Lake Iamonia
Leon County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lake Iamonia. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- Public access
- Limited data
Lake Iamonia in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 42 µg/L.
Lake Iamonia is a productive, nutrient-rich eutrophic lake in Leon County, Florida. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 58 other monitored lakes in Leon County, Lake Iamonia ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-10-30. Methodology: how these readings are compared.
What Lake Iamonia is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyBacteria tested: low
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.
Based on E. coli testing, Lake Iamonia rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.7% of 27 samples across 7 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Whether Lake Iamonia 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 Iamonia
These are the measurements Florida DEP publishes for Lake Iamonia, 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 2 ft of visibility. Phosphorus 42 µg/L. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 42µg/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. | 63 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Iamonia
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lake Iamonia typically sits around 74°F at the surface in October. Summer average is about 84°F. Usually warmest in Jul (about 85°F) and coldest in Feb (about 58°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (58°F) to its warmest (85°F).
Typical surface water temperature by month, from 49 field readings (2010–2024) via the EPA Water Quality Portal. See the full Lake Iamonia water temperature breakdown →
Recreation & Access
- Bull Headley LandingPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lake Iamonia
Compare lakeside cabins, hotels, and vacation rentals near Lake Iamonia in Leon 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 Iamonia
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Fishing Lake Iamonia
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-18.25 µg/L/yr5 years
EPA Impairment Status
Lake Iamonia 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 FL442 · Official waterbody report
Nearby Lakes in Leon County
Frequently asked questions about Lake Iamonia
Where is Lake Iamonia?
- Lake Iamonia is a lake in Leon 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 Iamonia?
- Lake Iamonia in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 42 µg/L.
Is Lake Iamonia safe to swim in?
- Based on E. coli testing, Lake Iamonia rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.7% of 27 samples across 7 seasons. That is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Lake Iamonia is safe to swim in today is a call for Florida's water agency and the county health department; check their current beach advisories before you swim.
What is the water temperature of Lake Iamonia?
- Lake Iamonia typically sits around 74°F at the surface in October, from 49 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Are there boat ramps on Lake Iamonia?
- Lake Iamonia has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Bull Headley Landing. Public access is listed as yes.
Can I fish at Lake Iamonia?
- Lake Iamonia has 1 documented boat landing in the USGS National Boat Ramps inventory. 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 Lake Iamonia across LakeQuality
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Where this data comes from
37 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples37 samples · 2020–2024
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
Named boat-access points from the USGS National Boat Ramps inventory