Sewer Disposal Guidelines (Local Limits)

Sewer Disposal Guidelines

To ensure continued compliance with permit conditions and prevent problems from occurring at the wastewater treatment plant, the University has developed a comprehensive sewer disposal policy with specific sewer discharge limits for over 100 constituents of concern. The sewer disposal policy and discharge limits are known in the parlance of wastewater engineering as "Local Limits."

Local Limits – Numerical

Numerical Local Limits refers to the microgram/liter sewer discharge limitation established for UC Davis. These limitations apply at the point of discharge to the sanitary sewer system (e.g., laboratory drains). Wastewater exceeding any of these limitations cannot be discharged without specific approval from UC Davis Facilities Management, Director of Utilities.

  • Local Limit Examples of Constituents
  • CONSTITUENT

    Local Limit *
    ug/l
    (for each discharger)
     

    Aluminum

    87

     Ammonia-Nitrogen

    240,000

    Barium

    700

     Cyanide

    20

    Electrical Conductivity

    900 (umhos/cm)

Local Limits – Qualitative

Qualitative Local Limits refers to sewer limitation based on the physical properties of the substance.

  • Examples 
  • –colorful waste
    –excess quantities of oils or fats that may plug up sewer pipes
    –solid or viscous waste

Can this go down the drain?

The flow chart below provides a guideline for what may or may not be poured down the drain on campus.

can this go down the drain chart