Giltners Lake
Giltners Lake in Fond du Lac County, Wisconsin has a water quality grade of D (Nutrient-rich). Phosphorus: 171 µg/L. Maximum depth: 13 ft. Surface area: 16 acres.
- Max depth
- 13 ft
- Area
- 16 acres
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Giltners Lake →
Next lake in Fond du Lac County
Giltners Lake is a 16-acre highly nutrient-loaded hypereutrophic lake in Fond du Lac County, Wisconsin with a maximum depth of 13 feet. Water quality is graded D based on 1 sampling years through 2026. Overall water quality is declining over recent sampling years. The lake supports 2 documented fish species including Panfish and Northern Pike. Compared to the 8 other monitored lakes in Fond du Lac County, Giltners Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 171 µg/L. Trophic State Index: 78.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 171 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 78 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Giltners Lake
Compare lakeside cabins, hotels, and vacation rentals near Giltners Lake in Fond du Lac County, Wisconsin — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Giltners Lake are listed below.
Top-rated places to stay near Giltners Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 13 ft |
| Surface Area | 16 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Giltners Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.425 m/yr | 4 |
| Phosphorus | ↓ Declining | +14 µg/L/yr | 3 |
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Giltners Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Mount Calvary WwtfMount Calvary · 2.8 mi away · NPDES WI0035963Recent violation
- J & J Pickart Dairy LlcMarshfield · 3 mi away · NPDES WI0066591Recent violation
- Ziegelbauer Septic ServiceMarshfield · 2.3 mi away · NPDES WI0036382
- Lake Breeze Dairy LlcMalone · 4.2 mi away · NPDES WI0062499
- Lake Breeze Dairy LlcCalumet, Town Of · 4.8 mi away · NPDES WI0066028
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.
County Ranking
Ranked #9 of 9 lakes in Fond du Lac County
Nearby Lakes With Higher Grades
Giltners Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Fond du Lac County
Frequently asked questions about Giltners Lake
What is the water quality grade for Giltners Lake?
- Giltners Lake in Fond du Lac County, Wisconsin has a water quality grade of D (Nutrient-rich). Phosphorus: 171 µg/L. Maximum depth: 13 ft. Surface area: 16 acres.
Is Giltners Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Giltners Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
How deep is Giltners Lake?
- Giltners Lake has a maximum depth of 13 feet. The lake covers 16 acres.
What fish are in Giltners Lake?
- Fish species found in Giltners Lake include Panfish, Northern Pike. Giltners Lake is located in Fond du Lac County, Wisconsin.
Explore Giltners Lake across LakeGrade
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Species activity outlook by water temperature and season
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Very high nutrients, dense algae, poor clarity
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Where this data comes from
8 measurements from 1 monitoring station, 2024–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX8 samples · 2024–2026
Analytical methods
- Total Phosphorus After Block Digestion
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes