Canyon Lake Headwaters
Comal 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.
- Impaired · Mercury
- Public access
- Limited data
Canyon Lake Headwaters in Comal County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.6 ft visibility. Chlorophyll-a (algae): 2.3 µg/L.
- Clarity
- 4.6 ft
- Chlorophyll-a
- 2.3 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Canyon Lake Headwaters’s letter
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Why Canyon Lake Headwaters 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 Canyon Lake Headwaters, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
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.
Canyon Lake Headwaters is a lake in Comal County, Texas. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2026-04-01. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Canyon Lake Headwaters is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Water quality measurements for Canyon Lake Headwaters
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.6 ft. Chlorophyll-a 2.3 µg/L. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 2.3 µg/L | Not graded |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Canyon Lake Headwaters
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.8 m/yr | 2 |
EPA Impairment Status
Canyon Lake Headwaters is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit TX-1805_03 · Official waterbody report · Matched by proximity (1.12 km)
Graded lakes near Canyon Lake Headwaters
Canyon Lake Headwaters has no grade, but these lakes within a short drive do.
Nearby Lakes in Comal County
Frequently asked questions about Canyon Lake Headwaters
Where is Canyon Lake Headwaters?
- Canyon Lake Headwaters is a lake in Comal 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 Canyon Lake Headwaters?
- Canyon Lake Headwaters in Comal County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.6 ft visibility. Chlorophyll-a (algae): 2.3 µg/L.
Is Canyon Lake Headwaters safe to swim in?
- The letter is not a swimming clearance. Canyon Lake Headwaters is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Explore Canyon Lake Headwaters across LakeQuality
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Where this data comes from
15 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN15 samples · 2020–2026
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database