Tappan Lake @ Cadiz Public Water Supply Intake
Harrison County, OhioView mapDirections
This is the name Ohio EPA records for this water. It can describe one sampling location rather than the water as a whole.
Ohio EPA publishes the water-quality measurements for Tappan Lake @ Cadiz Public Water Supply Intake. Here is what has been measured.
- Limited data
Tappan Lake @ Cadiz Public Water Supply Intake in Harrison County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 66.1 µg/L. Chlorophyll-a (algae): 72.1 µg/L.
Tappan Lake @ Cadiz Public Water Supply Intake is a lake in Harrison County, Ohio. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2022-08-22. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Tappan Lake @ Cadiz Public Water Supply Intake 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.
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Water quality measurements for Tappan Lake @ Cadiz Public Water Supply Intake
These are the measurements Ohio EPA publishes for Tappan Lake @ Cadiz Public Water Supply Intake, 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 66.1 µg/L. Chlorophyll-a 72.1 µg/L. TSI 69.
| 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 | 66.1µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 72.1µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 69 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Tappan Lake @ Cadiz Public Water Supply Intake
Water quality readings over time
2 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Stable+1.35 µg/L/yr2 years
Nearby Lakes in Harrison County
Frequently asked questions about Tappan Lake @ Cadiz Public Water Supply Intake
Where is Tappan Lake @ Cadiz Public Water Supply Intake?
- Tappan Lake @ Cadiz Public Water Supply Intake is in Harrison County, Ohio. This is the name Ohio EPA records for this water. It can describe one sampling location rather than the water as a whole. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Tappan Lake @ Cadiz Public Water Supply Intake?
- Tappan Lake @ Cadiz Public Water Supply Intake in Harrison County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 66.1 µg/L. Chlorophyll-a (algae): 72.1 µg/L.
Is Tappan Lake @ Cadiz Public Water Supply Intake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
5 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_WQX5 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)
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.