Sanitation pays back about five and a half dollars for every one spent
Toilets rarely make headlines, yet billions of people still lack a safe way to deal with human waste. The quiet chain that carries excreta away from homes, treats it and keeps it out of water, soil and food ranks among the best returns on money a society can make, and it protects dignity as well as health.
Public-health specialists sum up how faecal disease spreads with a mnemonic called the F-diagram: feces, fingers, flies, fields, fluids and food. A working sanitation system puts barriers across those routes so the cycle breaks. That is why the word covers far more than a latrine. Depending on who is defining it, sanitation can include wastewater treatment, rubbish collection, stormwater drainage and hygiene promotion, and the United Nations General Assembly recognised access to water and sanitation as a human right in 2010.
Progress is tracked on a ladder. The Joint Monitoring Programme set out its rungs in 2016, climbing from open defecation through unimproved, limited and basic service up to safely managed. The difference between limited and basic is simply whether the improved toilet is shared with other households. The programme estimated in 2017 that 4.5 billion people lacked safely managed sanitation, and as of 2015 some 2.4 billion still had no improved facilities at all.
The economics are stark. A rough global estimate puts the return at US$5.50 for each dollar invested. A World Bank study found poor sanitation cost India the equivalent of 6.4 percent of its GDP through early deaths, lost time, lower productivity, medical bills and forgone tourism, with the heaviest burden falling on the poor, women and children. Having a toilet at home is linked to higher literacy and more women in paid work.
Not every solution needs sewers. Pit latrines and septic tanks, known as non-sewered systems, handle roughly half of all provision worldwide. They carry a hidden cost: in 2020 their methane output was estimated at 377 million tonnes of carbon dioxide equivalent a year, about 4.7 percent of human-caused methane.
Source: Sanitation
