India has some pretty severe water and wastewater problems. India already has four times the population of the US, is growing rapidly, and will be the most populous country in a couple of decades. As a developing country, infrastructure does not exist to deliver subsistence quantities of drinking water to everyone and to safely dispose of their waste.
Water supply: 11% of the population (almost half the population of the United States) lack access to any clean drinking water. The total basic water supply objective is 40 liters per person per day in rural areas and 140 in urban areas. In addition to the 11% of the population with no clean water, many poorer urban areas do not meet this target. For comparison, the average household in Carmichael where I live uses 3000 liters per day. Agriculture consumes most of the water supply and about 75% of the population farms. India needs the food: despite a rapidly growing economy 44% of children under 5 are malnourished, double the rate in sub-Saharan Africa. To support farming, electricity to pump groundwater is often subsidized or free. This subsidy is defended by farmers and politicians but leads to inefficiency and unsustainable overdraft of groundwater. Groundwater often has naturally high concentrations of fluoride, arsenic, or lead and is unhealthy to consume.
Sanitation: 70% of the population lack adequate sanitation. If I lengthen my morning beach walk beyond the boundaries of NITK the problem is readily apparent. The untouchable caste used to collect and dispose of waste. This practice has been curtailed but discrimination of the caste has not stopped. While socially problematic, some believe this was a more sanitary disposal system than now exists. Waste is now disposed by open defecation or sewer systems for which treatment plants are often nonexistent, poor, or not operated at night. More Indians have access to a mobile phone than a toilet. The polluted waters make delivery of potable water more difficult.
Indian water priorities are subsistence and survival. I participated in a Northern California climate change study that focused on what resource managers are concerned with: sea level, available water, snowmelt, and habitat indicators for fish. A similar Indian study focused on available water, agriculture, fisheries (as opposed to fish), forests, and human health (heat, flooding, malaria).
In California, the often-used line to convey the importance of water diversions from the Sacramento – San Joaquin River Delta is ‘provides drinking water for 25 million people’. That does not resonate here. An Indian colleague emphasizes that the concern here is to supply food and minimal subsistence levels of safe drinking water to its population, which we in the United States are fortunate to be able to take for granted.