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Investigation was made on the influence of environmental survey borehole drilling and geothermal fluid blowout/reduction on the spa. The surveyed Kaminoyu and Santai Area was an area of about 70 km(sup 2) in the southeastern part of Yagumo Town and northwestern part of Mori Town. Both those towns are located about 50 km to the northwest of Hakodate City. Four spas were surveyed which had been all fluctuation-surveyed in hot-string water temperature, amount of discharge and chemical composition during the fumarolic environment survey in fiscal 1990. The chemical composition obtained under fumarolic state during the present survey in fiscal 1992 was compared with that done under prefumarolic state during the above previous survey. As for the classification in quality, Kami Spa is a sodium-chloride/sulfate hot-spring, while Simo Spa, Kinkon Spa and Ginkon Spa (Well No.1) are sodium-chloride/hydrogen carbonate hot-springs. Their chemical composition was identical with that in the prefumarolic state without any change confirmed. As for the liquid properties, they are neutral or weakly alkaline. Judging from their fluctuation in amount of discharge which remained within its prefumarolic range, there is no essential change. It is judged that all the fountainheads originate in the same geothermal fluid of deep subsurface ground, mix with surface water, remain in their respective reservoirs and discharge. 3 refs., 6 figs., 10 tabs.