Red Mountain Lake
Maricopa County, ArizonaView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Red Mountain Lake in Maricopa County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
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Stays near Red Mountain Lake
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Watch Red Mountain Lake’s letter
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Why Red Mountain Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Red Mountain Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Red Mountain Lake is a lake in Maricopa County, Arizona.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-04-09. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Red Mountain Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing Red Mountain Lake
Graded lakes near Red Mountain Lake
Red Mountain Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Maricopa County
Frequently asked questions about Red Mountain Lake
Where is Red Mountain Lake?
- Red Mountain Lake is a lake in Maricopa County, Arizona. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Red Mountain Lake?
- Red Mountain Lake in Maricopa County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Red Mountain Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Red Mountain Lake across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC3 samples · 2026
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.