Petaluma Ready Mix
Terminated WDID 2 49I027340 Petaluma, Sonoma County Region 2 · San Francisco Bay
At a glance
- Permit Evidence: SMARTS record
- Terminated Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Petaluma, Sonoma County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Petaluma River (as reported by the facility)
- Evidence: identification corroborated Petaluma River Details
- Identified receiving water on the 2026 303(d) list
- Yes · 8 Appendix A decisions, category 5 Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 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
- 54 distinct results, 6 reporting years (2018 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 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
- 38.235, -122.63066
- Precision
- 3 decimal places low precision
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 400 Hopper Street, Petaluma 94952
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Novato Creek-Frontal San Pablo Bay Estuaries HUC12 180500020801
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
- Terminated
- Operator
- CalMat Co dba Shamrock Materials Inc
- Primary industry (SIC)
- 3273-Ready-Mixed Concrete
- Application ID
- 490638
- NOI processed
- Sep 13, 2017
- Termination effective
- Jun 18, 2026
- Last certified
- Dec 13, 2024
- Facility size
- 4.66 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 |
|---|---|---|---|---|---|
| 490638 | Industrial | Terminated | Sep 13, 2017 | Jun 18, 2026 | Dec 13, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Petaluma River
- Discharges directly / indirectly
- Y / N (as answered in the permit application)
Evidence: identification corroborated Petaluma River CAR2063002019980928165716
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 236 m. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Petaluma River is on the 2026 Clean Water Act section 303(d) list (8 Appendix A decisions; category 5).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Benthic Community Effects | 5 | List on 303(d) list (TMDL required list) | 5A | 154146 |
| Diazinon | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · San Francisco Bay Urban Creeks Diazinon | 142234 |
| Fipronil | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | 5B · San Francisco Bay Urban Creeks Diazinon | 142257 |
| Indicator Bacteria | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Petaluma River Bacteria TMDL | 149124 |
| Nutrients | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 151286 |
| Oxygen, Dissolved | 5 | List on 303(d) list (TMDL required list) | 5A | 142245 |
| Sediment | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 151328 |
| Trash | 5 | Do Not Delist from 303(d) list (being addressed with action other than TMDL) | 5C | 88894 |
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. State Board adoption 2026-02-03; USEPA approval not confirmed. A listing describes the waterbody, not this facility. Waterbody profile.
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 |
|---|---|---|---|
| Petaluma River CAR2063002019980928165716 | 236 m | listed | 8 |
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.
54 distinct measurements across 8 parameters, most recent sample Feb 16, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 8 | 8 | 0 | Feb 16, 2026 | Feb 16, 2026 |
| 2024 | 14 | 5 | 0 | Nov 20, 2024 | Feb 13, 2025 |
| 2023 | 3 | 3 | 0 | Dec 20, 2023 | Dec 20, 2023 |
| 2022 | 12 | 4 | 0 | Dec 30, 2022 | Mar 14, 2023 |
| 2021 | 4 | 4 | 0 | Dec 13, 2021 | Dec 13, 2021 |
| 2018 | 13 | 5 | 0 | Nov 29, 2018 | Feb 15, 2019 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 12 | 5 | Nov 29, 2018 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 12 | 0 | Nov 29, 2018 | Feb 16, 2026 | Results |
| pH | SU | 11 | 0 | Nov 29, 2018 | Feb 16, 2026 | Results |
| Iron, Total | mg/L | 10 | 0 | Nov 29, 2018 | Feb 16, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 6 | 1 | Jan 07, 2019 | Feb 16, 2026 | Results |
| Nitrate, Total (as N) | mg/L | 1 | 1 | Feb 16, 2026 | Feb 16, 2026 | Results |
| Nitrite, Total (as N) | mg/L | 1 | 1 | Feb 16, 2026 | Feb 16, 2026 | Results |
| Nitrogen, Total (as N) | mg/L | 1 | 1 | Feb 16, 2026 | Feb 16, 2026 | Results |
All results (54 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Iron, Total | .52 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1368616 | |
| Feb 16, 2026 | Nitrate, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1368616 | |
| Feb 16, 2026 | Nitrite Plus Nitrate (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1368616 | |
| Feb 16, 2026 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1368616 | |
| Feb 16, 2026 | Nitrogen, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NHE | 1368616 | |
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1368616 | |
| Feb 16, 2026 | pH | 8.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368616 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 9.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368616 | |
