1
ALac Pierre
Matawinie County, Québec · 0.7 mi from Lac Arbour
- +Two grade letters higher (C → A)
- ++13.4 ft water clarity
- +Lower phosphorus (6.7 vs 28.1 µg/L)
Cleaner Lakes Than Lac Arbour
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lac Arbour carries a Grade C (Fair) water quality score. Within 30 miles, 5 lakes hold a higher grade. Lac Pierre (Matawinie County, Grade A, 0.7 mi away) is the closest meaningful upgrade.
Reviewed by LakeQuality Editorial Team · Updated
2
ALac Rouge
Matawinie County, Québec · 1.2 mi from Lac Arbour
- +Two grade letters higher (C → A)
- ++18.3 ft water clarity
- +Lower phosphorus (4.2 vs 28.1 µg/L)
3
ALac Cloutier
Matawinie County, Québec · 1.7 mi from Lac Arbour
- +Two grade letters higher (C → A)
- ++13.4 ft water clarity
- +Lower phosphorus (3.9 vs 28.1 µg/L)
4
ALac Stevens
Matawinie County, Québec · 1.8 mi from Lac Arbour
- +Two grade letters higher (C → A)
- ++12.1 ft water clarity
- +Lower phosphorus (6.2 vs 28.1 µg/L)
5
ALac Patrick
Matawinie County, Québec · 1.8 mi from Lac Arbour
- +Two grade letters higher (C → A)
- +Lower phosphorus (4.3 vs 28.1 µg/L)
Reading the cohort
5 cleaner lakes sit within 30 miles of Lac Arbour in the EPA water-quality dataset. With that many higher-grade neighbors close by, Lac Arbour's Grade C 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 Québec weekend.
The closest cleaner alternative — Lac Pierre in Matawinie County, Grade A — sits 0.7 miles from Lac Arbour. 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 Lac Pierre 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.
How this list is built
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.