Dumbarton Quarry
Active WDID 2 01I001245 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
- San Francisco (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
- 103 distinct results, 9 reporting years (2016 to 2025)
- Most recent sample Mar 12, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 0 violation records · 0 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
- 37.54289, -122.06875
- 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
- 9600 Quarry Rd, Fremont 94555
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Plummer Creek-Frontal San Francisco Bay Estuaries HUC12 180500040702
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
- Dumbarton Quarry Association
- Primary industry (SIC)
- 1429-Crushed and Broken Stone, NEC
- Secondary SIC
- 2951-Asphalt Paving Mixtures and Blocks
- Application ID
- 180651
- NOI processed
- Mar 26, 1992
- Last certified
- Jun 10, 2015
- Facility size
- 91 Acres
- Impervious area
- 95 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 180651 | Industrial | Active | Mar 26, 1992 | — | Jun 10, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Francisco
- 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.
103 distinct measurements across 6 parameters, most recent sample Mar 12, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 12 | 3 | 0 | Nov 18, 2025 | Mar 12, 2026 |
| 2024 | 9 | 3 | 0 | Dec 30, 2024 | Feb 20, 2025 |
| 2023 | 6 | 3 | 0 | Jan 29, 2024 | Feb 27, 2024 |
| 2022 | 9 | 3 | 0 | Dec 02, 2022 | Jan 09, 2023 |
| 2020 | 6 | 3 | 0 | Jan 04, 2021 | Jan 28, 2021 |
| 2019 | 3 | 3 | 0 | Mar 25, 2020 | Mar 25, 2020 |
| 2018 | 6 | 3 | 0 | Jan 16, 2019 | Feb 13, 2019 |
| 2017 | 16 | 5 | 0 | Nov 16, 2017 | Mar 22, 2018 |
| 2016 | 36 | 6 | 0 | Oct 28, 2016 | Jan 10, 2017 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 29 | 0 | Oct 28, 2016 | Mar 12, 2026 | Results |
| Oil and Grease | mg/L | 28 | 19 | Oct 28, 2016 | Mar 12, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 28 | 5 | Oct 28, 2016 | Mar 12, 2026 | Results |
| Chemical Oxygen Demand (COD) | mg/L | 8 | 2 | Dec 23, 2016 | Feb 08, 2018 | Results |
| Magnesium, Total | mg/L | 8 | 0 | Dec 23, 2016 | Feb 08, 2018 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 2 | 0 | Oct 28, 2016 | Dec 15, 2016 | Results |
All results (103 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 12, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1376235 | |
| Mar 12, 2026 | pH | 7.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1376235 | |
| Mar 12, 2026 | Total Suspended Solids (TSS) | 2.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1376235 | |
| Feb 03, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1376234 | |
| Feb 03, 2026 | pH | 7.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1376234 | |
| Feb 03, 2026 | Total Suspended Solids (TSS) | 1.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1376234 | |
| Dec 31, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1376232 | |
| Dec 31, 2025 | pH | 7.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1376232 | |
| Dec 31, 2025 | Total Suspended Solids (TSS) | 5.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1376232 | |
| Nov 18, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1376230 | |
| Nov 18, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1376230 | |
| Nov 18, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1376230 | |
| Feb 20, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1332546 | |
| Feb 20, 2025 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332546 | |
| Feb 20, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332546 | |
| Feb 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1332544 | |
| Feb 05, 2025 | pH | 7.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332544 | |
| Feb 05, 2025 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332544 | |
| Dec 30, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1332543 | |
| Dec 30, 2024 | pH | 7.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1332543 | |
| Dec 30, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1332543 | |
| Feb 27, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1289861 | |
| Feb 27, 2024 | pH | 7.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1289861 | |
| Feb 27, 2024 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1289861 | |
| Jan 29, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1289860 | |
| Jan 29, 2024 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1289860 | |
| Jan 29, 2024 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1289860 | |
| Jan 09, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1238710 | |
| Jan 09, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238710 | |
| Jan 09, 2023 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238710 | |
| Jan 05, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1238709 | |
| Jan 05, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238709 | |
| Jan 05, 2023 | Total Suspended Solids (TSS) | 39 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238709 | |
| Dec 02, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1238708 | |
| Dec 02, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238708 | |
| Dec 02, 2022 | Total Suspended Solids (TSS) | 21 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238708 | |
| Jan 28, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1142639 | |
| Jan 28, 2021 | pH | 6.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1142639 | |
| Jan 28, 2021 | Total Suspended Solids (TSS) | 44 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1142639 | |
| Jan 04, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1139751 | |
| Jan 04, 2021 | pH | 6.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1139751 | |
| Jan 04, 2021 | Total Suspended Solids (TSS) | 46 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1139751 | |
| Mar 25, 2020 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1106611 | |
| Mar 25, 2020 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1106611 | |
| Mar 25, 2020 | Total Suspended Solids (TSS) | 33 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1106611 | |
| Feb 13, 2019 | Oil and Grease | 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1050776 | |
| Feb 13, 2019 | pH | 6.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1050776 | |
| Feb 13, 2019 | Total Suspended Solids (TSS) | 64 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1050776 | |
| Jan 16, 2019 | Oil and Grease | 1.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1050774 | |
| Jan 16, 2019 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1050774 |
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 | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | May 29, 2001 – May 29, 2001 | 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 (12 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 15, 2026 | Annual reports | 1337281 | Annual report 2025 | — | |
| Jul 10, 2025 | Annual reports | 1296187 | Annual report 2024 | — | |
| Jul 19, 2024 | Annual reports | 1245383 | Annual report 2023 | — | |
| Jul 12, 2023 | Annual reports | 1191489 | Annual report 2022 | — | |
| Jul 11, 2022 | Annual reports | 1115056 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1063148 | Annual report 2020 | — | |
| Jul 13, 2020 | Annual reports | 980021 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 956273 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 941700 | Annual report 2017 | — | |
| Jul 10, 2017 | Annual reports | 881097 | Annual report 2016 | — | |
| Jan 12, 2017 | Annual reports | 842334 | Annual report 2015 | — | |
| May 29, 2001 | Inspections | 313081 | Inspection from Vehicle | — |
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.