SA Water will replace 700 metres of pipes along two Murray Bridge streets over the next few weeks.
New mains water pipes, which are less susceptible to leaks or breaks, are to be installed along Verdun Road and Edwards Street.
Asset operations and delivery general manager Mark Gobbie said the PVC pipes were more flexible and resistant to earth movement than older pipes, which were made of cast iron or cement, and were intended to last for 100 years or more.
"This ensures the work being done will allow us to continue providing world-class water services to our customers well into the future," he said.
"While environmental factors like soil movement and weather make it difficult to stop leaks and breaks from occurring, we are committed to taking a proactive approach in limiting their frequency and any impact on our customers."
Contractors from Fleurieu Civil are expected to carry out most of the work between 7am and 5pm on weekdays over a six-week period.
"For the safety of our people and commuters in the area, we ask residents and users of Verdun Road and Edwards Street to please take note of the localised traffic management in place while the works are being completed," Mr Gobbie said.
"We will ensure local residents are notified of any temporary water supply interruptions that are necessary when we move their connections over from the old to the new pipes."
SA Water plans to replace 375 kilometres of pipe across South Australia between 2016 and 2020, at a cost of $137 million.