← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Otay Reservoir, Lower

Waterbody ID (WBID)
CAL9103100019991117155943
County / counties
San Diego
Regional Water Board
Regional Board 9 - San Diego Region
Waterbody type
Lake & Reservoir
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (8)

Each row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.

Pollutant / stressorDecision IDFinal listing decisionDecision statusTMDL requirement statusTMDL projectTMDL priority
AmmoniaNutrients68655List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
ColorNuisance68671Do Not Delist from 303(d) list (TMDL required list)Original5A TMDL still requiredLow
IronMetals68779List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
ManganeseMetals68723List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
MercuryMetals128236List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
NitrogenNutrients76828List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow
pHOther Cause106413Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
PhosphorusNutrients76576List on 303(d) list (TMDL required list)Original5A TMDL still requiredLow

Source & provenance

Agency
California State Water Resources Control Board
Report
Final 2026 California Integrated Report
Dataset
Appendix A — 2026 303(d) List of Impaired Waters
Imported
Sep 16, 2026, 10:57 PM UTC
Waterbody ID
CAL9103100019991117155943
CALWNUM
91031000
Geometry
Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

Location

Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.

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Watershed
Assessed size
1092.19 Acres

Derived facility associations

Industrial stormwater facilities geographically associated with this waterbody. These are derived spatial associations, not Water Board findings.

Derived

No industrial stormwater facility is geographically associated with this waterbody.

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.