ZIP 01730
Middlesex County, MA

The heaviest year

1979 is the heaviest year on file: 21 paid claims, 18.1% of the ZIP's total. The rest is spread across the other 23 years on file. The largest named event in the record is Not a named storm, with 24 claims.

4 of those claims — 3.4% — were filed since 2017. The bulk of this ZIP's record is older than that.

Named event	Paid claims	Share of record
Not a named storm	24	20.7%
March 2010 Nor'easter	20	17.2%

Where the claims sat on the map

Of the 115 claims here that record a rated flood zone, 59 — 51.3% — were on properties rated outside the mapped high-risk area, in a B, C or X zone. Most of the paid flooding in this ZIP happened to properties the maps did not treat as high risk. Flood insurance is not required outside the high-risk zone, and most properties there do not carry it — so these counts come from the minority who did.

The water near this ZIP

The closest gauges publishing official flood thresholds are Shawsheen River at Wilmington (5.8 mi), Charles River at Waltham (9.1 mi) and Concord River at Lowell (9.6 mi). A gauge describes one point on one river — it will not see street drainage, sewer backup, storm surge or flash flooding.

Read current gauge conditions for 01730 →

What this does not say

These are paid National Flood Insurance Program claims, nothing more. They count insured properties whose owners filed and were paid, so they are a floor on how often this ZIP has flooded — never a measure of how likely it is to flood next. Uninsured flooding leaves no trace here at all.

The figures are aggregates published by FEMA. No individual claim, address or policyholder appears on this page or in the data behind it. Nothing here is a forecast, a warning, or advice about insurance.