Nla Lake is a highly nutrient-loaded hypereutrophic lake in San Juan County, Washington. Water quality is graded D based on 3 sampling years through 2012.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2012-09-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6.1 ft. Phosphorus level: 57500 µg/L. Chlorophyll-a: 7.1 µg/L. Trophic State Index: 88.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.1 ft | D |
| Phosphorus | 57500 µg/L | F |
| Chlorophyll-a (Algae) | 7.1 µg/L | B |
| Trophic State Index (TSI) | 88 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Location
County Ranking
Ranked #1 of 1 lakes in San Juan County
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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: 2012-09-19
Monitoring stations: 1