MLIA Water Quality Operations
Mona Lake enjoys better water quality than most area lakes but the battle continues both against sins of the past and ongoing issues with stream runoff feeding into Mona Lake. Mona Lake is rated as "good" by the US EPA and the water is classified as Eutrophic*. The trophic classification system was developed to rate lakes based on clarity, Chlorophyll-A content and Phosphorous Content. Eutrophic lakes include some of the most highly prized recreational lakes in the state and may have excellent recreational water quality with few adverse conditions, one of which may be nuisance algal blooms.
This year (2014) the MLIA will again contract with Aquatic Nuisance Plant Control but we are hoping to improve our treatment and use fewer chemicals. We will selectively treat for Milfoil, but only in the areas where it is emerging. We will test the water and monitor for the beginning of algae formation.
The MLIA also regularly treats for eurasian milfoil. Lake Cadillac allowed the mifoil to get out of control and their cost was $275 for each lakefront homeowner over an initial three year period. Obviously, some form of continued treatment will be required. Chemical treatments are reliable and effective. Weevils (insects that eat algae) are a possible alternative but have inconsistent results and are more expensive. "The idea of using a native insect to control an exotic plant is attractive, but milfoil weevils do not yet provide predictable or reliable Eurasian milfoil control. Additional research is needed to evaluate the full potential of weevil stocking as a long-term Eurasian milfoil control technique." Tony Groves, Progressive A&E
* Spatial and temporal variability of internal and external phosphorous loads in Mona Lake Michigan by Alan Steinman et al. also 1979 Inland Lake Self Help Program Annual Report by Michigan DNR, Water-Quality Characteristics of Michigan's Inland Lakes, 2001-10, USGS.