Company: MSEX
Filing Date: 2025-05-12
Form Type: S-3ASR
Source: 0001104659-25-047075
Chunk: 1

Company: MIDDLESEX WATER CO
Filing Date: 2025-05-12
Form: S-3ASR
Chunk 1
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 registration statement number of the earlier effective registration statement for the same offering.¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.x

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.¨

Indicate by check mark whether the registrant is
a large accelerated filer, an accelerated filer, a non-accelerated filer, a small reporting company, or an emerging growth company. See
the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and
“emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer: x                     | Accelerated filer: ¨         |
| Non-accelerated filer: ¨                       | Smaller reporting company: ¨ |
|                                                | Emerging growth company: ¨   |
| (Do not check if  a smaller reporting company) |                              |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(b) of the Securities Act.¨

PROSPECTUS

<div align='center'>Middlesex Water Company

CommonStock</div>

From time to time, we may
offer, issue and sell shares of our Common Stock in one or more offerings.

This prospectus provides a
general description of the securities we may offer. When we offer securities, we will provide specific terms of the securities offered
in a supplement to this prospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with
these offerings. The prospectus supplement and any related free writing prospectus may also add, update or change information contained
in this prospectus. You should carefully read this prospectus, the applicable prospectus supplement and any related free writing prospectus,
as well as any documents incorporated by reference, before you invest in any of the securities being offered.

Our Common Stock is traded
on The NASDAQ Global Select Market under the symbol “MSEX”.

We may offer and