Clover Flat Landfill
Active WDID 2 28I000731 Calistoga, 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
- Calistoga, 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
- None
- Monitoring results Evidence: facility-reported
- 1,607 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Nov 05, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 4 inspections · 3 violation records · 3 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
- 38.57609, -122.53035
- 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
- 4380 Silverado Trl, Calistoga 94515
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Upper Napa River HUC12 180500020201
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
- Clover Flat Landfill
- Primary industry (SIC)
- 4953-Refuse Systems
- Application ID
- 182389
- NOI processed
- Mar 19, 1992
- Last certified
- Feb 12, 2025
- Facility size
- 118 Acres
- Impervious area
- 4.5 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 182389 | Industrial | Active | Mar 19, 1992 | — | Feb 12, 2025 |
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.
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.
1,607 distinct measurements across 18 parameters, most recent sample Nov 05, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 28 | 7 | 0 | Nov 05, 2025 | Nov 05, 2025 |
| 2024 | 147 | 7 | 0 | Nov 20, 2024 | Mar 12, 2025 |
| 2023 | 140 | 8 | 0 | Dec 18, 2023 | Mar 29, 2024 |
| 2022 | 320 | 10 | 0 | Dec 30, 2022 | Mar 10, 2023 |
| 2021 | 210 | 10 | 0 | Nov 09, 2021 | Dec 13, 2021 |
| 2020 | 144 | 9 | 0 | Jan 06, 2021 | Mar 10, 2021 |
| 2019 | 269 | 14 | 0 | Dec 04, 2019 | May 18, 2020 |
| 2018 | 119 | 12 | 0 | Nov 27, 2018 | Mar 27, 2019 |
| 2017 | 48 | 12 | 0 | Jan 09, 2018 | Jan 24, 2018 |
| 2016 | 92 | 17 | 0 | Oct 28, 2016 | Mar 21, 2017 |
| 2015 | 90 | 14 | 0 | Dec 03, 2015 | Mar 04, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Iron, Total | mg/L | 170 | 0 | Dec 03, 2015 | Nov 05, 2025 | Results |
| Oil and Grease | mg/L | 170 | 161 | Dec 03, 2015 | Nov 05, 2025 | Results |
| pH | SU | 170 | 0 | Dec 03, 2015 | Nov 05, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 169 | 7 | Dec 03, 2015 | Nov 05, 2025 | Results |
| Zinc, Total | mg/L | 159 | 27 | Dec 03, 2015 | Nov 05, 2025 | Results |
| Aluminum, Total | mg/L | 158 | 1 | Feb 17, 2017 | Nov 05, 2025 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 141 | 13 | Dec 03, 2015 | Nov 05, 2025 | Results |
| Phosphorus, Total (as P) | mg/L | 125 | 20 | Dec 03, 2015 | Mar 10, 2023 | Results |
| Lead, Total | mg/L | 113 | 38 | Feb 17, 2017 | Mar 10, 2023 | Results |
| Chemical Oxygen Demand (COD) | mg/L | 99 | 36 | Dec 03, 2015 | Mar 10, 2023 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 44 | 0 | Dec 03, 2015 | Jan 16, 2020 | Results |
| Nitrate, Total (as N) | mg/L | 25 | 3 | Dec 03, 2015 | Dec 18, 2019 | Results |
Show 6 more parameters
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Nitrite, Total (as N) | mg/L | 22 | 16 | Dec 15, 2016 | Dec 18, 2019 | Results |
| Aluminum, Total Recoverable | ug/L | 12 | 1 | Dec 03, 2015 | Dec 15, 2016 | Results |
| Lead, Total Recoverable | ug/L | 12 | 0 | Dec 03, 2015 | Dec 15, 2016 | Results |
| Zinc, Total Recoverable | ug/L | 11 | 0 | Dec 03, 2015 | Dec 15, 2016 | Results |
| Nitrogen, Total (as N) | mg/L | 6 | 0 | Dec 10, 2015 | Jan 16, 2020 | Results |
| Total Suspended Solids (TSS), Net Value | mg/L | 1 | 0 | Mar 29, 2024 | Mar 29, 2024 | Results |
All results (1,607 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Nov 05, 2025 | Aluminum, Total | 1.5 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Aluminum, Total | 2.8 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Aluminum, Total | DNQ .013 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Aluminum, Total | 3.2 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Iron, Total | 3.2 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Iron, Total | 6.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Iron, Total | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Iron, Total | 7.1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Nitrite Plus Nitrate (as N) | 2.5 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1357727 | |
| Nov 05, 2025 | Nitrite Plus Nitrate (as N) | 4 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1357727 | |
| Nov 05, 2025 | Nitrite Plus Nitrate (as N) | 3.2 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1357727 | |
| Nov 05, 2025 | Nitrite Plus Nitrate (as N) | 1.4 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1357727 | |
| Nov 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357727 | |
| Nov 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357727 | |
| Nov 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357727 | |
| Nov 05, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1357727 | |
| Nov 05, 2025 | pH | 8.04 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357727 | |
| Nov 05, 2025 | pH | 8.09 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357727 | |
