Mill Seat Landfill

Mill Seat Landfill Facts and Figures

Permit to Operate: New York State Department of Environmental Conservation
Effective: July 19, 2011 through July 31, 2021
Permitted Footprint Area: 95 acres of a 615-acre site

Facts of Interest

  • Opening Date: May 13, 1993
  • Expected Life Span: 2018
  • Approved Design Capacity: 1,945 tons-per-day
  • Total Air Space (95 Acres): 12.6 million cubic yards (Design); 14.5 million cubic yards (Modified)
  • Maximum Depth of Waste at Time of Completion: 190 feet
  • Leachate Storage: 1.5 to 2 million-gallon capacity in glass-lined, above ground storage tanks
  • Construction Costs: $35 million for Stages I and II (not including design, testing, land acquisition and supervision).

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.

Learn more about the Mill Seat Landfill.

Mill Seat Landfill Gas Energy Facility

Monroe County has partnered with Waste Management 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.

Proposed Mill Seat Landfill Expansion

Monroe County is seeking a Permit Modification from the New York State Department of Environmental Conservation to construct and operate a landfill expansion and support features. The Mill Seat Landfill is operated by Waste Management of New York, LLC (WMNY).

The current permitted Mill Seat Landfill and associated operations occupy 435 acres owned by the County, which includes the double composite lined Landfill Footprint and ancillary facilities (roads, buildings, soil borrow areas, stormwater ponds, etc.). The current permitted Landfill Footprint occupies 98.6 acres and is estimated to reach capacity by 2018.

Monroe County as lead agency pursuant to the New York State Environmental Quality Review Act (6NYCRR Part 617) has 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 proposal involves the expansion of the existing 98.6 acre permitted footprint of the Mill Seat Landfill with an additional 118.3 acre expansion immediately south of the existing Mill Seat Landfill. The proposal 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 by clicking here or in hardcopy form at the following 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:

MSL Expansion Environmental Review Process

MSL Environmental Assessment Form

MSL Draft Scoping Document

MSL Positive Declaration

MSL Final Scoping Document

MSL DSEIS Completion Notice - SEQR Hearing Notice - Public Comment Period

MSL FSEIS Completion Notice

MSL SEQR Findings Statement


MSL Proposed Expansion

MSL Soil Borrow Areas

MSL Property Protection Plan

  print this page    email this page    back to top

About · Accessibility and Standards · RSS News Feed
Disclaimer and Privacy Policy · Non-Discrimination Policy

Official Site of Monroe County, New York. Copyright © 2015 Monroe County. All Rights Reserved.
Comments or suggestions? Please e-mail the webmaster.

Get Adobe Reader free from