Cigarette Butts in Pond: Toxicity and Cleanup

Neighbor throws cigarette butts in new pond (no fish yet). Asks if they'll kill future fish.

Toxicity

Nicotine + 100+ carcinogens leach into water. Fish eating butts die outright. Even few butts in large pond cause harm.

Cleanup & Prevention

1. Remove all butts immediately.
2. Run activated carbon in filter for 1+ week.
3. Fence or cover pond to prevent access.
4. Document; consider HOA/legal action if persistent.

Malicious pond poisoning (bleach, soap) also occurs. Secure the pond.