Treat catch basins and storm drains with larvicide

What to Do

Drop a BTI dunk or granular larvicide into catch basins, storm drains, French drains, and any drainage structure on your property that holds standing water. Treat every 30 days during mosquito season.

Why It Works

Catch basins and storm drains are major mosquito breeding sites that homeowners frequently overlook. They hold stagnant water year-round and are warm, protected environments ideal for larval development. A single untreated catch basin can produce thousands of mosquitoes per week. Treating these hidden sources addresses a root cause rather than just the visible symptoms.

Tips

• BTI is safe for storm drain systems and will not harm aquatic ecosystems downstream
• Check drains after heavy rain to ensure larvicide is still in place
• Treat all drains on the property — including rarely used floor drains in garages and basements
• Some municipalities treat public storm drains but private property drains are the homeowner's responsibility
• Cost: minimal — one BTI dunk per drain per month