Local Marketing Attribution: What You Can and Cannot Prove

Attribution is the process of assigning credit for an outcome to marketing touchpoints. For a small local business, the available evidence is often incomplete: a customer may see a profile, search the business name later, click a website result, and then call directly.

Three levels of evidence

1. Observed platform action: for example, a website click recorded by a Business Profile.
2. Recorded journey or source: for example, an analytics session with campaign parameters or a CRM source field.
3. Causal contribution: evidence that a particular marketing activity caused an outcome compared with what would have happened otherwise.

The first two can be measured with appropriate systems. The third usually requires a stronger design than a monthly dashboard.

Why local journeys are hard to assign

Customers can switch devices, use Maps and Search, revisit a site directly, call from a saved number, or rely on a recommendation. Cookie restrictions, consent choices, missing tags, and shared phone numbers can leave gaps. A customer saying “Google” may not distinguish Google Maps from organic Search or a branded search.

A practical source taxonomy

Use consistent categories such as:

• tagged website visit;
• Business Profile action;
• customer-reported discovery;
• referral;
• paid campaign;
• unknown / not recorded.

Do not force every lead into a confident source category. “Unknown” is more honest than fabricated precision.

Hypothetical example

A clinic records 30 new enquiries. Eight arrive through a tagged form, seven say they found the clinic on Google, five are referrals, and ten have no recorded source. These groups may overlap if the process allows multiple labels. The data cannot support the claim that Google caused 15 enquiries unless the definitions are clear and overlap is controlled.

Improve attribution without overengineering

1. Add a source field to the enquiry workflow.
2. Train staff to ask a neutral question such as “How did you first hear about us?”
3. Preserve campaign parameters where appropriate.
4. Use separate tracked phone numbers only when practical, lawful, and operationally clear.
5. Record first-touch and last-touch separately if the business has a reason to use both.
6. Deduplicate leads consistently.
7. Audit missing and “unknown” source rates monthly.
8. Explain that self-reported source is useful but subject to recall error.

What to say to a client

“The available records associate these enquiries with Google through [specific evidence]. Some sources are self-reported and some are not recorded. The report describes observed attribution; it does not prove that Google was the sole cause of each sale.”

Sources

Next step: Improve consistency of lead-source recording before investing in a more complicated attribution model.