Labour politicians have urged Denbighshire council to tackle the "appalling condition" of houses in multiple occupation (HMOs) in Rhyl.
In a joint statement, Chris Ruane MP, Anne Jones AM and county councillors said the 650 HMOs such as bedsits had a "negative impact" on the seaside town.
The politicians say they have devised an action plan to tackle the issue.
The council said it took a "tough stance" on anyone who operated low-standard accommodation.
There are several recognised definitions for an HMO, including a house or flat which is let to three or more tenants forming at least two households who share a kitchen, bathroom or toilet.
"The health and safety of tenants living in private rented accommodation is non-negotiable"The group want the council to adopt its plan, which includes proposals to increase the number of officers and enforcement officials dealing with HMOs.
Mr Ruane - who has also just been appointed by the Department for Work and Pensions to head up a review of employment in seaside towns - said: "Tackling HMOs should be a top priority for Denbighshire County Council .
"The standard of accommodation in some of them is appalling and it needs to be dealt with.
"HMOs' impact on Rhyl and Denbighshire as a whole is huge, in particular on health, crime, education and social service budgets.
"They also have a negative impact on the image of Rhyl."
The council said it was "proud of the fact that it takes such a tough stance against any landlord who fails to comply with housing regulations".
In a statement, the council said four landlords had been taken to court during the last year.
It added that "health and safety of tenants living in private rented accommodation is non-negotiable," and it would not hesitate to prosecute any landlord who failed to adhere to health and safety legislation.
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