Hillside Class III Disposal Site
Active WDID 2 41I000683 Colma, San Mateo 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
- Colma, San Mateo County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- Colma Creek (as reported by the facility)
- Evidence: identification corroborated Colma Creek Details
- Identified receiving water on the 2026 303(d) list
- Yes · 1 Appendix A decision, category 4b Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- None
- Monitoring results Evidence: facility-reported
- 138 distinct results, 3 reporting years (2015 to 2023)
- Most recent sample Feb 01, 2024 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 1 violation record · 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
- 37.6804, -122.44351
- Precision
- 4 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
- 1 Sand Hill Road, Colma 94014
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Colma Creek-Frontal San Francisco Bay Estuaries HUC12 180500040903
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
- Cypress Amloc Land Co Inc
- Primary industry (SIC)
- 4953-Refuse Systems
- Application ID
- 182842
- NOI processed
- Mar 18, 1992
- Last certified
- Jul 14, 2018
- Facility size
- 43 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 182842 | Industrial | Active | Mar 18, 1992 | — | Jul 14, 2018 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Colma Creek
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: identification corroborated Colma Creek CAR2044002020080624163112
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 1.3 km. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Colma Creek is on the 2026 Clean Water Act section 303(d) list (1 Appendix A decision; category 4b).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Trash | 4b | Do Not Delist from 303(d) list (being addressed with action other than TMDL) | 5C | 87612 |
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.
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.
138 distinct measurements across 11 parameters, most recent sample Feb 01, 2024.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2023 | 30 | 10 | 0 | Dec 22, 2023 | Feb 01, 2024 |
| 2016 | 66 | 11 | 0 | Dec 12, 2016 | Feb 17, 2017 |
| 2015 | 42 | 11 | 0 | Jan 11, 2016 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Chloride | mg/L | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Oil and Grease | mg/L | 13 | 13 | Jan 11, 2016 | Feb 01, 2024 | Results |
| pH | SU | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Sulfate, Total (as SO4) | mg/L | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Total Dissolved Solids (TDS) | mg/L | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Total Kjeldahl Nitrogen (TKN) (as N) | mg/L | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Total Organic Carbon (TOC) | mg/L | 13 | 0 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Total Suspended Solids (TSS) | mg/L | 13 | 2 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Volatile Organic Compounds (VOCs) | ug/L | 13 | 13 | Jan 11, 2016 | Feb 01, 2024 | Results |
| Iron, Total | mg/L | 11 | 0 | Mar 07, 2016 | Feb 01, 2024 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 10 | 0 | Jan 11, 2016 | Feb 17, 2017 | Results |
All results (138 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 01, 2024 | Chloride | 36 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Feb 01, 2024 | Iron, Total | 2.9 | mg/L | Effluent | Non-Qualifying Storm Event | E200.8 | 1287214 | |
| Feb 01, 2024 | Oil and Grease | ND | mg/L | Effluent | Non-Qualifying Storm Event | E1664B | 1287214 | |
| Feb 01, 2024 | pH | 7.84 | SU | Effluent | Non-Qualifying Storm Event | A4500HB | 1287214 | |
| Feb 01, 2024 | Sulfate, Total (as SO4) | 49 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Feb 01, 2024 | Total Dissolved Solids (TDS) | 370 | mg/L | Effluent | Non-Qualifying Storm Event | A2540C | 1287214 | |
| Feb 01, 2024 | Total Kjeldahl Nitrogen (TKN) (as N) | .52 | mg/L | Effluent | Non-Qualifying Storm Event | E351.2 | 1287214 | |
| Feb 01, 2024 | Total Organic Carbon (TOC) | 8.6 | mg/L | Effluent | Non-Qualifying Storm Event | A5310C | 1287214 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 36 | mg/L | Effluent | Non-Qualifying Storm Event | A2540D | 1287214 | |
| Feb 01, 2024 | Volatile Organic Compounds (VOCs) | ND | ug/L | Effluent | Non-Qualifying Storm Event | E624.1 | 1287214 | |
| Dec 22, 2023 | Chloride | 56 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Dec 22, 2023 | Chloride | 9.1 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Dec 22, 2023 | Iron, Total | 3.2 | mg/L | Effluent | Non-Qualifying Storm Event | E200.8 | 1287214 | |
| Dec 22, 2023 | Iron, Total | 25 | mg/L | Effluent | Non-Qualifying Storm Event | E200.8 | 1287214 | |
| Dec 22, 2023 | Oil and Grease | ND | mg/L | Effluent | Non-Qualifying Storm Event | E1664B | 1287214 | |
| Dec 22, 2023 | Oil and Grease | ND | mg/L | Effluent | Non-Qualifying Storm Event | E1664B | 1287214 | |
