Lake Norris
Lake County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lake Norris. Here is what has been measured.
- Hypereutrophic
- Impaired · Mercury
- Limited data
Lake Norris in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 88 µg/L.
Lake Norris is a highly nutrient-loaded hypereutrophic lake in Lake County, Florida. Water clarity is improving over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Lake Norris ranks #128 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-16. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Lake Norris on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Lake Norris is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury). Check local advisories before you swim.
Whether Lake Norris is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Norris
These are the measurements Florida DEP publishes for Lake Norris, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.3 ft of visibility. Phosphorus 88 µg/L. TSI 71.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 88µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 71 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Lake Norris
Compare lakeside cabins, hotels, and vacation rentals near Lake Norris in Lake 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Lake Norris are listed below.
Top-rated places to stay near Lake Norris
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Fishing Lake Norris
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2025).
Water clarity
Improving4 years
Phosphorus
Worsening+6.55 µg/L/yr5 years
EPA Impairment Status
Lake Norris is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2929B · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Lake Norris
Where is Lake Norris?
- Lake Norris is a lake in Lake County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lake Norris?
- Lake Norris in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 88 µg/L.
Is Lake Norris safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Norris is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury). Check local advisories before you swim.
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Where this data comes from
5 measurements from 2 monitoring stations, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples3 samples · 2024–2025
- Submitting organization not recorded for these samples2 samples · 2025
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database