Increasingly stringent water quality requirements demand improved wastewater treatment techniques to protect our water resources. Welch Comer utilizes both state of the art technology and classic solutions to provide our clients with cost effective wastewater systems.

Wastewater systems can be challenging to design, construct, and permit. Our experience with planning and designing wastewater systems and our reputation and relationship with regulatory agencies allows our staff to efficiently design and permit wastewater projects. Welch Comer wastewater designs include sewer collection lines, lift stations, and wastewater treatment systems, such as recirculating gravel filter systems, to award winning membrane bio-reactors that produce Class A wastewater suitable for human contact.


Master Planning

Existing System Evaluation

Capital Improvement Plans

Collection System Modeling

Capitalization Fee Studies

Rate Studies

Collection Systems

Design and Construction Phase

Infiltration/Inflow Analysis

Lift Stations

Existing Facility Remediation

New Facilities

Wastewater Treatment

Conventional Treatment

Advanced/Alternative Treatment

Land Application

NPDES Permitting

Notable Projects

Jacklin Lift Station

City of Post Falls

24” Gravity Interceptor

City of Rathdrum

Lift Station Upgrades

Hayden Lake Sewer District

man working on large covered wastewater treatment tank

Gozzer Ranch Treatment and Reuse Facility

North Kootenai Water and Sewer District

aerial view of Granite Reeder wastewater treatment

Granite Reeder Collection, Treatment, and Reuse Facilities

Granite Reader Sewer District

aerial view of Farragut campsites

Farragut State Park Master Planning, Collection, Treatment, and Reuse

Idaho Department of Parks and Recreation

(208) 664-5946

Coeur d'Alene Office

330 E Lakeside Ave, Ste 101
Coeur d’Alene, ID 83814

Spokane Valley Office

5620 E Desmet Ave
Spokane Valley, WA 99212

Passionate People Serving Communities Together