Mill Seat Landfill

Mill Seat Landfill Facts and Figures

Mill Seat Landfill is a state-of-the art solid waste management facility providing environmentally sound disposal services for residents, businesses, and institutions serving Monroe County and adjacent communities. Over 95% of the waste managed at the facility is generated within Monroe County.  Mill Seat is a non-hazardous landfi­ll, engineered with environmental protection systems that meet or exceed rigorous government regulations and are subject to highly regulated monitoring and reporting requirements. Systems include engineered liners and covers, leachate collection and removal, and landfi­ll gas collection and control.  A NYSDEC monitor is located onsite to oversee daily landfill operations.

Facts of Interest

  • Permit to Operate: New York State Department of Environmental Conservation
  • Effective: May 25, 2022 through May 26, 2032
  • Permitted Footprint Area: 216.9 acres 
  • Opening Date: May 13, 1993
  • Expected Life Span: 2050
  • Approved Design Capacity: 1,945 tons-per-day
  • Maximum Depth of Waste at Time of Completion: 190 feet
  • Renewable Energy Facility: 6.4 megawatt

Environmental Monitoring

Quarterly environmental monitoring and testing is performed under the direction of the Monroe County Department of Health. This work includes the monitoring and testing of 42 groundwater monitoring wells, six off-site homeowner wells and 10 surface water sites (2 on-site storm water retention ponds and eight sites in adjacent wetlands and Hotel Creek), leachate, air quality and noise.

Host Community Benefits

  • Annual Payments Made During Operation Years:
  • Town of Riga—minimum $450,000
  • Bergen Fire Department (Maintenance and Capital Reserve Fee)
  • Byron-Bergen Central School District to support environmental education efforts.
  • Property Value Protection Program provided for homes located in the landfill’s immediate vicinity as of its construction permit date.
  • Citizen Advisory Board (CAB) was formed to serve as liaison between the County of Monroe and the local community. The CAB meets at the landfill a minimum of four times-per-year to receive operational updates and discuss related issues.
  • Water service provided to homes near the landfill plus connection to the Bergen Water System.

For more information on the operation of Mill Seat Landfill visit: 

Picture of Mill Seat's Landfill Gas Energy FacilityMill Seat Landfill Gas Energy Facility

Monroe County has partnered with WM to operate the Mill Seat Landfill and produce and capture a renewable energy resource that will further move Monroe County towards greater energy independence. Mill Seat's Landfill Gas Energy Facility was opened in 2007 as a public/private partnership producing 6.4 megawatts of power by turning waste into watts through the utilization of methane gas generated from the landfill.

The 10,000 sq. ft., $9.5 million dollar facility houses eight Caterpillar 3516 engines. These engines can generate nearly 6.4 megawatts of energy - enough to power approximately 6,000 homes.

Energy is produced at Mill Seat following the decomposition of organic waste material located within the landfill. A unique facet of this project is the introduction of biosolids (sewage sludge) from the county’s two wastewater treatment plants to the landfill’s solid waste. The decomposition of this mixture enhances the production of methane gas, which is extracted and transported to the landfill gas energy facility through a series of wells and pipes. The gas is de-watered, filtered and pressurized at the facility, and is then piped to the generators, where the fuel turns the engines to produce electricity. Biosolids methane enhancement is achieved adding additional moisture and organics to the dry garbage. This process allowed Monroe County to end the costly and emission-producing practice of biosolids incineration--another environmental win.

Once the energy is produced at the landfill, it is released via transmission line into the New York power pool for redistribution. Utility companies then have the option to purchase this “green energy” from Mill Seat.

Mill Seat Landfill Expansion

Monroe County received all permits to construct and operate a landfill expansion and support features in May, 2017. The Mill Seat Landfill is operated by WM of New York, LLC (WMNY).

Monroe County as lead agency pursuant to the New York State Environmental Quality Review Act (6NYCRR Part 617) completed a Draft Supplemental Environmental Impact Statement (DSEIS) and held a public hearing on April 16, 2015 on the DSEIS, received written comments on the DSEIS through May 1, 2015, and completed a Final Supplemental Environmental Impact Statement (FSEIS) on a proposal to expand the Mill Seat Landfill in the Town of Riga, Monroe County, New York.

The previously permitted footprint was 98.6 acres and the expansion adds 118.3 acres of landfill footprint immediately south of the existing Mill Seat Landfill. The expansion also involves the addition of ancillary infrastructure, the abandonment of a portion of O'Brien and Brew roads, a wetland mitigation area located south of Bovee Road in the Town of Riga and a stream mitigation area in the Village of Churchville.

The DSEIS and FSEIS are available for review at the links below or in hardcopy form at the locations listed below.


  1. Executive Summary
  2. Main Document
  3. Figures
  4. Attachment A
  5. Attachment B
  6. Attachment C
  7. Attachment D
  8. Attachment E
  9. Attachment F
  10. Attachment G
  11. Attachment H
  12. Attachment I
  13. Attachment J


  1. Main Document
  2. Appendix AA
  3. Appendix BB
  4. Appendix CC Figure 23
  5. Appendix CC- Attachment G Visual Impact Assesment Report Text
  6. Appendix CC- Attachment G Visual Impact Assesment Figures 1 and 2
  7. Appendix CC- Attachment G Visual Impact Assesment Photo Rendering Point 1
  8. Appendix CC- Attachment G Visual Impact Assesment Photo Rendering Point 2
  9. Appendix CC- Attachment G Visual Impact Assesment Point 3
  10. Appendix CC- Attachment G Visual Impact Assesment Point 4
  11. Appendix CC- Attachment G Visual Impact Assesment Point 5
  12. Appendix CC- Attachment G Visual Impact Assesment Point 6
  13. Appendix CC- Attachment G Visual Impact Assesment Point 7
  14. Appendix CC- Attachment G Visual Impact Assesment Point 8
  15. Appendix CC- Attachment G Visual Impact Assesment Point 9
  16. Appendix CC- Attachment J Operating Noise Impact Assesment

Hard Copy Locations:

  • Monroe County Department of Environmental Services, CityPlace 7100, 50 W. Main Street, Rochester, NY 14614
  • Monroe County Mill Seat Landfill, 303 Brew Road, Bergen, NY 14416
  • Town of Riga, Town Hall, 6460 East Buffalo Road, Churchville, NY 14428
  • Central Library of Rochester and Monroe County, 115 South Avenue, Rochester, NY 14604
  • Newman Riga Library, 1 Village Park, Churchville, NY 14428
  • Byron-Bergen Public Library, 13 South Lake Avenue, Bergen NY 14416

Expansion Process Documents

Detailed documents pertaining to previous scoping meetings are available for public review at the Riga Town Hall. These documents are also available below: