LOS BANOS CITY OF
Active WDID 5F24I001188 Los Banos, Merced County Region 5F · Central Valley (Fresno)
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Los Banos, Merced County
- Region 5F · Central Valley (Fresno) · Location · Statewide map
- Receiving water
- Mud Slough (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
- 124 distinct results, 8 reporting years (2015 to 2025)
- Most recent sample Feb 18, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 0 violation records · 3 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
- 37.06157, -120.84743
- 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
- 1000 Airport Road, Los Banos 93635
- Regional Water Board
- 5F — Central Valley (Fresno)
HUC12 watershed Evidence: spatial
- Mud Slough HUC12 180400012102
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
- City of Los Banos
- Primary industry (SIC)
- 4581-Airports, Flying Fields, and Airport Terminal Services
- Application ID
- 196611
- NOI processed
- Mar 26, 1992
- Last certified
- May 01, 2026
- Facility size
- 150 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 196611 | Industrial | Active | Mar 26, 1992 | — | May 01, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Mud Slough
- Discharges directly / indirectly
- N / 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.
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.
124 distinct measurements across 6 parameters, most recent sample Feb 18, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 23 | 6 | 0 | Nov 17, 2025 | Feb 18, 2026 |
| 2023 | 12 | 6 | 0 | Jan 22, 2024 | Feb 01, 2024 |
| 2022 | 29 | 6 | 0 | Dec 12, 2022 | Mar 02, 2023 |
| 2021 | 12 | 6 | 0 | Dec 27, 2021 | Dec 29, 2021 |
| 2020 | 6 | 6 | 0 | Jan 28, 2021 | Jan 28, 2021 |
| 2018 | 6 | 6 | 0 | Feb 15, 2019 | Feb 15, 2019 |
| 2016 | 24 | 6 | 0 | Jan 05, 2017 | Mar 23, 2017 |
| 2015 | 12 | 6 | 0 | Jan 06, 2016 | May 06, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Ammonia, Total (as N) | mg/L | 21 | 8 | Jan 06, 2016 | Feb 18, 2026 | Results |
| Chemical Oxygen Demand (COD) | mg/L | 21 | 3 | Jan 06, 2016 | Feb 18, 2026 | Results |
| Oil and Grease | mg/L | 21 | 19 | Jan 06, 2016 | Feb 18, 2026 | Results |
| pH | SU | 21 | 0 | Jan 06, 2016 | Feb 18, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 21 | 0 | Jan 06, 2016 | Feb 18, 2026 | Results |
| Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | mg/L | 19 | 6 | Jan 06, 2016 | Feb 18, 2026 | Results |
All results (124 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 18, 2026 | Ammonia, Total (as N) | .42 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1369956 | |
| Feb 18, 2026 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 41 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1369956 | |
| Feb 18, 2026 | Chemical Oxygen Demand (COD) | 390 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1369956 | |
| Feb 18, 2026 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369956 | |
| Feb 18, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1369956 | |
| Feb 18, 2026 | Total Suspended Solids (TSS) | 31 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369956 | |
| Jan 05, 2026 | Ammonia, Total (as N) | .3 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1364616 | |
| Jan 05, 2026 | Chemical Oxygen Demand (COD) | 190 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1364616 | |
| Jan 05, 2026 | Oil and Grease | DNQ 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364616 | |
| Jan 05, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1364616 | |
| Jan 05, 2026 | Total Suspended Solids (TSS) | 25 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364616 | |
| Dec 26, 2025 | Ammonia, Total (as N) | .49 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1364613 | |
| Dec 26, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 5.9 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1364613 | |
| Dec 26, 2025 | Chemical Oxygen Demand (COD) | 160 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1364613 | |
| Dec 26, 2025 | Oil and Grease | DNQ 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364613 | |
| Dec 26, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1364613 | |
| Dec 26, 2025 | Total Suspended Solids (TSS) | 50 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364613 | |
| Nov 17, 2025 | Ammonia, Total (as N) | .42 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1359328 | |
| Nov 17, 2025 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 23 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1359328 | |
| Nov 17, 2025 | Chemical Oxygen Demand (COD) | 130 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1359328 | |
