Hidden 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
Hidden Lake in Maricopa County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 90 µg/L.
- Phosphorus
- 90 µg/L
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Stays near Hidden Lake
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Watch Hidden Lake’s letter
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Why Hidden 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 Hidden Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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.
Hidden Lake is a lake in Maricopa County, Arizona.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-07-28. 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 Hidden Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 90 µg/L. TSI 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 90 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Hidden Lake
Graded lakes near Hidden Lake
Hidden Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Maricopa County
Frequently asked questions about Hidden Lake
Where is Hidden Lake?
- Hidden 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 Hidden Lake?
- Hidden Lake in Maricopa County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 90 µg/L.
Is Hidden Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
3 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Arizona Water Science Center
USGS-AZ3 samples · 2020–2022
Analytical methods
- Phosphorus, wu, microKJ ASF, H+
- HACH, sensor model 2100 AN, R-On
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.