Jane Dodds is pressing the Welsh Government to help ensure that enough public toilets are available in Powys.
The Mid and West Wales MS asked at the Senedd about funding for public toilets operated by town and community councils.
She said Powys is a large rural area which welcomes visitors.
But Ms Dodds said there are people, especially elderly people, who are apprehensive about travelling because of concern over the availability of toilets.
She said the Older People’s Commissioner for Wales had found that almost two-thirds of people aged over 60 struggle to find toilets.
Ms Dodds said: “I would welcome a statement clarifying the Welsh Government's position on funding for community toilets.
“I've got an issue in Powys, where Rhayader Town Council operates three toilets on the A470 and have real funding challenges.”
Business Minister, Lesley Griffiths, said local authorities are required legally to produce local toilet strategies.
She said that in doing so, they should talk to people to see what they need and consider what potential solutions can be found.
Ms Griffiths said guidance has been issued to local authorities to highlight that availability of accessible toilets is particularly important to people with health conditions.