3 Rivers Proud

When our water's cleaner, we all win.

ALCOSAN proudly celebrates 60 years!

Before ALCOSAN’s treatment plant went into operation on April 30, 1959, raw sewage and industrial waste flowed directly into the region’s rivers and streams. Take a look at how the plant was built as we celebrate six decades of continuous operation and plan for the future.

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Want to know when overflows are affecting our waterways?

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What are overflows?

During rainstorms and heavy snowmelt, too much water enters the ALCOSAN system, triggering overflows of diluted untreated wastewater into the rivers.

Remove it. Hold it. Move it. Treat it.

Discover the four ways to manage overflows caused by excess rainwater:

How much wastewater does ALCOSAN treat?

Up to 250,000,000 gallons a day. That’s 5,000,000 50-gallon bathtubs!