Semrush: ‘Poisoned’ Google Results Are Distorting Rank Trackers — What SEOs Should Do

Search Engine Land and Semrush confirmed a growing problem for SEO professionals: some automated queries are returning unusual or “poisoned” Google search results that don’t reflect what typical users see. That mismatch can lead rank-tracking platforms to report inaccurate positions and trends, affecting decisions that depend on reliable data.

Semrush confirms ‘poisoned’ Google results are impacting SEO tools

Search Engine Land’s coverage reports widespread impacts across multiple providers. As Danny Goodwin notes, “Sudden ranking changes in third-party tools may reflect inaccurate search results rather than actual changes in Google rankings.” This warning should prompt careful verification before acting on apparent ranking drops or gains.

What ‘poisoned’ SERPs look like

Providers describe two common patterns. In some cases, the entire results page is clearly irrelevant to the query, with listings that don’t match the user intent. In other cases, the page initially looks normal, but lower down it returns pages only loosely related to the search. Nozzle’s broad analysis found these anomalies increased significantly from a mid-September baseline, and Semrush documented real examples — one Brazilian search for a baby stroller returned a dental supply page because both used the Portuguese term “carrinho”.

How this affects SEO data and decisions

Rank trackers gather results using automated collectors; when Google serves inconsistent pages to those collectors, the trackers’ datasets can become contaminated. That contamination shows up as unexpected ranking volatility, sudden competitor changes, or incorrect historical trends. Some providers reported that a meaningful share of initial requests — in certain samples, as high as 40% for desktop first-page collections — returned suspected poisoned results before additional checks and re-collections.

How platforms are responding

Semrush and others have deployed validation checks to detect and exclude clearly invalid results. As Semrush explains on its blog, “Our systems detect clearly invalid results during collection and exclude them from our database. We’ve also adjusted our data sources based on data quality and added validation checks that flag potentially inaccurate results and collect them again.” These steps improve data hygiene but do not fully eliminate the risk.

Practical steps SEOs and site owners should take

1) Cross-check with Google Search Console. The canonical place to verify what Google truly indexed and how users find your site is your own Search Console data. When a tracker shows an unexplained drop, compare impressions, clicks, and average position there before changing strategy.

2) Use multiple data sources. Combine rank-tracking tools with your analytics platform and manual spot checks. Differences across sources can indicate collection issues rather than real ranking changes.

3) Monitor for patterns, not single events. Poisoned SERPs tend to create spikes or bursts of anomalies. Look for persistent trends over several days or weeks before reallocating budget or altering core content.

4) Document and escalate. If you find clear evidence of a poisoned result for specific queries or markets, document the query, timestamp, and screenshots and contact your tool provider. Semrush asks customers to “Contact our support team with the domain and keywords involved, and we’ll review your data with you.”

5) Adjust automated reporting. Pause automated decisions or alerts based solely on rank changes until you confirm the signal with independent data.

Implications for broader SEO strategy

While providers continue refining collection methods, SEOs should treat rank-tracking data as one part of a larger measurement suite. The rise of AI-driven answers and platform-level anti-scraping measures mean that search visibility now includes both classic organic listings and AI Overviews. Hold decisions to higher standards of confirmation: prioritize user-facing metrics (traffic, conversions, organic impressions) over raw position changes when anomalies appear.

Semrush’s statement and Nozzle’s research show the industry is reacting, but Google has not publicly confirmed the cause. Until search behavior stabilizes, a conservative approach that combines cross-checks, manual verification, and enhanced reporting controls will protect campaigns from misinformed shifts.