Tiffin R Lake
Defiance County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for Tiffin R Lake. Here is what has been measured.
- Mesotrophic
- Limited data
Tiffin R Lake in Defiance County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 103.3 µg/L. Chlorophyll-a (algae): 4.8 µg/L.
Tiffin R Lake is a mesotrophic lake in Defiance County, Ohio. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Tiffin R Lake is safe to swim in today is a call for the Ohio Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Tiffin R Lake
These are the measurements Ohio EPA publishes for Tiffin R Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 103.3 µg/L. Chlorophyll-a 4.8 µg/L. TSI 59.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 103µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 4.8µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 59 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Nearby Lakes in Defiance County
Frequently asked questions about Tiffin R Lake
Where is Tiffin R Lake?
- Tiffin R Lake is a lake in Defiance County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Tiffin R Lake?
- Tiffin R Lake in Defiance County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 103.3 µg/L. Chlorophyll-a (algae): 4.8 µg/L.
Is Tiffin R Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Tiffin R Lake across LakeQuality
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Other Lakes in Ohio
Mesotrophic Lakes in Ohio
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.