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New York State Design Standards for Intermediate Sized Wastewater Treatment Systems

Intermediate Design Standards (2014)

The 2014 New York State Department of Environmental Conservation Design Standards for Intermediate-sized Wastewater Treatment Systems (PDF) (Intermediate Design Standards) provide wastewater treatment system design professionals, owners and operators, and regulators guidance on design, operation, and maintenance of intermediate-sized wastewater treatment facilities. This manual is a reference for both the Private/Commercial/Institutional SPDES General Permit, as well as individual permits for sanitary waste. These systems serve:

  • medium sized facilities discharging to surface and ground waters,
  • cluster housing and other multi-home developments, and
  • Publicly Owned Treatment Works (POTWs) that discharge to groundwater.

Excluded are residential systems (individual home septic systems) and large POTWs that discharge to surface waters.

The Intermediate Design Standards provide design criteria for building wastewater treatment systems that protect the water quality of groundwater and surface water, aid designers in the preparation of complete project submissions (map, plan and report), and improve the efficiency of project review by regulatory agencies. It is intended to incorporate newer technology for the onsite or near-site treatment of wastewater, as well as provide more design and installation guidance for wastewater treatment facilities. These developments have arisen from special needs, including the replacement of failing systems on limited-sized sites, lighter-weight construction materials, lower-cost sewage collection and treatment for remote or isolated locations, and special considerations for environmentally sensitive areas.

Lake George Design Standards for Wastewater Treatment Systems (2015)

The 2015 Design Standards for Wastewater Treatment Systems in the Lake George Basin (PDF) are only applicable in the Lake George Basin for treated sanitary sewage discharging to groundwater without admixture of industrial wastes.


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