Ker Lake
Marion County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Ker Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
Ker Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 9.8 ft visibility. Phosphorus: 13.7 µg/L.
Ker Lake is a mesotrophic lake in Marion County, Florida. Water clarity is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 17 other monitored lakes in Marion County, Ker Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-20. Methodology: how these readings are compared.
What Ker Lake is good for
From access and monitoring records, not editorial picks.
- Clear water9.8 ft of visibility
Swimming conditions
Readings onlyLow algae
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. Ker Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Ker 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 Ker Lake
These are the measurements Florida DEP publishes for Ker Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.8 ft. Phosphorus 13.7 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13.7µg/L | Good 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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Ker Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Ker Lake typically sits around 78°F at the surface in October. Summer average is about 87°F. Usually warmest in Aug (about 88°F) and coldest in Dec (about 62°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (62°F) to its warmest (88°F).
Typical surface water temperature by month, from 62 field readings (2010–2025) via the EPA Water Quality Portal. See the full Ker Lake water temperature breakdown →
Stays via Stay22
Stays near Ker Lake
Compare lakeside cabins, hotels, and vacation rentals near Ker Lake in Marion 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 Ker Lake
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Fishing Ker Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Improving-5.1 µg/L/yr5 years
EPA Impairment Status
Ker 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 FL2899B · Official waterbody report
Nearby Lakes in Marion County
Frequently asked questions about Ker Lake
Where is Ker Lake?
- Ker Lake is a lake in Marion County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Ker Lake?
- Ker Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 9.8 ft visibility. Phosphorus: 13.7 µg/L.
Is Ker Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Ker Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
What is the water temperature of Ker Lake?
- Ker Lake typically sits around 78°F at the surface in October, from 62 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Can I fish at Ker Lake?
- Public access to Ker Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Florida's fish and wildlife agency, so check its current regulations before you go.
Explore Ker Lake across LakeQuality
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Where this data comes from
82 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX82 samples · 2020–2025
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