Also, a quarter of Brazilians live in dwellings with no access to a sewage network or septic tank, w'hile 7 % of dwellings have no access to piped water or wells. The perceived quality of public services, in particular in light of Brazil’s high tax burden (see Chapter 1), was one of the issues that prompted many Brazilians to take to the streets in June 2013, which highlights the importance of improvements in this area. Beyond that, for municipal services, the size of a municipality may not necessarily coincide with the most efficient scale at which to provide a given service, in which case there is scope to improve service efficiency by having several municipalities join hands for the delivery of services, but this involves significant coordination challenges.