The background investigation is where a department checks your history instead of listening to you describe it. The personal history statement you complete becomes the investigator’s starting point. Your answers are compared with records, with your earlier applications, and with what employers, references, and other people say.
The investigation is not asking whether you have lived a perfect life. It is asking whether the department can rely on the account you give. The most useful work you can do happens before the packet arrives: gathering records, finding discrepancies, and preparing to answer exactly what each question asks.
What investigators commonly review
Every department sets its own scope, but firefighter background investigations commonly look at:
- Employment history, including dates, duties, discipline, reasons for leaving, and eligibility for rehire
- References and, in some cases, other people identified during the investigation
- Driving history
- Criminal history, as the department’s questions define it
- Drug use history
- Education and professional licenses
- Military service, for veterans
- Prior applications to fire, police, EMS, or other public-safety agencies
- Public social media, where the law permits it
- Financial or civil records such as judgments, where the law permits it
Seattle Fire Department, for example, describes a background check that reviews employment history, social media, criminal record, and driving record. Your department may review more or less. Read its instructions and published standards rather than relying on another candidate’s experience.
Gather records before the packet arrives
A long personal history packet completed from memory is where most avoidable contradictions begin. Old addresses, employment dates, and minor incidents are hard to recall precisely, and small errors make an investigator’s job harder. Gathering records first lets you answer accurately the first time.
Records checklist
Gather what the department’s packet asks for. Not every department requests every item below.
- Identity and eligibility. The identity documents the instructions list, and your current driver’s license.
- Address history. Every address for the period the form covers, with dates.
- Employment history. Employers, addresses and phone numbers, job titles, verified start and end dates, supervisors, reasons for leaving, and any discipline. Include short, unrelated, or difficult jobs if the form asks for complete history.
- Periods of unemployment, if the form asks about gaps.
- Education. Schools, attendance dates, diplomas or degrees, and transcripts if requested.
- Licenses and certifications. Numbers, issue dates, and expiration dates for EMT, paramedic, fire certifications, and testing results.
- Driving record. A current copy of your driving record from your state, plus details of citations, collisions, suspensions, and any DUI.
- Court records. Final dispositions for any arrest, citation, or court matter the form asks about.
- Military records. Separation documents and any disciplinary records, if you served.
- Financial and civil records. Current status of judgments, collections, or court-ordered obligations, with proof of payments or agreements, if the form asks.
- Prior applications. Copies of earlier public-safety applications and personal history statements.
- References. Current phone numbers and email addresses, how each person knows you, and the dates you worked or served together.
- Social media. A review of your public accounts, including old usernames still connected to you.
Find and resolve discrepancies
Your résumé, initial application, supplemental answers, personal history statement, and any earlier public-safety applications should not tell different versions of your life. Before you submit, compare them side by side:
- Do employment dates match across every document?
- Is the reason you left each job described the same way everywhere?
- Does every address and period of employment appear where the form requires it?
- Does anything on an earlier application turn out to be wrong?
If an earlier application contained an error, do not repeat it for the sake of consistency. Correct it and explain how the mistake happened.
When you genuinely cannot verify a date or number and the form allows estimates, label the answer as an estimate. Presenting a guess as a confirmed fact, then changing it later, creates a credibility question that the original detail never would have.
If you find an error after you submit, contact the investigator promptly. Identify the section, give the correct information, and explain briefly how the error happened. A short correction might read like this example:
“I listed the wrong month for my separation from my previous employer. My last day was June 18, not May 18. I confused the date I gave notice with my last day worked.”
A correction you make before the investigator finds the discrepancy looks very different from one made after you are asked about it.
Answer the question the department actually asked
Read each question in full, including its time period. Words such as ever, within the past ten years, arrested, detained, cited, convicted, used, and disciplined do not mean the same thing. One department may ask only about convictions. Another may ask about arrests, police contacts, or conduct that never led to a charge.
Instructions for juvenile, sealed, or expunged matters depend on your jurisdiction and on the form. If the scope of a question is unclear, ask the investigator or the contact named in the instructions, and keep the answer.
Disclose what the question requires whether or not you believe a record exists. The question is whether you answered honestly, not whether something could be found. Some published firefighter standards treat falsification or omissions during the hiring process as grounds for removal on their own.
Truthful disclosure does not mean writing a long confession. Explain what happened, when, what the outcome was, what responsibility you accept, and what has changed since. Leave out unrelated detail and do not shift blame.
Disqualifying standards vary by department
There is no single national standard for what disqualifies a firefighter candidate. Each department or civil-service system sets its own rules, and many evaluate individual circumstances such as how serious the conduct was, how long ago it happened, and the candidate’s age at the time.
Driving under the influence shows how much published standards can differ. Here are two examples from different departments:
- Phoenix. The Phoenix Fire Department’s Employment Guidelines (M.P. 102.03, revised June 2025) list a DUI conviction within the last 36 months as disqualifying, and state that each applicant is assessed individually.
- Columbus. The City of Columbus Background Removal Standards for Firefighter Applications list a DUI conviction within the past five years as grounds for removal, along with more than one adult OVI conviction. Time periods in those standards are calculated from the date the eligibility list was established.
These are examples of how two departments set their own standards, not general rules. Confirm the current standards of the department where you are applying, because published documents can be revised.
Reaching the end of a minimum waiting period also does not erase an incident. Departments still look at the pattern of your record since then.
During the investigation
- Prepare your references. Tell each one which department may call and remind them of the dates and setting in which you knew each other.
- Expect a detailed interview. Investigators often walk through the packet section by section and stop where dates, records, or wording do not match. Answer the specific question and address any gap directly.
- Respond promptly. Return requests for records quickly and monitor the phone number and email address you provided, including your junk folder.
- Report changes. Tell the department about changes to your address, employment, or legal or driving status while the process is open, as its instructions require.
- Prepare for a truth-verification step if the department uses one. Review your packet beforehand and correct any material omission before the examination.
- Expect waiting. Outside records from employers, courts, schools, and military repositories can take weeks. If the investigator’s timeline passes without an update, a brief message asking whether anything else is needed is reasonable.
The goal is a file in which the department finds the same person in your records that it met in the interviews. Gathering your records early, correcting your own mistakes, and answering each question completely is the part of that work you control. If you are still mapping the rest of the process, the firefighter hiring process explained covers each stage in order.
Sources
- Phoenix Fire Department, Employment Guidelines, M.P. 102.03 (revised June 2025)
- City of Columbus, Background Removal Standards for Firefighter Applications
- Seattle Fire Department, Hiring Process