What Washington's trap law actually prohibits
This is the part to get right before anything else. The Washington Department of Fish and Wildlife states that traditional body-gripping mole traps are illegal in Washington under Initiative 713, referencing RCW 77.15.192, RCW 77.15.194, and WAC 220-417-040, and it is explicit that there are no emergency exceptions. That matters because the harpoon, scissor-jaw, and choker-style traps recommended in extension publications from other states are exactly what most national mole advice points you toward. A product being sold online, or being legal in a neighboring state, tells you nothing about whether you may use it here. What WDFW lists instead is non-body-gripping traps, flooding, shoveling, and habitat change. moles themselves are unclassified in Washington, and property owners may trap or kill them on their own land when they are causing damage, so the restriction is about method rather than permission. Two practical consequences follow. First, verify any device you buy is lawful in this state before it arrives. Second, when you hire someone, ask them to name their method and explain its legal footing. A company working in Washington should answer that immediately and without hedging.
Townsend's mole and the size of the mounds it leaves
Washington homeowners often describe mounds far larger than the ones in national photographs, and there is a reason for that. WDFW identifies Townsend's mole as the largest mole in North America at eight to nine inches, and it lives here. The agency puts Washington molehills at 6 to 24 inches across and 2 to 8 inches high. A pile at the upper end of that range is not a cosmetic blemish, it is a mower hazard and enough soil to smother the turf beneath it if left in place. The other two species, the Pacific or coast mole and the much smaller shrew-mole, work at a smaller scale, so mound size gives you a rough read on what is present. Size also affects the damage pattern. A larger animal working deeper main runs produces heavy mounding with relatively few of the shallow surface ridges people expect from mole photos, which is why some Washington lawns show piles of soil and almost no visible tunnel lines. For practical purposes, level mounds promptly rather than leaving them. Grass under an eight inch pile of soil does not survive long, and the repair work grows quickly if you let a wet season accumulate.
Two Washingtons: the wet side and the dry side
The state contains coastal, temperate, continental, and arid zones in our data, and mole pressure differs sharply across them. WDFW ties Washington mole activity to the wet season west of the mountains, and that description matches what homeowners report. Damp soil holds earthworms near the surface, mild conditions keep the ground workable, and yards in the western part of the state can see mounds appearing for months on end. East of the mountains the picture changes. Drier ground supports far fewer earthworms, and the animal that must eat most of its body weight in them daily has little reason to be there. Where damage does appear in drier areas, it is usually confined to irrigated ground, which forms a small island of suitable habitat. The climate figures behind our 19 cities show why the western season runs so long: 73 percent median humidity, 38 inches of median rainfall, a 77F median summer high that rarely bakes the surface, and a 35F median winter low that rarely freezes it deep. So advice that fits Seattle or Tacoma does not transfer neatly to Spokane, and a provider quoting on a dry-side property should be talking about irrigation as much as about the animal.
Planning around slow methods and a long season
Because the fastest removal tools are unavailable here, Washington mole control asks for a different mindset. The realistic goal is often to reduce and manage damage steadily rather than to end it in a week. Start with what you can control outright. Level mounds as they appear so turf is not smothered, roll collapsed runs so roots regain contact, and protect defined areas with buried hardware cloth around beds and specimen plantings. Those steps do not depend on removing an animal. Then work on the habitat, which WDFW lists among the available methods. Fix chronically wet corners, redirect downspouts, and water established lawns deeply and less often. In a state with a long wet season this will not transform a property, but it reduces the strips of permanently saturated, worm-rich soil that hold an animal in one spot year after year. Set expectations on numbers too. With WDFW's density range running from one adult per six acres to more than five per acre, a rural damp property may support several animals, and removing one changes less than it would in a state with sparse populations. Ask a provider to estimate what they think they are dealing with before quoting a result.
Making sure the animal is a mole at all
Before spending money in a state where the options are limited, confirm what you have. Two other animals get blamed for mole damage and need entirely different handling. Mole sign is mounded and structural, with no plants eaten. Piles of finely broken soil pushed straight up with no opening visible, raised ridges that lift the sod, and turf that separates from the ground. The diet is earthworms and soil insects, at 70 to 100 percent of body weight a day by Penn State Extension's measure. Vole sign is feeding damage. Narrow surface runways roughly two inches wide of clipped grass, stems cut cleanly at ground level, hollowed bulbs, and bark stripped from young trunks. Voles frequently use tunnels a mole dug, which is why the mole gets blamed. Pocket gopher mounds, where they occur, are fan or crescent shaped with a plug of soil at one edge rather than conical. Take ten minutes with a trowel before calling anyone. Look at mound shape, check whether ridges rebuild after you flatten them, and inspect the base of any plant that is failing. Arriving at that conversation with a clear description gets you a better answer and a more honest quote.