| Dec 22, 2023 | pH | 8.37 | SU | Effluent | Non-Qualifying Storm Event | A4500HB | 1287214 | |
| Dec 22, 2023 | pH | 7.98 | SU | Effluent | Non-Qualifying Storm Event | A4500HB | 1287214 | |
| Dec 22, 2023 | Sulfate, Total (as SO4) | 34 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Dec 22, 2023 | Sulfate, Total (as SO4) | 17 | mg/L | Effluent | Non-Qualifying Storm Event | E300.0 | 1287214 | |
| Dec 22, 2023 | Total Dissolved Solids (TDS) | 350 | mg/L | Effluent | Non-Qualifying Storm Event | A2540C | 1287214 | |
| Dec 22, 2023 | Total Dissolved Solids (TDS) | 220 | mg/L | Effluent | Non-Qualifying Storm Event | A2540C | 1287214 | |
| Dec 22, 2023 | Total Kjeldahl Nitrogen (TKN) (as N) | .4 | mg/L | Effluent | Non-Qualifying Storm Event | E351.2 | 1287214 | |
| Dec 22, 2023 | Total Kjeldahl Nitrogen (TKN) (as N) | .93 | mg/L | Effluent | Non-Qualifying Storm Event | E351.2 | 1287214 | |
| Dec 22, 2023 | Total Organic Carbon (TOC) | 5.5 | mg/L | Effluent | Non-Qualifying Storm Event | A5310C | 1287214 | |
| Dec 22, 2023 | Total Organic Carbon (TOC) | 11 | mg/L | Effluent | Non-Qualifying Storm Event | A5310C | 1287214 | |
| Dec 22, 2023 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Non-Qualifying Storm Event | A2540D | 1287214 | |
| Dec 22, 2023 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Non-Qualifying Storm Event | A2540D | 1287214 | |
| Dec 22, 2023 | Volatile Organic Compounds (VOCs) | ND | ug/L | Effluent | Non-Qualifying Storm Event | E624.1 | 1287214 | |
| Dec 22, 2023 | Volatile Organic Compounds (VOCs) | ND | ug/L | Effluent | Non-Qualifying Storm Event | E624.1 | 1287214 | |
| Feb 17, 2017 | Chloride | 66 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 927091 | |
| Feb 17, 2017 | Chloride | 17 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 927091 | |
| Feb 17, 2017 | Electrical Conductivity @ 25 Deg. C | 749 | umhos/cm | Effluent | Qualifying Storm Event | E120.1 | 927091 | |
| Feb 17, 2017 | Electrical Conductivity @ 25 Deg. C | 308 | umhos/cm | Effluent | Qualifying Storm Event | E120.1 | 927091 | |
| Feb 17, 2017 | Iron, Total | 1.9 | mg/L | Effluent | Qualifying Storm Event | A3111C | 927091 | |
| Feb 17, 2017 | Iron, Total | .58 | mg/L | Effluent | Qualifying Storm Event | A3111C | 927091 | |
| Feb 17, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 927091 | |
| Feb 17, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 927091 | |
| Feb 17, 2017 | pH | 7.88 | SU | Effluent | Qualifying Storm Event | A4500HB | 927091 | |
| Feb 17, 2017 | pH | 8.6 | SU | Effluent | Qualifying Storm Event | A4500HB | 927091 | |
| Feb 17, 2017 | Sulfate, Total (as SO4) | 84 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 927091 | |
| Feb 17, 2017 | Sulfate, Total (as SO4) | 46 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 927091 | |
| Feb 17, 2017 | Total Dissolved Solids (TDS) | 470 | mg/L | Effluent | Qualifying Storm Event | A2540C | 927091 | |
| Feb 17, 2017 | Total Dissolved Solids (TDS) | 200 | mg/L | Effluent | Qualifying Storm Event | A2540C | 927091 | |
| Feb 17, 2017 | Total Kjeldahl Nitrogen (TKN) (as N) | .66 | mg/L | Effluent | Qualifying Storm Event | E351.2 | 927091 | |
| Feb 17, 2017 | Total Kjeldahl Nitrogen (TKN) (as N) | .49 | mg/L | Effluent | Qualifying Storm Event | E351.2 | 927091 | |
| Feb 17, 2017 | Total Organic Carbon (TOC) | 9.4 | mg/L | Effluent | Qualifying Storm Event | A5310C | 927091 | |
| Feb 17, 2017 | Total Organic Carbon (TOC) | 4.4 | mg/L | Effluent | Qualifying Storm Event | A5310C | 927091 | |
| Feb 17, 2017 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 927091 | |
| Feb 17, 2017 | Total Suspended Solids (TSS) | 8.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 927091 |
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 | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Jul 02, 1999 | Oct 21, 2026 | All violations |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | Oct 19, 2009 – Oct 19, 2009 | 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 (13 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| May 20, 2026 | Annual reports | 1335154 | Annual report 2025 | — | |
| Jun 18, 2025 | Annual reports | 1293957 | Annual report 2024 | — | |
| Jun 05, 2024 | Annual reports | 1243034 | Annual report 2023 | — | |
| Jun 22, 2023 | Annual reports | 1189027 | Annual report 2022 | — | |
| Jun 10, 2022 | Annual reports | 1112384 | Annual report 2021 | — | |
| Jun 02, 2021 | Annual reports | 1068388 | Annual report 2020 | — | |
| Jun 08, 2020 | Annual reports | 985624 | Annual report 2019 | — | |
| Jun 24, 2019 | Annual reports | 953164 | Annual report 2018 | — | |
| Aug 24, 2018 | Annual reports | 938580 | Annual report 2017 | — | |
| Jun 11, 2017 | Annual reports | 877804 | Annual report 2016 | — | |
| Jun 27, 2016 | Annual reports | 840183 | Annual report 2015 | — | |
| Oct 19, 2009 | Inspections | 2001827 | B Type compliance | — | Additional Info Required |
| Jul 02, 1999 | Violations | 137362 | 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.