Serrano Creek Ranch
Active WDID 8 30I029186 Lake Forest, Orange County Region 8 · Santa Ana
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Lake Forest, Orange County
- Region 8 · Santa Ana · Location · Statewide map
- Receiving water
- San Diego Creek (as reported by the facility)
- Evidence: candidate, awaiting review Details
- Identified receiving water on the 2026 303(d) list
- Not established
- Shown only when the reported receiving water is identified and corroborated.
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- 1 waterbody; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 202 distinct results, 5 reporting years (2021 to 2025)
- Most recent sample Feb 19, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 0 violation records · 0 enforcement actions
- Counts as published in SMARTS; not a compliance determination · Details
Each label shows where a statement comes from. How to read the labels.
Overview and location
Reported facility location HUC12 watershed Corroborated receiving water 2026 Integrated Report waterbodies nearby
Reported location Evidence: facility-reported
- Coordinates
- 33.64831, -117.68835
- Precision
- 5 decimal places
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 25200 TRABUCO ROAD, Lake Forest 92630
- Regional Water Board
- 8 — Santa Ana
HUC12 watershed Evidence: spatial
- Upper San Diego Creek HUC12 180702040102
The facility's reported location lies within this HUC12 watershed (spatial derivation); it is not a discharge location.
Permits and applications Evidence: SMARTS record
Current permit record
- Permit type
- Industrial
- Application type
- Notice of Intent (WDID code I)
- Status
- Active
- Operator
- Lake Forest Equestrian Center
- Primary industry (SIC)
- 0272-Horses and Other Equines
- Secondary SIC
- 9999-Nonclassifiable Establishments
- Application ID
- 531989
- NOI processed
- Apr 22, 2021
- Last certified
- Apr 20, 2021
- Facility size
- 339768 SqFt
- Impervious area
- 22.2 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 531989 | Industrial | Active | Apr 22, 2021 | — | Apr 20, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Diego Creek
- Discharges directly / indirectly
- Y / N (as answered in the permit application)
Evidence: not confirmed Evidence: candidate, awaiting review Awaiting review
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
Why it is not confirmed (1)
- C1 name is only a prefix of official names
2 official waterbodies share this name; none is assigned without review.
Impaired waters and TMDLs
Two kinds of information, kept apart: 2026 Integrated Report waterbodies near the reported location (geographic proximity only), and TMDL records that SMARTS lists for this facility. Neither establishes where the facility discharges; see Receiving water for the facility's own statement.
Nearby waterbodies Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near a waterbody does not mean the facility discharges to it.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Serrano Creek CAR8011100020080921203908 | 121 m | listed | 5 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
No TMDL records for this facility in the SMARTS TMDL export.
Reported monitoring results Evidence: facility-reported
Numeric Action Level (NAL) screening is being independently validated and is not shown. Nothing on this page states whether a result exceeded a NAL.
