16 ng/L maximum result used by DEC
This is the permit writer's existing-effluent input, not a future Micron discharge projection.
Technical brief ~ final permit issued April 10, 2026Oak Orchard PFAS
Measured record Permit response Not presented as verified
Oak Orchard PFAS
permit data.
The final permit separates numeric effluent limits, action levels, monitoring requirements and response obligations. Those categories are kept distinct here.
40PFAS compounds listed across the permit program
10 ng/LPFOA and PFOS action level at Outfall 001
QuarterlyGrab-sample frequency
1633/1633AEPA analytical method required
An action level is not a numeric effluent limit, but it is not consequence-free. A confirmed exceedance requires DEC notification, a minimization program and continuing reporting under the permit.
Final permit requirements.
| Parameter group | Permit entry | Sampling | Response |
|---|---|---|---|
| PFOA and PFOS at Outfall 001 | 10 ng/L action level; no numeric daily-maximum effluent limit shown | Quarterly grab sample | Confirmatory sample within seven days after an exceedance result; notify DEC after a confirmed exceedance; begin minimization and reporting |
| Other listed PFAS at Outfall 001 | Monitor | Quarterly grab sample | Data collection supports future standards or performance requirements |
| Industrial train Outfall 01B | PFAS monitoring table applies; PFOA and PFOS are monitor-only in the displayed final permit table | Quarterly grab sample | Permit monitoring and reporting |
| Reuse Outfalls 006 and 007 | Reuse flow monitoring begins after DEC accepts construction completion | Continuous flow meter | Comply with reuse-outfall conditions once activated |
PFOS data used in DEC's fact sheet.
DEC used a maximum reported Outfall 001 PFOS result of 16 ng/L in its reasonable-potential analysis. The agency concluded that the projected instream concentration did not show reasonable potential to cause or contribute to a water-quality violation after dilution, while retaining the 10 ng/L action level because PFOS was present.
10 ng/L action level
The threshold is based on the New York drinking-water maximum contaminant level as a proxy for background concentration in influent.
Third-party 1,136,000 ng/L projection
The advocacy calculation from the prior site is not carried into the current dashboard as a verified agency projection or permit limit.
Primary records.
Final SPDES permit
Permit NY0030317, effective May 1, 2026 through April 30, 2031.
Open permit ↗NYSDEC Micron dashboard
Current permit table for the campus and connected infrastructure.
Open dashboard ↗Machine-readable project data
Current infrastructure watchlist and evidence labels.
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