I’ve had good experience with 311 if you politely follow up — sometimes the notice says “3” or “10” days til the next update. You don’t always have to wait a month.

DM them on Twitter too. If the grate is actually the water department (NYC DEP) or Con Ed (not a city agency obviously) you can tweet/DM them on Twitter too.

Con Ed responds fast because they’re a private company and are liable if they ignore problems for too long.