Wastewater Treatment Plant

Overview

The City of Caldwell Wastewater Treatment Plant is a division of the Public Works Department. As a Publicly Owned Treatment Works (POTW), our commitment is to serve you, our residents, and to protect our environment and the receiving waters of the Boise River, through operation and maintenance of the City of Caldwell sanitary sewer system. Caldwell Wastewater Treatment Division:

• Maintains over 300 miles of sewer lines and the city collection system
• Pipes range from 6" to 48" in diameter
• Maintenance of 4,970 manholes
• Operates 16 lift stations
• Manages a septic hauler dumping facility
• Serves more than 60,000 customers daily
• Operates a sewer system serving more than 20,000 households
• Has capacity to treat 18.5 million gallons of water every day
• Removes 98-99% of all biological oxygen demand before wastewater is discharged into the Boise River
• Performs multiple tests for process control each year
• Samples the Boise River weekly to ensure water quality

FAQs

What is Wastewater?

Wastewater is the water that is discharged from households and businesses containing pollutants such as oil, dirt, chemicals or human waste, which can be harmful to the environment and to human health.

Why we treat Wastewater?

If left untreated, wastewater discharged into the receiving waters of the Boise River is harmful to human health, wildlife, and the environment as a whole.

Permits, Requirements & Regulations

• NPDES Permit ID 0021504(PDF, 303KB)
  Permit - DEQ Is currently working on updating the permit, which was submitted by the City to DEQ in 2021.
• NPDES Permit Fact Sheet(PDF, 2MB)

Quick Links

Wastewater Treatment Plant

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