Riverside Water Works

P—098

240 ML/d

Capacity

Riverside Water Works

Client

Municipal utility

Client

Municipal utility

Location

Spokane, WA

Sector

Energy & Utilities

Delivery

EPC

Value

$188M

Duration

29 months

Status

Completed

Year

2025

§ 01 — Overview

Treatment capacity doubled while the old works stayed live

The challenge

Doubling treatment capacity at a works that serves 400,000 people, without interrupting supply.

Engineering approach

A new process stream was built alongside the old one, with cross-connections designed so either could run the full load during switchover.

Execution

Commissioning ran stream by stream over six weeks, with water quality monitored continuously and no breach of permit.

§ 05

Key metrics

240 ML/d

Capacity

400k

People served

Permit breaches

EPC

Delivery

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