New CCTV cameras installed to deter or catch fly-tippers have resulted in 17 cases being investigated.
Durham County Council began installing 24 extra units at hotspots in the county in February.
Neighbourhood wardens had also been given extra training in collecting evidence to identify culprits.
Cabinet member for neighbourhoods Brian Stephens, said it was "encouraging to see that the additional CCTV cameras are proving effective".
The cameras were installed as part of Operation Stop It, a partnership between Durham Constabulary, Crimestoppers and the Environment Agency, which the local authority said was the "biggest-ever crackdown on fly-tipping" in the area.
Council staff had been dealing with more than 2,500 fly-tipping incidents a year.
Offenders can face a fine of up to £50,000.