An Albion Park Rail woman claims she can't swim in her backyard pool, because of dust kicked up by the bypass construction.
But a Transport for NSW regional director Sam Knight said there was a number of dust mitigation measures in place.
Karen Buckley lives at the southern end of the construction area and said she and her husband have to contend daily with dust blown into the pool - and the house.
"The pool is the colour of the dirt from the construction," Ms Buckley said.
"I know we're getting dust storms from out west with the fires and the drought. But this is dust from the dirt from the [bypass]."
She said her husband has been vacuuming it at least once a day and the pool filter stockings that used to last up to a fortnight are now being replaced daily.
"If he leaves it for a day or two, it's thick mud, like concrete on the bottom, so he's got to get in and stir it up," she said.
When they went away on holidays for a few weeks, they turned the filter off.
When the couple returned, they found the dust was so bad, the husband had to climb in and blast the dirt off with a high-pressure cleaner.
And this was with a pool cover over the top.
"If the cover's been left on for a day without vacuuming you can see the dust all on the top of the cover," she said.
"When you take the cover off you can see it in the pool. So it's even getting through a fine dustcover."
She has also claimed the dust is getting into her house, despite closing the windows and installing a more airtight door.
"Even with the airtight door and the windows closed, you could dust and five seconds later the dust's back there again," she said.
"I've got tiles in the house and you can hear the grit when you walk. I really feel for those who have carpet."
Ms Buckley suggested there was not enough water spraying of the dust on the bypass work site, adding that she couldn't remember seeing a water truck in the area.
She had not contacted Transport for NSW because she didn't believe it would change anything.
The department's Southern regional director Sam Knight said there was a range of dust mitigation measures for the Albion Park Rail bypass.
"Water carts are one of the most visible methods used to control dust but they are not the only mitigation measure," Ms Knight said.
"Other techniques currently used on the Albion Park Rail bypass project include minimising exposed surfaces, compacting the earth and road base using heavy equipment such as rollers, and managing stockpiles and loose materials."
Ms Knight said as much of the water as possible came from runoff from the which was collected in specially-constructed sediment basins.
"In extreme cases the Sydney Water supply is also used to reduce dust impacts but Transport for NSW avoids using potable water as much as possible, especially during drought-induced water restrictions," she said.