Owl Tank Lake
Coconino 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
Owl Tank Lake in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
- Trend
- ↓ Declining
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Stays near Owl Tank Lake
Compare lakeside cabins, hotels, and vacation rentals near Owl Tank Lake in Coconino County, Arizona — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Watch Owl Tank Lake’s letter
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Why Owl Tank 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 Owl Tank 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.
Owl Tank Lake is a lake in Coconino County, Arizona. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled recent years. 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 Owl Tank 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 Owl Tank Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +13 µg/L/yr | 2 |
Nearby Lakes in Coconino County
Frequently asked questions about Owl Tank Lake
Where is Owl Tank Lake?
- Owl Tank Lake is a lake in Coconino 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 Owl Tank Lake?
- Owl Tank Lake in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Owl Tank Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Owl Tank Lake across LakeQuality
Planning a trip around Grand Canyon?
Owl Tank Lake is about 10 miles from Grand Canyon National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Grand Canyon →More Arizona Lake Rankings
Other Lakes in Arizona
Where this data comes from
Measurements for Owl Tank Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.