Grdnlk Lake
Seminole County, FloridaView mapDirections
No nutrient or algae sampling on record from Florida DEP for this lake.
- Impaired · Impaired biota (cause unknown)
- Limited data
Grdnlk Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported.
Grdnlk Lake is a lake in Seminole County, Florida. Water clarity is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-10-23. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Grdnlk Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown). Check local advisories before you swim.
Whether Grdnlk 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 Grdnlk Lake
These are the measurements Florida DEP publishes for Grdnlk Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Grdnlk Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Grdnlk Lake
Compare lakeside cabins, hotels, and vacation rentals near Grdnlk Lake in Seminole 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 Grdnlk Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Follow Grdnlk Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Grdnlk Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Improving-3.06 µg/L/yr6 years
EPA Impairment Status
Grdnlk Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit FL3009I · Official waterbody report
Nearby Lakes in Seminole County
Frequently asked questions about Grdnlk Lake
Where is Grdnlk Lake?
- Grdnlk Lake is a lake in Seminole County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Grdnlk Lake?
- Grdnlk Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported.
Is Grdnlk Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Grdnlk Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown). Check local advisories before you swim.
Explore Grdnlk Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Where this data comes from
2 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples2 samples · 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