Putnam-Blue Lake
- +Two grade letters higher (D → B)
- ++5.4 ft water clarity
- +Lower phosphorus (14 vs 74.5 µg/L)
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lochloosa Lake @ Park carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Putnam-Blue Lake (Putnam County, Grade B, 3.9 mi away) is the closest meaningful upgrade.
5 cleaner lakes sit within 30 miles of Lochloosa Lake @ Park in the EPA water-quality dataset. With that many higher-grade neighbors close by, Lochloosa Lake @ Park's Grade D reflects something specific to the lake itself — not a regional water-quality ceiling. The neighbor list below isn't a small set of marginal upgrades; it's a real cohort of meaningfully cleaner choices for the same Florida weekend.
The closest cleaner alternative — Putnam-Blue Lake in Putnam County, Grade B — sits 3.9 miles from Lochloosa Lake @ Park. At that distance, the substitution cost is essentially zero: same drive time, same regional access, demonstrably cleaner water on the EPA indicators. For repeat visitors who care about clarity or phosphorus levels, swapping the routine to Putnam-Blue Lake is mostly a habit change rather than a logistics change.
The EPA water-quality grading combines clarity (Secchi depth), phosphorus, and chlorophyll-a measurements from state environmental sampling. A higher letter grade reflects measurably cleaner water on those indicators, not subjective beauty or access quality — a Grade A lake might have worse boat-launch facilities or shoreline access than a Grade C neighbor, so the ranking is one input alongside the rest of trip planning. See the methodology page for the full grading formula.
Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.