Nla Lake is a highly nutrient-loaded hypereutrophic lake in Mason County, Washington. Water quality is graded C based on 2 sampling years through 2017. Compared to the 1 other monitored lakes in Mason County, Nla Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2017-08-31. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 12509.4 µg/L. Chlorophyll-a: 1.7 µg/L. Trophic State Index: 88.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 12509.4 µg/L | F |
| Chlorophyll-a (Algae) | 1.7 µg/L | A |
| Trophic State Index (TSI) | 88 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Nla Lake
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Fishing Nla Lake
Location
County Ranking
Ranked #2 of 2 lakes in Mason County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade C. 4 nearby lakes hold higher grades.
- ALake: Summit LakeThurston County · 28.9 mi · Two grade letters higher (C → A)
- ANla LakeMason County · 11.9 mi · Two grade letters higher (C → A)
- BNla LakeKitsap County · 18.6 mi · Higher grade (C → B)
- CNla LakePierce County · 24.9 mi · Higher overall water quality score
Nearby Lakes in Mason County
Explore Nla Lake across LakeGrade
More Washington Lake Rankings
Other Grade C 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: 2017-08-31
Monitoring stations: 1