Ak-Chin Reservoir
Pinal County, ArizonaView mapDirections
ADEQ publishes the water-quality measurements for Ak-Chin Reservoir. Here is what has been measured.
- Mesotrophic
Ak-Chin Reservoir in Pinal County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 4.2 µg/L.
Ak-Chin Reservoir is a mesotrophic lake in Pinal County, Arizona. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-04-28. Methodology: how these readings are compared.
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Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Ak-Chin Reservoir 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 Ak-Chin Reservoir
These are the measurements ADEQ publishes for Ak-Chin Reservoir, 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 27.5 µg/L. Chlorophyll-a 4.2 µg/L. TSI 48.
| 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 | 27.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4.2µg/L | Measured, not scored 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. | 48 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Fishing Ak-Chin Reservoir
Water Quality Trend: Improving
Based on 10 years of monitoring (2012–2025).
Phosphorus
Improving-0.8 µg/L/yr10 years
Chlorophyll-a
Improving-0.3 µg/L/yr2 years
Nearby Lakes in Pinal County
Frequently asked questions about Ak-Chin Reservoir
Where is Ak-Chin Reservoir?
- Ak-Chin Reservoir is a lake in Pinal County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Ak-Chin Reservoir?
- Ak-Chin Reservoir in Pinal County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 4.2 µg/L.
Is Ak-Chin Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Ak-Chin Reservoir across LakeQuality
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Where this data comes from
63 measurements from 1 monitoring station, 2012–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Ak-Chin Indian Community (Tribal)
AK-CHIN_WQX63 samples · 2012–2026
Analytical methods
- DO NOT USE***4500 NH3 C ~ Ammonia in Water by Titrimetric Method
- 4500 SO4 D ~ Sulfate in Water by Gravimetric Analysis
- Phosphorus by Two Reagent Colorimetry
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
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.