System Development Charges (SDCs) and Connection Charges

System Development Charges

(rates effective 7/1/2022)

Sanitary Sewer System Development Charge (Rate Zones 1 and 2) $8,600
Surface Water System Development Charge (Rate Zone 2) $233

Sanitary Sewer Tap In - 4"

North Clackamas Service Area $125
Hoodland Service Area $150
Boring Service Area $125

Sanitary Sewer Tap In - 6"

North Clackamas Service Area $150
Hoodland Service Area $175
Boring Service Area $150

System Development Charges FAQ


System Development Charges are one-time charges assessed when customers connect to system. These charges help pay for the sanitary sewer and surface water infrastructure required to meet growth-related needs. The current sanitary sewer SDC fee is $8,600 per equivalent dwelling unit (EDU) for each new sanitary sewer connection throughout the WES Service Area. The current surface water SDC fee is $233 per equivalent service unit.

Adjustments to these rates are made during the budget process and go into effect each July 1.


Based upon the recommendations received from the WES Advisory and Budget Committees, the Board of County Commissioners, whom also serve as WES’ governing body, approves SDC rates. Rates are adopted to offset the impacts of growth on infrastructure while maintaining the competitiveness of local businesses.


SDCs are paid when property owners request new or expanded sewer service connections though building permits issued by cities or the county.  Some of those payments are collected by cities and routed to WES, while some are paid directly to WES during the permitting process. 


Projects that do not increase the use of or impact the sewer system are exempt from SDCs. 

Credits are available for projects that offset the impact of the new connection on the system, such as when commercial and industrial users recycle wastewater and stormwater. 

Waiving SDCs is not an option. 


Each year WES goes through a budget process, typically from January through June, to establish rates for the following fiscal year (July 1 to June 30).  Public meeting notices are published, inviting the public to comment on the proposed rates and fees before the budget is adopted. A notice regarding the SDC rates is published as required by applicable law.

Community members are welcome to attend budget committee meetings or to testify at a Board of County Commissioners Business meeting before the budget is formally approved in June.  

In addition, the Commissioners seek feedback from ratepayers, elected officials, developers and business representatives that serve on the WES Advisory Committee. 


If you have any questions about the foregoing, please contact us at 503-742-4567 or



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