• 950 Maidu Avenue, Suite 170
    Nevada City, Nevada
  • Fax
  • Business Line
    530-265-1222 option 3

The Environmental Health Department of the Nevada County Community Development Agency is responsible for programs focused on environmental protection and some aspects of public health in Nevada County. These programs regulate food preparation in restaurants, installation of wells and septic systems, handling hazardous materials and other topics related to consumer protection.

For food poisoning complaints please be prepared to provide a three day food history if possible.

Mosquito fish for CLOSED-SYSTEM ponds
From time to time there are giveaways of mosquito fish. Mosquito fish can consume large quantities of insect larvae in your pond or other standing bodies of water. By reducing the mosquito population, you can reduce your risk of contracting mosquito-borne diseases including the West Nile Virus. These fish are not native, they are invasive species. These fish are only meant for closed/stagnant ponds. They should not be placed into ponds that can drain into the local creeks and streams. This can have negative impacts on the native ecosystem. If your pond has outlets, please do not acquire these fish.

2024 Mosquito Fish Giveaways
Where: Eric Rood Administrative Building parking lot, 950 Maidu Ave, Nevada City
When: 10am-12pm on
  • Thursday, May 9
  • Wednesday, May 22
  • Thursday, June 13
  • Wednesday, June 26
  • Thursday, July 11


  • If your pond or body of water has an outlet, please do not acquire these fish as they are non-native.
  • Drive-thru pick-ups only; please remain in your car. Containers will be provided to safely take the fish home.
  • The fish will eat mosquito larvae in ponds, watering troughs, birdbaths, and unused swimming pools. If your pond already has larger fish in it, you don’t need mosquito fish. The larger fish will eat the smaller mosquito fish. Also, the larger fish will eat mosquito larvae, and certainly, their smaller offspring will eat larvae too. Again, if your pond or body of water has an outlet, please do not acquire these fish as they are non-native.
  • The Nevada County Environmental Health Department provides on-site service visits for treatment requests. Call the Vector Control Program at 530-265-1500.
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