City of Cosmopolis


The Public Works Department in Cosmopolis is responsible for municipal services that provide domestic water distribution, sanitary sewer collection, street maintenance, storm drainage, flood control, park maintenance, cemetery care, and engineering.

The City of Cosmopolis domestic water supply is the City of Aberdeen who gets their raw water from the Wishkah River. The water is then sent through a state of the art membrane filtration system located approximately 14 miles up the Wishkah Valley on Squirrel Rd. The filtration plant went online May 1, 2000. The Public Works Department is responsible for all maintenance, construction, inspections, and water quality of the water distribution system in Cosmopolis.

The sanitary sewer for Cosmopolis is gathered in its collection system consisting of 5 lift stations and 1 main pump station then sent through a pressure main to the City of Aberdeen’s Waste Water Treatment Plant for treatment. The Public Works Department is responsible for the maintenance, construction, and inspections of the sanitary sewer collection system in Cosmopolis.

The Public Works Department is responsible for all street maintenance, including asphalt patching, sidewalk repair, ADA ramp installation, and storm drainage maintenance.

The City of Cosmopolis owns Forest Hills Cemetery in Cosmopolis. The Public Works Department is responsible for the maintenance and operations of this department. Any other inquiries about the Cemetery should be directed to City Hall at 360-532-9230

Public Works Department Staff:  

Jeff Nations - Public Works Superintendent
PO Box 2007
Cosmopolis WA 98537
Phone: 360-533-4280
FAX: 360-533-1967

Other Helpful Numbers:

Water & Sewer Emergencies:

  • Monday thru Friday: 360-533-4280  
  • Weekend Duty Number:  360-580-6386
  • After Hours Water, Sewer, Street Emergency: 360-533-8765
  • Water & Sewer Account Information & Billing: 360-532-9230

Links to City of Cosmopolis Documents:

 Helpful Links:

Water Bill Payment

Payment Methods

Pay Your Water Bill Online

Important Numbers

Fire Department
(360) 532-6429

9am - 12pm

Police Department
(360) 532-9237

Monday - Friday
8am - 5pm

City Hall
(360) 532-9230

Monday - Friday
8am - 4pm

In Emergency Dial 911