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.

Web pages

• Environmental Health - https://www.nevadacountyca.gov/1470/Environmental-Health
• Environmental Health Services (including how to report an Environmental Health issue) - https://www.nevadacountyca.gov/1572/Services
• West Nile Virus & Mosquito Prevention (including info about mosquito fish give away events) - https://www.nevadacountyca.gov/2291/West-Nile-Virus-Mosquito-Prevention