MMSD Freshwater Resources Monitoring: 2025 Annual Summary

The Freshwater Resources Monitoring group conducts routine surface water monitoring at nearly 100 fixed monitoring sites within the MMSD planning area and Lake Michigan. Field measurements and grab samples are taken at these sites under all weather conditions and brought to the in-house certified laboratory for analysis of almost 40 different parameters.

To summarize the large amount of data collected each year, the Freshwater Resources Monitoring group produces an annual report that highlights a specific subset of parameters and/or sites. The parameters highlighted in this report have numeric criteria established by the WDNR and are common pollutants in the region.​