posted 15 years ago
your lawn, due to more aeration and better biological activity (organic fert, and perhaps your not biocide happy with anti-weed sprays, etc), is likely more humid than your neighbors.
it is possible that if your lawns are slightly upslope (just an inch or two over 50' can make a difference) that the condensation of dew ( fog is typically bottlenecked vapor trying to condense or evaporate) and your wet sidewalks are simply your lawn respiring.
the dead lawns next door, salted with chimcal fertilizers and weed and pest control rich, are biolgical wastelands that do not respire well, so create no dew.
that said, call the city and tell them you wonder if a waterline checkup is in order-its a least cost prevention - once you know its not an expensive or timely fix, you can start looking at it as an oppertunity to harvest the water for functional production.
first clue of a problem in line leaks-hows your bill been looking?