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winni83 · 06-24-2018, 02:21 PM

I think it depends on what the driveway surface is now, assuming it complied when installed. See the NH DES FAQ under impervious surfaces; link below. When we did our house I was surprised to learn that pavement and gravel or stone are all considered impervious.

https://www.des.nh.gov/organization/...s/faq.htm#faq7

06-24-2018, 02:21 PM	#6
winni83 Senior Member Join Date: Nov 2009 Location: Moultonborough, NH Posts: 423 Thanks: 17 Thanked 212 Times in 134 Posts	I think it depends on what the driveway surface is now, assuming it complied when installed. See the NH DES FAQ under impervious surfaces; link below. When we did our house I was surprised to learn that pavement and gravel or stone are all considered impervious. https://www.des.nh.gov/organization/...s/faq.htm#faq7