Grass Valley
Active WDID 5S29I001343 Grass Valley, Nevada County Region 5S · Central Valley (Sacramento)
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Grass Valley, Nevada County
- Region 5S · Central Valley (Sacramento) · Location · Statewide map
- 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
- 179 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Apr 01, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 5 inspections · 2 violation records · 1 enforcement action
- 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
- 39.19025, -121.05042
- 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
- 11825 La Barr Meadows Rd, Grass Valley 95945
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Rattlesnake Creek-Wolf Creek HUC12 180201260202
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
- CalMat Co dba Vulcan Materials Co
- Primary industry (SIC)
- 2951-Asphalt Paving Mixtures and Blocks
- Application ID
- 198624
- NOI processed
- Mar 27, 1992
- Last certified
- Dec 17, 2025
- Facility size
- 3 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 198624 | Industrial | Active | Mar 27, 1992 | — | Dec 17, 2025 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Critter Creek
- 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 |
|---|---|---|---|
| Wolf Creek (Nevada County) CAR5163201020011212113551 | 817 m | listed | 1 |
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.
179 distinct measurements across 3 parameters, most recent sample Apr 01, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 27 | 3 | 0 | Oct 14, 2025 | Apr 01, 2026 |
| 2024 | 18 | 3 | 0 | Nov 21, 2024 | Apr 07, 2025 |
| 2023 | 6 | 3 | 0 | Dec 19, 2023 | Dec 19, 2023 |
| 2022 | 18 | 3 | 0 | Nov 07, 2022 | Mar 28, 2023 |
| 2021 | 30 | 3 | 0 | Nov 04, 2021 | Mar 15, 2022 |
| 2020 | 27 | 3 | 0 | Nov 17, 2020 | Jan 27, 2021 |
| 2019 | 6 | 3 | 0 | Sep 16, 2019 | Sep 16, 2019 |
| 2018 | 18 | 3 | 0 | Nov 28, 2018 | Feb 26, 2019 |
| 2017 | 23 | 3 | 0 | Nov 27, 2017 | Mar 08, 2018 |
| 2016 | 3 | 3 | 0 | Oct 28, 2016 | Oct 28, 2016 |
| 2015 | 3 | 3 | 0 | Apr 22, 2016 | Apr 22, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 60 | 49 | Apr 22, 2016 | Apr 01, 2026 | Results |
| pH | SU | 60 | 0 | Apr 22, 2016 | Apr 01, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 59 | 0 | Apr 22, 2016 | Apr 01, 2026 | Results |
All results (179 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 01, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1371296 | |
| Apr 01, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1371296 | |
| Apr 01, 2026 | pH | 6.88 | SU | Effluent | Qualifying Storm Event | pH_Field | 1371296 | |
| Apr 01, 2026 | pH | 7.24 | SU | Effluent | Qualifying Storm Event | pH_Field | 1371296 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 14.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371296 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 6.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371296 | |
| Feb 24, 2026 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367958 | |
| Feb 24, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367958 | |
| Feb 24, 2026 | pH | 7.12 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367958 | |
| Feb 24, 2026 | pH | 6.98 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367958 | |
| Feb 24, 2026 | Total Suspended Solids (TSS) | 4.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367958 | |
| Feb 24, 2026 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367958 | |
| Dec 17, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361862 | |
| Dec 17, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361870 | |
| Dec 17, 2025 | pH | 7.08 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361862 | |
| Dec 17, 2025 | pH | 6.81 | SU | Effluent | Qualifying Storm Event | pH_Field | 1361870 | |
| Dec 17, 2025 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361862 | |
| Dec 17, 2025 | Total Suspended Solids (TSS) | 17 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361870 | |
| Nov 13, 2025 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357499 | |
| Nov 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357499 | |
| Nov 13, 2025 | pH | 6.75 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357499 | |
| Nov 13, 2025 | pH | 6.92 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357499 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 100 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357499 | |
