Lewey Lake
Lewey Lake in Washington County, Maine has a water quality grade of A (Excellent). Water clarity: 15 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 3 µg/L.
- Clarity
- 15 ft
- Type
- Mesotrophic
- Trend
- ↑ Improving
Lewey Lake is a mesotrophic lake in Washington County, Maine. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 10 other monitored lakes in Washington County, Lewey Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-25. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Crystal clear, you can see 15 ft down. Phosphorus level: 9 µg/L. Chlorophyll-a: 3 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15 ft | Not graded |
| Phosphorus | 9 µg/L | Good |
| Chlorophyll-a (Algae) | 3 µg/L | Good |
| Trophic State Index (TSI) | 38 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lewey Lake
Compare lakeside cabins, hotels, and vacation rentals near Lewey Lake in Washington County, Maine — 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 Lewey Lake
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Fishing Lewey Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.061 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.29 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.07 µg/L/yr | 6 |
County Ranking
Ranked #6 of 11 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Lewey Lake
What is the water quality grade for Lewey Lake?
- Lewey Lake in Washington County, Maine has a water quality grade of A (Excellent). Water clarity: 15 ft visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 3 µg/L.
Is Lewey Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Lewey Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 3 µg/L. Always check local health department advisories before swimming.
Explore Lewey Lake across LakeGrade
More Maine Lake Rankings
Other Grade A Lakes in Maine
Mesotrophic Lakes in Maine
Where this data comes from
93 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples93 samples · 2020–2025
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: 2025-09-25
Monitoring stations: 1