Not rated — no significant reservoirs
Marshall Islands is set aside from the ranking rather than graded. Having no significant reservoir storage is a geographic fact, not a transparency failure — so assigning an “F” would be misleading.
H1 2026 Evaluation
Marshall Islands Reservoir Transparency
N/AWhy it's not rated
No hydrological reservoirs: coral atolls (max ~2 m elevation); the Majuro airport-catchment tanks are distribution storage, not impoundments.
Where its water comes from
Airport rainwater catchment, reverse-osmosis desalination and shallow groundwater lenses.
Reference source
Majuro Water and Sewer Company (MWSC) — Airport Catchment System
http://www.mecrmi.net/MWSC.htmEvaluator notes
The Marshall Islands is a structural zero for reservoir infrastructure: its coral atoll geography (maximum elevation 2 m) makes surface impoundment physically impossible. Water supply relies on the Majuro airport runway catchment feeding seven above-ground storage tanks, a freshwater lens at Laura village, household rainwater collection, and solar-powered reverse osmosis desalination. A PACC/UNDP climate adaptation programme (2019–2026) expanded airport storage capacity from 121 to 138 ML and reduced evaporation losses, extending drought endurance from 3–4 weeks to 3–4 months. None of this infrastructure generates publicly accessible operational data. MWSC does not publish fill levels online, and no national open-data initiative covers water storage. The RTI score of 10/100 (weighted) reflects this structural absence of both the physical asset and the data publication system, not a failure of governance per se.
Evaluated by Jaime Delgado · 2026-09-15 · Methodology v1.3.0