[0zemp1c]

Well one example is infrastructure...if a formerly-rural area gets a gradual accumulation of homes, chances are they are all on septic systems...so people are using their property for waste water recycling, and there is a limit to how dense this type of living can be.

I grew up just outside a decent-sized city in Canada, now living in Texas...both places, on septic. Its not rare.

[CalRobert]

Right, but that's one of the reasons to make it easier to build infill development, which is largely illegal due to zoning, parking minimums, height maximums, etc.

I live on 3.5 acres and have a water treatment system and part of the reason is that there's a shortage of homes I _actually_ wanted, which are decent flats in the city where my kids can bike to school, so they're very expensive.