Crown Hill Stone Supply LLC
Active WDID 2 28I028169 American Canyon, Napa 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
- American Canyon, Napa County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Napa River (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
- 1 waterbody; 0 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 44 distinct results, 6 reporting years (2019 to 2025)
- Most recent sample Feb 23, 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
- 38.19627, -122.26602
- 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
- 650 Green Island Road, American Canyon 94503
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- American Canyon Creek-Frontal San Pablo Bay Estuaries HUC12 180500020401
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
- Crown Hill Stone Supply LLC
- Primary industry (SIC)
- 3273-Ready-Mixed Concrete
- Secondary SIC
- 3272-Concrete Products, Except Block and Brick
- Application ID
- 508900
- NOI processed
- May 15, 2019
- Last certified
- May 13, 2019
- Facility size
- 6 Acres
- Impervious area
- 10 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 508900 | Industrial | Active | May 15, 2019 | — | May 13, 2019 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Napa River
- 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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| North Slough (Napa County) CAR2065008020110829151118 | 397 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.
44 distinct measurements across 4 parameters, most recent sample Feb 23, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 8 | 4 | 0 | Nov 18, 2025 | Feb 23, 2026 |
| 2024 | 8 | 4 | 0 | Nov 22, 2024 | Feb 01, 2025 |
| 2023 | 8 | 4 | 0 | Dec 20, 2023 | Feb 01, 2024 |
| 2022 | 9 | 4 | 2 | Dec 03, 2022 | Feb 27, 2023 |
| 2020 | 8 | 4 | 0 | Jan 27, 2021 | Mar 09, 2021 |
| 2019 | 4 | 4 | 0 | Dec 18, 2019 | Dec 18, 2019 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Iron, Total Recoverable | mg/L | 11 | 8 | Dec 18, 2019 | Feb 23, 2026 | Results |
| Oil and Grease | mg/L | 11 | 7 | Dec 18, 2019 | Feb 23, 2026 | Results |
| pH | SU | 11 | 0 | Dec 18, 2019 | Feb 23, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 11 | 8 | Dec 18, 2019 | Feb 23, 2026 | Results |
All results (45 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 23, 2026 | Iron, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1370137 | |
| Feb 23, 2026 | Oil and Grease | ND 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1370137 | |
| Feb 23, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1370137 | |
| Feb 23, 2026 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1370137 | |
| Nov 18, 2025 | Iron, Total Recoverable | .0025 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1360828 | |
| Nov 18, 2025 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1360828 | |
| Nov 18, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1360828 | |
| Nov 18, 2025 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360828 | |
| Feb 01, 2025 | Iron, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1326646 | |
| Feb 01, 2025 | Oil and Grease | ND 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1326646 | |
| Feb 01, 2025 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1326646 | |
| Feb 01, 2025 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1326646 | |
| Nov 22, 2024 | Iron, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1319972 | |
| Nov 22, 2024 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1319972 | |
| Nov 22, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1319972 | |
| Nov 22, 2024 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1319972 | |
| Feb 01, 2024 | Iron, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280089 | |
| Feb 01, 2024 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1280089 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1280089 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1280089 | |
| Dec 20, 2023 | Iron, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273400 | |
| Dec 20, 2023 | Oil and Grease | ND 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1273400 | |
| Dec 20, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1273400 | |
| Dec 20, 2023 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273400 | |
| Feb 27, 2023 | Iron, Total Recoverable | ND .05 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1232738 | |
| Feb 27, 2023 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1232738 | |
| Feb 27, 2023 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | A4500HB | 1232738 | 2 versions |
| Feb 27, 2023 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1232738 | 2 versions |
| Feb 27, 2023 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1232738 | |
| Dec 03, 2022 | Iron, Total Recoverable | ND .05 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1224171 | |
| Dec 03, 2022 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1224171 | |
| Dec 03, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1224171 | |
| Dec 03, 2022 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1224171 | |
| Mar 09, 2021 | Iron, Total Recoverable | ND .05 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1148023 | |
| Mar 09, 2021 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1148023 | |
| Mar 09, 2021 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1148023 | |
| Mar 09, 2021 | Total Suspended Solids (TSS) | .4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1148023 | |
| Jan 27, 2021 | Iron, Total Recoverable | 1.3 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1145613 | |
| Jan 27, 2021 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1145613 | |
| Jan 27, 2021 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1145613 | |
| Jan 27, 2021 | Total Suspended Solids (TSS) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1145613 | |
| Dec 18, 2019 | Iron, Total Recoverable | 4.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1099567 | |
| Dec 18, 2019 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1099567 | |
| Dec 18, 2019 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1099567 | |
| Dec 18, 2019 | Total Suspended Solids (TSS) | 33 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1099567 |
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 | 8 | certified reports (contents not shown) | 2018 – 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 (8 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 04, 2026 | Annual reports | 1339846 | Annual report 2025 | — | |
| Jun 16, 2025 | Annual reports | 1298927 | Annual report 2024 | — | |
| Jun 17, 2024 | Annual reports | 1248227 | Annual report 2023 | — | |
| Jun 12, 2023 | Annual reports | 1194473 | Annual report 2022 | — | |
| Jul 05, 2022 | Annual reports | 1118421 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1070959 | Annual report 2020 | — | |
| Jun 18, 2020 | Annual reports | 1071661 | Annual report 2019 | — | |
| Jun 28, 2019 | Annual reports | 1057467 | 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.