San Luis Obispo Cnty Mc Chesne
Active WDID 3 40I002529 San Luis Obispo, San Luis Obispo County Region 3 · Central Coast
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- San Luis Obispo, San Luis Obispo County
- Region 3 · Central Coast · Location · Statewide map
- Receiving water
- San Luis Obispo 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
- None
- Monitoring results Evidence: facility-reported
- 242 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 2 violation records · 1 enforcement action
- 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
- 35.23983, -120.64023
- 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
- 903 Airport Dr Ste 5, San Luis Obispo 93401
- Regional Water Board
- 3 — Central Coast
HUC12 watershed Evidence: spatial
- Lower San Luis Obispo Creek HUC12 180600060702
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 Obispo County Regional Airport
- Primary industry (SIC)
- 4581-Airports, Flying Fields, and Airport Terminal Services
- Application ID
- 185692
- NOI processed
- Mar 31, 1992
- Last certified
- Apr 08, 2021
- Facility size
- 340 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 185692 | Industrial | Active | Mar 31, 1992 | — | Apr 08, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Luis Obispo Creek
- Discharges directly / indirectly
- N / Y (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
3 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.
No 2026 Integrated Report waterbody lies within the proximity threshold of the reported location.
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.
242 distinct measurements across 6 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 | 16 | 4 | 0 | Nov 20, 2025 | Feb 16, 2026 |
| 2024 | 16 | 4 | 0 | Dec 12, 2024 | Dec 14, 2024 |
| 2023 | 16 | 4 | 0 | Dec 18, 2023 | Jan 03, 2024 |
| 2022 | 20 | 5 | 0 | Nov 08, 2022 | Dec 27, 2022 |
| 2021 | 19 | 5 | 0 | Nov 09, 2021 | Dec 13, 2021 |
| 2020 | 20 | 5 | 0 | Dec 28, 2020 | Jan 27, 2021 |
| 2019 | 20 | 5 | 0 | Dec 04, 2019 | Dec 04, 2019 |
| 2018 | 20 | 5 | 0 | Nov 29, 2018 | Nov 29, 2018 |
| 2017 | 20 | 5 | 0 | Jan 09, 2018 | Jan 09, 2018 |
| 2016 | 40 | 5 | 0 | Oct 28, 2016 | Jan 04, 2017 |
| 2015 | 35 | 6 | 0 | Dec 11, 2015 | Mar 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Chemical Oxygen Demand (COD) | mg/L | 51 | 12 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 51 | 37 | Dec 11, 2015 | Feb 16, 2026 | Results |
| pH | SU | 51 | 0 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 51 | 7 | Dec 11, 2015 | Feb 16, 2026 | Results |
| Ammonia, Total (as N) | mg/L | 37 | 23 | Dec 11, 2015 | Dec 27, 2022 | Results |
| Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | mg/L | 1 | 0 | Dec 11, 2015 | Dec 11, 2015 | Results |
All results (242 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Chemical Oxygen Demand (COD) | 16 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1368307 | |
| Feb 16, 2026 | Chemical Oxygen Demand (COD) | 18 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1368307 | |
| Feb 16, 2026 | Chemical Oxygen Demand (COD) | 21 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1368307 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368307 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368307 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368307 | |
| Feb 16, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1368307 | |
| Feb 16, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1368307 | |
| Feb 16, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1368307 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 31 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368307 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368307 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 29 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368307 | |
| Nov 20, 2025 | Chemical Oxygen Demand (COD) | ND | mg/L | Effluent | Qualifying Storm Event | A5220D | 1360525 | |
| Nov 20, 2025 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360525 | |
| Nov 20, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1360525 | |
| Nov 20, 2025 | Total Suspended Solids (TSS) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360525 | |
| Dec 14, 2024 | Chemical Oxygen Demand (COD) | 41 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1317889 | |
| Dec 14, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1317889 | |
| Dec 14, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1317889 | |
| Dec 14, 2024 | Total Suspended Solids (TSS) | 17 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317889 | |
| Dec 12, 2024 | Chemical Oxygen Demand (COD) | 26 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1317889 | |
| Dec 12, 2024 | Chemical Oxygen Demand (COD) | 23 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1317889 | |
| Dec 12, 2024 | Chemical Oxygen Demand (COD) | 32 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1317889 | |
| Dec 12, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1317889 | |
| Dec 12, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1317889 | |
| Dec 12, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1317889 | |
| Dec 12, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1317889 | |
| Dec 12, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1317889 | |
| Dec 12, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1317889 | |
| Dec 12, 2024 | Total Suspended Solids (TSS) | 8.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317889 | |
| Dec 12, 2024 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317889 | |
| Dec 12, 2024 | Total Suspended Solids (TSS) | 11 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317889 | |
| Jan 03, 2024 | Chemical Oxygen Demand (COD) | 32 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1271775 | |
| Jan 03, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1271775 | |
| Jan 03, 2024 | pH | 5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1271775 | |
| Jan 03, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1271775 | |
| Dec 18, 2023 | Chemical Oxygen Demand (COD) | 63 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1271775 | |
| Dec 18, 2023 | Chemical Oxygen Demand (COD) | 18 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1271775 | |
| Dec 18, 2023 | Chemical Oxygen Demand (COD) | 39 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1271775 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1271775 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1271775 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1271775 | |
| Dec 18, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1271775 | |
| Dec 18, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1271775 | |
| Dec 18, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1271775 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1271775 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | 6.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1271775 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | 7.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1271775 | |
| Dec 27, 2022 | Ammonia, Total (as N) | .13 | mg/L | Effluent | Qualifying Storm Event | E350.1 | 1222011 | |
| Dec 27, 2022 | Chemical Oxygen Demand (COD) | 100 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1222011 |
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 | 2 | 2 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Feb 27, 2001 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Apr 17, 2001 – Apr 17, 2001 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Nov 18, 2016 – Nov 18, 2016 | 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 (15 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 25, 2026 | Annual reports | 1335908 | Annual report 2025 | — | |
| Jun 17, 2025 | Annual reports | 1294745 | Annual report 2024 | — | |
| Jun 19, 2024 | Annual reports | 1243856 | Annual report 2023 | — | |
| Jun 27, 2023 | Annual reports | 1189886 | Annual report 2022 | — | |
| Jun 21, 2022 | Annual reports | 1113307 | Annual report 2021 | — | |
| Jun 28, 2021 | Annual reports | 1069346 | Annual report 2020 | — | |
| Jun 25, 2020 | Annual reports | 986657 | Annual report 2019 | — | |
| Jul 05, 2019 | Annual reports | 954238 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 939655 | Annual report 2017 | — | |
| Jun 26, 2017 | Annual reports | 878937 | Annual report 2016 | — | |
| Nov 18, 2016 | Inspections | 2033272 | B Type compliance | — | No Further Action |
| Jun 23, 2016 | Annual reports | 841263 | Annual report 2015 | — | |
| Apr 17, 2001 | Enforcement actions | 234731 | NOV (Notice of Violation) | Historical | UNKNOWN |
| Feb 27, 2001 | Violations | 181153 | Deficient BMP Implementation | Violation | Inspection |
| Jul 02, 1999 | Violations | 143464 | Deficient Report | Violation | Inspection |
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.