| Feb 13, 2025 | Iron, Total | .7 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327879 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .06 | mg/L | Effluent | Qualifying Storm Event | A4500NOH | 1327879 | |
| Feb 13, 2025 | Oil and Grease | 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327879 | |
| Feb 13, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1327879 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1327879 | |
| Feb 04, 2025 | Iron, Total | .33 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1324907 | |
| Feb 04, 2025 | Nitrite Plus Nitrate (as N) | .055 | mg/L | Effluent | Qualifying Storm Event | A4500NOH | 1324907 | |
| Feb 04, 2025 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1324907 | |
| Feb 04, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1324907 | |
| Feb 04, 2025 | Total Suspended Solids (TSS) | 5.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1324907 | |
| Nov 20, 2024 | Nitrite Plus Nitrate (as N) | 440 | mg/L | Effluent | Qualifying Storm Event | A4500NOH | 1317332 | |
| Nov 20, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1317332 | |
| Nov 20, 2024 | pH | 9.57 | SU | Effluent | Qualifying Storm Event | pH_Field | 1317332 | |
| Nov 20, 2024 | Total Suspended Solids (TSS) | 42 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317332 | |
| Dec 20, 2023 | Iron, Total | 1.6 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273586 | |
| Dec 20, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1273586 | |
| Dec 20, 2023 | Total Suspended Solids (TSS) | 59 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273586 | |
| Mar 14, 2023 | Iron, Total | .42 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1232707 | |
| Mar 14, 2023 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1232707 | |
| Mar 14, 2023 | pH | 8.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1232707 | |
| Mar 14, 2023 | Total Suspended Solids (TSS) | 11 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1232707 | |
| Feb 28, 2023 | Iron, Total | .95 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1230768 | |
| Feb 28, 2023 | Oil and Grease | 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1230768 | |
| Feb 28, 2023 | pH | 8.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1230768 | |
| Feb 28, 2023 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1230768 | |
| Dec 30, 2022 | Iron, Total | .42 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1221875 | |
| Dec 30, 2022 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1221875 | |
| Dec 30, 2022 | pH | 8.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1221875 | |
| Dec 30, 2022 | Total Suspended Solids (TSS) | 12 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1221875 | |
| Dec 13, 2021 | Nitrite Plus Nitrate (as N) | .047 | mg/L | Effluent | Qualifying Storm Event | A4500NOH | 1172953 | |
| Dec 13, 2021 | Oil and Grease | < 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1172953 | |
| Dec 13, 2021 | pH | 9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1172953 | |
| Dec 13, 2021 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1172953 | |
| Feb 15, 2019 | Iron, Total | 3.7 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1047525 | |
| Feb 15, 2019 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1047525 | |
| Feb 15, 2019 | pH | 6 | SU | Effluent | Qualifying Storm Event | A4500HB | 1047525 | |
| Feb 15, 2019 | Total Suspended Solids (TSS) | 85 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1047525 | |
| Jan 07, 2019 | Iron, Total | .32 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1035968 | |
| Jan 07, 2019 | Nitrite Plus Nitrate (as N) | .41 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1035968 | |
| Jan 07, 2019 | Oil and Grease | 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1035968 | |
| Jan 07, 2019 | pH | .1 | SU | Effluent | Qualifying Storm Event | A4500HB | 1035968 | |
| Jan 07, 2019 | Total Suspended Solids (TSS) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1035968 |
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 | 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 (9 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 04, 2026 | Annual reports | 1339669 | Annual report 2025 | — | |
| Jul 15, 2025 | Annual reports | 1298742 | Annual report 2024 | — | |
| Jul 11, 2024 | Annual reports | 1248043 | Annual report 2023 | — | |
| Jul 14, 2023 | Annual reports | 1194275 | Annual report 2022 | — | |
| Jun 30, 2022 | Annual reports | 1118202 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1066471 | Annual report 2020 | — | |
| Jul 10, 2020 | Annual reports | 983606 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 979576 | Annual report 2018 | — | |
| Jul 11, 2018 | Annual reports | 975128 | Annual report 2017 | — |
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.