Maricopa County, Arizona · 33.59°N · Water Quality Report Card
Apache Lake
Apache Lake in Maricopa County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
- Mean depth
- ~110 ft est.
- Trend
- → Stable
Apache Lake is a lake in Maricopa County, Arizona with an estimated average depth of about 110 feet. Water clarity is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2026-03-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~110 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Arizona has not published bathymetry for Apache Lake.
Where to stay near Apache Lake
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Fishing Apache Lake
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.62 m/yr | 2 |
| Phosphorus | ↓ Declining | +235 µg/L/yr | 2 |
Location
Nearby Lakes in Maricopa County
Explore Apache Lake across LakeGrade
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Other Lakes in Arizona
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
2 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- AZDEQ_SW
AZDEQ_SW2 samples · 2025–2026
Analytical methods
- SM 4500 PF
- SM 4500-P-F
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2026-03-04
Monitoring stations: 1