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Well driller counts derive from the Montana Bureau of Mines and Geology Ground Water Information Center, a public database of well logs filed by licensed drillers. 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 licensing rosters: Park County 2026 and Gallatin County February 2025. Inclusion is not an endorsement and nobody has paid to appear. Cost figures are typical ranges for planning, not quotes. Permit rules and fees change; always confirm with the issuing agency.