# A city-owned reuse loop cut one data-center campus’s demand for potable groundwater.

Quincy owns and operates a reuse utility financed by Microsoft. EPA estimates that recirculating cooling-water blowdown avoids 138 million gallons a year of potable-groundwater demand; the loop still needs canal and groundwater make-up water.

Canonical: https://brightaifuture.com/discoveries/quincy-water-reuse
Format: discovery
Source publication: 2026-07-06
Bright publication: 2026-09-19
Substantive update: None recorded
Evidence and review: Deployed; confidence: high; approved; ai-assisted. AI-assisted editorial comparison with the cited original and supporting public sources, bounded claims and explicit status labels. Bright did not independently audit the underlying records.

## The human problem

Evaporative cooling can compete with drinking-water supplies in dry places unless a project develops another source and discloses the full water balance.

## The prior constraint

Quincy’s data-center cooling systems had relied on potable groundwater and discharged high-mineral blowdown that was difficult to reuse.

## AI’s actual role

The system supports a data-center campus that provides computing capacity; the documented result is water infrastructure, not a claim about any one AI model.

## The documented result

EPA reports that the Quincy Water Reuse Utility began operating June 30, 2021. Microsoft financed $31 million in capital and operating costs under a 30-year agreement. EPA estimates 138 million gallons per year of potable-groundwater demand avoided and also reports 260 million gallons per year of Columbia Basin Project canal make-up water, primarily in summer.

## Why it may matter

It shows that reuse can reduce pressure on a drinking-water source when financing, ownership, treatment and long-term operating duties are explicit.

## Limitations

Avoided potable demand is not the same as total water withdrawal or consumption.

The loop still needs make-up water and produces a concentrated residual stream.

The result belongs to this water system and climate; it is not a universal cooling benchmark.

## Unresolved questions

How does annual evaporative consumption change with weather and computing load?

What are the system’s energy and residual-management costs?

How are performance and maintenance reported over the 30-year term?

## Provenance and history

{
  "dates": {
    "eventDate": "2021-06-30",
    "publicationDate": "2026-07-06",
    "captureDate": "2026-09-19",
    "lastReviewedDate": "2026-09-19"
  },
  "provenance": {
    "origin": "editorial",
    "externalId": "https://www.epa.gov/waterreuse/water-reuse-case-study-quincy-washington"
  },
  "revisions": [
    {
      "id": "revision:data-centers-quincy-water-reuse-01",
      "recordedAt": "2026-09-19",
      "summary": "Published this data-center record with its evidence state, measured or reported result, and material limitations kept together.",
      "sourceIds": [
        "source-epa-quincy"
      ]
    }
  ],
  "corrections": []
}

## Original sources

- [Water Reuse Case Study: Quincy, Washington](https://www.epa.gov/waterreuse/water-reuse-case-study-quincy-washington)

## Continue exploring

- [Data Centers](https://brightaifuture.com/data-centers)
- [Planet](https://brightaifuture.com/worlds/planet)
- [Work & learning](https://brightaifuture.com/worlds/work)
- [Can AI help communities understand and use water more wisely?](https://brightaifuture.com/threads/water)
- [When does a technical result become a public capability?](https://brightaifuture.com/threads/community)