[Torayvino® | National Survey on Water and Tap Water] Kumamoto Prefecture Ranks 1st for 'Affinity with Water,' Nagano Prefecture Ranks 1st for 'Overall Tap Water Satisfaction'

Toray Industries, Inc. (Headquarters: Chuo-ku, Tokyo; President: Mitsuo Ohya) has conducted and released the results of a 'National Survey on Water and Tap Water' covering all 47 prefectures. This survey was conducted as part of the 'Water Ring Project,' launched to commemorate the 40th anniversary of Toray's home water purifier brand 'Torayvino®' in 2026, aiming to clarify public awareness regarding tap water during the new lifestyle season.

【Survey Topics】

・Approximately half of the Japanese population feels an affinity for their local water. Kumamoto Prefecture leads with over 80%.

・Reasons for affinity with water vary by region, including 'taste,' 'natural environment,' and 'brand image.'

・There is a regional gap of up to 44.4 points in tap water satisfaction, with Nagano Prefecture at 99% (1st place) compared to Okinawa Prefecture at 54.6%.

・The awareness rate of 'PFAS,' which has become a social issue, is 64.5%, meaning about 2 out of 3 people are aware of it.

・Growing interest and anxiety regarding 'PFAS': about 60% of those satisfied with their tap water also responded that they are 'concerned' about it.

【Survey Overview】

・Area: All 47 prefectures in Japan

・Target: 4,700 men and women aged 20–59 (100 per prefecture)

・Period: October 2025

・Method: Internet survey

・Conducted by: Toray Industries, Inc.

*When citing these results, please credit 'Toray Industries' as the source.

*Percentages are rounded to the nearest decimal point, so totals may not equal 100%.

【Survey Results Details】

《Topic 1 | General Water Survey Results》

▼ Approximately half of the Japanese population feels an affinity for their local water. Kumamoto Prefecture leads with over 80%.

First, we surveyed 4,700 men and women aged 20–59 nationwide regarding their affinity for and attachment to the 'water' in their residential areas. The results showed that 51.9% of people nationwide feel an affinity or attachment to the water in their current area, meaning about 1 in 2 people. By prefecture, Kumamoto ranked 1st (87.0%), Toyama 2nd (79.0%), and Nagano 3rd (75.0%)...