Digitran unit of Electroswitch
Active WDID 8 36I027384 Rancho Cucamonga, San Bernardino 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
- Rancho Cucamonga, San Bernardino County
- Region 8 · Santa Ana · Location · Statewide map
- 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; 0 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 78 distinct results, 9 reporting years (2017 to 2025)
- Most recent sample Feb 18, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 1 violation record · 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
- 34.080762, -117.5777
- Precision
- 4 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
- 10410 Trademark Street, Rancho Cucamonga 91730
- Regional Water Board
- 8 — Santa Ana
HUC12 watershed Evidence: spatial
- Upper Cucamonga Creek HUC12 180702030704
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
- Digitran unit of Electroswitch
- Primary industry (SIC)
- 3679-Electronic Components, NEC
- Application ID
- 491226
- NOI processed
- Oct 16, 2017
- Last certified
- Sep 21, 2017
- Facility size
- 23700 SqFt
- Impervious area
- 100 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 491226 | Industrial | Active | Oct 16, 2017 | — | Sep 21, 2017 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Day Creek Chanel
- Discharges directly / indirectly
- N / Y (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 |
|---|---|---|---|
| Deer Creek (Valley Reach) CAR8012100020110720155555 | 867 m | not listed | 0 |
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.
78 distinct measurements across 3 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 | 12 | 3 | 0 | Oct 14, 2025 | Feb 18, 2026 |
| 2024 | 9 | 3 | 0 | Nov 15, 2024 | Apr 26, 2025 |
| 2023 | 9 | 3 | 0 | Dec 20, 2023 | Feb 01, 2024 |
| 2022 | 12 | 3 | 0 | Nov 02, 2022 | Jan 14, 2023 |
| 2021 | 12 | 3 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 3 | 3 | 0 | Mar 10, 2021 | Mar 10, 2021 |
| 2019 | 9 | 3 | 0 | Nov 27, 2019 | Apr 06, 2020 |
| 2018 | 6 | 3 | 0 | Jan 16, 2019 | Jan 31, 2019 |
| 2017 | 6 | 3 | 0 | Jan 09, 2018 | Mar 22, 2018 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 26 | 5 | Jan 09, 2018 | Feb 18, 2026 | Results |
| pH | SU | 26 | 1 | Jan 09, 2018 | Feb 18, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 26 | 0 | Jan 09, 2018 | Feb 18, 2026 | Results |
All results (78 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 18, 2026 | Oil and Grease | .9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370756 | |
| Feb 18, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370756 | |
| Feb 18, 2026 | Total Suspended Solids (TSS) | 8.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370756 | |
| Feb 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1370753 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370753 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 1.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370753 | |
| Nov 14, 2025 | Oil and Grease | 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363605 | |
| Nov 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1363605 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363605 | |
| Oct 14, 2025 | Oil and Grease | 3 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363598 | |
| Oct 14, 2025 | pH | < 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1363598 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 90 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363598 | |
| Apr 26, 2025 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1333388 | |
| Apr 26, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1333388 | |
| Apr 26, 2025 | Total Suspended Solids (TSS) | 23.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1333388 | |
| Feb 12, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1331588 | |
| Feb 12, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1331588 | |
| Feb 12, 2025 | Total Suspended Solids (TSS) | 10.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1331588 | |
| Nov 15, 2024 | Oil and Grease | 3.7 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1321076 | |
| Nov 15, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1321076 | |
| Nov 15, 2024 | Total Suspended Solids (TSS) | 40.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1321076 | |
| Feb 01, 2024 | Oil and Grease | 1.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1283008 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1283008 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 41.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1283008 | |
| Jan 20, 2024 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1279450 | |
| Jan 20, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279450 | |
| Jan 20, 2024 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279450 | |
| Dec 20, 2023 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1279433 | |
| Dec 20, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1279433 | |
| Dec 20, 2023 | Total Suspended Solids (TSS) | 46.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279433 | |
| Jan 14, 2023 | Oil and Grease | 0 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1226913 | |
| Jan 14, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1226913 | |
| Jan 14, 2023 | Total Suspended Solids (TSS) | 20.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1226913 | |
| Jan 05, 2023 | Oil and Grease | 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1225173 | |
| Jan 05, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1225173 | |
| Jan 05, 2023 | Total Suspended Solids (TSS) | 15.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1225173 | |
| Nov 08, 2022 | Oil and Grease | 0 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1218466 | |
| Nov 08, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1218466 | |
| Nov 08, 2022 | Total Suspended Solids (TSS) | 12.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1218466 | |
| Nov 02, 2022 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1215521 | |
| Nov 02, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1215521 | |
| Nov 02, 2022 | Total Suspended Solids (TSS) | 37.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1215521 | |
| Mar 28, 2022 | Oil and Grease | 13 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1181033 | |
| Mar 28, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1181033 | |
| Mar 28, 2022 | Total Suspended Solids (TSS) | 124 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1181033 | |
| Feb 15, 2022 | Oil and Grease | .8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1178185 | |
| Feb 15, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1178185 | |
| Feb 15, 2022 | Total Suspended Solids (TSS) | 24.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1178185 | |
| Dec 14, 2021 | Oil and Grease | 12.1 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1177641 | |
| Dec 14, 2021 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1177641 |
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 | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 16, 2026 – Jul 16, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Jul 22, 2026 – Jul 22, 2026 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| Annual reports | 9 | certified reports (contents not shown) | 2017 – 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 (11 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 27, 2026 | Annual reports | 1339714 | Annual report 2025 | — | |
| Jul 22, 2026 | Enforcement actions | 470939 | NOV (Notice of Violation) | Historical | |
| Jul 16, 2026 | Violations | 905016 | Late Report | Violation | Report |
| Jul 15, 2025 | Annual reports | 1298788 | Annual report 2024 | — | |
| Jul 10, 2024 | Annual reports | 1248087 | Annual report 2023 | — | |
| Jul 11, 2023 | Annual reports | 1194324 | Annual report 2022 | — | |
| Jul 06, 2022 | Annual reports | 1118259 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1066536 | Annual report 2020 | — | |
| Jul 30, 2020 | Annual reports | 983667 | Annual report 2019 | — | |
| Jul 12, 2018 | Annual reports | 976042 | Annual report 2017 | — | |
| Jun 27, 2018 | Annual reports | 979608 | Annual report 2018 | — |
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.