Sandusky County, Ohio · Water Quality Report Card
Fremont Reservoir
Fremont Reservoir in Sandusky County, Ohio has a water quality grade of C (Fair). Phosphorus: 50.1 µg/L. Chlorophyll-a (algae): 9.5 µg/L.
- Type
- Eutrophic
Fremont Reservoir is a productive, nutrient-rich eutrophic lake in Sandusky County, Ohio. Water quality is graded C based on 2 sampling years through 2022.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2022-09-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 50.1 µg/L. Chlorophyll-a: 9.5 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 50.1 µg/L | Fair |
| Chlorophyll-a (Algae) | 9.5 µg/L | Good |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Fremont Reservoir
Location
County Ranking
Ranked #1 of 1 lakes in Sandusky County
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Explore Fremont Reservoir across LakeGrade
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More records, surveys & data sources
Where this data comes from
58 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX58 samples · 2022
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2022-09-26
Monitoring stations: 1