202 distinct measurements across 9 parameters, most recent sample Feb 19, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 32 | 8 | 0 | Dec 24, 2025 | Feb 19, 2026 |
| 2024 | 24 | 9 | 0 | Feb 07, 2025 | Mar 13, 2025 |
| 2023 | 56 | 8 | 0 | Dec 22, 2023 | Apr 05, 2024 |
| 2022 | 57 | 9 | 0 | Nov 08, 2022 | May 04, 2023 |
| 2021 | 33 | 9 | 0 | Oct 08, 2021 | Dec 30, 2021 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Fecal Coliform | MPN/100 mL | 26 | 1 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Ammonia, Total (as N) | mg/L | 25 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Nitrogen, Total (as N) | mg/L | 25 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Oil and Grease | mg/L | 25 | 10 | Oct 08, 2021 | Feb 19, 2026 | Results |
| pH | SU | 25 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Phosphorus, Total (as P) | mg/L | 25 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 25 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | mg/L | 23 | 0 | Oct 08, 2021 | Feb 19, 2026 | Results |
| Soluble Biochemical Oxygen Demand (5-day @ 20 Deg. C) | mg/L | 3 | 0 | Dec 30, 2021 | Feb 13, 2025 | Results |
All results (202 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | Ammonia, Total (as N) | 1.5 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1369722 | |
| Feb 19, 2026 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 30 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1369722 | |
| Feb 19, 2026 | Fecal Coliform | 13000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1369722 | |
| Feb 19, 2026 | Nitrogen, Total (as N) | 1.9 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1369722 | |
| Feb 19, 2026 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369722 | |
| Feb 19, 2026 | pH | 8.11 | SU | Effluent | Qualifying Storm Event | pH_Field | 1369722 | |
| Feb 19, 2026 | Phosphorus, Total (as P) | 2 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1369722 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 170 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369722 | |
| Feb 11, 2026 | Ammonia, Total (as N) | .85 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1369726 | |
| Feb 11, 2026 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 12 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1369726 | |
| Feb 11, 2026 | Fecal Coliform | 54000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1369726 | |
| Feb 11, 2026 | Nitrogen, Total (as N) | 3.3 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1369726 | |
| Feb 11, 2026 | Oil and Grease | 4.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369726 | |
| Feb 11, 2026 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1369726 | |
| Feb 11, 2026 | Phosphorus, Total (as P) | 1.5 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1369726 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 190 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369726 | |
| Dec 26, 2025 | Ammonia, Total (as N) | 1 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1364290 | |
| Dec 26, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 28 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1364290 | |
| Dec 26, 2025 | Fecal Coliform | 160000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1364290 | |
| Dec 26, 2025 | Nitrogen, Total (as N) | 3.5 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1364290 | |
| Dec 26, 2025 | Oil and Grease | 3.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364290 | |
| Dec 26, 2025 | pH | 8.12 | SU | Effluent | Qualifying Storm Event | pH_Field | 1364290 | |
| Dec 26, 2025 | Phosphorus, Total (as P) | 2 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1364290 | |
| Dec 26, 2025 | Total Suspended Solids (TSS) | 360 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364290 | |
| Dec 24, 2025 | Ammonia, Total (as N) | .12 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1364283 | |
| Dec 24, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 23 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1364283 | |
| Dec 24, 2025 | Fecal Coliform | 160000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1364283 | |
| Dec 24, 2025 | Nitrogen, Total (as N) | 3.6 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1364283 | |
| Dec 24, 2025 | Oil and Grease | 4.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364283 | |
| Dec 24, 2025 | pH | 8.22 | SU | Effluent | Qualifying Storm Event | pH_Field | 1364283 | |
| Dec 24, 2025 | Phosphorus, Total (as P) | 2.9 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1364283 | |
| Dec 24, 2025 | Total Suspended Solids (TSS) | 460 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364283 | |
| Mar 13, 2025 | Ammonia, Total (as N) | .98 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1329781 | |
| Mar 13, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 9.8 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1329781 | |
| Mar 13, 2025 | Fecal Coliform | 7900 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1329781 | |
| Mar 13, 2025 | Nitrogen, Total (as N) | 2.1 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1329781 | |
| Mar 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329781 | |
| Mar 13, 2025 | pH | 8.18 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329781 | |
| Mar 13, 2025 | Phosphorus, Total (as P) | 1.3 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1329781 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 140 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329781 | |
| Feb 13, 2025 | Ammonia, Total (as N) | 1.5 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1328348 | |
| Feb 13, 2025 | Fecal Coliform | 35000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1328348 | |
| Feb 13, 2025 | Nitrogen, Total (as N) | 2.9 | mg/L | Effluent | Qualifying Storm Event | A4500NB | 1328348 | |
| Feb 13, 2025 | Oil and Grease | 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328348 | |
| Feb 13, 2025 | pH | 8.31 | SU | Effluent | Qualifying Storm Event | pH_Field | 1328348 | |
| Feb 13, 2025 | Phosphorus, Total (as P) | 4.7 | mg/L | Effluent | Qualifying Storm Event | A4500PE | 1328348 | |
| Feb 13, 2025 | Soluble Biochemical Oxygen Demand (5-day @ 20 Deg. C) | 26 | mg/L | Effluent | Qualifying Storm Event | 1328348 | ||
| Feb 13, 2025 | Total Suspended Solids (TSS) | 880 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328348 | |
| Feb 07, 2025 | Ammonia, Total (as N) | 1.7 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1326489 | |
| Feb 07, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 23 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1326489 |
Results are shown exactly as reported by the discharger. Identical rows repeated in the State's export are shown once. Where the export contains different versions of the same sample and parameter, each version is listed and flagged. Details.
