Low Water Pressure

Frequently Asked Questions

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What could be the cause of low water pressure in my home?

First, you most likely have a low flow problem, rather than a low pressure problem. In many cases, low flow can be remedied through simple plumbing maintenance.

Clogged Plumbing Fixtures and Appliances – faucet aerators, hose bibs, water heaters, dishwashers, etc. These can clog with sediment, rust, and calcium build-up.
Water Filters and Softeners – dirty filters and components will greatly reduce water flow. Consult your owner’s manuals for recommended maintenance intervals.
Lawn Sprinklers – check for blockages, faulty valves and solenoids.

Other causes are best investigated by a qualified plumber, or confident do-it-yourselfer.

Restricted Plumbing – internal pipe corrosion, small pipe size, long pipe runs, or multiple bends in the system.
Water Pressure Regulator (or PRV) – these devices reduce the pressure from the public watermain to your home, and are typically located near your home’s main shut-off valve. If they are malfunctioning, they can affect water flow, and more importantly, damage your plumbing. Manufacturers recommend replacement every 5-10 years.

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How does internal pipe corrosion cause low flow?

When water flows through plumbing pipes and fixtures, it encounters friction, which slows its flow. The smooth internal surfaces of new pipes and fixtures produce little friction, but as these age, their internal walls corrode and accumulate deposits: this increases friction and lowers flow. This is often accentuated at bends, and where pipes connect to fixtures.

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How does a pipe restriction cause low flow?

A pipe restriction reduces the open area that water can pass through. When the same amount of water passes through a smaller opening, it must move faster, and this results in more friction and lower flow.

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Where does the homeowner’s responsibility begin?

The customer is responsible for a home’s plumbing downstream of the water meter. Any cost of repairs or water loss downstream of the meter is the responsibility of the customer. The utility is responsible for the water system upstream of and including the water meter.

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Does the utility’s system pressure fluctuate?

Yes, a water system’s pressure varies throughout the day depending on customer demand and the utility’s infrastructure. However, these pressure fluctuations are relatively minor and imperceptible, and rarely contribute to low flow in an individual customer’s plumbing.

Disclaimer: Suggestions of potential problems or solutions regarding customer plumbing are provided by and its agents as a courtesy. is not responsible or liable for costs and service interruptions resulting from customers investigating, repairing, or replacing plumbing downstream of the water meter.