| Nov 05, 2025 | pH | 7.59 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357727 | |
| Nov 05, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357727 | |
| Nov 05, 2025 | Total Suspended Solids (TSS) | 57 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357727 | |
| Nov 05, 2025 | Total Suspended Solids (TSS) | 133 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357727 | |
| Nov 05, 2025 | Total Suspended Solids (TSS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357727 | |
| Nov 05, 2025 | Total Suspended Solids (TSS) | 149 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357727 | |
| Nov 05, 2025 | Zinc, Total | DNQ .013 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Zinc, Total | .028 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Zinc, Total | DNQ .0079 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Nov 05, 2025 | Zinc, Total | .04 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1357727 | |
| Mar 12, 2025 | Aluminum, Total | .66 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Aluminum, Total | 11 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Aluminum, Total | 19 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Aluminum, Total | 20 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Aluminum, Total | 2.4 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Iron, Total | 1.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Iron, Total | 39 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Iron, Total | 45 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Iron, Total | 45 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Iron, Total | 4.8 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327380 | |
| Mar 12, 2025 | Nitrite Plus Nitrate (as N) | .24 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1327380 | |
| Mar 12, 2025 | Nitrite Plus Nitrate (as N) | .19 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1327380 | |
| Mar 12, 2025 | Nitrite Plus Nitrate (as N) | 1.1 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1327380 | |
| Mar 12, 2025 | Nitrite Plus Nitrate (as N) | .64 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1327380 | |
| Mar 12, 2025 | Nitrite Plus Nitrate (as N) | .86 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1327380 | |
| Mar 12, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327380 | |
| Mar 12, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327380 | |
| Mar 12, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327380 | |
| Mar 12, 2025 | Oil and Grease | DNQ 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327380 | |
| Mar 12, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327380 | |
| Mar 12, 2025 | pH | 6.32 | SU | Effluent | Qualifying Storm Event | pH_Field | 1327380 | |
| Mar 12, 2025 | pH | 6.08 | SU | Effluent | Qualifying Storm Event | pH_Field | 1327380 |
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 | 3 | 2 Violation · 0 Potential (preliminary) · 1 Dismissed | Aug 05, 2005 – Jul 15, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 2 issued · 1 draft · 0 withdrawn, rescinded or superseded | Aug 05, 2005 – Jan 26, 2023 | Oct 21, 2026 | All actions |
| Inspections | 4 | inspections, not findings | Dec 14, 2006 – Feb 27, 2024 | 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 (21 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 29, 2026 | Annual reports | 1337270 | Annual report 2025 | — | |
| Jun 27, 2025 | Annual reports | 1296174 | Annual report 2024 | — | |
| Jul 12, 2024 | Annual reports | 1245369 | Annual report 2023 | — | |
| Feb 27, 2024 | Inspections | 2064833 | B Type compliance | Performed | No Further Action |
| Jul 13, 2023 | Annual reports | 1191475 | Annual report 2022 | — | |
| Jan 26, 2023 | Enforcement actions | 448725 | ACL (Administrative Civil Liability) | Historical | R2-2022-1018 |
| Jul 11, 2022 | Annual reports | 1115041 | Annual report 2021 | — | |
| Oct 21, 2021 | Enforcement actions | 441826 | NNC (Notice of Non-Compliance) | Active | |
| Jul 29, 2021 | Annual reports | 1063133 | Annual report 2020 | — | |
| Jul 15, 2021 | Violations | 877925 | Late Report | Violation | Report |
| Oct 22, 2020 | Inspections | 2051303 | B Type compliance | Finalized | No Further Action |
| Jul 13, 2020 | Annual reports | 980005 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 956257 | Annual report 2018 | — | |
| Mar 26, 2019 | Violations | 883766 | Unauthorized NSWD | Violation | Inspection |
| Apr 23, 2018 | Annual reports | 941684 | Annual report 2017 | — | |
| Jun 13, 2017 | Annual reports | 881082 | Annual report 2016 | — | |
| Jun 06, 2016 | Annual reports | 847022 | Annual report 2015 | — | |
| Mar 21, 2016 | Inspections | 2029354 | Inspection from Vehicle | — | Additional Info Required |
| Dec 14, 2006 | Inspections | 962755 | B Type compliance | — | No Further Action |
| Aug 05, 2005 | Enforcement actions | 310610 | NNC (Notice of Non-Compliance) | Draft | 97-03DWQ |
| Aug 05, 2005 | Violations | 434612 | Late Report | Dismissed | Report |
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.