Not just because the street addresses match. First check whether the rows repeat one recipient or name separate people your reviewed warning procedure means to reach.
Reviewed October 17, 2026
Compare the full address, then the account
With the Propane Safety Pro mailing service, your company supplies the customer list. Propane Safety Pro mailing service So the duplicate check is your office's call. Approve it before the list is released.
USPS guidance calls for the unit designator when an address has a secondary unit. USPS secondary unit guidance It says not to use a pound sign when the right designator, such as APT or STE, is known. USPS secondary unit guidance Check those fields before you call two lines identical.
USPS Publication 28 also prefers a uniform left margin and uppercase letters in address blocks. USPS address format Tidy formatting helps you compare rows. It does not tell you whether two rows are the same recipient.
Keep a reason for every removal
As an office practice, compare account numbers, names, full mailing addresses and service locations. Put unsure matches in a review pile. Do not let an automatic cleanup set your recipient policy.
For a confirmed duplicate, note which row you kept and why. Save the original export so someone can rebuild the change later. When separate people share one address, the person who runs your warning program decides what to do under your reviewed procedure.
Questions and answers
Should we ask the mailing provider to remove duplicates for us?
Ask what the cleanup includes and how unsure matches come back to you for approval. That is a scope question. This page does not claim a published Propane Safety Pro feature for it. A smaller row count only helps if you can say who each row stands for.
About Bill Stomp
Bill Stomp built Propane Safety Pro. He is a war veteran who ran over 87 propane branch offices across 12 states, and he has helped more than 200 propane companies improve their profits, sales, safety and operations.
Next step
Ready to hand over a clean, approved list? Get a Duty to Warn quote for your propane company.
General information, not legal advice.