| Nov 13, 2025 | Total Suspended Solids (TSS) | 50 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357499 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355978 | |
| Oct 14, 2025 | pH | 6.86 | SU | Effluent | Qualifying Storm Event | pH_Field | 1355978 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 48.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355978 | |
| Apr 07, 2025 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329224 | |
| Apr 07, 2025 | Oil and Grease | 2.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329224 | |
| Apr 07, 2025 | pH | 7.13 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329224 | |
| Apr 07, 2025 | pH | 6.72 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329224 | |
| Apr 07, 2025 | Total Suspended Solids (TSS) | 36.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329224 | |
| Apr 07, 2025 | Total Suspended Solids (TSS) | 22 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329224 | |
| Mar 31, 2025 | Oil and Grease | 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329157 | |
| Mar 31, 2025 | Oil and Grease | 1.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1329157 | |
| Mar 31, 2025 | pH | 6.69 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329157 | |
| Mar 31, 2025 | pH | 6.73 | SU | Effluent | Qualifying Storm Event | pH_Field | 1329157 | |
| Mar 31, 2025 | Total Suspended Solids (TSS) | 38 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329157 | |
| Mar 31, 2025 | Total Suspended Solids (TSS) | 13.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1329157 | |
| Nov 21, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1317330 | |
| Nov 21, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1317330 | |
| Nov 21, 2024 | pH | 6.76 | SU | Effluent | Qualifying Storm Event | pH_Field | 1317330 | |
| Nov 21, 2024 | pH | 6.97 | SU | Effluent | Qualifying Storm Event | pH_Field | 1317330 | |
| Nov 21, 2024 | Total Suspended Solids (TSS) | 22.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317330 | |
| Nov 21, 2024 | Total Suspended Solids (TSS) | 10.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1317330 | |
| Dec 19, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1272062 | |
| Dec 19, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1272062 | |
| Dec 19, 2023 | pH | 6.94 | SU | Effluent | Qualifying Storm Event | pH_Field | 1272062 | |
| Dec 19, 2023 | pH | 6.76 | SU | Effluent | Qualifying Storm Event | pH_Field | 1272062 | |
| Dec 19, 2023 | Total Suspended Solids (TSS) | 40 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1272062 |
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 | 2 | 2 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Jan 01, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Mar 12, 2021 – Mar 12, 2021 | Oct 21, 2026 | All actions |
| Inspections | 5 | inspections, not findings | Sep 25, 2013 – Aug 10, 2023 | 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 (19 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 09, 2026 | Annual reports | 1337307 | Annual report 2025 | — | |
| Jul 15, 2025 | Annual reports | 1296214 | Annual report 2024 | — | |
| Jul 05, 2024 | Annual reports | 1245411 | Annual report 2023 | — | |
| Aug 10, 2023 | Inspections | 2061381 | B Type compliance | Performed | Additional Info Required |
| Jul 14, 2023 | Annual reports | 1191518 | Annual report 2022 | — | |
| Jun 30, 2022 | Annual reports | 1115089 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1063181 | Annual report 2020 | — | |
| Mar 12, 2021 | Enforcement actions | 440395 | NOV (Notice of Violation) | Active | |
| Jan 01, 2021 | Violations | 876666 | Late Report | Violation | Report |
| Jul 10, 2020 | Annual reports | 980054 | Annual report 2019 | — | |
| Oct 15, 2019 | Inspections | 2044824 | B Type compliance | — | Additional Info Required |
| Jul 12, 2019 | Annual reports | 956307 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 941734 | Annual report 2017 | — | |
| Jul 12, 2017 | Annual reports | 881134 | Annual report 2016 | — | |
| Jun 08, 2017 | Inspections | 2034216 | B Type compliance | — | No Further Action |
| Jul 15, 2016 | Annual reports | 841791 | Annual report 2015 | — | |
| Aug 26, 2015 | Inspections | 2026677 | B Type compliance | — | Additional Info Required |
| Sep 25, 2013 | Inspections | 2019962 | B Type compliance | — | No Further Action |
| Jul 02, 1999 | Violations | 167910 | Deficient Report | Violation | Inspection |
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.