Pocumcus Lake
Washington County, MaineView mapDirections
Maine DEP publishes the water-quality measurements for Pocumcus Lake. Here is what has been measured.
- Oligotrophic
- Public access
- Limited data
Pocumcus Lake in Washington County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Water clarity: 27.9 ft visibility. Phosphorus: 4 µg/L. Chlorophyll-a (algae): 2 µg/L.
Pocumcus Lake is a cold, clear oligotrophic lake in Washington County, Maine. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 10 other monitored lakes in Washington County, Pocumcus Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-27. Methodology: how these readings are compared.
What Pocumcus Lake is good for
From access and monitoring records, not editorial picks.
- Clear water27.9 ft of visibility
Swimming conditions
Readings onlyLimited data
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.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Pocumcus Lake is safe to swim in today is a call for the Maine Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Pocumcus Lake
These are the measurements Maine DEP publishes for Pocumcus Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 27.9 ft down. Phosphorus 4 µg/L. Chlorophyll-a 2 µg/L. TSI 30.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 27.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 4µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 30 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Pocumcus Lake
Answers come straight from the public measurements and survey records on this page.
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Fishing Pocumcus Lake
Water quality readings over time
3 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening3 years
Phosphorus
Stable0 µg/L/yr3 years
Chlorophyll-a
Stable0 µg/L/yr3 years
Nearby Lakes in Washington County
Frequently asked questions about Pocumcus Lake
Where is Pocumcus Lake?
- Pocumcus Lake is a lake in Washington County, Maine. Its water-quality measurements are published by Maine DEP and shown on this page as reported.
What is the water quality of Pocumcus Lake?
- Pocumcus Lake in Washington County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Water clarity: 27.9 ft visibility. Phosphorus: 4 µg/L. Chlorophyll-a (algae): 2 µg/L.
Is Pocumcus Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Pocumcus Lake?
- Public access to Pocumcus Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Maine's fish and wildlife agency, so check its current regulations before you go.
Explore Pocumcus Lake across LakeQuality
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Where this data comes from
28 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples28 samples · 2020–2022
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.