similar elevation, resulting in the need for a wastewater collection system that now includes nearly 40 lift stations.
As the City continues to grow, development in areas that cannot be easily serviced by conventional gravity collection systems is becoming more likely. The City has developed a policy that allows for, and guides the use of, low pressure sewer systems when the use of a conventional gravity sewer system or forcemain and lift station is not feasible.
Low pressure sewer systems differ from more traditional gravity/lift station designs by using small individual pumps at each connection which pump the waste into a common/shared forcemain. The forcemain will generally be in the street, and will be public property, but the individual pumps will be located on private property and will be owned and operated by the individual customers.
