San Luis Rey WWTP
Active WDID 9 37I005757 Oceanside, San Diego County Region 9 · San Diego
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Oceanside, San Diego County
- Region 9 · San Diego · Location · Statewide map
- Receiving water
- San Luis Rey via Pilgrim Creek (as reported by the facility)
- Evidence: not confirmed 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
- 723 distinct results, 9 reporting years (2016 to 2025)
- Most recent sample Feb 16, 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
- 33.24, -117.32
- Precision
- 2 decimal places low precision
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 3950 N River Rd, Oceanside 92054
- Regional Water Board
- 9 — San Diego
HUC12 watershed Evidence: spatial
- Guajome Lake-San Luis Rey River HUC12 180703030304
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
- San Luis Rey WWTP
- Primary industry (SIC)
- 4952-Sewerage Systems
- Application ID
- 218338
- NOI processed
- Apr 07, 1992
- Last certified
- Nov 26, 2019
- Facility size
- 94.48 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 218338 | Industrial | Active | Apr 07, 1992 | — | Nov 26, 2019 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Luis Rey via Pilgrim Creek
- Discharges directly / indirectly
- Y / N (as answered in the permit application)
Evidence: not confirmed Not matchable to a single waterbody
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
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 |
|---|---|---|---|
| San Luis Rey River, Lower (west of Interstate 15) CAR9031100020011005104327 | 45 m | listed | 9 |
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.
723 distinct measurements across 14 parameters, most recent sample Feb 16, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 143 | 13 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 52 | 13 | 0 | Feb 07, 2025 | Feb 12, 2025 |
| 2023 | 104 | 13 | 0 | Jan 03, 2024 | Feb 20, 2024 |
| 2022 | 250 | 14 | 0 | Sep 09, 2022 | Jan 30, 2023 |
| 2021 | 72 | 12 | 0 | Oct 25, 2021 | Dec 14, 2021 |
| 2020 | 24 | 3 | 0 | Nov 07, 2020 | Jan 29, 2021 |
| 2019 | 24 | 3 | 0 | Nov 20, 2019 | Mar 10, 2020 |
| 2018 | 30 | 3 | 0 | Nov 29, 2018 | Mar 06, 2019 |
| 2016 | 24 | 3 | 0 | Sep 20, 2016 | Jan 09, 2017 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 82 | 52 | Sep 20, 2016 | Feb 16, 2026 | Results |
| pH | SU | 82 | 0 | Sep 20, 2016 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 82 | 0 | Sep 20, 2016 | Feb 16, 2026 | Results |
| Chloride | mg/L | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Enterococci MPN | MPN/100 mL | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Fecal Coliform | MPN/100 mL | 48 | 1 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Nitrate, Total (as N) | mg/L | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 48 | 1 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Nitrite, Total (as N) | mg/L | 48 | 39 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Nitrogen, Total (as N) | mg/L | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Phosphorus, Total (as P) | mg/L | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
| Total Coliform | MPN/100 mL | 48 | 0 | Oct 25, 2021 | Feb 16, 2026 | Results |
Show 2 more parameters
All results (723 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Chloride | 2.6 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Chloride | 2.4 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Chloride | 8.1 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Enterococci MPN | 1000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1370842 | |
| Feb 16, 2026 | Enterococci MPN | 1180 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1370842 | |
| Feb 16, 2026 | Enterococci MPN | 3740 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1370842 | |
| Feb 16, 2026 | Fecal Coliform | 37 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1370842 | |
| Feb 16, 2026 | Fecal Coliform | 54000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1370842 | |
| Feb 16, 2026 | Fecal Coliform | 490 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1370842 | |
| Feb 16, 2026 | Nitrate, Total (as N) | .32 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrate, Total (as N) | .18 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrate, Total (as N) | .36 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .32 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1370842 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .22 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1370842 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | .41 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1370842 | |
