This is how we used to live in this country until about 150 years ago, albeit with a smaller pipulation density. It was only in the later half of the nineteenth century that we became affluent enough to build public waterworks and sewerage systems, and that came out of taxation.
As India becomes affluent itself, we should see improvements in public health. That is assuming the rich pay their share of taxes, which apparently at the moment they do not.
And we shouldn't think of the Indians as filthy and that we are superior. There are plenty of beaches in the UK that still fail health checks because they are full of raw sewerage.
From yesterdays Daily Mail...
// Beaches at some of Britain's best-loved resorts could be closed for bathing from next year because of high levels of sewage contamination.
Water quality at popular stretches of coast including Blackpool, Scarborough and Clacton has failed to meet minimum standards.
This summer offers the final chance for the offending beaches to meet minimum water standards before the EU rules require local councils to put up warning signs next year.
But as contamination is based on the average over four years, any beaches ruled unsafe could face a long wait before they are reopened. //
http://www.dailymail.co.uk/news/article-2582163/Beach-lovers-warned-Britains-best-loved-coastlines-including-Scarborough-Clacton-unfit-swim-high-sewage-levels.html
Though there is a difference between paddling in dirty water, and washing and cooking with it.