Tri City Rock Inc
Active WDID 2 01I013675 Fremont, Alameda County Region 2 · San Francisco Bay
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Fremont, Alameda County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Unnamed tributary of engineered channel Line E of Laguna 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
- 3 waterbodies; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 215 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Apr 10, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 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
- 37.52013, -121.9464
- 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
- 43157 Osgood Rd, Fremont 94539
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Agua Caliente Creek-Frontal San Francisco Bay Estuaries HUC12 180500040701
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
- Tri City Rock Inc
- Primary industry (SIC)
- 3273-Ready-Mixed Concrete
- Secondary SIC
- 1411-Dimension Stone
- Application ID
- 181055
- NOI processed
- Jan 06, 1998
- Last certified
- Aug 13, 2015
- Facility size
- 4 Acres
- Impervious area
- 99 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 181055 | Industrial | Active | Jan 06, 1998 | — | Aug 13, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Unnamed tributary of engineered channel Line E of Laguna 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 |
|---|---|---|---|
| Laguna Creek (Alameda County) CAR2052000020210704058633 | 720 m | listed | 1 |
| Canada Del Aliso (Alameda County) CAR2052000020210614023527 | 884 m | not listed | 0 |
| Sabercat Creek (Alameda County) CAR2052000020210614027807 | 888 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.
215 distinct measurements across 6 parameters, most recent sample Apr 10, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 10 | 5 | 0 | Feb 16, 2026 | Apr 10, 2026 |
| 2024 | 20 | 5 | 0 | Nov 25, 2024 | Mar 06, 2025 |
| 2023 | 20 | 5 | 0 | Dec 18, 2023 | Jan 22, 2024 |
| 2022 | 35 | 5 | 0 | Nov 02, 2022 | Feb 03, 2023 |
| 2021 | 25 | 5 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 15 | 5 | 0 | Jan 22, 2021 | Mar 10, 2021 |
| 2019 | 10 | 5 | 0 | Jan 14, 2020 | Jan 16, 2020 |
| 2018 | 20 | 5 | 0 | Dec 05, 2018 | Mar 27, 2019 |
| 2017 | 32 | 4 | 0 | Nov 17, 2017 | Mar 14, 2018 |
| 2016 | 20 | 4 | 0 | Oct 27, 2016 | Jan 22, 2017 |
| 2015 | 8 | 4 | 0 | Dec 03, 2015 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 46 | 39 | Dec 03, 2015 | Apr 10, 2026 | Results |
| pH | SU | 46 | 0 | Dec 03, 2015 | Apr 10, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 46 | 18 | Dec 03, 2015 | Apr 10, 2026 | Results |
| Iron, Total | mg/L | 44 | 18 | Dec 03, 2015 | Apr 10, 2026 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 31 | 0 | Dec 05, 2018 | Apr 10, 2026 | Results |
| Lead, Total | mg/L | 2 | 0 | Jan 14, 2020 | Jan 16, 2020 | Results |
All results (215 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 10, 2026 | Electrical Conductivity @ 25 Deg. C | 86 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1372046 | |
| Apr 10, 2026 | Iron, Total | .47 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1372046 | |
| Apr 10, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1372046 | |
| Apr 10, 2026 | pH | 8.59 | SU | Effluent | Qualifying Storm Event | pH_Field | 1372046 | |
| Apr 10, 2026 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1372046 | |
| Feb 16, 2026 | Electrical Conductivity @ 25 Deg. C | 90 | umhos/cm | Effluent | Qualifying Storm Event | E120.1 | 1367708 | |
| Feb 16, 2026 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367708 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1367708 | |
| Feb 16, 2026 | pH | 8.43 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367708 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | DNQ 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367708 | |
| Mar 06, 2025 | Electrical Conductivity @ 25 Deg. C | 350 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1326977 | |
| Mar 06, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1326977 | |
| Mar 06, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1326977 | |
| Mar 06, 2025 | pH | 8.53 | SU | Effluent | Qualifying Storm Event | pH_Field | 1326977 | |
| Mar 06, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1326977 | |
| Jan 03, 2025 | Electrical Conductivity @ 25 Deg. C | 180 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1319817 | |
| Jan 03, 2025 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1319817 | |
