The city won't be able to help since watershed is the county. I've never had to contact them for something like this, but have gotten responses by both phone and email from https://www.dekalbcountyga.gov/watershed-management/watershed-management

I tried no one answered v

I can help submit to the county via this website:
https://www.dekalbcountyga.gov/form/all-water-quality-and-water-sewe

Please email me at cara.scharer@decaturga.com