Unlike the City of Missoula, Missoula County does not have a central wastewater and drinking water system. Residents can, and have, created Rural Special Improvement Districts (RSIDs) or Special Districts to operate and maintain water and/or sewer systems that provide service to properties within the legally defined boundaries. Residents within these districts pay taxes directly towards the maintenance of the systems. They show up under the “special assessments” table on your tax bill.
All RSIDs are under the jurisdiction of the Board of County Commissioners. The Public Works Director, at the direction of the Board, manages and operates the districts.
If you have questions about a specific RSID, click on the name to see the contact information. If you have general questions about RSIDs, contact Brent O'Connor at 406-258-4832.
Current RSIDs
Lolo residents created Rural Special Improvement District #901 to operate and maintain a water and sewer system that provide service to properties within the legally defined boundaries. Click here to see the boundary, related reports and documents and more.
If you have questions about the Lolo RSID, contact Jasen Neese, Water and Wastewater Assistant Operator at the Lolo Sewer and Water Plant at 406-273-2733.
Rural Special Improvement District 8916 serves the El Mar area off of Mullan Road. Contact Greg Evison (406-396-9453) if you have questions.
Rural Special Improvement District 8918 serves the Lewis and Clark area in Clinton. Contact Greg Evison (406-396-9453) if you have questions.
Lewis and Clark RSID #8918 received approximately $89,000 from local American Rescue Plan Act funding from the Missoula Board of County Commissioners to improve the districts wastewater collection system. The county contracted with HDR Engineering, Inc to replace its failing system. The new system's cost was paid for with 100% ARPA funding and was at no cost to the 42 homeowners who use it. The system was installed in 2022 and includes a dosing tank, filter, valves and two new pumps.
Rural Special Improvement District 8925 serves the Sunset West area north of the Wye. Contact Greg Evison (406-396-9453) if you have questions.
This water system was created as a special district (not an RSID) in 2026 to serve Grass Valley Industrial Park in the Wye. It is listed as WYESD on tax bills.