Most people will not be "significantly affected" by Sydney Water's move to reduce water pressure in the Illawarra.
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"Reducing the water pressure does not mean you'll have less water," a notice sent to affected residents says.
"You may need to turn on the tap more, and it could take a little longer to fill a bath or washing machine," the statement said.
It did say some instantaneous hot water systems, pressure reducing valves or corroded galvanised pipes would not work as effectively but Sydney Water spokeswoman Emma Whale said there was no need to worry about the change causing any damage.
"As Sydney Water is reducing water pressure, not increasing it, appliances won't be damaged," Ms Whale said.
"Reducing water pressure means people won't have to install their own pressure-reducing valves on hot water systems or water meters to protect their appliances. It also means less leaks and breaks."
Ms Whale said only those residents living in affected homes across the Illawarra have been receiving the notice, which explains water pressure is a measure of the force required to move water from Sydney Water mains into the pipes of a house.
"If you have a swimming pool that is 10 metres deep, 10m 'head' is the pressure at the bottom of the pool," it states.
The notice advised most homes in the Sydney Water operating area had a water pressure of between 15m and 65m, while some customers may experience pressure of over 100m.
Sydney Water is reducing the pressure across its area, while ensuring that it does not fall below the 15m mandated by its operating licence condition.
"High water pressure contributes to burst water mains, leaks and water waste," the notice says.
"Through this program we can reduce leaks, improve the reliability or the water supply system and save water."
The program is due to be completed by July.
