Been in a six-story prewar on the UES for a few years, moved up to the top floor last month. There's a roof tank right above my bedroom. Every morning around 5:00-5:15 the fill valve or pump kicks on and it’s not a hum—it's a metal clank/knock through the wall for like 15 minutes. I can sleep through traffic and the M15, not this.

Super says it's 'normal fill cycle' and building has no money to swap the valve. I’m rent-stabilized, lease is quiet enjoyment, but I don't want to become the tenant who opens a 311 case on my own building without knowing if it'll actually do anything. Anyone gone through this? Do I ask for a ball valve replacement, pressure regulator check, or just buy better earplugs?

Whoa, I thought those tanks just filled silently at night? We just moved to Yorkville and I hear something gurgle around 6 but not banging. Is the clank an air hammer thing? Sorry if that's dumb. Would the super have to shut off the water to fix it? Also, would a 311 noise complaint even apply if it's the building's own mechanical? Following because I might be in this situation soon.

It’s not dumb—air hammer/water hammer is actually the first thing I’d suspect, not a 311 case. In older prewars, the roof tank fill line usually has a float or solenoid valve that slams shut when the tank reaches level. If the riser isn’t strapped or the water hammer arrestor is shot, that clank travels down the pipe chase and into the top-floor unit. The super saying 'normal' is true in the sense that many old buildings tolerate it, but it’s not unfixable.

You can ask for a plumber to check the tank’s fill valve, shutoff timing, and whether there’s a water hammer arrestor or air chamber on the roof line. Usually it’s a few hundred dollars in parts and labor. Since you’re rent-stabilized, you have a stronger maintenance complaint than market tenants, but the burden is proving it’s a repair issue, not a 'building character' issue.

I’d first send a written repair request to the managing agent with the exact times and duration. Keep a two-week log: date, start/end time, description of the sound. Then if it’s ignored, file a 311 noise complaint for 'boiler/mechanical noise'—try to use the exact nearest category. 311 won’t guarantee a fix, but an inspector visit can prompt the owner to actually change the valve. Also ask if they can adjust the fill timer to later, like 7 a.m., which costs nothing and solves the sleep issue for a lot of people.

Not me googling 'water hammer arrestor' after reading that. We’re first-time renters in Astoria and our old radiator clanks too but we kind of got used to it. Does the rooftop tank affect shower pressure? Ours drops hard at 7am when everyone flushes. Could asking the super to adjust the fill timer actually make pressure worse for morning showers? I’d be scared to complain then everyone hates me.

@block_assoc_bee good flag on water hammer. I didn't want to open a complaint blind. I'll start the log tonight. Timer move to 7 would solve 80% of it honestly—I'm already up by then. Pressure is fine in my unit when it's clanking, so I don't think it's tied to draw.

@firstbodega your Astoria pressure drop is probably building-wide demand, not the tank timer. Different beast.

Update: I realized our building has a roof tank too and I’ve been hearing a soft hiss, not a bang. Is that normal? Also if I email the super about my hiss, should I record it on my phone first? I don't want them to come up and it's quiet. @queens_corner do you have an old steam riser next to the bedroom too, or just the tank pipe? Wondering if the clank is the riser expanding.

@DykerNewbie the soft hiss is usually just the tank overflow or a pressure relief doing its job, but not always. If it lasts more than fifteen minutes or happens during the day, it’s worth sending a recording. In my last building, a hiss turned out to be a pinhole leak at the roof bulkhead that nobody caught until a ceiling stain appeared on the sixth floor. Not trying to scare anyone, but a ten-second video with a timestamp helps.

@queens_corner the change request should be in writing and ask for two things: (1) an inspection of the fill valve and any arrestor, and (2) a timer adjustment if the valve isn’t defective. That way you’re not asking for a luxury fix, you’re asking them to choose the zero-cost option first. I’ve seen supers adjust timers by fifteen degrees on a dial and the problem disappears.

If they won’t, a 311 complaint after you’ve documented two weeks is reasonable. Just know that HPD noise complaints work better for recurring mechanical noise than for a single clank. Describe the pattern—'daily at 5:05 a.m. for 10-15 minutes, metal hammering in walls'—and mention you already notified management. The inspector may not be able to witness it, so the log plus a recording with a timecode is the evidence. In one building, an HPD inspection report plus a lease 'quiet enjoyment' letter from a tenant group got the management company to move the timer to 6:30 within a month. Not guaranteed, but more likely than if you just call the super again.

Okay so the timer thing is free?? That seems too easy. Our super charges for everything unless it’s in the lease, but maybe I can ask about our shower pressure drop with the same 'free adjustment' trick. @DykerNewbie I record everything now—my phone mic picks up the radiator clanks really well. @queens_corner if they move the timer to 7 do you think you'd hear it more because the building is awake? Just wondering.

@firstbodega free only if the super actually wants to do it, lol. Mine is old-school but not a monster. I emailed the management office this morning with the exact wording block_assoc_bee gave. Already got a reply: 'roof tank will be inspected.' Could be a brush-off. We'll see.

@DykerNewbie I have the tank pipe in the wall and an old riser about three feet away. It's possible the clank is one pipe hitting the other. The tank overfill hiss is different; mine is a hard knock.

Thanks! I sent a recording of our hiss to the super and he said it's the toilet fill on the floor above, not the tank. Cue embarrassment. But he did say our tank timer is already at 6:30 and not to touch it. @block_assoc_bee do you think a pinhole leak would hiss exactly when someone flushes? That's what I can't figure out.

@DykerNewbie wait so you complained about a toilet refill? lol that's kind of adorable. Our upstairs neighbor's shower sounds like someone's spraying a hose into our wall, but we only hear it when they're in there. I'm learning that in old buildings you can't tell what's normal until someone else confirms it.

@queens_corner did the inspection happen yet? I need closure.

@firstbodega you hit the real issue: a lot of old-building noise isn't the system, it's that the building's pipe chases were never isolated. A toilet refill on one floor can sound like a tank valve above if the copper is touching a stud or a riser clamp is loose. That said, a pinhole leak would be constant, not flush-timed. @DykerNewbie the super is probably right in your case.

For the OP, if the inspection happens and the valve looks 'fine' to them, ask for the plumber's report or at least a written summary. Sometimes the issue is water pressure spiking at night when street pressure rises and the fill valve chatters against a worn seat. A pressure-reducing valve on the domestic line is another relatively cheap fix.

If you're not getting that, the next step is a letter from a housing attorney or tenant clinic. Many rent-stabilized tenants are afraid to push because they think they'll get non-renewed, but repair requests are protected from retaliation. I would still keep the tone cooperative. Maybe offer to pay for the timer adjustment yourself—some supers will do it under the table for a tip, but make sure you don't touch a city riser without permission. In the meantime, try a mechanical white-noise machine plus felt pads behind the headboard. It won't stop the clank, but it takes the edge off the startle response, which is usually what ruins sleep.