Environmental engineers review and permit every subdivision plan and new subsurface sewage treatment system (SSTS) for commercial and residential use to ensure that there is adequate sewage disposal and drinking water. They perform field site visits throughout the construction phase to verify that the plans are being followed.

Read more about septic system repair, operation and maintenance.

On-Site Wastewater Treatment System (aka Septic System) and/or Well Applications Regulations

Effective April 1, 2022: Westchester County Health Department Rules and Regulations for the Design and Construction of Residential Subsurface Sewage Treatment System

Westchester County Sanitary Code

Policy and Design Guidance

Forms for Septic and Wells 

Requests for Inspections


Change of Use

Realty Subdivision Applications

Regulations for Westchester County Sanitary Code:


Forms for Realty Subdivision

Record Searches
If you are only seeking information about complaints or recent violations about a septic system, then provide the street address and send a record request to foil-doh@WestchesterCountyNY.gov. Requests for the full septic system records are handled as follows:

  • Search requests for an approved septic system on a given property are made by completing the sketch request form. Print out and fax to (914) 864-7341. In order for the Department of perform a record search, the required information sited on the form must be provided. Without this information, we cannot conduct a search. Please note that the majority of Municipalities have changed section, block and lot numbers; please contact the tax assessor's office to obtain this information.

Remember to provide a daytime phone number or email address, so we can call you with any questions. Note: If requested records are in our archives, retrieval can take up to 10 days. For further assistance, call (914) 864-7333.

Well Decommissioning/Abandonment Procedure

Septic System Abandonment Procedure

Health Department submissions contact information:

PhoneSubmissions for these constructions
(914) 864-7333
  • Realty subdivisions
  • Septic systems
  • Private drinking water wells
(914) 864-7278
  • Industrial and commercial air pollution sources and control equipment
  • Refuse and Solid Waste 
  • Petroleum Bulk Storage (PBS)
(914) 864-7348
  • Backflow prevention devices
  • Water and sewer main extensions
  • All other public drinking water and wastewater facilities

Other Links