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:
We 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.
Annual Cost = $220/site ($44/sample)
TSI Sampling Forms and Information
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.