Thompson Gundrilling Inc
Active WDID 4 19I014804 Van Nuys, Los Angeles County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Van Nuys, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Los Angeles River (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
- 155 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Apr 13, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 4 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
- 34.20996, -118.43425
- 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
- 13840 Saticoy St, Van Nuys 91402
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Tujunga Wash-Los Angeles River HUC12 180701050208
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
- Thompson Gundrilling Inc
- Primary industry (SIC)
- 3399-Primary Metal Products, NEC
- Application ID
- 190771
- NOI processed
- Dec 05, 1998
- Last certified
- May 19, 2015
- Facility size
- 54000 SqFt
- Impervious area
- 1 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 190771 | Industrial | Active | Dec 05, 1998 | — | May 19, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Los Angeles River
- 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
7 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 |
|---|---|---|---|
| Tujunga Wash (LA River to Hansen Dam) CAR4052100019990202134750 | 743 m | listed | 4 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
SMARTS TMDL record as reported for this facility; it is not a determination that the TMDL applies to the facility.
| TMDL | Waterbody (as reported) | Parameter | Limit | Type | Period | Due | Discharges to TMDL water |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Copper, Total | .06749 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Lead, Total | .094 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
3 records. Links between these records and specific TMDL projects or listed waterbodies have not been reviewed and are not shown.
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.
155 distinct measurements across 9 parameters, most recent sample Apr 13, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 24 | 8 | 0 | Sep 18, 2025 | Apr 13, 2026 |
| 2024 | 16 | 8 | 0 | Feb 13, 2025 | Mar 05, 2025 |
| 2023 | 8 | 8 | 0 | Nov 15, 2023 | Nov 15, 2023 |
| 2022 | 24 | 8 | 0 | Nov 08, 2022 | Feb 24, 2023 |
| 2021 | 15 | 8 | 0 | Oct 25, 2021 | Dec 14, 2021 |
| 2020 | 10 | 5 | 0 | Mar 10, 2021 | Mar 15, 2021 |
| 2019 | 21 | 7 | 0 | Nov 27, 2019 | Apr 06, 2020 |
| 2018 | 21 | 7 | 0 | Dec 06, 2018 | Feb 14, 2019 |
| 2017 | 7 | 7 | 0 | Mar 27, 2018 | Mar 27, 2018 |
| 2016 | 5 | 5 | 0 | Feb 06, 2017 | Feb 06, 2017 |
| 2015 | 4 | 4 | 0 | Jan 05, 2016 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 22 | 12 | Jan 05, 2016 | Apr 13, 2026 | Results |
| pH | SU | 22 | 0 | Jan 05, 2016 | Apr 13, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 22 | 1 | Jan 05, 2016 | Apr 13, 2026 | Results |
| Aluminum, Total | mg/L | 21 | 0 | Feb 06, 2017 | Apr 13, 2026 | Results |
| Copper, Total | mg/L | 18 | 1 | Mar 27, 2018 | Apr 13, 2026 | Results |
| Lead, Total | mg/L | 18 | 1 | Mar 27, 2018 | Apr 13, 2026 | Results |
| Zinc, Total | mg/L | 18 | 1 | Mar 27, 2018 | Apr 13, 2026 | Results |
| Iron, Total | mg/L | 12 | 0 | Mar 10, 2021 | Apr 13, 2026 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 2 | 0 | Jan 05, 2016 | Feb 06, 2017 | Results |
All results (155 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 13, 2026 | Aluminum, Total | .289 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1372371 | |
| Apr 13, 2026 | Copper, Total | .00737 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1372371 | |
| Apr 13, 2026 | Iron, Total | .955 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1372371 | |
| Apr 13, 2026 | Lead, Total | .0018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1372371 | |
| Apr 13, 2026 | Oil and Grease | DNQ 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372371 | |
| Apr 13, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1372371 | |
| Apr 13, 2026 | Total Suspended Solids (TSS) | 23.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372371 | |
| Apr 13, 2026 | Zinc, Total | .505 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1372371 | |
| Nov 20, 2025 | Aluminum, Total | .174 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360755 | |
| Nov 20, 2025 | Copper, Total | .00947 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360755 | |
| Nov 20, 2025 | Iron, Total | .159 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1360755 | |
| Nov 20, 2025 | Lead, Total | DNQ .000879 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360755 | |
| Nov 20, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360755 | |
| Nov 20, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1360755 | |
| Nov 20, 2025 | Total Suspended Solids (TSS) | DNQ 4.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360755 | |
| Nov 20, 2025 | Zinc, Total | .034 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360755 | |
| Sep 18, 2025 | Aluminum, Total | .302 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1349291 | |
