Figures published this afternoon show that as of the start of this week, 68% of eligible households in Donegal still haven't registered for septic tank charge.
Nationlly, the figure is almost 40%.
Figures from the Department of the Environment show 300,000 homes have been registered across the country. In Donegal, the figure is just over 10,000.
According to the Department of the Environment, there are 32,955 on-site waste water systems in Donegal, based on returns from the 2011 census. That's the third highest figure in the state, after Cork and Galway.
Of these, 10,471 have been registered, leaving 22,484 outstanding.
That represents a compliance rate of 32%, the joint lowest along with South Dublin.
Nationally, the compliance rate is just over 60%.
The government is stressing that households who register by February 1st will be eligible for financial support if they fail an inspection, with opponents hitting out at the fact that the EPA's inspection criteria haven't yet been published.