| Jan 03, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1319817 | |
| Jan 03, 2025 | pH | 8.55 | SU | Effluent | Qualifying Storm Event | pH_Field | 1319817 | |
| Jan 03, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1319817 | |
| Dec 12, 2024 | Electrical Conductivity @ 25 Deg. C | 85 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1318942 | |
| Dec 12, 2024 | Iron, Total | 1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1318942 | |
| Dec 12, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1318942 | |
| Dec 12, 2024 | pH | 8.19 | SU | Effluent | Qualifying Storm Event | pH_Field | 1318942 | |
| Dec 12, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1318942 | |
| Nov 25, 2024 | Electrical Conductivity @ 25 Deg. C | 76 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1316245 | |
| Nov 25, 2024 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1316245 | |
| Nov 25, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1316245 | |
| Nov 25, 2024 | pH | 8.41 | SU | Effluent | Qualifying Storm Event | pH_Field | 1316245 | |
| Nov 25, 2024 | Total Suspended Solids (TSS) | DNQ 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1316245 | |
| Jan 22, 2024 | Electrical Conductivity @ 25 Deg. C | 12 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1275827 | |
| Jan 22, 2024 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1275827 | |
| Jan 22, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1275827 | |
| Jan 22, 2024 | pH | 8.68 | SU | Effluent | Qualifying Storm Event | pH_Field | 1275827 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | DNQ 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1275827 | |
| Jan 10, 2024 | Electrical Conductivity @ 25 Deg. C | 64 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1275820 | |
| Jan 10, 2024 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1275820 | |
| Jan 10, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1275820 | |
| Jan 10, 2024 | pH | 8.29 | SU | Effluent | Qualifying Storm Event | pH_Field | 1275820 | |
| Jan 10, 2024 | Total Suspended Solids (TSS) | DNQ 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1275820 | |
| Dec 20, 2023 | Electrical Conductivity @ 25 Deg. C | 54 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1275809 | |
| Dec 20, 2023 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1275809 | |
| Dec 20, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1275809 | |
| Dec 20, 2023 | pH | 8.28 | SU | Effluent | Qualifying Storm Event | pH_Field | 1275809 | |
| Dec 20, 2023 | Total Suspended Solids (TSS) | DNQ 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1275809 | |
| Dec 18, 2023 | Electrical Conductivity @ 25 Deg. C | 77 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1270005 | |
| Dec 18, 2023 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1270005 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1270005 | |
| Dec 18, 2023 | pH | 8.54 | SU | Effluent | Qualifying Storm Event | pH_Field | 1270005 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | DNQ 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1270005 |
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 15, 2020 – Jul 15, 2020 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Jul 21, 2020 – Jul 21, 2020 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Nov 16, 2022 – Nov 16, 2022 | 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 (14 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 15, 2026 | Annual reports | 1337029 | Annual report 2025 | — | |
| Jul 16, 2025 | Annual reports | 1295919 | Annual report 2024 | — | |
| Jul 16, 2024 | Annual reports | 1245095 | Annual report 2023 | — | |
| Jul 15, 2023 | Annual reports | 1191183 | Annual report 2022 | — | |
| Nov 16, 2022 | Inspections | 2058626 | B Type compliance | Finalized | Additional Info Required |
| Nov 02, 2022 | Annual reports | 1114721 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1070820 | Annual report 2020 | — | |
| Aug 18, 2020 | Annual reports | 955877 | Annual report 2018 | — | |
| Jul 31, 2020 | Annual reports | 988242 | Annual report 2019 | — | |
| Jul 21, 2020 | Enforcement actions | 438039 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 15, 2020 | Violations | 874376 | Late Report | Violation | Report |
| Sep 11, 2018 | Annual reports | 941300 | Annual report 2017 | — | |
| Aug 24, 2017 | Annual reports | 880677 | Annual report 2016 | — | |
| Jul 15, 2016 | Annual reports | 846641 | 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.