Decentralized water systems fail after installation from maintenance, spare-parts and ownership gaps

The problem

Systems are built with high launch visibility, then collapse from clogged or broken parts, absent spare-part supply chains, disbanded water committees, and donor funding cycles that pay for new projects but not for maintenance.

Evidence

• The World Bank estimates ~58% of roughly 700,000 handpumps in sub-Saharan Africa are non-functional.
• Reviews across 47 countries find roughly one in four handpumps non-functional at any one time — ~175,000 dead water points in 2015.
• Over two decades, broken handpumps represent an estimated US$1.2–1.5 billion of stranded investment; 30–40% of rural water systems fail prematurely.
• User committees rarely accumulate funds (savings average ~2% of expected levels); donor programmes run on 1–2 year cycles that prioritise construction over upkeep.
• The PlayPump is the canonical example: a celebrated novelty pump collapsed because spare parts and repair support were centralised far away, repairs took months, and its self-funding model never materialised — a social and logistical failure, not a technical one.

The binding constraint for any proposed solution

"It produces clean water on day one" is necessary but not sufficient. The real question is: what does it cost — in money, parts, and skill — to keep it running for ten years, and who pays and who fixes it? A solution requiring imported membranes, chemical dosing, battery replacement, and a trained technician inherits this failure mode directly. Solutions that are genuinely maintenance-free, consumable-free, and repairable by a non-specialist are directly attacking it. Every solution under the parent issue should be evaluated against this test.