Fish consumption

We test fish from Colorado's waters for toxic substances and issue guidelines for safe eating.

Food safety

Which substances are tested, how levels are determined
 
Sources of mercury, risks of eating contaminated fish, cooking fish, commercially available fish and an introduction to statewide fish advisories
 
Default guidelines for the general population, women who are pregnant or may become pregnant, children ages 6 and younger
 
Site-specific guidelines
Please use the table below to search for water bodies. If it isn't listed, follow the statewide guidelines to protect yourself from the potential risks of eating Colorado fish that have elevated mercury levels. 
 
Mercury tends to accumulate in fish, but not in the water itself. Lake recreation and consumption of drinking water from park facilities are safe activities. Fish are a healthy source of protein that are low in saturated fat and high in omega-3 fatty acids. Eating fish can be good for heart health and children’s growth and development. However, most fish contain traces of mercury. This represents a health risk that must be balanced with the benefits of fish consumption, especially for unborn and developing children.
  • Gross reservoir: Women 18-45 years old and young children should only eat one meal of Lake Trout from this lake per month.
    Everyone else can eat 2 meals of Lake Trout per month. 
  • Lonetree reservoir: ​Young children should not eat Wiper from this lake.  Women 18-45 years old should only eat one meal of Wiper per month.
    Everyone else can eat 2 meals of Wiper per month. 
  • McPhee reservoir: Women 18 - 45 years old and young children should not eat Smallmouth Bass (15 inches or longer) from this lake. Everyone else can eat 1 meal of ​Smallmouth Bass (15 inches or longer) per month.
    Y​oung children should not eat ​Walleye (15 inches or longer) from this lake​.
    ​Everyone else can eat 1 meal of Walleye (15 inches or longer) per month. 
  • Milavec reservoir: Young children should not eat Walleye from this lake. 
    Everyone else can eat 1 meal of Walleye per month. 
  • Rifle Gap reservoir: Woman 18-45 years old and young children should not eat walleye greater than 15 inches in length from this lake.
    Everyone else can eat 8 oz. of walleye greater than 15 inches in length from this lake per month.  

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