Twin Lakes
Twin Lakes in Okaloosa County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 515 µg/L.
- Clarity
- 2 ft
- Typical in August
- 85°F
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Twin Lakes →
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Twin Lakes is a highly nutrient-loaded hypereutrophic lake in Okaloosa County, Florida. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 14 other monitored lakes in Okaloosa County, Twin Lakes ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-27. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria F · advisory
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.
Based on E. coli testing, Twin Lakes routinely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 38.9% of 18 samples across 4 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2 ft of visibility. Phosphorus level: 515 µg/L. Trophic State Index: 81.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 515 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Twin Lakes
Compare lakeside cabins, hotels, and vacation rentals near Twin Lakes in Okaloosa 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 Twin Lakes are listed below.
Top-rated places to stay near Twin Lakes
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Twin Lakes typically sits around 85°F at the surface in August. Summer average is about 84°F. Usually warmest in Aug (about 85°F) and coldest in Nov (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 34 field readings (2020–2025) via the EPA Water Quality Portal. See the full Twin Lakes water temperature breakdown →
Fishing Twin Lakes
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.05 m/yr | 6 |
| Phosphorus | → Stable | +2.57 µg/L/yr | 6 |
EPA Impairment Status
Twin Lakes is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL917A · Official waterbody report · Matched by proximity (1.12 km)
County Ranking
Ranked #12 of 15 lakes in Okaloosa County
Nearby Lakes in Okaloosa County
Frequently asked questions about Twin Lakes
Where is Twin Lakes?
- Twin Lakes is a lake in Okaloosa County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Twin Lakes?
- Twin Lakes in Okaloosa County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 515 µg/L.
Is Twin Lakes safe to swim in?
- Based on E. coli testing, Twin Lakes routinely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 38.9% of 18 samples across 4 seasons. That works out to a bacteria swim-safety grade of F — a historical summary of past testing, not a current reading. Twin Lakes has a water quality grade of D (Nutrient-rich). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Twin Lakes?
- Twin Lakes typically sits around 85°F at the surface in August, from 34 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
Explore Twin Lakes across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
55 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection, Northwest District
21FLPNS_WQX55 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