Water
What percentage of the Earth's surface is covered by water?
71%
Which household device typically uses the most water?
Toilet
What is the only South American country that doesn't border Brazil?
Chile
What is the name of the coffee shop in the TV show Friends?
Central Perk
Which UK regulator oversees the water and wastewater companies in England and Wales?
Ofwat
How many water and wastewater companies operate in England and Wales under Ofwat regulation?
11
What water treatment parameter measures the amount of oxygen required by microorganisms to break down organic matter over five days at 20°C?
BOD₅
Which continent has the most countries?
Africa
What is the name of the fictional continent where Game of Thrones primarily takes place?
Westeros
Which international organization sets guidelines for drinking water quality worldwide?
WHO
What is the term for the hidden water used to produce goods, such as the water footprint of a hamburger?
Virtual Water
What term refers to the solid by-product of wastewater treatment that is further processed before reuse or disposal?
Sludge (biosolids)
Which country has the most volcanoes?
Indonesia
In which country was the 2006 FIFA World Cup held?
Germany
What is the European regulation that sets standards for the treatment and discharge of urban wastewater?
UWWTD
What type of coagulants are most commonly used in drinking water treatment?
Alum/PACl
Which biological process uses microorganisms in oxygen-rich conditions to break down organic pollutants in aeration tanks?
Activated sludge
Which country spans the most time zones (including overseas territories)?
France
Which series, based on a video game, became HBO’s hit show in early 2023?
The Last of Us
Which filtration method uses a process to adsorb taste-and-odour compounds, micropollutants, and residual disinfectant by-products?
GAC
Which treatment process relies on the generation of highly reactive hydroxyl radicals?
Advanced oxidation process
Which European country is widely regarded for having the highest use of wastewater reuse per capita?
Spain
The Danube River flows through how many countries?
10 (Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova)
Which country officially became the 31st member of NATO in 2024?
Finland
What is the name of the global initiative encouraging businesses to measure and manage water use?
CDP Water Disclosure