Allen Pond
Allen Pond in Prince George's County, Maryland is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility.
- Clarity
- 2.1 ft
- Trend
- ↓ Declining
Why Allen Pond has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Allen Pond, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Allen Pond is a lake in Prince George's County, Maryland. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-10-18. Grade methodology: LakeGrade methodology.
Watch Allen Pond 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 Allen Pond
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 2.1 ft of visibility. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Allen Pond
Compare lakeside cabins, hotels, and vacation rentals near Allen Pond in Prince George's County, Maryland — 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 Allen Pond
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Fishing Allen Pond
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.05 m/yr | 2 |
Nearby Lakes in Prince George's County
Frequently asked questions about Allen Pond
What is the water quality grade for Allen Pond?
- Allen Pond in Prince George's County, Maryland is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility.
Is Allen Pond safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Allen Pond is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Allen Pond across LakeGrade
More Maryland Lake Rankings
Other Lakes in Maryland
Eutrophic Lakes in Maryland
Where this data comes from
30 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples30 samples · 2021–2022
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2022-10-18
Monitoring stations: 1