Onsite Sewage Treatment Program (OSTP)

A group of people outside standing over a soil pit.
Wooden cabin in a conifer forest next to a lake.
Architect working on construction blueprint in office.
Magnified image of the coronavirus.

The Onsite Sewage Treatment Program (OSTP) protects public health and the environment by improving wastewater treatment through research-based workshops, as well as outreach to homeowners, small communities, professionals and policy-makers. This program is part of the Water Resources Center

Resources for SSTS professionals

Resources for homeowners


  • New OSTP report on distilled spirits available

    October 17, 2022

    The Onsite Sewage Treatment Program (OSTP) conducted an assessment of three distinct types of commercial distilled spirits to understand how these products can impact the wastewater characteristics of restaurants, bars and distillery tasting rooms.

  • WRS student Elizabeth Boor targets CECs in wastewater research

    July 26, 2022

    In the Water Resources Center’s Onsite Sewage Treatment Program, graduate student Elizabeth Boor has been collecting septic tank sludge also known as “septage” as a key component to her thesis research.

  • A solution for sewer flies

    April 11, 2022

    When a homeowner complains about sewer flies, here’s how to locate breeding spots and eliminate them.