Red Mountain Lake is a productive, nutrient-rich eutrophic lake in Maricopa County, Arizona. Water quality is graded C based on 1 sampling years through 2026. Compared to the 13 other monitored lakes in Maricopa County, Red Mountain Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Arizona DNR, last sampled 2026-04-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 2.5 ft of visibility. Phosphorus level: 38 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | 38 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Red Mountain Lake
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Fishing Red Mountain Lake
Location
County Ranking
Ranked #9 of 14 lakes in Maricopa County
Nearby Lakes in Maricopa County
Explore Red Mountain Lake across LakeGrade
More Arizona Lake Rankings
Other Grade C Lakes in Arizona
Eutrophic Lakes in Arizona
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: 2026-04-09
Monitoring stations: 1