Hidden Lake
Maricopa County, ArizonaView mapDirections
ADEQ publishes the water-quality measurements for Hidden Lake. Here is what has been measured.
- Limited data
Hidden Lake in Maricopa County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Phosphorus: 90 µg/L.
Hidden Lake is a lake in Maricopa County, Arizona.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-07-28. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Hidden Lake is safe to swim in today is a call for the Arizona Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Hidden Lake
These are the measurements ADEQ publishes for Hidden Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 90 µg/L. TSI 69.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 90µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 69 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Hidden Lake
Where is Hidden Lake?
- Hidden Lake is a lake in Maricopa County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Hidden Lake?
- Hidden Lake in Maricopa County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Phosphorus: 90 µg/L.
Is Hidden Lake safe to swim in?
- Nutrient and algae readings are 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.