Private Water Quality Facility Program

The goal of this program is to ensure that private water quality facilities function as intended and to educate property owners who own these facilities on the proper inspection and maintenance practices, which will keep the facility functioning properly.

Water quality facilities generally fall into two — vegetated and structural. Each type of water quality facility is designed to meet standards outlined in the Clean Water Services Design and Construction Standards. In general, stormwater passes through the vegetated facilities and a variety of stormwater pollutants and nutrients are filtered by the vegetation. In a structural facility, stormwater pollutants are removed through filter media such as perlite. There are also water quality maintenance holes (or manholes), which capture sediments and floatables prior to the discharge into either vegetated or structural water quality facilities.

In accordance with the National Pollutant Discharge Elimination System (NPDES) permit issued by Oregon Department of Environmental Quality (DEQ), we are required to identify owners of private water quality facilities, develop and implement an inspection program, and develop and distribute educational materials describing the purpose of these water quality facilities and the maintenance techniques to keep the private water quality facilities functioning.

Clean Water Services will visit your facility at least once every four years to inspect and consult with you about maintenance needed to correct any identified deficiencies. We will also send annual notices to remind you of your obligation to maintain your facility. CWS will always attempt to notify you before entering the property to perform inspections.

As the owner, you are responsible for inspecting your facility annually and performing maintenance to ensure your facility continues to function properly. If you receive a maintenance correction list from Clean Water Services that identifies deficiencies with your facility, you must develop a plan to correct the deficiencies.

Clean Water Services will work with each owner to comply with requests to address deficiencies identified during an inspection. The first step is to educate each property owner on the importance of maintenance and how to maintain their facility. The goal is to achieve voluntary compliance. If voluntary compliance cannot be achieved, we may implement an escalating enforcement process.

Every owner of a private water quality facility will receive an information packet that includes guidance on how to inspect and maintain their facility: 

• Examples of approved vegetation that can be planted in vegetated facilities.
• Fact sheets that help you identify invasive weeds and methods of control.
• Operation and maintenance plans that provide guidance on how to maintain each type of facility.
• A list of contractors who have completed specialized training on how to perform the necessary maintenance to ensure your facility functions properly.

This information is available on our website.

A well-functioning facility will reduce stormwater pollution from entering local waterways and can reduce localized flooding and erosion issues. Vegetated water quality facilities can also be beautiful and add to the aesthetic value of your property if maintained properly. Ultimately these facilities help protect water quality in the Tualatin River Watershed, a natural resource that provides drinking water and recreational opportunities in Washington County.