Running out of water
Seven utilities run the same recognised playbook — meters, telemetry, district zones. This route orders them by how hard the instrument bites when the water actually runs short: from finding lost water to deciding, household by household, who gets it.
7 stops · 7 cities · 5 countries · 1993–2024 · 4 graded independent or peer-reviewed · 1 failed or scaled back
Every stop here uses the standard toolkit of a modern water utility. What changes along the route is the relationship between the meter and the customer: first the meter finds water the utility is losing, then it polices what the utility says about itself, then it schedules scarcity — and finally it becomes the instrument that grants or stops supply at the front door. The last two stops are the same technology with opposite verdicts.
Read in order: every stop goes a step further than the last.
✔ Every published entry is checked against the public sources it cites before publication.
- 1 📡 PPWSA: Metering Out a 72% Water Loss The proof it can be done, three decades old: losses fell from 72% to 6% — on meters and enforced bills, not on a control room, which arrived years later.
- 2 📡 ISKI Centralized SCADA Water Balancing Strategy The modern playbook at its steadiest: district metering and night-flow telemetry, with non-revenue water pushed from 22.3% to 18.6% on the operator's own reporting.
- 3 📡 Johannesburg Water: Pressure Control and Night-Flow Telemetry Against 46% Losses Instrumentation can be real and still be losing: the same toolkit as Istanbul, non-revenue water at 46.2 percent — and an Auditor-General grading what the utility says about itself.
- 4 🌱 Bogotá's 2024–25 Rotating Water Rationing Scarcity by schedule: supply cut to rotating zones with the plan published — a number every day, but the decision stayed discretionary.
- 5 🌱 Day Zero: Cape Town's Drought Demand Management The household meter becomes the binding instrument, not the reservoir: the famous countdown was a forecast, and what actually bit was demand control at the tap.
- 6 📡 Prepaid Smart Water Metering (Agua Prepago) Prepayment as an offer: pay-as-you-go water for households that billing had excluded — with the criticism recorded in the same entry that service stops the moment the balance does.
- 7 📡 CityTaps Prepaid Smart Water Meters Prepayment as a peer-reviewed failure: taps stayed dry for households with topped-up meters, the lease was not renewed, and the vendor went into liquidation.
What this route shows
The technology holds steady along this route while the stakes rise. A district meter that finds leaks is a service; a published rationing schedule is a promise; a prepaid meter is a decision about who gets water, made in advance and enforced automatically. Phnom Penh shows the playbook working outright — and Niamey shows its hardest edge failing under peer review: taps stayed dry for households that had credit, because prepayment fixed billing for a utility that could not fix supply.