Summer Trophic Status Index (TSI) Monitoring
What is Trophic Status Index (TSI)?The Carlson Trophic Status Index (TSI) is a tool used to summarize measurements of water quality into one index value. This value can be used to compare lakes in the same region or as a historical comparison of improvement or degradation over time.
TSI Values are calculated based on 3 measurements:
Sampling ProcedureWe recommend completing this monitoring on a monthly basis from May through September each summer. Volunteers typically collect the samples, however A.W. Research staff can train volunteers or to collect the samples for an additional fee.
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Interested in starting a monitoring program on your lake?
Contact: Sarah Fogderud Client Services Manager sarah@awlab.com 218-829-7974 Annual Cost = $260 prepaid
or $58 per sample billed TSI Sampling Forms and Information![]()
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![]() After several years of sampling data has been collected, we are able to look at the long-term trend of the lake. This graph shows the average TSI for all samples collected for each month during the sampling season. This analysis helps us to understand the nutrient cycle of the lake and identify potential sources of pollution.
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