Mosquito Control in an Unused Water Feature

Australian rental, 1.5m × 0.4m water feature, stagnant 1+ year. Mosquito larvae everywhere. Want them gone without high electric bills.

Immediate Steps

1. Drain Completely: Use the feature’s own pump (if submersible) to empty. Or siphon with garden hose.
2. Scrub & Dry: Remove all sludge, algae, leaves. Let basin dry 48 hrs—kills remaining eggs.
3. Decision Point:
   • If keeping: Run pump 24/7. Moving water prevents egg-laying. Add mosquito fish (Gambusia) if legal in your state.
   • If not keeping: Fill with soil/gravel. Plant bog garden. Zero maintenance, zero mosquitoes.

Energy Cost Reality

Typical 400 L/hr pump: ~$0.75 USD/day. Not trivial for a rental. Solar pumps exist but lack night flow—mosquitoes lay at dusk.

Chemical Warning

Mosquito dunks (Bti) work but harm non-target insects. Oils/films harm birds. Avoid in wildlife-friendly yards.

Best long-term fix: **Fill it in.** Landlord will likely prefer a planter over a mosquito factory.