Having your bank account number and routing number does present a security risk, as these numbers are printed on every physical check and are required for legitimate electronic transactions like direct deposits and automated clearing house payments. With these numbers, unauthorized individuals or fraudulent merchants could potentially initiate unauthorized electronic debits or ACH withdrawals from your account. However, federal regulations and bank consumer protection policies provide robust safeguards, limiting your financial liability for unauthorized transactions provided you monitor your statements regularly and report suspicious activity to your financial institution promptly. Implementing account alerts and utilizing secure banking channels significantly minimizes these potential risks.