Impoundment Lake
Bexar County, TexasView 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
Impoundment Lake in Bexar County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 37.2 µg/L.
- Phosphorus
- 50 µg/L
- Chlorophyll-a
- 37.2 µg/L
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Watch Impoundment Lake’s letter
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Why Impoundment 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 Impoundment Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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.
Impoundment Lake is a lake in Bexar County, Texas.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2022-04-12. 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 Impoundment Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 50 µg/L. Chlorophyll-a 37.2 µg/L. TSI 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 50 µg/L | Not graded |
| Chlorophyll-a (Algae) | 37.2 µg/L | Not graded |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Impoundment Lake
Graded lakes near Impoundment Lake
Impoundment Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Bexar County
Frequently asked questions about Impoundment Lake
Where is Impoundment Lake?
- Impoundment Lake is a lake in Bexar County, Texas. 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 Impoundment Lake?
- Impoundment Lake in Bexar County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 37.2 µg/L.
Is Impoundment Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Impoundment Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN5 samples · 2021–2022
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.