| Nov 17, 2025 | Oil and Grease | DNQ 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359328 | |
| Nov 17, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1359328 | |
| Nov 17, 2025 | Total Suspended Solids (TSS) | 93 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359328 | |
| Feb 01, 2024 | Ammonia, Total (as N) | .32 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1279615 | |
| Feb 01, 2024 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | DNQ 4.1 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1279615 | |
| Feb 01, 2024 | Chemical Oxygen Demand (COD) | 290 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1279615 | |
| Feb 01, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1279615 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279615 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 4.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279615 | |
| Jan 22, 2024 | Ammonia, Total (as N) | .34 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1274779 | |
| Jan 22, 2024 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1274779 | |
| Jan 22, 2024 | Chemical Oxygen Demand (COD) | 85 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1274779 | |
| Jan 22, 2024 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1274779 | |
| Jan 22, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1274779 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | 57 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1274779 | |
| Mar 02, 2023 | Ammonia, Total (as N) | .39 | mg/L | Effluent | Qualifying Storm Event | A4500NHG | 1232374 | |
| Mar 02, 2023 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | 5.5 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1232374 | |
| Mar 02, 2023 | Chemical Oxygen Demand (COD) | 60 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1232374 | |
| Mar 02, 2023 | Oil and Grease | DNQ 2.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1232374 | |
| Mar 02, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1232374 | |
| Mar 02, 2023 | Total Suspended Solids (TSS) | 43 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1232374 | |
| Jan 30, 2023 | Ammonia, Total (as N) | .44 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1227457 | |
| Jan 30, 2023 | Chemical Oxygen Demand (COD) | DNQ 47 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1227457 | |
| Jan 30, 2023 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1227457 | |
| Jan 30, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1227457 | |
| Jan 30, 2023 | Total Suspended Solids (TSS) | 140 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1227457 | |
| Jan 19, 2023 | Ammonia, Total (as N) | .56 | mg/L | Effluent | Qualifying Storm Event | A4500NH | 1226271 | |
| Jan 19, 2023 | Biochemical Oxygen Demand (BOD) (5-day @ 20 Deg. C) | DNQ 4.5 | mg/L | Effluent | Qualifying Storm Event | A5210B | 1226271 | |
| Jan 19, 2023 | Chemical Oxygen Demand (COD) | 120 | mg/L | Effluent | Qualifying Storm Event | A5220D | 1226271 | |
| Jan 19, 2023 | Oil and Grease | ND 0 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1226271 |
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 | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Sep 05, 2008 – Feb 04, 2011 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Jan 12, 2004 – Mar 18, 2019 | Oct 21, 2026 | All inspections |
| Annual reports | 10 | 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 |
|---|---|---|---|---|---|
| Jul 15, 2026 | Annual reports | 1335140 | Annual report 2025 | — | |
| Jul 08, 2025 | Annual reports | 1293942 | Annual report 2024 | — | |
| Jul 15, 2024 | Annual reports | 1243018 | Annual report 2023 | — | |
| Jun 12, 2023 | Annual reports | 1189010 | Annual report 2022 | — | |
| Jul 13, 2022 | Annual reports | 1112364 | Annual report 2021 | — | |
| Jul 02, 2020 | Annual reports | 985602 | Annual report 2019 | — | |
| Jul 15, 2019 | Annual reports | 953142 | Annual report 2018 | — | |
| Mar 18, 2019 | Inspections | 2041849 | B Type compliance | — | No Further Action |
| Jul 13, 2018 | Annual reports | 938558 | Annual report 2017 | — | |
| Jun 12, 2017 | Annual reports | 877782 | Annual report 2016 | — | |
| Jun 08, 2016 | Annual reports | 840318 | Annual report 2015 | — | |
| Feb 04, 2011 | Enforcement actions | 404102 | Verbal Communication | Historical | |
| Jun 17, 2009 | Enforcement actions | 366204 | NOV (Notice of Violation) | Historical | |
| Sep 05, 2008 | Enforcement actions | 366257 | SEL (Staff Enforcement Letter) | Historical | |
| Jan 12, 2004 | Inspections | 337491 | B Type compliance | — |
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.