Updated August 2026
The State of Pennsylvania's Lakes 2026
Of 4 lakes in Pennsylvania, 0% sit in EPA's favourable condition classes for nutrients and algae and 0% in its poorer ones. 3 lakes (75%) are on an official impaired-waters list.
Data Report
4
Monitored lakes sampled
F
Average readings
0%
low nutrient and algae readings
75%
On impaired list
Pennsylvania nutrient and algae readings
Cleanest lakes in Pennsylvania
Cleanest combined nutrient and algae readings, 2026.
No qualifying lakes with sufficient data.
Highest measured algae
Highest measured chlorophyll-a (algae) concentration.
No qualifying lakes with sufficient data.
Trending lakes
Improving
- 1.Lake Wallenpaupack — Pike County
Impaired waters in Pennsylvania
3 lakes appear on the EPA/state 303(d) impaired-waters list (1 formally listed, 3 with a cleanup plan/TMDL).
Nutrients (phosphorus, nitrogen) · 2Mercury · 1Turbidity · 1
Explore Pennsylvania lakes
Readings combine total phosphorus, total nitrogen, chlorophyll-a, and turbidity from the EPA Water Quality Portal and state agencies. See the full methodology, the national State of America’s Lakes report, or all Pennsylvania lakes.
Cite this report: LakeQuality, “The State of Pennsylvania's Lakes 2026”.