- Where is Square Nail located?
- Square Nail is in Napa Valley, United States (2210 Napa Vallejo Highway, Napa, CA 94558. For more information view the ..., California State Water Resources Control Board (.gov), https://www.waterboards.ca.gov, PDF, california regional water quality control board, 17 May 2013 — The California Regional Water Quality Control Board, Central Valley Region (Central Valley. Water Board) finds:., Businesses, Venus Nails and Spa).