General
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With approximately 28,000 students and 5,000 faculty/staff members on the campus, OSU generates over 1.1 million gallons of wastewater each day.
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Most interior drains on campus lead to the City of Corvallis wastewater treatment plant while most exterior drains lead directly to Oak Creek or the Willamette River without pre-treatment.
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Interior and exterior drain disposal at OSU is regulated by the Federal Clean Water Act and the City of Corvallis Municipal Code.
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Civil and Criminal penalties can be incurred from improper drain disposal!
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No material qualifying as a hazardous waste may be disposed of in the drain.
Interior Drain Disposal Limits 
The following criteria apply to liquid wastes disposed of through interior drains:
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Liquids must have temperature of less than 150° F.
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Liquids must be non-flammable, having a flash-point greater than 140° F.
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Materials must not be viscous or solid which may clog plumbing.
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pH of all discharged liquids must be between 6.0 – 9.5
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Toxic, malodorous, or radioactive substances may not be drain disposed.
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No petroleum oils, dyes, heavy metals, or organic solvents.
Exterior Drain Disposal Limits
The following criteria apply to liquid wastes disposed of through exterior drains:
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Only clean rain runoff and de-chlorinated potable water may be disposed of in exterior drains.
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No chemicals or other materials may be disposed of through exterior drains.
For questions regarding what can and cannot be disposed of down a drain, contact EH&S at 541-737-2273