Lea Lake Overflow
Chaves County, New MexicoView 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 · Nutrients (phosphorus, nitrogen)
- Limited data
Lea Lake Overflow in Chaves County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 12 µg/L.
- Phosphorus
- 12 µg/L
- Trend
- ↓ Declining
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Watch Lea Lake Overflow’s letter
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Why Lea Lake Overflow 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 Lea Lake Overflow, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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 NMED and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lea Lake Overflow is a lake in Chaves County, New Mexico. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, NMED, last sampled 2022-04-14. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Lea Lake Overflow is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Lea Lake Overflow
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 12 µg/L. TSI 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 12 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Lea Lake Overflow
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.069 m/yr | 2 |
EPA Impairment Status
Lea Lake Overflow 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 NM-9000.B_044 · Official waterbody report · Matched by proximity (2.03 km)
Nearby Lakes in Chaves County
Frequently asked questions about Lea Lake Overflow
Where is Lea Lake Overflow?
- Lea Lake Overflow is a lake in Chaves County, New Mexico. 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 Lea Lake Overflow?
- Lea Lake Overflow in Chaves County, New Mexico is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 12 µg/L.
Is Lea Lake Overflow safe to swim in?
- The letter is not a swimming clearance. Lea Lake Overflow is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
2 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- NM Environmental Dept./SWQB
21NMEX_WQX2 samples · 2021–2022
Analytical methods
- Phosphorus by Colorimetry
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