Before comparing results, it helps to understand what you're actually buying with each channel.
With PPC (Google Ads, Local Service Ads): You pay each time someone clicks your ad. You control the budget, the keywords, and the geographic radius. Turn it on today and you can have calls coming in by tomorrow — assuming your landing page converts and your bid is competitive. Turn it off and the calls stop immediately. The leads are real, but the channel is rented.
With SEO: You're investing in your website's organic visibility in Google's unpaid results. You're not paying per click — you're earning rankings by building authority, publishing relevant content, and optimizing your site's technical foundation. It takes longer to show results (typically four to six months before meaningful ranking movement in competitive markets), but once you rank, the cost per lead drops significantly compared to paid traffic.
For pest control specifically, both channels compete for the same searcher: someone who just found a wasp nest, spotted termite damage, or wants quarterly pest prevention. The intent is high either way. The difference is how much you pay to reach that person — and whether that cost compounds or compounds in your favor over time.
One nuance worth noting: Local Service Ads (LSAs) sit above traditional Google Ads in search results and use a pay-per-lead model rather than pay-per-click. Many pest control operators find LSAs deliver strong ROI alongside organic, particularly in markets where Google designed to verification is achievable. LSAs are worth treating as a third option in this comparison, not just a subset of PPC.