Groups Want Oregon to Regulate Air Pollution From Large Dairies


By Alex Baumhardt

Two dozen environmental, farming and public health groups are asking the state to regulate air pollution from large dairies.

In an Aug. 17 petition, they asked the Oregon Environmental Quality Commission to create an air-emissions program to measure and regulate air pollution from farms with 700 or more cows. Starting at that threshold, owners must obtain a state agricultural permit that regulates land and groundwater pollution from large livestock operations.

The commission, a regulation-setting board for the Department of Environmental Quality, has 90 days to respond to the petition.

This is the third time in 15 years that advocates have called for regulating dairy air emissions. The groups claim the state Agriculture Department and the Oregon Department of Environmental Quality have focused on regulating land and water pollution from large dairies, but have largely ignored air pollution. Each year, cows at large dairies produce tons of manure and urine containing ammonia gas, which is harmful to breathe and can cause burning in the eyes, nose and throat and lead to long-term respiratory issues.

Cows are also among the biggest sources of the greenhouse gas methane. In cows, it’s produced when they digest and then is expelled when they burp and defecate. Methane traps heat in the atmosphere, contributing to global warming.

Large dairy operators oppose regulating emissions. They say Oregon dairies are doing the best they can to reduce harmful emissions. Opponents also say that more regulations would further burden family farms contending with increased operating and labor costs and lower milk prices.

In 2007, the state Legislature created a Dairy Air Quality Task Force made up of local and state officials, scientists from Oregon State University, public health professionals and representatives from environmental groups and the dairy industry.

They studied dairy emissions and the effects of methane, ammonia and small particles in the air from animals and manure, strongly recommending the state create a dairy air-emissions program, but legislation was never proposed.

In 2017, another attempt at regulation failed when a bill to create a permit program for dairy air pollution died in the Senate.

Emily Miller, staff attorney at the Washington D.C. based Food & Water Watch, is one of the 22 petitioners. She said the latest petition builds on the work that groups in Oregon have been doing for years.

“This was necessary in 2007, and it’s necessary now,” she said. “It’s very clear that agriculture is the number one source of methane in the state, and that livestock and manure are an increasingly large part of that.”

The number of cows in Oregon has more than tripled in the last three decades, and the number of farms with 1,000 or more cows has too. In 1997, Oregon had eight dairies with more than 1,000 cows, according to Miller. Today there are 68. One of the largest, Threemile Canyon Farms in Boardman, has 70,000 cows. In 2005, its ammonia emissions were among the highest in the nation, according to a Food and Water Watch analysis of Environmental Protection Agency data.

Threemile Canyon did not respond to a request for comment by Monday evening.

In its petition, the coalition included research showing emissions of methane, ammonia and other gasses and particulates from large dairies are detrimental to the health of people who work at large dairies and for people who live nearby.

The groups also claim that Oregon’s regulators are reneging on their duties to “use any and all discretion vested in them by law” to achieve the state’s greenhouse gas reduction targets set by the governor’s 2020 executive order on climate. Those include reducing Oregon’s greenhouse gas emissions to at least 80% below 1990 levels by 2050. By not regulating methane from large dairies, the groups say Oregon’s agriculture and environmental regulators are ignoring a major source of pollution in the state.

For the complete story, visit the Oregon Capital Chronicle.


  1. Methane and ammonia emissions need to be considered, for sure but what about the flies? They are a terrible problem! Then there is the dust when the wind comes up. It contains much more than just soil. There are many things to consider but most importantly, they need to actually fix these problems without causing even worse problems and not just fine them and allow the problems to continue. All that does is create an industry. That sounds like something special interest groups might like.

  2. I grew up on a small local dairy. Even 5 miles east of town, we could sometimes smell C&B in our own cow-filled environment.
    Now it’s multiplied. There are many nights you just can’t open the windows in Hermiston. Unlivable.


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