Orange-Underhill Lake
Orange-Underhill Lake in Orange County, Florida has a water quality grade of B (Good). Water clarity: 11.3 ft visibility. Phosphorus: 14 µg/L.
- Clarity
- 11.3 ft
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Orange-Underhill Lake is a mesotrophic lake in Orange County, Florida. Water quality is graded B based on 1 sampling years through 2021. Overall water quality is improving over recent sampling years. Compared to the 319 other monitored lakes in Orange County, Orange-Underhill Lake ranks #112 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2021-06-07. 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)
Good clarity, visible to about 11.3 ft. Phosphorus level: 14 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.3 ft | Not graded |
| Phosphorus | 14 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Orange-Underhill Lake
Compare lakeside cabins, hotels, and vacation rentals near Orange-Underhill Lake in Orange 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 Orange-Underhill Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Fishing Orange-Underhill Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.781 m/yr | 5 |
| Phosphorus | → Stable | -0.3 µg/L/yr | 5 |
EPA Impairment Status
Orange-Underhill Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL3168Z4 · Official waterbody report · Matched by proximity (0.99 km)
County Ranking
Ranked #112 of 320 lakes in Orange County
Nearby Lakes in Orange County
Frequently asked questions about Orange-Underhill Lake
Where is Orange-Underhill Lake?
- Orange-Underhill Lake is a lake in Orange County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Orange-Underhill Lake?
- Orange-Underhill Lake in Orange County, Florida has a water quality grade of B (Good). Water clarity: 11.3 ft visibility. Phosphorus: 14 µg/L.
Is Orange-Underhill Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Orange-Underhill Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Orange-Underhill Lake across LakeQuality
Planning a trip around Canaveral?
Orange-Underhill Lake is about 39 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
Mesotrophic Lakes in Florida
Where this data comes from
23 measurements from 4 monitoring stations, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX23 samples · 2020–2021
Monitoring station identifiers (4)
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