Portneuf County Lake Quality

Québec, 23 lakes, average grade A (Excellent)

Portneuf County's 23 graded lakes fall in the moderate-density bracket for Québec. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. The county's average grade is A — among the cleanest in Québec. 14 lakes pull an A on their own, and almost none fall into the D or F brackets.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lac ÉMeraude (A); the most-stressed is Lac Alain (B).

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Quick Answers for Portneuf County

Cleanest lakes in Portneuf County →Cleanest lakes in Québec →Safest swimming lakes in Québec →

Planning a trip? Check special fishing regulations for Lac ÉMeraude — or check the official Québec fishing regulations.

All Lakes in Portneuf County

Rank	Lake	Grade	Clarity	Phosphorus
1	Lac ÉMeraude	A	23.5 ft	2.6 µg/L
2	Lac Clair	A	26.6 ft	2.5 µg/L
3	Lac à L'Anguille	A	17.7 ft	3.6 µg/L
4	Lac Rita	A	27.6 ft	5.4 µg/L
5	Lac Bleu	A	10.8 ft	8 µg/L
6	Lac Simon	A	13.8 ft	3.5 µg/L
7	Lac Carillon	A	13.3 ft	4.8 µg/L
8	Lac Blanc	A	11.5 ft	6.6 µg/L
9	Lac Montauban	A	12.6 ft	6.4 µg/L
10	Lac Long	A	13.8 ft	6 µg/L
11	Lac Sainte-Anne	A	12 ft	5.3 µg/L
12	Lac Aux CèDres	A	11.2 ft	5.4 µg/L
13	Le Gros Lac	A	14.8 ft	5 µg/L
14	Lac Sept ÎLes	A	11.8 ft	7.3 µg/L
15	Lac Sergent	B	11.2 ft	8.6 µg/L
16	Lac Perreault	B	7.5 ft	6.1 µg/L
17	Lac Travers	B	9.8 ft	5 µg/L
18	Lac Morasse	B	9.5 ft	6.3 µg/L
19	Lac Vert	B	13.5 ft	5.8 µg/L
20	Lac de la Ferme	B	9.5 ft	7.1 µg/L
21	Lac Alain	B	6.7 ft	7.8 µg/L
22	Lac de L'Oasis	B	5.9 ft	12.3 µg/L
23	Lac à la Hache	B	4.6 ft	10.2 µg/L