Whale Rock Quarry
Active WDID 3 40I025440 Cayucos, San Luis Obispo County Region 3 · Central Coast
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Cayucos, San Luis Obispo County
- Region 3 · Central Coast · Location · Statewide map
- Receiving water
- Willow Creek (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
- 40 distinct results, 9 reporting years (2015 to 2025)
- Most recent sample Jan 13, 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
- 35.45137, -120.86412
- 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
- 1424 Old Creek Road, Cayucos 93430
- Regional Water Board
- 3 — Central Coast
HUC12 watershed Evidence: spatial
- Willow Creek-Frontal Pacific Ocean HUC12 180600060413
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
- Negranti Construction
- Primary industry (SIC)
- 1429-Crushed and Broken Stone, NEC
- Application ID
- 454892
- NOI processed
- May 04, 2015
- Last certified
- Jul 10, 2024
- Facility size
- 232 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 454892 | Industrial | Active | May 04, 2015 | — | Jul 10, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Willow Creek
- 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 (3)
- C2 candidate in another or unknown Regional Board
- C3 facility HUC12 not corroborated
- C4 candidate more than 5 km away
1 official waterbody shares 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.
40 distinct measurements across 4 parameters, most recent sample Jan 13, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 2 | 2 | 0 | Jan 13, 2026 | Jan 13, 2026 |
| 2023 | 2 | 2 | 0 | Feb 19, 2024 | Feb 19, 2024 |
| 2022 | 4 | 2 | 0 | Dec 30, 2022 | Feb 28, 2023 |
| 2021 | 3 | 3 | 0 | Dec 27, 2021 | Dec 27, 2021 |
| 2020 | 3 | 3 | 0 | Feb 01, 2021 | Feb 01, 2021 |
| 2019 | 5 | 3 | 0 | Dec 10, 2019 | Mar 16, 2020 |
| 2018 | 9 | 3 | 0 | Dec 05, 2018 | Mar 07, 2019 |
| 2016 | 8 | 4 | 0 | Dec 16, 2016 | Feb 16, 2017 |
| 2015 | 4 | 2 | 0 | Jan 31, 2016 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 15 | 10 | Jan 31, 2016 | Jan 13, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 15 | 3 | Jan 31, 2016 | Jan 13, 2026 | Results |
| pH | SU | 8 | 0 | Dec 16, 2016 | Dec 27, 2021 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 2 | 0 | Dec 16, 2016 | Feb 16, 2017 | Results |
All results (40 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Jan 13, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1363574 | |
| Jan 13, 2026 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1363574 | |
| Feb 19, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1279534 | |
| Feb 19, 2024 | Total Suspended Solids (TSS) | 56 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279534 | |
| Feb 28, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1231116 | |
| Feb 28, 2023 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1231116 | |
| Dec 30, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1226740 | |
| Dec 30, 2022 | Total Suspended Solids (TSS) | 19 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1226740 | |
| Dec 27, 2021 | Oil and Grease | 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1177675 | |
| Dec 27, 2021 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | A4500HB | 1177675 | |
| Dec 27, 2021 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1177675 | |
| Feb 01, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1145666 | |
| Feb 01, 2021 | pH | 7.4 | SU | Effluent | Qualifying Storm Event | A4500HB | 1145666 | |
| Feb 01, 2021 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1145666 | |
| Mar 16, 2020 | Oil and Grease | 0 | mg/L | Effluent | Qualifying Storm Event | A5220B | 1107719 | |
| Mar 16, 2020 | pH | 8.9 | SU | Effluent | Qualifying Storm Event | A4500HB | 1107719 | |
| Mar 16, 2020 | Total Suspended Solids (TSS) | 27 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1107719 | |
| Dec 10, 2019 | Oil and Grease | 0 | mg/L | Effluent | Qualifying Storm Event | A5220B | 1107719 | |
| Dec 10, 2019 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1107719 | |
| Mar 07, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1050979 | |
| Mar 07, 2019 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | A4500HB | 1050979 | |
| Mar 07, 2019 | Total Suspended Solids (TSS) | 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1050979 | |
| Jan 17, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1037622 | |
| Jan 17, 2019 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | A4500HB | 1037622 | |
| Jan 17, 2019 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1037622 | |
| Dec 05, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1034000 | |
| Dec 05, 2018 | pH | 7.3 | SU | Effluent | Qualifying Storm Event | A4500HB | 1034000 | |
| Dec 05, 2018 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1034000 | |
| Feb 16, 2017 | Electrical Conductivity @ 25 Deg. C | 23 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 929254 | |
| Feb 16, 2017 | Oil and Grease | 5.2 | mg/L | Effluent | Qualifying Storm Event | A5220B | 929254 | |
| Feb 16, 2017 | pH | 6.78 | SU | Effluent | Qualifying Storm Event | A4500HB | 929254 | |
| Feb 16, 2017 | Total Suspended Solids (TSS) | 28 | mg/L | Effluent | Qualifying Storm Event | A2540D | 929254 | |
| Dec 16, 2016 | Electrical Conductivity @ 25 Deg. C | 740 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 914190 | |
| Dec 16, 2016 | Oil and Grease | 0 | mg/L | Effluent | Qualifying Storm Event | A5220B | 914190 | |
| Dec 16, 2016 | pH | 7.67 | SU | Effluent | Qualifying Storm Event | A4500HB | 914190 | |
| Dec 16, 2016 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 914190 | |
| Mar 07, 2016 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 867066 | |
| Mar 07, 2016 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 867066 | |
| Jan 31, 2016 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 866775 | |
| Jan 31, 2016 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 866775 |
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 | 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 (11 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 07, 2026 | Annual reports | 1339269 | Annual report 2025 | — | |
| Jul 09, 2025 | Annual reports | 1298313 | Annual report 2024 | — | |
| Jul 25, 2024 | Annual reports | 1247595 | Annual report 2023 | — | |
| Jul 12, 2023 | Annual reports | 1193801 | Annual report 2022 | — | |
| Jun 29, 2022 | Annual reports | 1117675 | Annual report 2021 | — | |
| Jun 16, 2021 | Annual reports | 1065907 | Annual report 2020 | — | |
| Jul 09, 2020 | Annual reports | 983025 | Annual report 2019 | — | |
| Jul 10, 2019 | Annual reports | 959390 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 944825 | Annual report 2017 | — | |
| Jul 11, 2017 | Annual reports | 884157 | Annual report 2016 | — | |
| Jul 12, 2016 | Annual reports | 839019 | 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.