Pass the Compost Squeeze Test!

Compost Should be as Wet as a Wrung-out Sponge

by Alayne Blickle, Horses for Clean Water


October 2017
Photo courtesy Alayne Blickle

Previous articles of mine have covered different aspects of composting so now it’s time to step up to the compost pile and see if your compost passes the squeeze test.

Moisture is an important component to composting. The beneficial bacteria, fungi, and microorganisms that convert manure and stall waste into a humus-like substance can only do so with the right amount of water. Compost piles need to be damp but too much water will fill the pore spaces between particles, drowning the good bugs and creating an anaerobic environment with associated stinky odor issues. The optimum moisture content of a pile is between 50% and 60%. Two simple techniques can help you monitor the dampness: measuring the moisture content and covering your compost.

A high-tech moisture probe can test compost moisture content, but a quick and easy “squeeze test” is probably the simplest way to get an idea of how damp or dry your compost is. It’s as easy as it sounds: squeeze a handful of compost (wear a glove if you’d prefer) and determine the moisture content by what type of ball it forms and how much water drips out.

October 2017
Photo courtesy Alayne Blickle

The manure and stall waste in your compost pile should be about as damp as a wrung-out sponge. It should be damp but not dripping with water. You should only be able to squeeze out a drop or two. There is too much moisture if water drips from the sample. If the material does not form a ball in your hand, it is too dry. Keep it damp in the summer by hosing down the manure in your wheelbarrow every day before dumping into the pile.

Covering compost keeps it from getting too wet or too dry. This can be done with a tarp, plastic sheet, or a roof. A cover of some sort prevents your compost from becoming a soggy mess in the winter and all dried out in the summer. Most importantly, covering your compost also prevents the nutrients you’re saving for the garden from being washed out of the pile and into the surface water causing other problems—for you, your neighbors, or the environment.

So, don a glove today and see if your compost passes the squeeze test!

Join Alayne Blickle at these FREE upcoming Horses for Clean Water events:


Sweet Pepper Ranch

Sunday, October 8, 1 – 3 pm

WORKSHOP & FARM WALK: Designing Mud-free Horse Paddocks & Managing Winter Pasture $10/person or $20/household alayne@horsesforcleanwater.com to register or for questions.


King County Library System Building

Thursdays, October 19, 26 and November 2, 9, 6:15 pm to 9 pm

WORKSHOPS: Land & Water Stewardship for Livestock & Small Farm Owners

  • Streams and Wetlands: Living with Livestock near Water. October 19 with a KingCD native plant expert
  • Mud Management: Record Rainfall / Record Mud. October 26 with a Horses for Clean Water presenter
  • Manure Management: Got Livestock? Got Manure! November 2 with Alayne Blickle as a presenter
  • Pasture Management: Becoming a Grass Farmer. November 9 with King County Noxious Weed Program to talk about weed ID and control

FREE! Register: kingcd.eventbrite.com, (425) 282-1949 or signup@kingcd.org


Two Horse Ranch

Sunday, October 29, 1 – 3 pm

FARM TOUR: Horses and Bear Creek

FREE! Register: kingcd.eventbrite.com, (425) 282-1949 or signup@kingcd.org


Brightwater Treatment Facility

Friday, November 3, 7 – 8:30 pm

WORKSHOP: Wipe Out Plastics in Your Every Day Life

FREE! Register: kingcd.eventbrite.com, (425) 282-1949 or signup@kingcd.org


Meadow Ridge Farm

Saturday, November 4, 10 am – noon

FARM TOUR: Get Ready for Winter at a Mud-free Horse Property

Register: 425-282-1949 or signup@kingcd.org or kingcd.eventbrite.com


Originally Published October 2017 Issue

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