Porterref Lake
Porterref Lake in Washington County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.6 ft visibility. Phosphorus: 9 µg/L.
- Clarity
- 6.6 ft
- Trend
- ↓ Declining
- Public access
- Yes
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Why Porterref Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Porterref Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Porterref Lake is a lake in Washington County, Florida. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-04. Grade methodology: LakeQuality methodology.
Watch Porterref Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Porterref Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 6.6 ft. Phosphorus level: 9 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | Not graded |
| Phosphorus | 9 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Porterref Lake
Compare lakeside cabins, hotels, and vacation rentals near Porterref Lake in Washington 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 Porterref Lake
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Recreation & Access
- Tom Johns LandingPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Porterref Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.029 m/yr | 3 |
| Phosphorus | ↓ Declining | +0.43 µg/L/yr | 3 |
EPA Impairment Status
Porterref Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL662 · Official waterbody report · Matched by proximity (0.31 km)
Nearby Lakes in Washington County
Frequently asked questions about Porterref Lake
Where is Porterref Lake?
- Porterref Lake is a lake in Washington County, Florida. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Porterref Lake?
- Porterref Lake in Washington County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.6 ft visibility. Phosphorus: 9 µg/L.
Is Porterref Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Porterref Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Porterref Lake?
- Porterref Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tom Johns Landing. Public access is listed as yes.
Explore Porterref Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection, Northwest District
21FLPNS_WQX4 samples · 2021–2025
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
Named boat-access points from the USGS National Boat Ramps inventory