| Sep 18, 2025 | Copper, Total | .0978 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1349291 | |
| Sep 18, 2025 | Iron, Total | 1.01 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1349291 | |
| Sep 18, 2025 | Lead, Total | .0101 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1349291 | |
| Sep 18, 2025 | Oil and Grease | DNQ 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1349291 | |
| Sep 18, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1349291 | |
| Sep 18, 2025 | Total Suspended Solids (TSS) | 33.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1349291 | |
| Sep 18, 2025 | Zinc, Total | .919 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1349291 | |
| Mar 05, 2025 | Aluminum, Total | .821 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330695 | |
| Mar 05, 2025 | Copper, Total | .0337 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330695 | |
| Mar 05, 2025 | Iron, Total | 1.19 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1330695 | |
| Mar 05, 2025 | Lead, Total | .00472 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330695 | |
| Mar 05, 2025 | Oil and Grease | 6.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1330695 | |
| Mar 05, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1330695 | |
| Mar 05, 2025 | Total Suspended Solids (TSS) | 35 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1330695 | |
| Mar 05, 2025 | Zinc, Total | .229 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330695 | |
| Feb 13, 2025 | Aluminum, Total | .0133 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324798 | |
| Feb 13, 2025 | Copper, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324798 | |
| Feb 13, 2025 | Iron, Total | .48 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1324798 | |
| Feb 13, 2025 | Lead, Total | .00261 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324798 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1324798 | |
| Feb 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1324798 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 21.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324798 | |
| Feb 13, 2025 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1324798 | |
| Nov 15, 2023 | Aluminum, Total | 1.05 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1290092 | |
| Nov 15, 2023 | Copper, Total | .0694 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1290092 | |
| Nov 15, 2023 | Iron, Total | 1.37 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1290092 | |
| Nov 15, 2023 | Lead, Total | .0115 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1290092 | |
| Nov 15, 2023 | Oil and Grease | 5.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1290092 | |
| Nov 15, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1290092 | |
| Nov 15, 2023 | Total Suspended Solids (TSS) | 35.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1290092 | |
| Nov 15, 2023 | Zinc, Total | 1.23 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1290092 | |
| Feb 24, 2023 | Aluminum, Total | .151 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1238093 | |
| Feb 24, 2023 | Copper, Total | .0116 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1238093 |
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 | 4 | 4 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – May 19, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Feb 12, 2025 – May 19, 2026 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Apr 22, 2025 – Apr 22, 2025 | 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 (19 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 08, 2026 | Annual reports | 1336097 | Annual report 2025 | — | |
| May 19, 2026 | Enforcement actions | 469923 | EPL (Expedited Payment Letter) | Active | R4-2026-0053 |
| May 19, 2026 | Violations | 903998 | Late Report | Violation | Report |
| Jul 01, 2025 | Annual reports | 1294948 | Annual report 2024 | — | |
| Jun 04, 2025 | Violations | 891411 | Late Report | Violation | Report |
| May 29, 2025 | Enforcement actions | 456230 | EPL (Expedited Payment Letter) | Historical | R4-2025-0045 |
| Apr 22, 2025 | Inspections | 2067696 | B Type compliance | Performed | No Further Action |
| Feb 12, 2025 | Enforcement actions | 455469 | NOV (Notice of Violation) | Historical | |
| Feb 12, 2025 | Violations | 890771 | Late Report | Violation | Report |
| Jul 12, 2024 | Annual reports | 1244071 | Annual report 2023 | — | |
| Jun 26, 2023 | Annual reports | 1190112 | Annual report 2022 | — | |
| Jul 19, 2022 | Annual reports | 1113558 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1069609 | Annual report 2020 | — | |
| Jul 13, 2020 | Annual reports | 986934 | Annual report 2019 | — | |
| Jul 11, 2019 | Annual reports | 954522 | Annual report 2018 | — | |
| Aug 03, 2018 | Annual reports | 939940 | Annual report 2017 | — | |
| Jul 14, 2017 | Annual reports | 879237 | Annual report 2016 | — | |
| Aug 03, 2016 | Annual reports | 843574 | Annual report 2015 | — | |
| Jul 02, 1999 | Violations | 157869 | 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.