Sanitary Sewer Program

The Sanitary Sewer Program is based on the 1985 Sanitary Sewer Master Plan completed in 1985, and the City’s ongoing maintenance history and television scan (internal inspection) reports. With visual videoimages and written maintenance information, City staff identify and assess priorities of sanitary sewer projects needed to replace sections of the sewer system where the continued cost of maintenance of pipesand manholes would be greater than for replacement.

The Sanitary Sewer Program includes projects in twomain categories: "increased-capacity" projects for lines identified in the master plan as under capacity, and "replacement" projects for lines that have deteriorated past the reasonable point of repair. Planned CIP projects are intended to reduce infiltration and inflow of storm water into existing sanitary sewers and reduce deficiencies in aging sanitary sewer collection system, and to build extra-capacity in the system (upsize underground pipes and manholes) to accommodate new development and redevelopment.

Increased-Capacity Projects

The 1985 Sanitary Sewer Master Plan, and a subsequent master plan effort by Clean Water Servicesin 1995, is used by City staff to determine which projects are necessary to increase capacity of the sewersystem to serve new development and in-filling by redevelopment of existing land. The 1985 Sewer Master Plan identified approximately 51,000 lineal feet of undersized sewer pipe.

The City Council has approvedfunding on a yearly basis, for projects to correct the deficiencies identified in the master plan. By the end of FY 98/99, approximately 25,600 of the 51,000 total lineal feet of undersized pipe were replaced withproperly sized pipe, or pipe routing modified to increase system capacity. During FY 98/99 a total of 2,973 lineal feet of pipe were installed in this category.

Replacement Projects

The City’s sewer system is comprised of approximately 217 miles of piping ranging in size from 6" to 21".Much of this pipe in older sections of Beaverton is nearing or exceeding fifty years of service. A newprogram was initiated in FY 1995-96 to fund an ongoing program of replacing deteriorated or failing lines to ensure the integrity of the system in perpetuity. During FY 98/99 a total of 5,080 lineal feet of deteriorated sanitary sewer pipe were replaced.

Mapping and Master Plan

The Sanitary Sewer Master Plan is nearly 15 years old, and does not include a number of areas of the City that have been annexed since the plan was completed. Additionally, with 15 years of internal video inspection of sewer pipes and observations made of the system, City staff have discovered new information which warrants reevaluation of the sewer system master plan. Funds are included in the CIP to complete the process of reviewing and updating the master plan and sanitary sewer mapping.

Funding

The Sewer Program is funded by the Sewer Fund (502). "Increased-capacity" projects are financed from System Development Charges (SDCs) and "replacement" projects are financed from monthly sewer service charges.

Wastewater FAQs

For more information see Sewer Clogs—Frequently Asked Questions.

Aquifer, Storage and Recovery (ASR)

Cross Connection/ Drinking Water

Water Conservation

Water Quality Reports

Water Fluoridation

Utilities in Rights of Way

Utility Billing

Drinking Water Program

Sanitary Sewer Program

Storm Drainage Program

Utility Projects (CIP)

Drinking Water Supply

System Development Charges / Methodology

Water Questions?