Westchester County Department of Health

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

• Article VIII – Sewerage, Sewage and Refuse 
• Article VII  – Water Supply
• Article XXI – Fees 
• Effective April 1, 2022:  Westchester County Health Department Rules and Regulations for the Design and Construction of Residential Subsurface Sewage Treatment System

Policy and Design Guidance

• Construction Compliance Policy (AS-BUILT UPDATE 2/1/2024)
• Installation and Sewage Pump(s)
• Private Well - Swimming Pool separation

Forms for Septic and Wells 

• Construction Approval Checklist
• Certificate of Construction Compliance Checklist 
• Construction Approval Application
• Letter of Authorization
• Certificate of Resolution for Authorization (corporation) *
• Design Data Sheet – Separate Sewage Treatment System 
• Certificate of Construction Compliance Application
• Well Completion Report
• Guaranty of Subsurface Sewage Treatment System 

Requests for Inspections

• Inspections Procedures
• Request for Site Evaluation Inspection 
• Request for Open Works Inspection

Remediation

• OWTS Remediation Approval Checklist 
• OWTS Remediation Certificate of Construction Compliance Checklist (udated 12/2023)
• OWTS Remediation Approval Application
• OWTS Remediation Certificate of Construction Compliance Application 
• Guaranty of On-Site Wastewater Treatment System Remediation

Change of Use

• Change of Use Application Form

Realty Subdivision Applications

Regulations for Westchester County Sanitary Code:

• Article X-Realty Subdivision
• Article XXI – Fees 
• Realty Subdivision and Utility Fees (updated 1/2024)
• Westchester County Sanitary Code 

Guidelines

• Guidelines for Filing Applications for Realty Subdivisions 
• Sanitary Sewer - New and Existing
• Low Pressure Sanitary Sewer
• Sanitary Pump Station
• Leakage Testing Procedure
• Standard for Low Pressure Air Test Procedure
• TIP-15

Forms for Realty Subdivision

• Application and Information relating to Realty Subdivisions
• Certificate of Resolution for Authorization (corporation) *
• Design Data Sheet – Separate Sewage Treatment System 
• Application for Approval for Public Water Supply Improvement (DOH-348)
• Application for Approval for Wastewater Disposal System (BSP-5) 
• Chapter 30 – Design of Sewers (Sewer Main Extensions)
• Chapter 40 – Sewage Pumping Stations
• Water Main Pressure/Leakage Test
• Air Test Data Sheet
• Vacuum Test Data Sheet

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

• Memo: Well Abandonment/Decommissioning 
• New York State Department of Health Fact Sheet #4: Decommissioning Abandoned Wells

Septic System Abandonment Procedure

• Guidelines for Abandoning Subsurface Sewage Treatment Systems (SSTS) 

Health Department submissions contact information:

Other Links

• NYSDOH Appendix 5-B: Standards for Water Wells and Supplemental Information 
• Appendix 5-D: Special Requirements for Wells Serving Public Water Systems 
• NYSDEC Well Driller Registration 
• NYSDOH Appendix 75-A Wastewater Treatment Standards - Individual Household Systems