The authority’s parking team has launched a crackdown following an increased number of reported thefts.
If the badge is used by anyone who is not the registered holder, for any reason other than to pick up or drop off the badge holder, then it is fraudulent.
The penalty for misuse, on conviction, is between £100 and £1,000, and in most cases the prosecuting council is also awarded costs.
There are 2486 Blue Badges in circulation in Merton.
Users are being reminded the badge remains the property of the issuing authority and may be confiscated upon conviction.