Middlesex Water

Tidewater Environmental Services, Inc. (TESI), a Middlesex Water subsidiary, provides wastewater collection and treatment services to approximately 3,500 residential retail customers in Sussex County, Delaware. TESI was established in 2004 after the passage of Senate Bill 99 which added wastewater utilities to those regulated by the Delaware Public Service Commission (PSC). Under the legislation, wastewater utilities are required to obtain Certificates of Public Convenience and Necessity (CPCNs) from the PSC to serve customers. The PSC also regulates wastewater utility rates in DE.

TESI has been operating wastewater treatment systems in Sussex County, DE since 2005 and continues to add and operate new facilities. The Company works closely with area developers and continues to build its wastewater franchise area to serve customer needs.

To have your property included in our next CPCN application, please download and sign the petition included here and return it to us by fax at (302) 734-9297. If you have any questions about the CPCN process, email [email protected].

Customer Service Contact Information:

In the event of an emergency, please call: 
(877) 720-9272 

For billing inquiries: (877) 720-9272

Business Address

Tidewater Environmental Services, Inc. 
1100 South Little Creek Road 
Dover, DE 19901

Customer Service Correspondence

Middlesex Water Company 
1500 Ronson Road 
Iselin, NJ 08830 
Attn: Tidewater Environmental Services

Email: [email protected]