And in further good news for the royal borough, the Junkwize.com findings show an increase in the number of people caught committing the offence.
The figures, released by the council following a freedom of information request, compared the first six months of 2015 with the first six months of 2014.
They also show how fly-tipping differs from borough to borough.
And in Westminster, which has been fighting a long-running battle against the scourge, the number of incidents are down, as are the number of people caught.
The Junkwize figures showed incidents of fly-tipping in K&C had fallen by 1.16% to 2,978 this year, but despite this decrease the number of fixed penalty notices issued had leapt from 67 in 2014 to 188 in 2015. Prosecutions have, however, fallen from five in 2014 to three this year.
In Westminster, instances of fly-tipping were down 20.93% to 6,721 in 2015, while enforcement actions were also down 72.97% to 720.
Hammersmith & Fulham saw a big rise this year, with an increase of 23.84% to 4,882. Prosecutions have increased from two to six, and fixed penalty notices have increased from eight to 30 - a rise of 275% which reflects the number of fly tipping incidents has grown.
Alex Maccioni, the founder of Junkwize, said: “What’s fascinating about the fly-tipping statistics we’ve gathered is just how varied they are. I know from experience that topography, demographics and councils all influence these figures, but the extent of the variations really did surprise me and the rest of my team.
“Every borough has a significant fly tipping problem, so something has to change. Based on experience, I know that change is only going to come through education and tough prosecutions.”