Compliance and enforcement records Evidence: SMARTS record
These are records as the State Water Board publishes them in SMARTS, with the source's own types and statuses. They are not a compliance determination or rating. A record listed here is not proof of a violation beyond what the source states, and the absence of records does not establish compliance.
| Record type | Records | As published | Dates | Retrieved | List |
|---|---|---|---|---|---|
| Violations | 0 | 0 Violation · 0 Potential (preliminary) · 0 Dismissed | — | Oct 21, 2026 | |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | Sep 22, 2026 – Sep 22, 2026 | Oct 21, 2026 | All inspections |
| Annual reports | 6 | certified reports (contents not shown) | 2020 – 2025 | Oct 21, 2026 | All reports |
| Water-quality-based corrective action reports | 0 | reports, by parameter | — | Oct 21, 2026 |
Each record type is counted by its own SMARTS identifier. A violation and the enforcement action that cites it are two records in two lists; they are never added together.
Chronological record history (7 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Sep 22, 2026 | Inspections | 2072104 | B Type compliance | Finalized | No Further Action |
| Jun 16, 2026 | Annual reports | 1340721 | Annual report 2025 | — | |
| Jul 02, 2025 | Annual reports | 1299874 | Annual report 2024 | — | |
| Jul 05, 2024 | Annual reports | 1249255 | Annual report 2023 | — | |
| Jun 20, 2023 | Annual reports | 1195564 | Annual report 2022 | — | |
| Jun 25, 2022 | Annual reports | 1157181 | Annual report 2021 | — | |
| Jul 08, 2021 | Annual reports | 1149200 | Annual report 2020 | — |
Sources and provenance
| Information | Source | Retrieved or published |
|---|---|---|
| Permit, location, receiving-water text | SMARTS Industrial Application Specific Data | Oct 20, 2026 |
| Permit history | SMARTS Storm Water Applications | Oct 20, 2026 |
| Monitoring results | SMARTS Industrial Parameter Data | Oct 20, 2026 |
| Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12) | USGS | 2026-10-22 |
| 2026 California Integrated Report, Appendix A: 2026 303(d) List (final) | SWRCB | 2026-10-22 |
| Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0) | SWRCB GIS | 2026-10-22 |
| SMARTS TMDL requirements | SMARTS | 2026-10-21 |
Relationships computed 2026-10-22 with methods facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1; proximity threshold 1.0 km.
How to read the evidence labels
- Evidence: SMARTS record Evidence: facility-reported Information as published in SMARTS or reported by the discharger.
- Evidence: identification corroborated The reported receiving-water name identifies one official waterbody and the facility's location is consistent with it. It does not establish a discharge pathway.
- Evidence: candidate, awaiting review Evidence: not confirmed The reported name could match one or more official waterbodies, but no identification has been confirmed; nothing is assigned without review.
- Evidence: spatial Evidence: geographic proximity Derived from the reported location only.
- Evidence: SMARTS-reported Source records whose links to official references are not yet reviewed.
- Evidence: unavailable The information could not be loaded or is not in the sources.
Records are shown as published and are not compliance determinations. How geographic context is derived.