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Well driller counts derive from the Montana Bureau of Mines and Geology Ground Water Information Center, a public database of the well logs drillers file with the state. Records are as filed and may contain errors or omissions; about one in five well log records carries no company name at all, though for logs completed since 2000 it is closer to one in thirty-five. Septic installer and site evaluator listings are reproduced from county rosters for Flathead, Gallatin, Lewis and Clark, Park, Ravalli and Yellowstone counties; each list's date is on the septic page. Listings marked Featured are paid placements. Every other listing comes from public records, is free, and is not an endorsement. Cost figures are typical ranges for planning, not quotes. Permit rules and fees change; always confirm with the issuing agency.