Company: MSEX
Filing Date: 2025-07-29
Form Type: 424B5
Source: 0001104659-25-071727
Chunk: 11

Company: MIDDLESEX WATER CO
Filing Date: 2025-07-29
Form: 424B5
Chunk 11
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 with it, which means that we can disclose important information to you by referring
you to these documents. The information incorporated by reference is considered to be a part of this prospectus supplement and the accompanying
prospectus, except for information incorporated by reference that is modified or superseded by information contained in this prospectus
supplement or in any other subsequently filed document that also is incorporated by reference herein. Information we file later with
the SEC will automatically update and supersede the information in this Prospectus Supplement and in documents incorporated by reference.
We incorporate by reference the documents listed below:

<div align='center'>S-7</div>

| · | All                                                                                              
 documents filed by the Company after the date of this prospectus supplement pursuant to Sections 
 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the termination of the offering          
 of the securities covered by this prospectus supplement, except as to any portion of any         
 future report or document that is not deemed filed under such provisions.                        |

Upon request, we will provide,
without charge, to each person (including any beneficial owner) to whom a copy of this prospectus is delivered, a copy of the documents
incorporated by reference into this prospectus. You may request a copy of these filings, and any exhibits we have specifically incorporated
by reference as an exhibit in this prospectus, at no cost by writing or telephoning us at the following:

Middlesex Water Company 485C
Route 1 South, Suite 400, Iselin, New Jersey 08830, 732- 634-1500.

<div align='center'>S-8

THE MIDDLESEX WATER COMPANY INVESTMENT PLAN</div>

PURPOSE

| 1. | What is the purpose of the Plan? |

The purpose of the Middlesex
Water Company Investment Plan (the “Plan”) is to promote long-term stock ownership among existing and new investors in Middlesex
Water Company (“Middlesex” or the “Company”) by providing a convenient and economical method to purchase shares
of the Company’s Common Stock, no par value (“Common Stock”) directly and reinvest cash dividends in shares of Common
Stock without payment of a brokerage commission. We reserve the right to modify, suspend or terminate participation in the Plan by otherwise
eligible holders of Common Stock or new investors in order to eliminate practices which we determine, in our sole discretion, to be inconsistent
with the purposes of the Plan. Unless