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Cedar Hills Regional Landfill Monitoring
Read the most recent annual reports and environmental monitoring reports for the Cedar Hills Regional Landfill.
Located in Maple Valley, the Cedar Hills Regional Landfill receives over 800,000 tons of waste a year. It is the only remaining landfill in use in King County.
Cedar Hills is owned and operated by the King County Solid Waste Division. We regularly collect and analyze environmental samples to ensure we meet regulatory requirements. This includes monitoring groundwater, stormwater, and our landfill gas system.
Annual reports
Our annual reports summarize activities at Cedar Hills. This includes information on landfill capacity, operations, costs, personnel training, and environmental monitoring.
2024 annual report
- Annual report: 2024 Cedar Hills Regional Landfill annual report
- Attachment A - Municipal Solid Waste Permit
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - Annual Summary of Groundwater Monitoring Results
- Attachment G - Landfill Gas Probe Monitoring Results
- Attachment H - Stormwater Discharge Monitoring Reports
- Attachment I - Wastewater Discharge Self-Monitoring Reports
2023 annual report
- Annual report: 2023 Cedar Hills Regional Landfill annual report
- Attachment A - Operating Permits
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - Annual Summary of Groundwater Monitoring Results
- Attachment G - Landfill Monitoring Results
- Attachment H - Stormwater Reports
- Attachment I - Wastewater Discharge Self-Monitoring Reports
2022 annual report
- Annual report: 2022 Cedar Hills Regional Landfill annual report
- Attachment A - Operating Permits
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - Annual Summary of Groundwater Monitoring Results
- Attachment G - Landfill Monitoring Results
- Attachment H - Stormwater Reports
- Attachment I - Wastewater Discharge Self-Monitoring Reports
2021 annual report
- Annual report: 2021 Cedar Hills Regional Landfill annual report
- Attachment A - Operating Permits
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - 2021 Annual Summary of Groundwater Monitoring Results
- Attachment G - 2020 Landfill Monitoring Results
- Attachment H - Stormwater Reports
- Attachment I - 2020 Wastewater Discharge Self-Monitoring Reports
2020 annual report
- Annual report: 2020 Cedar Hills Regional Landfill annual report
- Attachment A - Operating Permits
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees Download
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - 2020 Annual Summary of Groundwater Monitoring Results
- Attachment G - 2020 Landfill Monitoring Results
- Attachment H - Stormwater Reports
- Attachment I - 2020 Wastewater Discharge Self-Monitoring Reports
2019 annual report
- Annual report: 2019 Cedar Hills Regional Landfill annual report
- Attachment A - Operating Permits
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Documentation
- Attachment F - 2019 Annual Summary of Groundwater Monitoring Results
- Attachment G - 2019 Landfill Gas Monitoring Results
- Attachment H - Stormwater Reporting ISGP and CSGP
- Attachment I - 2019 Wastewater Discharge Self-Monitoring Reports
2018 annual report
- Annual report: 2018 Cedar Hills Regional Landfill annual report
- Attachment A - Permit Renewal Application
- Attachment B - Tonnage Report
- Attachment C - Disposal Fees
- Attachment D - Landfill Capacity Documentation
- Attachment E - Financial Assurance Information
- Attachment F - Annual Summary of Groundwater Monitoring Results
- Attachment G - 2017 Landfill Gas Monitoring Results
- Attachment H - Stormwater Reporting ISGP and CSGP
Environmental monitoring reports
Cedar Hills Regional Landfill quarterly environmental monitoring reports.