The technical details that most frequently dominate discussions of creatively designed development proposals in unsewered areas involve the treatment and disposal (or dispersal) of human wastes. In rural and semirural locations where sewage is limited or nonexistent, most or all new development is served by individual septic systems and often by on-site water supplies (wells). Concerns about water pollution have caused many communities to require large minimum lot sizes, which inadvertently promote sprawl, fragment natural resource lands, and effectively discourage social interactions among widely separated neighbors.