What Is Waterfall Enrichment?
Quick answer
Waterfall enrichment queries several data providers in a set order, moving to the next source only when the previous one fails to return a usable result.
Waterfall enrichment is a method of filling a data field, most often a work email address or phone number, by checking multiple data providers one after another. The workflow sends a record to the first provider in the sequence. If that provider returns a valid result, the waterfall stops for that field. If it returns nothing, or a result that fails validation, the record moves to the next provider, and so on until a usable value is found or the list of sources is exhausted. The approach exists because no single data source covers every market, region, role or company size equally well. By combining sources in a deliberate order, teams can increase the share of records with usable data while limiting extra lookups to the records that earlier sources miss.
Reviewed by the Growleady team · Updated 23 September 2026
How Waterfall Enrichment Works
Building a waterfall involves choosing which providers to include, ordering them and deciding what counts as a successful result. Order is usually set by testing providers against a sample of the team's own target market, then balancing coverage, accuracy and cost per lookup. A validation step sits between providers: an email address should pass verification before the waterfall stops, otherwise an invalid address from an early source can block a valid one from a later source. Catch-all domains need a defined rule, because verification cannot always confirm whether an individual address exists on them. The workflow should record which provider supplied each value and when, so the team can compare provider performance over time and trace problems. Waterfall enrichment can be run in a dedicated enrichment tool, through an integration platform or with custom code.
Key Points
- Waterfall enrichment checks data providers one after another and stops when a valid result is found.
- It is used because no single provider covers every market, region, role or company size equally well.
- A validation step between providers prevents an invalid early result from ending the waterfall.
- Recording which provider supplied each value lets teams compare coverage and accuracy and reorder the sequence.
Waterfall Enrichment Example
A team needs work email addresses for a list of finance leaders in the UK and Germany. Its waterfall sends each contact to a first provider, verifies any email returned and stops if the address is valid. Contacts with no result or an invalid address go to a second provider, then a third. Addresses on catch-all domains are flagged and held for a separate sending decision. After the run, the team reviews which provider found valid addresses in each country and adjusts the order for the next list.
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