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WATER RESOURCES MANAGEMENT W/12/81 limited geographic areas, such as shorelines, Policies leaving the regulation of most on-site systems up to the local governmental units. 38. Thaon*ftWstm maimigement and control program for4twWlat opoiitan Arm should'be Following extensive study and analysis, the MPCA .designed to_Rrgt,and promote water adopted a regulation governing a sizable share of all quality_ d6 otect and-promote the health, on-site systems. This regulation, WPC 40 (6 MCAR safety,. d-wel pf all Metropole _� .. � ton:&ea 48040), became effective on August 21, 1978. It applies only to large-scale systems and state facility -,q,.,,+¢�,� ,;,a:,,.. ,,•�. �, _ installations. The provisions will be used by the 39. The on-site system management and control' DNR in determining the adequacy of local program for the Metropolitan Area should be ordinances and programs for shorelands and cost-effective,simple, understandable floodplains. Nevertheless, most on-site system and sufficiently uniform to ensure simple and installations are still not regulated by the State of consistent administration throughout the Minnesota. However, the MPCA and others Metropolitan Area. recommend that WPC 40 be used as a model for a local program of on-site system management and 40. The on-site system management and control control. program for the Metropolitan Area should promote public and private activities designed WPC 40 provides an excellent solution to a large to provide for the appropriate utilization of part of the management and control program needs such systems, minimize the risk of problems involving on-site systems throughout the state. resulting from the use of such systems,and correct existing on-site system-related WPC 40 establishes technical and design require- problems. ments for new on-site systems, both standard and alternative types, and their installation. Phases of a Local On-site Management Program It does not, however, provide a total solution to the needs either within the Metropolitan Area or Planning or Preinstallation Phase elsewhere. The regulation does not deal with existing on-site systems, including recertification The first step in developing an effective local of such systems. Nor does it provide for the management program is to relate the use of on-site monitoring, maintenance or inspection of new systems to a community's general land use pian systems, or establish provisions for local program and development program, including density administration, enforcement, remedial actions, of developments. Communities are responsible for planning, etc. It is important that any management developing a comprehensive development plan and control program for any part of the state be under the requirements of the Metropolitan Land consistent with the provisions of WPC 40. Planning Act. A community's land use plan and Although duplication might be possible, it would land use controls should address the issue of what be inappropriate and impractical legally to have role on-site systems should plan in a community's on-site requirements that vary substantially from future development. those contained in WPC 40. Rural areas that have and intend to continue rural An examination of the past history-of on-site development densities (that is, a range of one unit systems reveals that failures can and do happen. per 10 acres to one per 40 acres) will not be The existing metropolitan-wide management expected to have as stringent a program covering structure for on-site systems is perhaps best operation, maintenance and postinstallation described as loose and uncoordinated, although inspection as rural areas having or proposing urban there are some exceptions. This combination gives or urban-like development densities (that is, a the public poor assurance that pollution or public range of one unit per 21/2 to one per five acres). All health hazards caused by on-site systems will not communities are expected to adopt the require- occur in the future. ments of WPC 40 for new installations, regardless of development density (see Table 1). 22