Nors Lake
Lake County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Nors Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- Limited data
Nors Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.2 ft visibility. Phosphorus: 50.8 µg/L.
Nors Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water clarity is improving over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Nors Lake ranks #108 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-08-15. Methodology: how these readings are compared.
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. Nors Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury). Check local advisories before you swim.
Whether Nors Lake 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 Nors Lake
These are the measurements Florida DEP publishes for Nors Lake, 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 1.2 ft of visibility. Phosphorus 50.8 µg/L. TSI 68.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 50.8µg/L | Fair 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. | 68 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
Water Temperature
Nors Lake typically sits around 78°F at the surface in October. Summer average is about 85°F. Usually warmest in Aug (about 86°F) and coldest in Dec (about 63°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (63°F) to its warmest (86°F).
Typical surface water temperature by month, from 27 field readings (2017–2022) via the EPA Water Quality Portal. See the full Nors Lake water temperature breakdown →
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Stays near Nors Lake
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Fishing Nors Lake
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
Nors Lake 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 Nors Lake
Where is Nors Lake?
- Nors Lake 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 Nors Lake?
- Nors Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.2 ft visibility. Phosphorus: 50.8 µg/L.
Is Nors Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Nors Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, metals (other than mercury). Check local advisories before you swim.
What is the water temperature of Nors Lake?
- Nors Lake typically sits around 78°F at the surface in October, from 27 EPA Water Quality Portal field readings (2017–2022). That is a typical value for the month, not a live reading.
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Where this data comes from
34 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX34 samples · 2020–2022
Monitoring station identifiers (1)
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