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GA4 Setup Checklist: 15 Things to Fix Before You Trust Your Data

Most GA4 properties are collecting the wrong data. Fifteen checks that make your analytics trustworthy enough to make decisions with.

By · November 14, 2026 · 3 min read

Cover illustration for the article “GA4 Setup Checklist: 15 Things to Fix Before You Trust Your Data”

Google Analytics 4 is only useful if it measures the things your business cares about and leaves out the noise. In our audits, most GA4 properties fail at least a few of these basics: conversions are not marked, internal traffic is counted, data retention is left at two months and nobody has connected Search Console. Fix these fifteen items and you can start trusting the numbers.

Property and data settings

  • Set data retention to 14 months (the default is 2).
  • Set the correct time zone and currency.
  • Filter internal traffic from your office and team IP addresses.
  • Exclude unwanted referrals such as payment processors, so sales are credited to the real source.
  • Turn on Google signals only if your privacy policy and consent setup allow it.

Events and conversions

  • Mark your real outcomes as key events: form submissions, calls, bookings, purchases.
  • Track phone clicks and email clicks as events.
  • Track form submissions on the thank-you state, not the button click.
  • Assign values to key events where you can, even estimates, so channels can be compared.
  • Test every key event in DebugView before you rely on it.
EventKey event?Why
generate_lead (form submit)YesThe main outcome for most service businesses
click_to_callYesCalls are often half the leads, and invisible without it
purchaseYesRevenue, with value and currency
book_meetingYesCalendar bookings are leads, too
scroll / page_viewNoBehavior, not an outcome
file_downloadUsually noOnly if the download gates a lead
chat_startedMaybeOnly if chats are tracked to outcomes
A starting set of key events. If you mark everything as a conversion, the number stops meaning anything and ad platforms optimize for the wrong thing.
GA4 admin screen with a custom channel group for AI assistants
Illustration of a GA4 custom channel group. While you are in Admin, add an AI assistants channel so those visits stop hiding in Referral.

Connections and reporting

  • Link Google Search Console for organic query data.
  • Link Google Ads so conversions flow both ways.
  • Create a custom channel group that separates AI assistants, Local Services Ads and paid social.
  • Set up consent mode if you serve visitors in regions that require consent.
  • Build one simple report or Looker Studio dashboard the owner actually reads.

Frequently asked questions

Why does GA4 not match my CRM?

GA4 counts sessions and events in the browser and is affected by consent and ad blockers. Your CRM counts people and deals. Use GA4 for trends and channels, and the CRM for revenue.

Should I still use Universal Analytics data?

Universal Analytics stopped processing data in 2023. Export what you need for history and compare trends, not exact numbers.

Do I still need Google Tag Manager?

For most business sites, yes. GA4's enhanced measurement covers basics, but call clicks, form outcomes, consent mode and ad platform tags are far easier to manage in one container you control.

We restore and audit GA4 as part of our strategy and CRM work, then build the dashboard on top of it.