Lake: Pattison Lake is a productive, nutrient-rich eutrophic lake in Thurston County, Washington. Water quality is graded B based on 2 sampling years through 2025. Compared to the 18 other monitored lakes in Thurston County, Lake: Pattison Lake ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2025-11-13. Grade methodology: LakeGrade methodology.
Watch Lake: Pattison Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 26.5 µg/L. Chlorophyll-a: 10.5 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 26.5 µg/L | B |
| Chlorophyll-a (Algae) | 10.5 µg/L | C |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake: Pattison Lake
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Fishing Lake: Pattison Lake
Location
County Ranking
Ranked #13 of 19 lakes in Thurston County
Cleaner Lakes Within 30 Miles
Lake: Pattison Lake holds Grade B. 2 nearby lakes hold higher grades.
- ALake: Ward LakeThurston County · 4.5 mi · Higher grade (B → A)
- ALake: Hicks LakeThurston County · 2 mi · Higher grade (B → A)
Nearby Lakes in Thurston County
Explore Lake: Pattison Lake across LakeGrade
More Washington Lake Rankings
Other Grade B Lakes in Washington
Eutrophic Lakes in Washington
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-11-13
Monitoring stations: 2