The application period for On-site Wastewater Treatment System Grants is now open. A total of $3 million is being made available to one or more qualified non-profit organizations, to assist homeowners in select Missouri watersheds with failing on-site wastewater treatment systems (septic systems and single-family lagoons). The funding will help reduce public health and environmental concerns related to untreated or minimally treated sewage and other household water rich in nutrients and bacteria entering Missouri’s watersheds and aquifers.
Deadline to submit an application and support documentation is June 30, 2026. The request for proposals, instructions and related materials are available on the department's Clean Water State Revolving Fund (CWSRF) On-site Wastewater Treatment System Grant webpage.