Defiance County, Ohio · Water Quality Report Card
Tiffin R Lake
Tiffin R Lake in Defiance County, Ohio has a water quality grade of C (Fair). Phosphorus: 103.3 µg/L. Chlorophyll-a (algae): 4.8 µg/L.
- Type
- Mesotrophic
Tiffin R Lake is a mesotrophic lake in Defiance County, Ohio. Water quality is graded C based on 2 sampling years through 2021. Compared to the 1 other monitored lakes in Defiance County, Tiffin R Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2021-09-15. 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: 103.3 µg/L. Chlorophyll-a: 4.8 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 103.3 µg/L | Poor |
| Chlorophyll-a (Algae) | 4.8 µg/L | Good |
| Trophic State Index (TSI) | 59 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Tiffin R Lake
Location
County Ranking
Ranked #1 of 2 lakes in Defiance County
Nearby Lakes in Defiance County
Explore Tiffin R Lake across LakeGrade
More Ohio Lake Rankings
Other Grade C Lakes in Ohio
Mesotrophic Lakes in Ohio
More records, surveys & data sources
Where this data comes from
18 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX18 samples · 2021
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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: 2021-09-15
Monitoring stations: 1