The overall conclusion from the analysis of the Detroit Municipal Water intake and crib samples is that for the most part intake samples can be a useful tool for monitoring Lake Huron water quality. Most of the physical, chemical, and biological variables did not change significantly between the lake and the filtration plant. The most notable variation was in chlorophyll samples where the difference between plant and lake means usually exceeded 30% for two of the three field trips. The consideration of dissolved and total metals data did not yield such an optimistic set of results as the other variables. Differences between several of the means exceeded 100% and in extreme cases 500%. For example, Mg and dissolved Mg values were identical (and invariant) between lake and plant among all field trips.