Waterbody profile
Official Water Board record · 2026 cycleEach row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.
| Pollutant / stressor | Decision ID | Final listing decision | Decision status | TMDL requirement status | TMDL project | TMDL priority |
|---|---|---|---|---|---|---|
| Cyanobacteria hepatotoxic microcystinsOther Cause | 74950 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | 5B — Addressed by USEPA-approved TMDL | Klamath River Nutrients, Temperature, DO, and Microcystin. | — |
| MicrocystinsOther Cause | 161485 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | 5B — Addressed by USEPA-approved TMDL | Klamath River Nutrients, Temperature, DO, and Microcystin. | — |
| NutrientsNutrients | 168856 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | 5B — Addressed by USEPA-approved TMDL | Klamath River Nutrients, Temperature, DO, and Microcystin. | — |
| Organic Enrichment/Low Dissolved OxygenNutrients | 71996 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Original | 5B — Addressed by USEPA-approved TMDL | Klamath River Nutrients, Temperature, DO, and Microcystin. | — |
| Temperature, waterOther Cause | 155233 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | 5B — Addressed by USEPA-approved TMDL | Klamath River Nutrients, Temperature, DO, and Microcystin. | — |
Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.
Industrial stormwater facilities geographically associated with this waterbody. These are derived spatial associations, not Water Board findings.
Grass Lake · Notice of Intent
Derived by California Stormwater Intelligence
Facility records are official Industrial General Permit registrations, but the association between a facility and this waterbody is derived geographically (proximity or shared HUC12 subwatershed) and is not a Water Board receiving-water determination. Where a permit carries a Water Board-stated TMDL requirement naming this water, it is listed separately above.