Water Quality
The monitoring data collected in 2015 indicate that North Long Lake has good water quality overall. Compared to typical water quality conditions of other lakes within the Northern Lakes and Forest Ecoregion of Minnesota (NLF), North Long Lake ranks highly among other lakes in the ecoregion for the parameters measured. North Long Lake is below or at the low end of the NLF range for phosphorus, and within the expected range for chlorophyll a and Secchi depth at all sites.