Water pressure is fine everywhere but the main floor bathroom.

Both the toilet and the sink have very low pressure.

And yes I checked and the kiddos did not partially close the valves.

Not to be too obvious but it sounds like you have some sort of blockage.

How old is the house?
Do you have a well?
As far as the faucet is concerned there is usually a screen/aerator on the end. You can unscrew it with your hands and blow out (or rinse out) any contaminants in there.

What type of plumbing do you have? Pex? If Pex is there a manifold with valves and one might be partially shut? Copper? Age of home? Is the pressure low on both hot and cold water?

Could be a split supply hose that's leaking under your slab, causing low pressure and flow to that bathroom. Could be the slab shifted and crimped the supply hose partially shut. Could there be ice in the line? Did you take the faucet screen off and see if it isn't simply blocked with debris?

In addition to the above, I'd start with the obvious and verify there wasn't some debris that stopped up both lines. Had some water work done in our neighborhood a couple years ago and somehow got dirt water for a minute and enough gunk that one toilet slowed down.

Taking apart the internal valve and then supply line still slow. Ended up having to remove the shutoff valve, shook out the pebble that was jammed up against it and was back in business.

Hot and cold supply?

First check the faucet aerator. This could be plugged with sediment/mineral deposits.
Same deposits could be in the ballcock on the toilet and depending on the style those can be cleaned out as well. Pix would help.
You can always disconnect the supply line going to toilet and see if you have good pressure by putting line in a bucket and turning back on. If you have good pressure there, the ballcock may have junk in it

Probably low flow, not low pressure.

There are not usually "riser valves" isolating a single 1st floor bathroom, but that's where I'd start.

We had an old water heater that was near its end. I guess there was a thermostat or something inside that had a fiber sort of sleeve on it. It broke up over time, creating slowdowns with small pieces collecting at the valve of a fixture.

16 year old house
4 year old water heater
Copper pipes

quote:

Originally posted by Black92LX:
16 year old house
4 year old water heater
Copper pipes

Is there a shower in your main floor bathroom? How's that flowing?

I had an old house with this problem. Turns out the electric was grounded to the iron pipes supplying water, and the slight charge in the lines caused minerals in the water to "electroplate" the inside of the pipes. When I pulled an 1 1/2 inch pipe supplying that bathroom, you couldn't see daylight, looking down the end. I do hope your problem is easier, and cheaper, to resolve.

Is your house on a slab or basement? Is the bathroom in question on the first or second floor? A buddy of mine owns apartments, all single story ranch on a slab. He found out all 12 bathrooms needs the plumbing replaced due to pin holes in the water supply lines coming up out of the slab. The pipes were rubbing on the concrete just due to expansion/contraction. Granted they are 1970's construction, but if they were done right, should not be leaking.

Have you noticed any water leaks? Obvious question I know.

If you have access to a thermal camera I'd run the water full bore and see if anything shows up.

Another thought, try replacing one of the faucets. With the newer ones, if the mixing valve begins to fail it can dramatically cut your water flow. This happened to use a few years ago in an upstairs shower. We replaced it and end of problem.

Has a basement.
Dishwasher and kitchen sink on the same level no issues there. I issues in the basement or upstairs.
No signs of leaking anywhere.

I would check the sink faucet aerator. They can clog easy. Toilet can also clog but sometimes will clog with a slow continuous flow into the tank.

Any recent plumbing work down done upstream of this bathroom?

https://www.youtube.com/watch?v=3Li6fof2uVc
[lugged aireator

quote:

Originally posted by bendable:
https://www.youtube.com/watch?v=3Li6fof2uVc
[lugged aireator

Perfect timing.
I went to take off the Aerator and sure enough a Delta with a hidden one like that. Was not sure if it was a snap or twist in.
Guess i’ll See if I can twist it out with a pick.

Well that thing is all sorts of calcified to the faucet (likely have found the pressure issue).
Can’t get it to budge. It’s Christmas Eve and don’t feel like rolling with it today.
I’ll pick up some CLR and soak it to see if I can get it out.

I was thinking the aerator too, but are you certain the toilet is having an issue? I suppose minerals could be causing problems for both but that’s certainly a strange coincidence if so.

quote:

Originally posted by Oz_Shadow:
I was thinking the aerator too, but are you certain the toilet is having an issue? I suppose minerals could be causing problems for both but that’s certainly a strange coincidence if so.

Yup. The toilet sputters and take a long while to fill.

quote:

Originally posted by Black92LX:

quote:

Originally posted by Oz_Shadow:
I was thinking the aerator too, but are you certain the toilet is having an issue? I suppose minerals could be causing problems for both but that’s certainly a strange coincidence if so.

Yup. The toilet sputters and take a long while to fill.

Could be calcium buildup on the commode shutoff valve or the fill mechanism itself.