Big Tank
Big Tank in Uvalde County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 207 acres.
- Area
- 207 acres
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Why Big Tank 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 Big Tank, no water-quality sampling on record for this lake.
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 TCEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Big Tank is a 207-acre lake in Uvalde County, Texas.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Big Tank water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Big Tank
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Big Tank
Compare lakeside cabins, hotels, and vacation rentals near Big Tank in Uvalde County, Texas — 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.
Top-rated places to stay near Big Tank
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 207 acres |
No bathymetric survey has been published for Big Tank, so its depth is not documented here.
Fishing Big Tank
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Frequently asked questions about Big Tank
Where is Big Tank?
- Big Tank is a lake in Uvalde County, Texas. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Big Tank?
- Big Tank in Uvalde County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 207 acres.
Is Big Tank safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Big Tank is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Big Tank come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.