How Humans Use Fresh Water: The Essential Resource

Direct Human Needs

• Drinking & Hydration: 2–3 L/day/person minimum.
• Sanitation & Hygiene: Toilets, handwashing, bathing – 20–50 L/day (WHO basic).
• Cooking: Boiling, steaming, cleaning food.

Agriculture (70% of Global Withdrawals)

• Irrigation: flood, sprinkler, drip (increasing efficiency).
• Livestock watering & feed crops.
• Aquaculture.

Industry (19%)

• Cooling (thermal power, manufacturing).
• Process water (chemicals, textiles, food processing, semiconductors).
• Mining & hydraulic fracturing.

Energy (Overlaps with Industry)

• Hydroelectric generation (reservoirs, run-of-river).
• Thermal plant cooling.
• Biofuel crop irrigation.

Ecosystem & Cultural Services

• Environmental flows for fisheries, wetlands, deltas.
• Recreation (swim, boat, fish).
• Spiritual / cultural significance (Ganges, Jordan, etc.).

Conservation Imperative

Only 2.5% of Earth's water is fresh; 0.3% accessible (lakes, rivers, shallow aquifers). Efficiency, reuse, pollution prevention, and equitable allocation are existential priorities.