Bengaluru: An apartment in North Bengaluru is facing a problem: its sewage treatment plant (STP) breaks down periodically, and residents have to put up with stinking toilets when the faulty STP sends untreated water into the apartment's dual plumbing system.

This happens in many apartments, especially those that lack the space, willpower and leadership to handle water treatment in-house. The Karnataka government has mandated that every project with more than 120 units must treat its own sewage. The number was 50 or more apartments at one point, and most smaller apartments struggled to handle it.

A member of the association of an apartment in North Bengaluru explains how this happens.

“When a project comes up, the builder goes and submits the documents to the pollution control board. The

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