I shut off main water line in my apartment but the water is still running, why?

Answer 1

Because what you turned off was not the main shut off?

Answer 2

the jumper valve in the tap is worn out and needs to be replaced . Doing that is not your responsibility

Answer 3

Two possible reasons:

1) The valve doesn't seal properly. This isn't uncommon with valves that don't get operated very often.

2) That was the wrong valve.

Answer 4

it's not common for individual apts to have a main water shutoff

Answer 5

The valve is not closed or the valve does not work?

Answer 6

maybe you turned off the wrong valve

Answer 7

If you still have full flow that last more than 1 or 2 seconds, you DID NOT shut off the main line.
It is possible the valve you think is the main shutoff actually isn't the main shutoff.
It is also possible that the valve isn't actually shutting off.

Answer 8

The valve leaks or the piping runs from your apartment to another to another and over the years someone tied theirs back into the main line. Hence, you have water being supplied by serval sources. If you have a meter, shut it off at the meter and see if it does stop. Your meter may have been jumped in years past.

Answer 9

It could be the shut off valve isn't functioning properly.

Answer 10

It's water still in the pipes, between the shut off valve and your taps let it run and it will stop in a short time, if it doesn't stop than you turned off someone elses supply and not your own, so you better turn it back on.