Chateau Sur Mer Lake
Chateau Sur Mer Lake in Lee County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 123 µg/L.
- Typical in August
- 87°F
- Type
- Hypereutrophic
- Trend
- ↑ Improving
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Chateau Sur Mer Lake →
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Chateau Sur Mer Lake is a highly nutrient-loaded hypereutrophic lake in Lee County, Florida. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 73 other monitored lakes in Lee County, Chateau Sur Mer Lake ranks #47 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-22. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 123 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 123 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Chateau Sur Mer Lake
Compare lakeside cabins, hotels, and vacation rentals near Chateau Sur Mer Lake in Lee County, Florida — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Chateau Sur Mer Lake are listed below.
Top-rated places to stay near Chateau Sur Mer Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Chateau Sur Mer Lake typically sits around 87°F at the surface in August. Summer average is about 86°F. Usually warmest in Jul (about 89°F) and coldest in Feb (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 12 field readings (2020–2025) via the EPA Water Quality Portal. See the full Chateau Sur Mer Lake water temperature breakdown →
Fishing Chateau Sur Mer Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -54 µg/L/yr | 2 |
EPA Impairment Status
Chateau Sur Mer Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2092G1 · Official waterbody report · Matched by proximity (2.74 km)
County Ranking
Ranked #47 of 74 lakes in Lee County
Nearby Lakes in Lee County
Frequently asked questions about Chateau Sur Mer Lake
Where is Chateau Sur Mer Lake?
- Chateau Sur Mer Lake is a lake in Lee County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Chateau Sur Mer Lake?
- Chateau Sur Mer Lake in Lee County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 123 µg/L.
Is Chateau Sur Mer Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Chateau Sur Mer Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Chateau Sur Mer Lake?
- Chateau Sur Mer Lake typically sits around 87°F at the surface in August, from 12 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
Explore Chateau Sur Mer Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
5 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples5 samples · 2020–2025
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database