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Understanding the Problem

The problem is not water. It is dependency.

Jakarta receives about 2,000mm of rain every year. Yet many households still rely on groundwater for daily washing, cleaning, and sanitation. The issue is not a lack of rain; it is the way the city meets everyday water demand.

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By the Numbers

A crisis hiding in plain sight

0%

of Jakarta's 11 million residents lack piped water access

World Bank, 2024

0cm

per year — sinking rate in the worst areas of North Jakarta

MDPI Water Journal, 2024

0%

of affected households spend over 5% of income on water alone

The Conversation, 2023

0

the year North Jakarta could be permanently underwater

Jakarta Post, 2024

0×

more expensive — informal vendor water vs. piped tariff

The Conversation, 2023

0mm

annual rainfall in Jakarta — largely uncollected, flowing to waste

BMKG Indonesia, 2024

System Chain

How household water gaps become city-level risk.

01

No Piped Water Access

PAM Jaya, Jakarta's state utility, covers only ~70% of the city. The poorest kampung settlements are the last in line — and have been waiting for decades.

02

Groundwater Extraction

With no alternative, millions install private pumps and extract groundwater daily. It appears "free" — but the hidden cost is catastrophic. Pumping is nearly impossible to regulate at household scale.

03

Aquifer Collapse

Underground water tables drop. The soil above — no longer supported by water pressure — compacts and collapses. Jakarta's concrete surfaces block natural rainwater recharge, accelerating the problem.

04

Land Subsidence

The city sinks. North Jakarta has dropped 2.5 metres in the last decade. Some areas are now 60–100cm below sea level. Infrastructure cracks. Pipes break. Saltwater intrudes into remaining groundwater.

05

Worse Flooding

Sunken land cannot drain. Heavy rains — of which Jakarta receives plenty — turn into floods that damage homes, disrupt schools and livelihoods, and force displacement. The poorest communities lose the most.

06

Water Gets Scarcer

Contaminated, saltwater-intruded groundwater becomes less usable. Households turn to expensive vendors or continue pumping deeper. The cycle tightens unless daily demand is reduced.

Why Nothing Has Worked

Three systems. Three failures.

01

Government

PAM Jaya's network expansion has stalled for years. Infrastructure investment requires billions. Political incentives favour visible projects over essential maintenance. Enforcement of the 2026 groundwater ban remains minimal.

02

Free Market

Water vendors exploit monopoly positions in unserved kampungs, charging 10–32× the piped tariff. There is no profit incentive to serve poor communities fairly. The market maximises revenue — not access.

03

Charity

Donor-funded water projects exist — but a charity rupiah is spent once and gone. When funding ends, so does the project. Past rainwater harvesting initiatives in Jakarta failed due to community mistrust and no maintenance model.

Who Suffers Most

The people the system forgot.

In Jakarta's kampung settlements, a family of four can spend up to 30% of monthly income on water — bought litre by litre from informal vendors.

Women and girls often carry the burden of collecting water, queueing, negotiating vendor prices, and managing household use when supply is unreliable.

This is not a natural disaster. It is a systemic failure — of infrastructure, of governance, and of market access.

See how RainBank helps
Jakarta kampung water access

"When piped water does not reach the house, families still need water for washing, cleaning, and toilets every day."

— RainBank field assumption for pilot planning
What's Next

The next step is a practical pilot.

Rainwater harvesting is familiar technology. RainBank's contribution is the operating model: local ownership, basic treatment for non-potable use, transparent fees, and maintenance funded by hub revenue.

How It Works