Maas Brothers Inc
Active WDID 2 01NEC015420 Livermore, Alameda County Region 2 · San Francisco Bay
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- No Exposure Certification (NEC) · Permits and applications
- Location Evidence: facility-reported
- Livermore, Alameda County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Arroyo Las Positas River (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
- 1 waterbody; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 288 distinct results, 3 reporting years (2022 to 2024)
- Most recent sample Mar 14, 2025 · 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
- 37.70186, -121.72092
- Precision
- 5 decimal places
- Shared point
- 2 permits report this exact point
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 285 S Vasco Road, Livermore 94551
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Upper Arroyo Las Positas HUC12 180500040202
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
- No Exposure Certification (NEC)
- Status
- Active
- Operator
- Maas Brothers
- Primary industry (SIC)
- 3479-Coating, Engraving, and Allied Services, NEC
- Application ID
- 542769
- NOI processed
- Nov 17, 2021
- Last certified
- Sep 23, 2026
- Facility size
- 2.75 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 |
|---|---|---|---|---|---|
| 542769 | Industrial | Active | Nov 17, 2021 | — | Sep 23, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Arroyo Las Positas River
- 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 |
|---|---|---|---|
| Arroyo Seco subwatershed (Alameda County, tributary to Arroyo Las Positas) CAR2043009020210603047098 | 609 m | listed | 3 |
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.
288 distinct measurements across 8 parameters, most recent sample Mar 14, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2024 | 128 | 8 | 0 | Nov 25, 2024 | Mar 14, 2025 |
| 2023 | 96 | 8 | 0 | Jan 22, 2024 | Mar 28, 2024 |
| 2022 | 64 | 8 | 0 | Feb 24, 2023 | Mar 10, 2023 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Iron, Total | mg/L | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 36 | 1 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Oil and Grease | mg/L | 36 | 4 | Feb 24, 2023 | Mar 14, 2025 | Results |
| pH | SU | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Phosphorus, Total (as P) | mg/L | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
| Zinc, Total | mg/L | 36 | 0 | Feb 24, 2023 | Mar 14, 2025 | Results |
All results (288 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 14, 2025 | Aluminum, Total | 3.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Aluminum, Total | 3.5 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Aluminum, Total | 1.2 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Aluminum, Total | 2.5 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Iron, Total | 2.3 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328956 | |
| Mar 14, 2025 | Iron, Total | 3.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328956 | |
| Mar 14, 2025 | Iron, Total | 1.4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328956 | |
| Mar 14, 2025 | Iron, Total | 2.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328956 | |
| Mar 14, 2025 | Nitrite Plus Nitrate (as N) | 1.5 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1328956 | |
| Mar 14, 2025 | Nitrite Plus Nitrate (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1328956 | |
| Mar 14, 2025 | Nitrite Plus Nitrate (as N) | .14 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1328956 | |
| Mar 14, 2025 | Nitrite Plus Nitrate (as N) | .26 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1328956 | |
| Mar 14, 2025 | Oil and Grease | 3.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328956 | |
| Mar 14, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328956 | |
| Mar 14, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328956 | |
| Mar 14, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328956 | |
| Mar 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328956 | |
| Mar 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328956 | |
| Mar 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328956 | |
| Mar 14, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328956 | |
| Mar 14, 2025 | Phosphorus, Total (as P) | .23 | mg/L | Effluent | Qualifying Storm Event | A4500PFH | 1328956 | |
| Mar 14, 2025 | Phosphorus, Total (as P) | .19 | mg/L | Effluent | Qualifying Storm Event | A4500PFH | 1328956 | |
| Mar 14, 2025 | Phosphorus, Total (as P) | .29 | mg/L | Effluent | Qualifying Storm Event | A4500PFH | 1328956 | |
| Mar 14, 2025 | Phosphorus, Total (as P) | .23 | mg/L | Effluent | Qualifying Storm Event | A4500PFH | 1328956 | |
| Mar 14, 2025 | Total Suspended Solids (TSS) | 120 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328956 | |
| Mar 14, 2025 | Total Suspended Solids (TSS) | 34 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328956 | |
| Mar 14, 2025 | Total Suspended Solids (TSS) | 29 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328956 | |
| Mar 14, 2025 | Total Suspended Solids (TSS) | 39 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328956 | |
| Mar 14, 2025 | Zinc, Total | .11 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Zinc, Total | .47 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Zinc, Total | .29 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Mar 14, 2025 | Zinc, Total | .43 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328956 | |
| Feb 13, 2025 | Aluminum, Total | .46 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325504 | |
| Feb 13, 2025 | Aluminum, Total | 2.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325504 | |
| Feb 13, 2025 | Aluminum, Total | .43 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325504 | |
| Feb 13, 2025 | Aluminum, Total | 1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1325504 | |
| Feb 13, 2025 | Iron, Total | .39 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1325504 | |
| Feb 13, 2025 | Iron, Total | 1.5 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1325504 | |
| Feb 13, 2025 | Iron, Total | .26 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1325504 | |
| Feb 13, 2025 | Iron, Total | .93 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1325504 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .06 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1325504 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .05 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1325504 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .05 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1325504 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .073 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1325504 | |
| Feb 13, 2025 | Oil and Grease | 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1325504 | |
| Feb 13, 2025 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1325504 | |
| Feb 13, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1325504 | |
| Feb 13, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1325504 | |
| Feb 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1325504 | |
| Feb 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1325504 |
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 | Aug 12, 2022 – Aug 12, 2022 | Oct 21, 2026 | All inspections |
| Annual reports | 5 | certified reports (contents not shown) | 2021 – 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 (6 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 15, 2026 | Annual reports | 1341100 | Annual report 2025 | — | |
| May 21, 2025 | Annual reports | 1300280 | Annual report 2024 | — | |
| Jul 11, 2024 | Annual reports | 1249688 | Annual report 2023 | — | |
| Jun 27, 2023 | Annual reports | 1196032 | Annual report 2022 | — | |
| Oct 05, 2022 | Annual reports | 1169180 | Annual report 2021 | — | |
| Aug 12, 2022 | Inspections | 2057369 | B Type compliance | Finalized | No Further Action |
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.