Mona Lake enjoys equal or better water quality than other similar area lakes but the battle continues against 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...
For the last eight years, we have monitored the water in Mona Lake. The principal indicator of excess nutrients is the level of Phosphorus (P). As you can see in the chart to the right, P levels have fallen dramatically in this time period. Likely contributing factors include:
- Muskegon County banned P in fertilizers ten years ago.
- The US Dept. of Agriculture has installed over 500 acres of vegetated, filter strips between farm fields and streams feeding Mona Lake.
- Numerous homeowners are using bubblers. This increases the oxygen content of the lake which acts to reduce P content.