Twin Cities trash is piling up so quickly, 4 landfills may need to expand Waste generation in the metro area was up 30% in the past year. Author: Twin Cities residents' garbage is piling up so quickly, its landfills are running out of space. The immediate fix, the Minnesota Pollution Control Agency (MPCA) says, is to make four south metro landfills larger. The agency this week detailed its proposed "short-term solution" to handle the flow of garbage going from area homes to nearby dumps. It involves expanding the garbage capacity at four landfills in the area by a total of 5.6 million tons, which would be allocated in this manner: