Lac à la Tortue
Urban agglomeration of Longueuil, QuébecView mapDirections
This is MELCCFP's own trophic classification for 2025, not a LakeQuality grade. See every year
Lac à la Tortue in Urban agglomeration of Longueuil, Québec is classified zone de transition méso-eutrophe by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) for 2025. Water clarity: 2.2 m visibility. Phosphorus: 17.9 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
Stays via Stay22
Stays near Lac à la Tortue
Compare lakeside cabins, hotels, and vacation rentals near Lac à la Tortue in Urban agglomeration of Longueuil, Québec — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lac à la Tortue
Prices for Sep 18–20, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Lac à la Tortue’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Lac à la Tortue is a lake in Urban agglomeration of Longueuil County, Québec.
Source: Québec RSVL (MELCCFP) — not the EPA Water Quality Portal, last sampled 2025-08-01. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lac à la Tortue is safe to swim in today is a call for le Ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lac à la Tortue
These are the measurements MELCCFP publishes for Lac à la Tortue, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.2 ft. Phosphorus 17.9 µg/L. Chlorophyll-a 6.4 µg/L.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 m | Measured, not scored |
| Phosphorus | 17.9 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 6.4 µg/L | Measured, not scored |
Fishing Lac à la Tortue
Nearby Lakes in Urban agglomeration of Longueuil
Frequently asked questions about Lac à la Tortue
Ask about Lac à la Tortue
Answers come straight from the public measurements and survey records on this page.
Where is Lac à la Tortue?
- Lac à la Tortue is a lake in Urban agglomeration of Longueuil, Québec. MELCCFP classifies it zone de transition méso-eutrophe for 2025. This is MELCCFP's own trophic classification for 2025, not a LakeQuality grade.
What is the water quality of Lac à la Tortue?
- Lac à la Tortue in Urban agglomeration of Longueuil, Québec is classified zone de transition méso-eutrophe by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) for 2025. Water clarity: 2.2 m visibility. Phosphorus: 17.9 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
Is Lac à la Tortue safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lac à la Tortue across LakeQuality
More lakes in Québec
Other Lakes in Québec
The authority’s own classification
Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) publishes its own classification for Lac à la Tortue. It is shown here as theirs, in their words, and is not folded into the LakeQuality letter.
This is MELCCFP's own trophic classification for 2025, not a LakeQuality grade.
A trophic class ranks how nutrient-rich a lake is, from oligotrophic at the low end to eutrophic at the high end. It describes nutrients and plant growth, not bacteria, and it is not a swimming clearance.
Earlier years (18 classified 2014–2025)
| Year | Published class |
|---|---|
| 2024 | zone de transition méso-eutrophe |
| 2023 | classe eutrophe |
| 2022 | classe eutrophe |
| 2021 | zone de transition méso-eutrophe |
| 2020 | classe mésotrophe |
| 2019 | classe mésotrophe |
| 2018 | zone de transition méso-eutrophe |
| 2017 | zone de transition méso-eutrophe |
| 2016 | zone de transition méso-eutrophe |
| 2015 | zone de transition méso-eutrophe |
| 2014 | classe mésotrophe |
Published by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec). A classification is not a same-day swimming clearance. See data sources.
Where this data comes from
Measurements for Lac à la Tortue come from the Réseau de surveillance volontaire des lacs (RSVL), not the EPA Water Quality Portal. Per-sample source details are not recorded for this lake. MELCCFP RSVL (CC BY 4.0). See data sources.