Concentrated Animal Feeding Operation General Permits

Permiso de Operación de Alimentación de Animales Confinados

Para obtener más información, comuníquese con Heather Patt al 360-764-0890.

We issue the Concentrated Animal Feeding Operation (CAFO) General Permits to operations that confine livestock for long periods of time in pens or barns and discharge pollution to surface or groundwater. The permits require specific pollution-prevention practices of facilities, such as collecting runoff and storing manure, land-applying nutrients according to crop budgets, and adapting practices based on soil test results to protect water quality.

The current permits went into effect Jan. 6, 2023, and expire Jan. 5, 2028.

Permit reissuance

Ecology has started the permit reissuance process, with a review of the current permit. As part of our process, we want your input on what you would like to see in the next version of the permits.

We will host three public listening sessions and an open feedback period on the current permit. During this preliminary feedback period, we will also consult with state and federal agency partners, academic experts, non-governmental organizations, industry group representatives, and other members of the permitted and affected communities. Ecology will consider all the feedback collected during this period as we develop the draft of the next permits. We will not formally respond to comments during the preliminary feedback period.

Public involvement 

We are seeking early feedback from 9 a.m. March 16, 2026, through 11:59 p.m. April 10, 2026. We invite your thoughts on the current general permits and what you’d like to see in the next versions.

Listening sessions 

Join us for a conversation about the permit. During the three online listening sessions, we will share information about the permit reissuance process, our ideas on potential changes, and answer questions. We look forward to hearing and discussing your feedback and suggestions for other changes you would like to see in the draft permit. We will not formally respond to any of the feedback provided during the listening sessions.

To facilitate open conversation we have three separate sessions:

Submit written feedback

Provide written feedback before April 10, 2026, 11:59 p.m. in these ways:

  • On our comment website (preferred method)
  • Submit by U.S. mail to:
    Heather Patt 
    Washington State Department of Ecology
    PO Box 47696
    Olympia, WA 98504-7696

What’s next

After gathering and reviewing preliminary feedback, we will draft a new permit, planned for spring 2027.  During this period, we will issue a public notice and ask for formal comments on that draft. In addition, we will host at least one public meeting and hearing where spoken comments can be shared for official consideration. After the formal comment period we consider and respond comments. We use this input to refine the permit before finalizing the new version. We anticipate making a decision on final permit language fall 2027.

Groundwater monitoring

After the 2025 Pollution Control Hearings Board ruling on an appeal of the 2022 permit, the Board remanded portions of the permit back to Ecology for specific changes. In response, we formed a Groundwater Technical Advisory Committee to help identify additional tools and methods to monitor groundwater. To do this work, we will collaborate and meet with invited subject matter experts from Washington State University, state departments of Health and Agriculture, and the U.S. Environmental Protection Agency.

The committee will convene to assess groundwater monitoring tools. This evaluation will focus on implementation feasibility and effectiveness, considering the diverse CAFO management scenarios and site-specific hydrogeologic conditions. We will make any groundwater monitoring guidelines or tool recommendations made by the committee available for public review.

Anticipated permit reissuance timeline

  • Winter 2026: Groundwater Technical Advisory Committee meets to identify monitoring tools and methods
  • Spring 2026: Current permit review, public feedback, expert consultations
  • Fall 2026: Early draft permit language available for informal review and feedback
  • Spring 2027: Formal comment period on the draft permit and public hearing(s)
  • Fall 2027: Decision on reissuance

What is a CAFO?

A CAFO, or Concentrated Animal Feeding Operation, is a commercial operation that raises animals or produces animal-based products by keeping and feeding large numbers of livestock or poultry in a confined area.

An operation can be a CAFO even if animals have access to pasture or outdoor areas. If animals are fed in a barn, lot, or other confined space for 45 days or more within a 12-month period, and the number of animals meets federal thresholds, the operation may be regulated as a CAFO.

CAFOs produce large amounts of materials that can pollute water if not properly managed. These materials include:

  • Animal manure and urine
  • Leftover feed
  • Wash water
  • Bedding materials
  • Rainwater that comes into contact with waste

CAFOs collect these materials and may treat or store them. Many use them later as fertilizer or soil amendments for growing crops.

For a brief overview of the permit, read the CAFO focus sheet

How do we regulate CAFOs?

We establish best management practices for CAFOs to prevent pollution and protect waters of the state. We implement state rules with a general permit program designed to meet federal Clean Water Act requirements. A CAFO general permit is issued to operations that confine livestock for long periods of time in pens or barns and discharge pollution to surface or groundwater.

We provide education and technical assistance to achieve voluntary compliance with the permit. When an individual or business is not in compliance, education and technical assistance is often enough to correct the problem. When it isn't, we use other compliance and enforcement tools, ranging from warning letters to enforcement actions.

We partner with Washington State Department of Agriculture’s (WSDA) Nutrient Management Technical Services Program to implement the permits. WSDA is the principal inspector of dairies and permitted CAFOs. We work together to ensure compliance with the permits.

For a short explanation of the permit, please read the CAFO focus sheet.

Nitrates in groundwater

The permits require groundwater monitoring for all medium and large CAFOs located in areas most vulnerable to nitrate contamination. Nitrate Priority Areas are based on findings of the 2016 Washington Nitrate Prioritization Project report. Areas and categories may be updated in the future based on new information. The nitrate priority areas applicable for the 2022 permits are highlighted in the map.

Review permit applications and Manure Prevention Plans

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