HUH- 
I checked with the State Limnologist and asked if he knew of any environmental laws or rules the required a setback for firepits from surface waters.  He said that building a fire on the ice was prohibited but he knew of no law that required a setback for campfires.  He's been involved with water quality issues in NH for over 30 years.  If anyone would have known of such a requirement I'd expect him to know.  I'm pretty comfortable saying there is no such state requirement.  Maybe your town had something of their own.
		 
		
		
		
		
		
		
		
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