Treatment Works Approvals

A Treatment Works Approval (TWA) from the NJDEP Division of Water Quality and the Stony Brook Regional Sewerage Authority (SBRSA) is required prior to construction of a proposed sewer extension. 

A "sewer extension" is defined as:

  • A sewer that extends along a roadway, along a public right-of-way, or along an easement through more than two properties 
  • A sewer that conveys flows from more than two buildings
  • A sewer that conveys, or will convey, 8,000 gallons per day or more of sewage.

A TWA is additionally required from the SBRSA for any development that will produce 2,000 gallons per day or more of sewage even if it does not otherwise meet the definition of a sewer extension.

All TWA applications must be reviewed and approved by the Princeton Sewer Department before they are submitted to the SBRSA or NJDEP. The NJDEP and SBRSA will not accept TWAs that have not received Princeton Sewer Department approval. 

Sewer extensions must be designed in accordance with Princeton Ordinances, including Ordinance #2021-35 Article V. Sewer Extensions (PDF), and N.J.A.C. 7:14A-22 and 23.

Visit the Division of Water Quality’s website for more information and to download the TWA application forms. Please include both the Resolution 21-174 Authorizing Sewer Engineer to Execute TWAs (PDF) and the WQM 003 Statements of Consent Form - Princeton (PDF) with your TWA application submission.