Lake Mobile
Lake Mobile in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5.6 ft visibility. Phosphorus: 30 µg/L.
- Clarity
- 5.6 ft
- Typical in July
- 88°F
- Type
- Eutrophic
- Trend
- ↓ Declining
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Lake Mobile is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Lake Mobile ranks #40 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-22. 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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 5.6 ft. Phosphorus level: 30 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | Not graded |
| Phosphorus | 30 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Mobile
Compare lakeside cabins, hotels, and vacation rentals near Lake Mobile in Seminole 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.
Top-rated places to stay near Lake Mobile
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Lake Mobile typically sits around 88°F at the surface in July. Summer average is about 88°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 56 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lake Mobile water temperature breakdown →
Fishing Lake Mobile
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.306 m/yr | 6 |
| Phosphorus | ↓ Declining | +2.41 µg/L/yr | 6 |
EPA Impairment Status
Lake Mobile 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 FL2998A · Official waterbody report · Matched by proximity (1.11 km)
County Ranking
Ranked #40 of 122 lakes in Seminole County
Nearby Lakes in Seminole County
Frequently asked questions about Lake Mobile
Where is Lake Mobile?
- Lake Mobile is a lake in Seminole County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Mobile?
- Lake Mobile in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5.6 ft visibility. Phosphorus: 30 µg/L.
Is Lake Mobile safe to swim in?
- Good for swimming, clear water with low algae levels. Lake Mobile has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Lake Mobile?
- Lake Mobile typically sits around 88°F at the surface in July, from 56 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Lake Mobile across LakeQuality
Planning a trip around Canaveral?
Lake Mobile is about 37 miles from Canaveral National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Canaveral →More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
41 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 samples41 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