Lake Piney-Z
Lake Piney-Z in Leon County, Florida has a water quality grade of B (Good). Water clarity: 4.8 ft visibility. Phosphorus: 40.5 µg/L. Surface area: 63 acres.
- Clarity
- 4.8 ft
- Typical in August
- 90°F
- Area
- 63 acres
- Type
- Eutrophic
- Trend
- → Stable
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Lake Piney-Z is a 63-acre productive, nutrient-rich eutrophic lake in Leon County, Florida. Water quality is graded B based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 58 other monitored lakes in Leon County, Lake Piney-Z ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-10-29. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria A
Based on clarity and algae grades from past sampling — we do not hold 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 Piney-Z never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 30 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.
Water Quality Grade: B (Good)
Murky, only visible to about 4.8 ft. Phosphorus level: 40.5 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | Not graded |
| Phosphorus | 40.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Piney-Z
Compare lakeside cabins, hotels, and vacation rentals near Lake Piney-Z 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 Piney-Z
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Water Temperature
Lake Piney-Z typically sits around 90°F at the surface in August. Summer average is about 88°F. Usually warmest in Aug (about 90°F) and coldest in Jan (about 53°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 61 field readings (2010–2024) via the EPA Water Quality Portal. See the full Lake Piney-Z water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 63 acres |
No bathymetric survey has been published for Lake Piney-Z, so its depth is not documented here.
Fishing Lake Piney-Z
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.09 m/yr | 5 |
| Phosphorus | ↓ Declining | +6.27 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Lake Piney-Z is a man-made reservoir impounded by the Piney"Z"Lake Dam (completed 1970), built primarily for recreation on the St Marks River; earth-type dam, 18 ft tall and 600 ft long.
- Surface area
- 63 ac
- Normal storage
- 1,003 ac-ft
- Max storage
- 1,129 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- PINEY "Z" ESTATE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID FL00530 · Operator website
EPA Impairment Status
Lake Piney-Z is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL756B · Official waterbody report
County Ranking
Ranked #17 of 59 lakes in Leon County
Nearby Lakes in Leon County
Frequently asked questions about Lake Piney-Z
Where is Lake Piney-Z?
- Lake Piney-Z is a lake in Leon County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Piney-Z?
- Lake Piney-Z in Leon County, Florida has a water quality grade of B (Good). Water clarity: 4.8 ft visibility. Phosphorus: 40.5 µg/L. Surface area: 63 acres.
Is Lake Piney-Z safe to swim in?
- Based on E. coli testing, Lake Piney-Z never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 30 samples across 7 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Lake Piney-Z has a water quality grade of B (Good). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Lake Piney-Z?
- Lake Piney-Z typically sits around 90°F at the surface in August, from 61 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Lake Piney-Z across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
42 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 samples42 samples · 2020–2024
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database