Low Water Pressure in Your Milton Home: Common Causes and What to Do
You know the feeling. The shower that used to feel fine now barely rinses the shampoo out. The kitchen tap fills a pot in what feels like twice the time it used to. The toilet tank takes forever to refill after a flush.
Low water pressure is one of those problems people adapt to without realising they shouldn't have to. I've talked to homeowners who'd been living with weak pressure for a year before they finally called. I've also seen cases where a drop in pressure was the first sign of a much bigger issue. The cause matters - and it's not always the same thing.
Is It Just Your Home or the Whole Street?
Need a plumber in Milton? Call FDR Plumbing: 647-226-2649 - Free estimates.
Before you do anything else, check with a neighbour. If two or three houses on your street have low pressure on the same day, it's a municipal supply issue - likely a main break or pressure adjustment by the Region of Halton. Call Halton Region water services (905-825-6000) to report it and check for notices. There's nothing to fix on your end; you just wait.
If your neighbours are fine and your pressure is still weak, the problem is inside your home. That narrows it down considerably.
Common Causes of Low Water Pressure in Milton Homes
Partially closed main shutoff valve. This is surprisingly common after any plumbing work has been done on the house - a repair, a renovation, an appliance install. The plumber shuts off the main to do the work, and the valve doesn't get opened back all the way when they're done. Sometimes it's the homeowner who closed it and forgot. The main shutoff is usually in your basement near the front of the house. Make sure it's fully open - on a ball valve, the handle should be parallel to the pipe.
Pressure reducing valve (PRV) failure. Many homes in Halton Region have a PRV installed where the main supply enters the house. Its job is to step down the municipal supply pressure to a safer, more manageable level for your home's plumbing. These valves typically last 10-15 years, but they do fail - and when they fail, they usually fail toward restriction, cutting your pressure right down. If your home has one and it's more than 10 years old, it's worth checking.
Clogged aerators from mineral buildup. Halton Region has hard water. Over time, calcium and mineral deposits build up inside faucet aerators - the small screen fitting at the end of your tap. This is one of the most common causes of low pressure at a single fixture. It looks like a whole-home pressure problem when it's actually just a clogged aerator that takes two minutes to clean.
Galvanized steel pipes corroding from the inside. If your home was built before 1970, there's a reasonable chance it still has original galvanized steel supply pipes. These corrode from the inside over time, and that corrosion progressively narrows the effective diameter of the pipe. The result is steadily declining pressure throughout the home - a slow creep you might not notice year to year until it's quite bad. Once galvanized pipe gets to this stage, cleaning doesn't help; replacement is the right call.
A developing leak drawing pressure. If you have a slow leak somewhere in the system - inside a wall, under a slab, in the yard - it's bleeding pressure off your supply. Low pressure combined with an unexplained increase in your water bill is a meaningful combination worth investigating.
Low pressure on hot water only. If the cold water is fine but the hot is weak, the issue points to your water heater or its supply line. This could be sediment buildup, a partially closed isolation valve on the heater, or corrosion on an older unit. The water heater is your starting point.
Quick Checks You Can Do Yourself
Start here before calling anyone:
- Check the main shutoff valve - confirm it's fully open
- Unscrew and clean faucet aerators - turn them counterclockwise, rinse out the screen, reinstall. Free, takes two minutes per fixture
- Check whether it's hot and cold or just one - this tells you whether the issue is before or after the water heater
- Note if it's whole-home or just one fixture - a single fixture points to that fixture; whole-home pressure points to the supply side
If you work through these and can't find the cause, or if pressure keeps dropping over weeks, it's time for a professional look.
When to Call a Plumber
Cleaning an aerator is a DIY job. Diagnosing a PRV failure, assessing corroded galvanized pipe, or tracking down a hidden leak is not.
PRV replacement requires shutting off the main, removing the old valve, and installing a new one correctly set to the right pressure range. Do it wrong and you can create an overpressure situation that damages fixtures and appliances. Galvanized pipe assessment involves understanding how far the corrosion has spread and whether a targeted replacement or full repipe makes more sense. Leak detection on a hidden pipe takes proper equipment - pressure testing and sometimes camera inspection.
When I do a service call in Milton, pressure diagnostics are part of the visit. I'll check your PRV, test the supply pressure at the main, and work through the most likely causes so you get a real answer, not a guess.
If you're dealing with low pressure and the quick checks haven't solved it, call FDR Plumbing at 647-226-2649. Free estimates, honest diagnosis.
Need a plumber in Milton? Call FDR Plumbing: 647-226-2649 - Free estimates.
FDR Plumbing
Licensed Plumbing & Drain Services, Milton ON