Each county must see that there is at least one solid waste collection and disposal system for the needs of county residents; at a minimum there must be one or more convenience centers, unless a higher level of service, such as household garbage pickup, is provided. The service is to be coordinated with those available from municipalities within the county and may be supplied directly by the county, by contract, or through a solid waste authority. The convenience centers must also comply with regulations developed by the Department of Environment and Conservation. T.C.A. § 68-211-851.