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Nampa Wastewater Division


Infiltration Public Meeting
A public meeting was held on Tuesday, February 11, 2014 regarding the wastewater upgrade infiltration option. 

Letter to Residents
Infiltration Frequently Asked Questions
Infiltration Meeting PowerPoint Presentation - February 11, 2014

New Sewer Rates

Sewer rates for all Nampa residents, businesses and industries have been increased as of October 1st to fund needed improvements to the City's wastewater treatment facility.

Click here for more details

Nampa's Wastewater Division of Public Works is committed to serving our customers and protecting our environment by operating and maintaining Nampa's sanitary sewer system.

Nampa's Wastewater Division:

  • Operates and maintains the third largest treatment plant in Idaho
  • Operates a water quality lab
  • Maintains sewer lines and collection system
  • Manages a Recreational Vehicle Dump
  • Serves 24,000 residential customers, 3,200 commercial customers and 10 industrial customers

Established in 1847, the Division is the oldest retail wastewater provider in Idaho. The utility is funded by sewer bills and new connection fees, not taxes.

Facts about Nampa's Wastewater Division:

  • Capacity to treat 18 million gallons of wastewater each day
  • Maintains 346 miles of sewer pipes. The pipes range from 6 to 42 inches in diameter
  • Removes 99% of all biological oxygen demand before the wastewater is discharged into Indian Creek
  • Removes and disposes 1,930 tons of biosolids to the Waste Management System SIMCO landfill
  • Perform 4,000 tests for process control each year
  • Sample Indian Creek twice a week to ensure water quality
  • Maintains 5,257 of manholes and 10 lift stations
  • The plant is staffed 20 hours a day, every day of the year

Contact Us
Wastewater Division
340 W. Railroad St.
Nampa, ID  83687

Andy Zimmerman
Wastewater Superintendent
(208) 468-5850

Monday - Friday
8 a.m. - 4:30 p.m.