| Feb 16, 2026 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1370842 | |
| Feb 16, 2026 | Nitrogen, Total (as N) | .81 | mg/L | Effluent | Qualifying Storm Event | E351.2 | 1370842 | |
| Feb 16, 2026 | Nitrogen, Total (as N) | 1.2 | mg/L | Effluent | Qualifying Storm Event | E351.2 | 1370842 | |
| Feb 16, 2026 | Nitrogen, Total (as N) | 1.9 | mg/L | Effluent | Qualifying Storm Event | E351.2 | 1370842 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370842 | |
| Feb 16, 2026 | Oil and Grease | 2.3 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370842 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370842 | |
| Feb 16, 2026 | pH | 7.41 | SU | Effluent | Qualifying Storm Event | A4500HB | 1370842 | |
| Feb 16, 2026 | pH | 5.87 | SU | Effluent | Qualifying Storm Event | A4500HB | 1370842 | |
| Feb 16, 2026 | pH | 6.28 | SU | Effluent | Qualifying Storm Event | A4500HB | 1370842 | |
| Feb 16, 2026 | Phosphorus, Total (as P) | .15 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370842 | |
| Feb 16, 2026 | Phosphorus, Total (as P) | .24 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370842 | |
| Feb 16, 2026 | Phosphorus, Total (as P) | .44 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370842 | |
| Feb 16, 2026 | Total Coliform | 9200 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221B | 1370842 | |
| Feb 16, 2026 | Total Coliform | 92000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221B | 1370842 | |
| Feb 16, 2026 | Total Coliform | 35000 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221B | 1370842 | |
| Feb 16, 2026 | Total Dissolved Solids (TDS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540C | 1370842 | |
| Feb 16, 2026 | Total Dissolved Solids (TDS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540C | 1370842 | |
| Feb 16, 2026 | Total Dissolved Solids (TDS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540C | 1370842 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 91.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370842 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 79.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370842 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 36.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370842 | |
| Feb 11, 2026 | Chloride | 1.6 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365825 | |
| Feb 11, 2026 | Chloride | 1.6 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365825 | |
| Feb 11, 2026 | Chloride | 7.2 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365825 | |
| Feb 11, 2026 | Enterococci MPN | 1440 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1365825 | |
| Feb 11, 2026 | Enterococci MPN | 550 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1365825 | |
| Feb 11, 2026 | Enterococci MPN | 1920 | MPN/100 mL | Effluent | Qualifying Storm Event | A9230C | 1365825 | |
| Feb 11, 2026 | Fecal Coliform | ND | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1365825 | |
| Feb 11, 2026 | Fecal Coliform | 330 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1365825 | |
| Feb 11, 2026 | Fecal Coliform | 20 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221CE | 1365825 | |
| Feb 11, 2026 | Nitrate, Total (as N) | .2 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365825 | |
| Feb 11, 2026 | Nitrate, Total (as N) | .16 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1365825 |
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 | Feb 09, 2018 – Feb 09, 2018 | Oct 21, 2026 | All inspections |
| Annual reports | 11 | certified reports (contents not shown) | 2015 – 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 (12 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 13, 2026 | Annual reports | 1337378 | Annual report 2025 | — | |
| Jun 27, 2025 | Annual reports | 1296293 | Annual report 2024 | — | |
| Jul 12, 2024 | Annual reports | 1245495 | Annual report 2023 | — | |
| Jul 07, 2023 | Annual reports | 1191606 | Annual report 2022 | — | |
| Jul 10, 2022 | Annual reports | 1115187 | Annual report 2021 | — | |
| Jul 12, 2021 | Annual reports | 1063281 | Annual report 2020 | — | |
| Jul 10, 2020 | Annual reports | 980163 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 956419 | Annual report 2018 | — | |
| Jun 21, 2018 | Annual reports | 941846 | Annual report 2017 | — | |
| Feb 09, 2018 | Inspections | 2036512 | B Type compliance | — | Follow-up Inspection Needed |
| Jul 25, 2017 | Annual reports | 881251 | Annual report 2016 | — | |
| Jul 06, 2016 | Annual reports | 841489 | Annual report 2015 | — |
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.