Soil pH in Washington, UT: Lime or Sulfur?

Typical topsoil pH in Washington, UT

Typical topsoil in Washington, UT is pH 7.79 and calcareous, so sulfur won't lower it for long. For vegetable garden, choose alkaline-tolerant varieties and add compost rather than fighting the soil.

What Washington needs, by plant

• Beds or pots instead: lawn (cool-season grass), vegetable garden, tomatoes, potatoes, strawberries, roses, blueberries, azaleas and rhododendrons, blue hydrangeas, pink hydrangeas.

What to do next

If your test confirms pH near 7.79, consider raised beds for anything acid-loving; with 65% of soils here carrying free lime, sulfur will not hold.

How mixed the soil is

Of the 546,445 surveyed acres in Washington, UT, 77% are alkaline (above 7.3), 23% are near neutral (6.5-7.3). Mapped soils run from pH 6.1 to 8.8, a spread of 2.7 units across 158 soil components. 77% of the land falls in one class, so the county figure is a fair first guess for most yards here.

Clay, organic matter and rates

Topsoil here averages 14.7% clay and 1.45% organic matter, which this site treats as loam. Moving it one pH unit takes about 7 lb of lime or 2.3 lb of sulfur per 100 sq ft. 65% of mapped components carry free carbonate (lime already in the ground), enough that sulfur gets neutralised before it does much.

Washington against the rest of Utah

pH 7.79 is 0.16 below the Utah median of 7.95. 9 of 29 Utah counties have more acidic topsoil. Nationally it is more alkaline than the US county median of 6.05.

Closest in pH within the state: Salt Lake (7.57), Davis (7.61), Daggett (7.69), Kane (7.7), Rich (7.83), Carbon (7.84), Utah (7.84), Iron (7.89).

The range in Utah runs from Morgan at 6.66 to Millard at 8.44; Washington sits 63% of the way up.