Lakemartha
Lakemartha in Polk County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility. Phosphorus: 18 µg/L.
- Clarity
- 5.2 ft
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Polk County
Swipe left or right on this bar to open the next or previous lake.
Why Lakemartha 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 Lakemartha, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not 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 FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lakemartha is a lake in Polk County, Florida. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-09-20. Grade methodology: LakeQuality methodology.
Watch Lakemartha water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lakemartha
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.2 ft. Phosphorus level: 18 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | Not graded |
| Phosphorus | 18 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lakemartha
Compare lakeside cabins, hotels, and vacation rentals near Lakemartha in Polk County, Florida — 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 Lakemartha
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Recreation & Access
- Lake Martha Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lakemartha
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.153 m/yr | 6 |
| Phosphorus | → Stable | -0.07 µg/L/yr | 6 |
EPA Impairment Status
Lakemartha 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 FL1488P · Official waterbody report · Matched by proximity (0.16 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lakemartha under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- Polk City, City OfPolk City · 0.2 mi away · NPDES FLS266752Major
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.
Nearby Lakes in Polk County
Frequently asked questions about Lakemartha
Where is Lakemartha?
- Lakemartha is a lake in Polk County, Florida. 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 Lakemartha?
- Lakemartha in Polk County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.2 ft visibility. Phosphorus: 18 µg/L.
Is Lakemartha safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lakemartha is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Lakemartha?
- Lakemartha has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Martha Public Boat Ramp. Public access is listed as yes.
Explore Lakemartha across LakeQuality
More Florida Lake Rankings
Other Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples2 samples · 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory