Nassau County AROW Guide: How Assessment Review on the Web Works
A plain-English guide to Nassau County AROW: registration, property lookup, Sales Locator, filing, status tracking, and confirmation of your assessment appeal.
Reviewed by Stephen Ambrosio · Updated October 7, 2026What is AROW?
AROW stands for Assessment Review on the Web. It is Nassau County ARC’s online system for assessment appeals. Nassau County says homeowners can use AROW to file an appeal, track status, search residential sales, and view information on past and pending appeals.
What can you do before filing season?
The public inquiry and residential Sales Locator are available outside the filing window. Registration is required to file an appeal, but Nassau County says you can use the Sales Locator and public inquiry functions without registering.
A simple AROW workflow
- Locate the correct property by address or parcel information.
- Review the property, assessment, and dwelling information shown for the property.
- Use the Sales Locator if you want to evaluate recent residential sales.
- During filing season, complete the appeal application and submit it before the deadline.
- Save the appeal/application number and confirmation email.
- Use AROW later to check status and respond to ARC notices when applicable.
Do you have to use the Sales Locator?
No. Nassau County’s FAQ says the Sales Locator is optional. A homeowner may go directly to the filing feature. However, reviewing recent sales can be useful when evaluating whether the County’s value appears supportable.
One practical mistake to avoid
Do not assume the assessment number itself is the same thing as the home’s current market value. Nassau assessment terminology can be confusing. Before selecting sales or making a requested-value argument, understand the difference between full market value, assessed value, and the applicable level of assessment.
Official filing dates and procedural references are based on current Nassau County Assessment Review Commission and Department of Assessment materials. County notices and rules control if they change. Educational information is not a guarantee of a reduction.
Reviewed by Stephen Ambrosio
A Long Island homeowner who filed his own Suffolk County property tax grievance in Northport and won a $1,411 annual reduction. Stephen helped build GrieveItNow to make the process more accessible to other homeowners. For Nassau County clients, he helps manage property research, comparable-sales analysis, ARC filing preparation, and client communication from signup through outcome.