Spring Phosphorus

Phosphorus is an essential nutrient that fuels aquatic food webs by supporting algae and aquatic plant growth. However, excessive phosphorus can build up in lakes over time because of human activities on the shoreline and in the watershed. High levels of phosphorus can cause undesirable lake conditions such as frequent algal blooms and loss of deep water oxygen.

Spring total phosphorus is used to estimate the overall amount of phosphorus in your lake. Annual spring phosphorus measurements provide the data needed to recognize positive or negative trends in water quality. Check out our spring phosphorus fact sheet to learn more.

Spring Phosphorus measurements are taken over the deepest location in a lake within two weeks of lake ice-out. Volunteers will need a canoe, kayak, paddleboat, or motor boat.

Details

• Cost to enroll: $30/ year

• Enrollment deadline: March 1, 2025

• Equipment requirements: Sample collection bottles are included with the enrollment fee and will be mailed to the Lead Volunteer.

• Time commitment: Volunteers collect Spring Phosphorus samples once per year within two weeks of ice-out.

• Training requirement: Training for this parameter is optional, but recommended. See training events here and watch the recorded phosphorus training videos below.

How do I measure Spring Phosphorus?

• Phosphorus Procedure Checklist

• 2025 Spring Phosphorus Sampling Schedule

• 2025 Spring Phosphorus Data Form

• Phosphorus Recorded Training Presentation (2024)

• Visit the Training Page for in-person and virtual training events.

Additional Information

• Phosphorus Fact Sheet

• Sampling Reminders

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