Why Is My Water Pressure Low?

One fixture vs whole house

Start by comparing the kitchen sprayer, a second bath, and an outdoor hose bibb on the same morning. If only the master sink is weak, the problem is local. If every fixture dribbles, the restriction lives at the meter, PRV, or supply main.

NW Houston homes built in the 1970s and 1980s along FM 1960 and Cypress Creek corridors often show whole-house slowdowns when galvanized mains finally narrow. Room-by-room testing saves you from replacing aerators on a systemic issue.

Aerator and stop-valve checks

Unscrew the aerator on the weak faucet and look for grit after a recent shutoff or water-heater change. Partially closed angle stops under vanities—especially in guest baths that rarely get used—are another quick win before opening walls.

Tony's Plumbing checks stops and aerators during pressure calls so you are not quoted a repipe when a fifteen-minute cleanout restores flow. Hard-water scale in Cypress is common enough that aerators clog faster than owners notice.

PRV, galvanized, and leak clues

A failing pressure-reducing valve can strangle the whole house while the street pressure still looks fine at the meter. Galvanized pipes scale shut from the inside; hot lines often fail first because heat accelerates corrosion.

Hidden leaks sometimes show as low pressure plus a spinning meter when everything is off. Warm spots on slab floors in Houston ranch plans can pair with pressure loss—worth mentioning when you call so we bring the right detection tools.

When repiping enters the conversation

If hot and cold are weak everywhere, rust appears at fittings, and pinhole repairs keep multiplying, patching individual joints stops making sense. Whole-home repiping restores volume and water quality in one permitted project instead of chasing emergencies.

Tony's Plumbing maps accessible routes through attics and walls common in Cypress and Champions-area layouts. Call (832) 890-8449 for a pressure diagnostic before you assume the city main is the culprit.

FAQ

Why is only one shower weak in my Houston home?

Remove and clean the aerator or showerhead first; if pressure stays low with the head off, the valve or stop may need service. Whole-house weakness is a different diagnostic path.

Could a PRV cause low pressure at one shower only?

If every fixture is weak, Tony's Plumbing tests the PRV, meter, and supply lines for constriction or hidden leaks. One weak shower rarely traces back to the main PRV alone.

Should I assume a slab leak if one shower has low pressure?

Isolated shower weakness is usually fixture-side. We rule out local causes before recommending slab leak detection across Cypress and Houston homes.