Utilities (fuel & water) · code 3810
Water bill
水道料
Key facts
As of August 2026, water bill prices in Japan are down 2.7% year on year and down 3.3% over five years. The official consumer price index stands at 100.6 (2020 = 100), up 418.6% versus January 1970, when the series begins.
Water bill sits in the utilities (fuel & water) group of Japan's CPI basket, with 680 monthly observations from January 1970 to August 2026. The series peaked at 107.9 in May 2025 and bottomed at 19.4 in January 1970; the latest reading is -6.8% against that peak. Against ten years ago it is +1.9%.
Latest CPI
100.6
2026-08 (2020=100)
YoY %
-2.7%
5y change %
-3.3%
Change since 1970-01
+418.6%
Annual average index by year
| Year | Index | YoY % | Months |
|---|---|---|---|
| 2015 | 98.2 | +1.1% | 12 |
| 2016 | 98.7 | +0.5% | 12 |
| 2017 | 99.1 | +0.4% | 12 |
| 2018 | 99.4 | +0.3% | 12 |
| 2019 | 99.9 | +0.5% | 12 |
| 2020 | 100.0 | +0.1% | 12 |
| 2021 | 103.6 | +3.6% | 12 |
| 2022 | 102.7 | -0.9% | 12 |
| 2023 | 103.7 | +1.0% | 12 |
| 2024 | 105.9 | +2.1% | 12 |
| 2025 | 106.1 | +0.2% | 12 |
| 2026 | 103.7 | -2.3% | 8 |
Average of the monthly index values in each year (2020 = 100). Blank months are excluded.
Frequently asked questions
- How much have water bill prices changed in Japan over the past year?
- As of August 2026, -2.7% year on year, measured by Japan's official consumer price index (2020 = 100).
- How much have water bill prices changed in Japan over the past five years?
- -3.3% compared with the same month five years earlier. The index now reads 100.6.
- When were water bill prices in Japan at their highest?
- The series peaked at 107.9 in May 2025. The latest reading is -6.8% against that peak.
- What is the difference between the index and the yen price?
- This page carries two kinds of number. The index (2020 = 100) measures percentage change over time and is not a yen amount; the yen figure is an actual average retail price from the government's retail price survey. Source: 総務省統計局 消費者物価指数 (e-Stat table 0003427113, nationwide, monthly).