Society

Water Supply Management Status

Last updated 2026-05-03 · Source: digital.go.jp

How to read this dashboard

These records compare water utility infrastructure, costs, prices, seismic resilience, renewal, and financial health.

Who is counted: Water utilities, pipeline networks, operating costs, served population, and prefecture-level infrastructure indicators.
What the number means: Metrics include unit price, total cost, population served, pipelines past useful life, pipeline renewal rate, seismic compliance, revenue recovery, and financial-health bands.
How to read it: Direction varies. Lower aging pipeline share is better; higher renewal, seismic compliance, and revenue recovery are better. Prices and costs need context because cheap water can coexist with underinvestment.
Why it matters: Water systems face aging infrastructure, disaster risk, shrinking populations, and fiscal pressure. These metrics show whether utilities are financially and physically sustainable.

Source definitions follow the Digital Agency page.

Water Supply Management Status includes 91 source rows across 12 visuals. Key fields include Utilities healthy (>100%), Utilities caution (80–100%), and Utilities stressed (<80%). One current source row shows Utilities healthy (>100%) is 1,137 for 2014. The official source, source rows, and stable English citation remain available as the government dashboard changes.

Reviewed 2026-05-07 by Tetsu. Terms adjusted for English readers.

Trend: Utilities healthy (>100%), Utilities caution (80–100%), Utilities stressed (<80%)

The line chart shows direction over time; the table keeps the exact source rows. Source visual 1.

Fiscal year	Utilities healthy (>100%)	Utilities caution (80–100%)	Utilities stressed (<80%)
2014	1,137	130	9
2015	1,153	117	3
2016	1,159	101	3
2017	1,152	120	10
2018	1,125	132	12
2019	1,116	125	11
2020	1,096	148	7
2021	1,108	134	6
2022	1,066	169	8
2023	1,037	184	9

Trend: Avg. unit price

The line chart shows direction over time; the table keeps the exact source rows. Source visual 2.

Fiscal year	Avg. unit price
2014	172 ¥
2015	172 ¥
2016	172 ¥
2017	173 ¥
2018	174 ¥
2019	174 ¥
2020	166 ¥
2021	172 ¥
2022	170 ¥
2023	174 ¥

Trend: Pipelines renewed (FY)

The line chart shows direction over time; the table keeps the exact source rows. Source visual 3.

Fiscal year	Pipelines renewed (FY)
2015	0.85%
2016	0.76%
2017	0.69%
2018	0.70%
2019	0.68%
2020	0.69%
2021	0.66%
2022	0.67%
2023	0.62%

Trend: Revenue recovery rate (FY)

The line chart shows direction over time; the table keeps the exact source rows. Source visual 4.

Fiscal year	Revenue recovery rate (FY)
2014	89.8%
2015	90.0%
2016	90.2%
2017	89.9%
2018	89.9%
2019	89.8%
2020	89.8%
2021	90.1%
2022	89.8%
2023	89.4%

Trend: Total cost

The line chart shows direction over time; the table keeps the exact source rows. Source visual 5.

Fiscal year	Total cost
2014	164.2 ¥bn
2015	163.7 ¥bn
2016	163.3 ¥bn
2017	165.7 ¥bn
2018	167.1 ¥bn
2019	168.4 ¥bn
2020	166.4 ¥bn
2021	167.7 ¥bn
2022	174.7 ¥bn
2023	177.6 ¥bn

Snapshot: Loss-making count (latest yr.)

Bars show the numeric measures captured in this source visual. Measures with different units remain in the table. Source visual 6.

Loss-making count (latest yr.)	Loss-making share (latest yr.)
668L	0.54308943089430894D

Trend: Pipelines past useful life

The line chart shows direction over time; the table keeps the exact source rows. Source visual 7.

Fiscal year	Pipelines past useful life
2015	13.2%
2016	15.0%
2017	15.9%
2018	17.8%
2019	19.4%
2020	20.6%
2021	22.3%
2022	23.7%
2023	25.4%

Trend: Utility count

The line chart shows direction over time; the table keeps the exact source rows. Source visual 8.

Fiscal year	Utility count
2014	1,276
2015	1,273
2016	1,263
2017	1,282
2018	1,269
2019	1,252
2020	1,251
2021	1,248
2022	1,243
2023	1,230

Snapshot: Stressed count (latest yr.)

Bars show the numeric measures captured in this source visual. Measures with different units remain in the table. Source visual 9.

Stressed count (latest yr.)	Stressed share (latest yr.)
193L	0.1142448558036069D

Trend: Population served

The line chart shows direction over time; the table keeps the exact source rows. Source visual 10.

Fiscal year	Population served
2014	121,000,285
2015	121,163,677
2016	121,312,729
2017	122,174,089
2018	122,208,578
2019	122,136,798
2020	121,975,330
2021	121,528,531
2022	121,154,604
2023	120,695,574

Trend: Cost-marginal utilities, Profitable utilities, Loss-making utilities

The line chart shows direction over time; the table keeps the exact source rows. Source visual 11.

Fiscal year	Cost-marginal utilities	Profitable utilities	Loss-making utilities
2014	355	817	104
2015	335	849	89
2016	322	844	97
2017	327	819	136
2018	358	777	134
2019	369	751	132
2020	453	623	175
2021	375	730	143
2022	516	532	195
2023	495	562	173

Trend: Seismic-compliant pipes

The line chart shows direction over time; the table keeps the exact source rows. Source visual 12.

Fiscal year	Seismic-compliant pipes
2023	43.5%