Lake Luna is a 17-acre highly nutrient-loaded hypereutrophic lake in Cass County, Missouri. Water quality is graded F based on 3 sampling years through 2021. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Cass County, Lake Luna ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-08-04. Grade methodology: LakeGrade methodology.
Watch Lake Luna water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.2 ft of visibility. Phosphorus level: 192.9 µg/L. Chlorophyll-a: 92.7 µg/L. Trophic State Index: 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | F |
| Phosphorus | 192.9 µg/L | F |
| Chlorophyll-a (Algae) | 92.7 µg/L | F |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 17 acres |
Where to stay near Lake Luna
Compare lakeside cabins, hotels, and vacation rentals near Lake Luna in Cass County, Missouri — 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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Fishing Lake Luna
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.08 m/yr | 2 |
| Phosphorus | ↑ Improving | -18 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -19.8 µg/L/yr | 2 |
Water Temperature
Lake Luna averages about 82°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in Jun (about 78°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 12 field readings (2019–2021) via the EPA Water Quality Portal. See the full Lake Luna water temperature breakdown →
Location
County Ranking
Ranked #5 of 5 lakes in Cass County
Cleaner Lakes Within 30 Miles
Lake Luna holds Grade F. 4 nearby lakes hold higher grades.
- FHarrisonville City LakeCass County · 0.4 mi · Higher overall water quality score
- FHarrisonville LakeCass County · 7.3 mi · Higher overall water quality score
- FRaintree LakeCass County · 12.1 mi · Higher overall water quality score
- FCoot LakeJackson County · 14.4 mi · Higher overall water quality score
Nearby Lakes in Cass County
Explore Lake Luna across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
Hypereutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Lake Luna is a man-made reservoir impounded by the Lake Luna Dam (completed 1920), built primarily for recreation on the TOWN CREEK; earth-type dam, 17 ft tall.
- Surface area
- 17 ac
- Normal storage
- 120 ac-ft
- Max storage
- 155 ac-ft
- Drainage area
- 1,310 sq mi
- Hazard class
- High
- Owner
- CITY OF HARRISONVILLE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO20076 · Operator website
EPA Impairment Status
Lake Luna is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7216.00 · Official waterbody report
Regulated Pollution Sources Nearby
11 EPA-permitted facilities operate within about 5 miles of Lake Luna under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 6 facilities have a reported Clean Water Act violation in the past three years.
- Harrisonville WwtpHarrisonville · 1.7 mi away · NPDES MO0028070MajorRecent violation
- Harrisonville Fireworks LpHarrisonville · 3.1 mi away · NPDES MO0123595Recent violation
- Grab And Go WwtpHarrisonville · 3.1 mi away · NPDES MO0117544Recent violation
- Slumber Inn WwtfHarrisonville · 3.1 mi away · NPDES MO0107301Recent violation
- Sapp Brothers Travel Center WwtpHarrisonville · 3.3 mi away · NPDES MO0138215Recent violation
- Harrisonville South WwtpHarrisonville · 3.8 mi away · NPDES MO0126179Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-08-04
Monitoring stations: 1