Is Delta Reservoir Polluted?
Yes — Delta Reservoir in Oneida County, New York is on the EPA's Clean Water Act 303(d) impaired-waters list (2022 assessment cycle). It is cited for Hydrologic alteration. "Impaired" is a legal designation, separate from the lake's EPA condition class water-quality readings: it means at least one designated use (such as swimming, aquatic life, or fish consumption) does not meet state standards for the listed pollutant.
EPA 303(d) Listing
| On 303(d) impaired list | Listed impaired |
| Cleanup plan (TMDL) | Not yet written |
| Assessment cycle | 2022 |
| EPA IR category | 4C |
| EPA names this lake in the listing | Yes |
| Location | Oneida County, New York |
Pollutants Cited
- Hydrologic alteration — listed by EPA as exceeding water-quality standards for at least one designated use.
What this means for using Delta Reservoir
Review the EPA assessment and any state advisories before relying on Delta Reservoir for swimming, fishing, or other uses. An impairment listing does not mean the lake is closed — most impaired lakes remain open for boating and swimming. It means a specific pollutant exceeds a standard for a specific use. See the full breakdown on the lake report. The official EPA assessment is available in the ATTAINS waterbody report.
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