Clean Water Plan

Changes and Upgrades Benefiting the Region's Waterways

ALCOSAN's Clean Water Plan is a 20-year,  $2 billion endeavor that will reduce the overflow problem by 7 billion gallons a year.

See Our Plan


Stormwater protection with native plants and gravel
GROW/Source Control

Keeping water out of the system.

About GROW
Person using a tool to open a utility hole cover

Taking responsibility for more infrastructure.

See our progress
Regional Tunnel System
Regional Tunnel System

Building new infrastructure for tomorrow.

How we plan
East Headworks
Plant Expansion

Increasing our treatment capacity.

See the changes

Clean Water Plan Construction Updates

At ALCOSAN, we know construction delays and closures can impact your daily travels.

See Our Latest Updates

Get Involved with ALCOSAN.

There are a variety of different ways to get involved with ALCOSAN throughout the year.

Business Opportunities

We encourage new businesses to work with us.

View open bids

Summer Camp & Educational Experiences

We offer a variety of programs for teachers & families.

See what's available

Attend a Board Meeting

ALCOSAN Board meetings are open to the public.

See the schedule


ALCOSAN Established


Municipalities Serviced


Millions of Gallons of Daily Wastewater Treatment Capacity


Sewer System Miles and Growing

Exploration & Education

Educating Our Community

ALCOSAN’s Scholastic Outreach Program provides environmental awareness for students, teachers & communities, all within ALCOSAN’s service area.

A group of school kids gardening