What Causes Low Water Pressure From My McKinney Home's Faucets?

The aerator is the small mesh screen screwed onto the tip of your faucet spout. It mixes air into the water stream to create smooth, steady flow. Over time, mineral deposits collect on that screen and block the water from passing through freely.

McKinney's water supply accelerates this problem. The North Texas Municipal Water District sources water from Lavon Lake and four other reservoirs. As that water moves through the region's limestone geology, it picks up calcium and magnesium. The USGS classifies North Texas as a hard to very hard water region, meaning those minerals settle inside your aerator faster here than in softer-water cities.

Signs your aerator is clogged:

• Water sprays sideways instead of flowing straight
• Flow is uneven or dribbles weakly
• Only one sink has low pressure while the rest of the house is fine

You can clean a clogged aerator yourself. Unscrew it from the faucet tip, soak it in white vinegar for 30 minutes, scrub it with an old toothbrush, rinse it clean, and reinstall. In newer McKinney master-planned communities, we find aerators clogging within two to three years of a home being built — the mineral content in the local water supply is that consistent.

If cleaning the aerator doesn't restore your pressure, the problem is likely one step deeper inside the faucet.

The cartridge sits inside your faucet handle. It controls how water flows when you turn the handle on or off. Over time, mineral buildup, corrosion, and normal wear cause the cartridge to clog or fail — and your water pressure drops as a result.

Cartridge problems feel different from a clogged aerator. With a clogged aerator, pressure is weak at the spout. With a cartridge issue, pressure may be low for both hot and cold water, or the handle may feel stiff and hard to turn. Both hot and cold lines run through the same cartridge, so when it fails, both are affected.

Signs your cartridge may need attention:

• Low pressure on both hot and cold water at the same faucet
• Handle is stiff or difficult to turn
• Cleaning the aerator made no difference

Replacing a cartridge is more involved than cleaning an aerator. You need to turn off the supply valves under the sink and disassemble the faucet handle to access it. In McKinney homes built between the 1990s and early 2000s, original fixtures often haven't been updated — cartridge failures are common in faucets that age. Our licensed technicians carry replacement cartridges compatible with Moen, Delta, and Kohler faucets, so repairs happen in one visit.

Every sink in your home has a shut-off valve — usually two, one for hot and one for cold. They sit underneath the cabinet, where the supply lines connect to the wall or floor. If one of those valves is partially closed, water flow to that faucet drops.

This happens more often than most homeowners expect. After a plumbing repair, a valve sometimes gets left partially closed. A valve that hasn't been touched in years can also stiffen internally from corrosion, making it look open when it isn't fully open.

How to open your shut-off valve:

Check both the hot and cold valves under the sink. Make sure each one is fully open before moving on to other causes. This check takes under a minute and costs nothing.

If the valve looks open but the handle feels stuck or you notice corrosion around the fitting, don't force it. A damaged valve can leak or break if turned too hard. Our McKinney plumbers can replace a faulty shut-off valve quickly and make sure water flow is fully restored.

A pressure-reducing valve controls the water pressure coming from the city main into your home. It keeps your indoor pressure at a safe level — typically between 40 and 80 PSI. When the PRV starts to fail, pressure drops throughout the entire house, not just at one faucet.

McKinney's newer master-planned communities — including areas like Stonebridge Ranch and Craig Ranch — commonly have PRVs installed as standard. We find them failing earlier than expected in high-growth areas where water demand peaks sharply during morning hours. The valve works harder during those peak periods and wears faster over time.

Signs your PRV may be failing:

• Low pressure at every faucet and fixture in the house
• Pressure fluctuates randomly — strong one moment, weak the next
• Pressure drops noticeably when demand is high, like early mornings

Some PRVs can be adjusted by turning a screw on top of the valve. That adjustment needs to be precise. Too much pressure damages pipes and fixtures. Too little and you're back to weak flow throughout the house.

PRV work is always a licensed plumber job. Our McKinney team can test your current pressure with a gauge, determine whether adjustment or full replacement is needed, and complete the repair with upfront pricing before any work begins.

Low water pressure in a McKinney home always has a cause. Most of the time it starts small — a clogged aerator, a stiff valve — and gets worse when left alone. The six causes covered here account for the majority of low pressure calls we respond to across McKinney and North Collin County.

Some problems you can fix yourself in under an hour. Others — a failing PRV, a slab leak, a corroded shut-off valve — need a licensed plumber with the right diagnostic equipment. Catching those issues early saves you from a much larger repair later.

Baker Brothers Plumbing, Air & Electric has brought 80 years of North Texas plumbing expertise to McKinney. Our licensed technicians arrive with the tools and parts to diagnose and fix low water pressure problems — same-day or next-day service available. We give you upfront pricing before any work begins, and we don't guess at solutions.

Located at: 7300 State Highway 121, Suite 399, McKinney, TX 75070

Call (469) 398-3229 for same-day plumbing repair in McKinney.

Baker Brothers Plumbing, Air & Electric — McKinney Location Serving McKinney, Allen, Frisco, Plano (North), Prosper, Celina, Little Elm, The Colony, and Princeton