Two women have been hit in the pocket after they blanked requests for details which could help a probe into a flytipping incident.
Christine Cobb, 51, of Highfield Road in South Shields, and Danielle Hawes, 31, of Byron Avenue in Boldon Colliery, were both fined £220.
In addition, they were both ordered to pay a victim surcharge of £30 and costs of £100.
South Tyneside Magistrates' Court was told that a quantity of waste, mainly comprising of tyres, wood and a bed frame, was found abandoned on a public footpath on Slake Road in Jarrow.
Evidence from the scene led officers to Cobb who was invited to attend for interview.
However, when the defendant failed to respond after three weeks, a notice was issued, requiring her to make herself available to answer questions about the abandoned waste.
She failed to respond to either the invitation or the notice, thereby committing an offence under section 110 of the Environment Act.
The court was also told that a quantity of domestic waste was found abandoned at Gibbons Walk in South Shields.
Evidence led officers to the defendant and, as only a small quantity of waste was abandoned, tried to deal with the matter informally.
Officers left a calling card asking the defendant to attend an interview.
However, after 20 days when officers had not heard from her, they issued a notice for her to make herself available to answer questions.
The notice was ignored by the defendant who thereby committed an offence under section 110 of the Environment Act.
A spokesman for the council said: “It is completely unacceptable for a tiny minority of residents to blight the beauty of South Tyneside in this way.
"We already spend around £2.2 million each year keeping the borough clean and tidy and this irresponsible behaviour simply places an additional financial burden on taxpayers who ultimately have to bear the cost of removing the waste and investigating these offences.”
Anyone who witnesses incidents of fly-tipping are asked to Report It! by calling (0191) 427 7000.
For further information about the many ways waste can be safely responsibly disposed of in South Tyneside visit www.southtyneside.gov.uk/wasteandrecycling.