Total Suspended Solids (TSS) is how much sediment is in the water during sampling. The central standard is about 30 mg/L. Lake Koronis was measured to be at about 10 mg/L, so we are at a good level!

Total Kjeldahl Nitrogen (TKN) is the total concentration of organic nitrogen and ammonia. Nitrogen levels have been consistent throughout the last few years.

Total Phosphorus (TP) is a measure of all phosphorous, dissolved and solid, in a sample. It's commonly used to find the health of the water. The Central Regional Standard for phosphorus is around 0.100 mg/L.

There is an internal load of phosphorous. The committee works with the shore owners to do a preliminary assessment, contact the appropriate agency, discuss the situation, and work with the agency to work through a plan, permit, and grant if it is approved. 

E. coli is an indication of sewage or animal waste contamination in water. The Central Region Standard for E. coli is 126orgs/100mL. Some areas of Lake Koronis were well above the standard, so the Watershed and KLA are working on ways to address it. 

Carlson’s Trophic Status (TSI) is a benchmark for lake water quality, by the Secchi disk, Chlorophyll 'a”, and total phosphorus. 

When the TSI is from 51-70, the water is in a Eutrophic state. The water has decreased transparency and lower levels of oxygen in the summer. There are evident weed problems. When the TSI is from 51-50, the water is in a Mesotrophic state. The water will be moderately clear with some probability of no oxygen in the lowest levels during the summer. Through July, we see some clearer water in a mesotrophic state, but as we get into August and September, the lake enters a eutrophic state.

On the South side of Lake Koronis, the mean TSI is decreasing. We are 99.9% confident that this shows that water quality is improving. 

On the North side of Lake Koronis, the mean TSI is also decreasing. We are 95% confident that this shows that water quality is improving.