You know, it'd work without the NYC. It could say something more generic, like city sewer, or go more specific to your idea and have it say "Kharma Sewer". I'd $5 a "Kharma Sewer."
It's a 4. Without such a strong concept, it'd be stale.
Plus, I'm of the mind that NYC thinks entirely too much of itself. I don't 'heart' NY. I wanna see a pictograph shirt that says "NYC smells of urine." Crap in a sewer isn't special designer crap. It won't smell any better or make you cooler/more relevant. There'll just be more of it, like self-important New Yorkers.
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