This would be an amendment to the town charter, caused by a new wastewater treatment plant (which led to a dounling and tripling of sewer rates) + higher water rates.
Article has some interesting data, including that the Maryland Municipal League reports that 33 of the state's 156 jurisdictions have recall provisions.
The town council can approve it or voters can get it on the ballot by referendum. The proposed amendment has a 20% registered voter signature requirement. It does not appear to have a time limit for the collection of signatures.