Low Water Pressure in Metro Atlanta: A Checklist From Tap to Street

How widespread is the problem?

The pattern of the weakness is the best clue you have, so take two minutes to map it before you call anyone. Run the kitchen tap, a bathroom sink, a shower and the outdoor spigot nearest the street, using both hot and cold. Then answer three questions:

• Is it one fixture, one side (hot or cold), or every outlet in the house?
• Did it start suddenly, or has it been getting worse for months or years?
• Is the spigot outside as weak as the faucets inside?

That last test matters more than most people expect. Gwinnett County Water Resources tells customers that if pressure is good at the front spigot but poor indoors, the trouble is likely the home's pressure reducing valve. If the spigot is weak too, it suggests looking at the meter.

One faucet or showerhead is weak

A single slow outlet is almost always a fixture problem, not a pipe problem. Unscrew the aerator at the tip of the spout or take off the showerhead and look for grit and scale. Rinse it, soak it in white vinegar for an hour if it is crusted, and reinstall it. Debris often shows up after the utility has done work on a nearby main, because the change in flow knocks sediment loose.

If the stream is still thin with the aerator off, the cartridge or valve body inside the fixture is the restriction. That is a modest job for anyone who handles faucet repair in Atlanta. A tub or shower that stays weak with a clean head usually points to the valve in the wall, and shower valve work is the fix.

Only the hot water is weak

When cold is fine everywhere but hot is weak everywhere, look at the water heater. A partly closed valve on the inlet, a corroded nipple or a tank full of sediment can choke hot flow on its own. A plumber doing a water heater service call can usually tell which in one visit.

Every tap in the house is weak

Now the cause is somewhere between the meter and your fixtures, or at the meter itself. Check these in order.

1. The main shutoff

Make sure the valve where the line enters the house is fully open. After any plumbing work or a winter shutoff, it is common to find it only partly turned back on.

2. The pressure reducing valve

Many metro homes have a bell-shaped pressure reducing valve, or PRV, near where the supply line comes in. The Department of Energy's Building America guidance notes that most plumbing codes call for a PRV where supply pressure is above 80 psi, because higher pressure can burst pipes and damage fixtures, and it recommends static pressure in the house of 60 psi or less. A PRV that is wearing out can drift low and starve the whole house. Gwinnett says the PRV is the most common reason for low pressure in homes it serves, that the valve belongs to the homeowner, and that the county does not send crews to adjust or repair it. A plumber can put a gauge on a hose bib, read the pressure, and adjust or replace the valve.

3. A leak

Turn off every faucet and appliance and watch the meter. If the dial still moves, water is going somewhere. A soggy strip of lawn between the meter and the house points to the buried line, while a hissing sound or a warm spot on a slab floor points inside. Smyrna's utility office gives the same short list when there is no city work nearby: a leak or a clogged regulator in the house. Finding a hidden leak is specialist work, and our page on clues that a leak is under the slab covers what to look for indoors.

Who owns the pipe that is causing it?

Across the region, the split is drawn at the meter. The utility owns the main and the line up to the meter; the owner is responsible from the meter to the house and everything inside it. Here is how the larger systems describe it, along with where to report a problem on their side:

So if the meter box is dry and the spigot is weak, a crushed or leaking service line on your side is a strong suspect. Old lines also get nicked during landscaping, fence or irrigation work.Fixing that section falls to the owner and is a job for service line repair. If the meter is not turning at all with a tap open, call the utility first.

Pressure that faded slowly over the years

A gradual decline, often with rusty water first thing in the morning, usually means the pipe itself is closing up. Saint Paul Regional Water Services gives a clear explanation that applies anywhere: galvanized steel loses its zinc coating over time, then rusts inside, which narrows the pipe, cuts flow and can leave pressure uneven from room to room. It suggests that galvanized pipe showing these signs is likely near the end of its life and that copper or PEX is worth considering.

Older houses are where this shows up. About 42.7% of homes in the city of Atlanta were built before 1980, according to Census survey data, and in nearby Hapeville the share is about 63%. Intown bungalows and postwar ranches are prime suspects. You cannot clean corrosion out of a supply pipe, so the answer is replacement: a short run if the damage is local, or a full repipe if the whole house is affected. If you are also replacing the buried line from the meter, do both at once.

When the whole street is weak

If neighbors report the same thing, the cause is on the public side: a main break, a valve being exercised, a hydrant being flushed or heavy demand. No plumber can fix that. Report it to the utility using the numbers above, and once service returns, clean your aerators, since sediment often follows a repair. Utilities sometimes issue boil water notices after a break; follow their instructions rather than any rule of thumb.

Homes on a private well

Most of the metro is on public water, but some homes, particularly in more rural pockets like parts of Milton, get water privately. On a well, pressure comes from the pump and a pressure tank, not a water tower. Guidance from the Washington State Department of Health, published by Water Technology, says the telltale sign of a tank that has lost its air charge is a pump that turns on and off too often. To check it, turn off power to the pump, drain the system through a faucet and read the air valve on top of the tank with a tire gauge. Add air if it reads more than 2 psi below the pump's cut-in pressure, and let some out if it is 2 psi above. If pressure falls off quickly after you restart, the bladder may be torn. For pump, switch or tank work, see well pump service.

Quick sorting table

If more than one row fits, a whole-home plumbing inspection can check pressure, pipe material and the PRV on one visit. For a rough idea of what repairs run, see the Atlanta plumbing cost guide.