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December 08, 1210 Corvallis TMDL Stakeholder Briefing Summary (pdf)

August 17, 2011 Corvallis TMDL Wetland and Subsurface Treatment of Wastewater FINAL (pdf)

November 15, 2011 West and East Alternatives Due Diligence Evaluation (pdf)

Water Toxin Legislation Impacts Corvallis (April 2010)

Long-Term Wastewater Treatment Needs (June 2010)

UPDATE: Wastewater Regulations and TMDL Alternatives Evaluation Project (August 2010)

June 9, 2010 Public Workshop: THE ROLE OF RIPARIAN SHADING IN MEETING WATER QUALITY REQUIREMENTS

January 17, 2007

• Willamette River Total Maximum Daily Load Water Quality Regulations
• USC Minutes
• Council Minutes  (February 5, 2007) [Discussion begins on page 8]

February 6, 2007

The City of Corvallis retained Kennedy/Jenks Consultants to complete a Total Maximum Daily Load (TMDL) Alternatives Evaluation for the Corvallis Wastewater Reclamation Plant (WWRP) discharge to the Willamette River. The purpose of the project is to evaluate long-term compliance with current National Pollutant Discharge Elimination System (NPDES) Permit limits, assess the economic impacts of current and potential future regulations, and evaluate alternatives to direct Willamette River discharge. The evaluation consists of two Technical Memoranda (TM):

CITY OF CORVALLIS 
WILLAMETTE RIVER TOTAL MAXIMUM DAILY LOAD (TMDL) 
COMPLIANCE ALTERNATIVES PROCESS 

PUBLIC EDUCATION, OUTREACH, AND PLAN APPROVAL 
PROCESS AND SCHEDULE 

Prepared for the Urban Services Committee : October 12, 2009

Phase 1: Public Education and Outreach: 

1. Staff to present proposed overall Project Plan and Schedule to the Urban Services Committee (USC). 

The Willamette River TMDL Project is currently on hold due to the Environmental Protection Agency's disapproval of a key component of Oregon's water quality standard for temperature.  See the links below for more information.

Letter from the State of Oregon

May, 2013 Urban Services Committee Minutes

In some of the older sections of Corvallis, sanitary wastewater and storm water are collected in the same pipe. During wet weather, these combined flows can exceed pipeline and wastewater treatment plant capacity. This results in the overflow of a mixture of untreated wastewater and storm water (called "combined sewer overflows" or "CSOs") into the Willamette River. The City undertook a program to change this practice in order to respond to water quality issues and federal/state requirements that Corvallis remediate CSOs by December 31, 2001. 

Helping to prevent sewer overflows and backups is easy

Fats, oils, and grease can damage your home and the environment. Most of us know grease as the byproduct of cooking. Grease is found in such things as meat fats, cooking oil, shortening, sauces and dairy products. When these are washed down your sink, grease sticks to the insides of sewer pipes (both on your property and in the streets). Over time, it can build up and block the entire pipe. The results can be: