Trucks began dumping waste at the site in August

The Hafod Environmental Group sent six questions to Merseyside Waste Disposal Authority (MWDA), which were answered at a public meeting.

The campaigners asked why it used a site "many miles across the border".

MWDA said the site provided "much needed" landfill for councils and trade customers in north Wales and surrounding areas.

Mersey Waste Holdings began tipping household rubbish at Hafod Quarry on behalf of the authority in August, after obtaining permission in 1995 from the then secretary of state for Wales.

We hope that they will reconsider how long they can dump on our doorstep Campaigner Pauline Smout

The company also has permission from the Environment Agency.

The firm has said it will comply with the strict planning conditions to protect the site, a protected haven for great crested newts and other wildlife.

In September, Environment Minister Carwyn Jones said he would not meet protesters, because he said he wanted to remain neutral on the issue.

The campaigners have asked him to end the planning permission allowing the Merseyside firm to dump the waste.

Action group chair Pauline Smout, speaking before the meeting, said members wanted perhaps to bring "impetus for change".

She said: "We believe they have been dumping illegally, but they claim they are entitled to landfill in one corner of the quarry based on very old planning permission".

Ms Smout said the company could not sustain tipping at the site for very long, because it could only use one small corner of the quarry.

"We're asking them what happened to �6m of recycling money given to them and how long do they think they can tip in our area.

"In our immediate area there are three major landfills within a couple of miles - it's just outrageous," she said.

"We hope that they will reconsider how long they can dump on our doorstep. [They need] to use the facilities within their own boundaries."

In its response, MWDA said Hafod's effect on the local community had been found to be "not unacceptable" by the original planning inspector.

The authority said it took "very seriously" the safe operation of the site and all operations on site were monitored by the Environment Agency.

It said it had also put �5m of government money towards a �10m waste management facility at Bidston on the Wirral, which would help dramatically increase recycling rates for household waste on Merseyside.