MIDDLESEX WATER CO

Our rates charged to customers for utility services, the quality of the services we provide and certain other matters are regulated by the NJBPU and DEPSC (collectively, the Public Utility Commissions).

Our USA, USA-PA and White Marsh subsidiaries are not regulated public utilities as related to rates and service quality. However, they are subject to federal and state environmental regulations with respect to water quality and wastewater effluent quality to the extent such services are provided.

We are subject to environmental and water quality regulation by the following regulatory agencies (collectively, the Government Environmental Regulatory Agencies):

In addition, our issuances of equity securities are subject to the prior approval of the NJBPU and require registration with the United States Securities and Exchange Commission. Our issuances of long-term debt securities are subject to the prior approval of the respective state Public Utility Commissions.

Regulation of Rates and Services

For regulated rate setting purposes, we account separately for our regulated utility operations to facilitate independent rate setting by the applicable Public Utility Commissions.

In determining our regulated utility rates, the respective Public Utility Commissions consider the revenue, expenses and utility infrastructure used and useful in providing service to the public. Rate determinations by the respective Public Utility Commissions do not guarantee achievement by our regulated utility companies of specific rates of return for our regulated utility operations. Thus, we may not achieve the rates of return authorized by the Public Utility Commissions. In addition, there can be no assurance that any future rate increases will be granted or, if granted, that they will be in the amounts requested.

Middlesex Rate Matters

In February 2024, Middlesex’s petition to the NJBPU, filed in May 2023, seeking permission to increase its base water rates was concluded, based on a negotiated settlement that is expected to increase annual operating revenues by $15.4 million effective March 1, 2024. The approved tariff rates were designed to recover increased operating costs as well as a return on invested capital of $563.1 million, based on an authorized return on common equity of 9.6%. Middlesex has made capital infrastructure investments to ensure prudent upgrade and replacement of its utility assets to support continued regulatory compliance, resilience and overall quality of service. Net proceeds from the settlement of Middlesex’s 3M Company (3M) lawsuit were used to recover costs for the construction of the Park Avenue Plant PFAS treatment upgrades, including depreciation and carrying costs. The rate case settlement will result in the reclassification of $48.3 million from Regulatory Liabilities to Contributions in Aid of Construction in the March 31, 2024 balance sheet. The Company will also record in the first quarter of 2024 the recovery of $0.7 million and $2.4 million of prior year depreciation and carrying costs, respectively, as well as the recovery of $1.4 million of prior year costs which were associated with the interim solution to comply with the Notice, all of which were approved in the rate case settlement.

For further information on the 3M settlement agreement, seeItem 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations**,Regulatory Notice of Non-Compliance andRegulatory Matters.

In January 2024, the NJBPU approved Middlesex’s petition for the proposed cost recovery of its Lead Service Line Replacement (LSLR) Plan and cost recovery of project costs associated with replacing Middlesex customer-owned lead service lines. Replacement of Middlesex and Middlesex customer-owned lead service lines is required by the New Jersey LSLR Law. Under this legislation, the costs associated with replacing customer-owned lead service lines are recoverable through future customer surcharges. Cost recovery for replacing Company-owned lead service lines are recoverable through traditional base rate case filings. The current estimates for replacement of Middlesex and Middlesex customer-owned lead service lines are approximately $46 million to $77 million over a nine-year period.

In October 2023, the NJBPU approved Middlesex’s petition for a Distribution System Improvement Charge (DSIC) Foundation Filing, which is a prerequisite to implementing a DSIC rate that allows water utilities to recover investments in, and generate a return on, qualifying capital improvements to their water distribution system made between base rate proceedings. Middlesex is authorized to recover DSIC revenues up to five percent (5%) of total revenues established in Middlesex’s 2021 base rate proceeding, or approximately $5.5 million. Semi-annually, beginning in April 2024, the Company must file for a change in its DSIC rate seeking recovery for DSIC-eligible investments made during the period. DSIC rates remain in effect until Middlesex’s next base rate case increase subsequent to the March 1, 2024 increase. Under the terms of the Foundational Filing, the Company is required to file a base rate petition before November 2026.

In September 2022, the NJBPU approved Middlesex's Emergency Relief Motion to reset its Purchased Water Adjustment Clause (PWAC) tariff rate to recover additional costs of $2.7 million for the purchase of treated water from a non-affiliated water utility. A PWAC is a rate mechanism that allows for recovery of increased purchased water costs between base rate case filings. The increase, effective October 1, 2022, was on an interim basis and subject to refund with interest, pending final resolution of this matter, which the NJBPU provided in August 2023. In connection with the full recovery of the $2.7 million of additional costs, Middlesex reset its PWAC rate to zero in October 2023.

In December 2021, Middlesex’s petition to the NJBPU seeking permission to increase its base water rates was concluded, based on a negotiated settlement, resulting in an expected increase in annual operating revenues of $27.7 million. The approved tariff rates were designed to recover increased operating costs, as well as a return on invested capital of $513.5 million, based on an authorized return on common equity of 9.6%. The increase was implemented in two phases with $20.7 million of the increase effective January 1, 2022 and the remaining $7.0 million effective January 1, 2023. As part of the negotiated settlement, the PWAC was reset to zero.

Tidewater Rate Matters

In December 2023, the DEPSC approved Tidewater’s application to implement a new DSIC. Effective January 1, 2024, Tidewater implemented a DSIC rate of 3.71%, which is expected to generate revenue of approximately $1.3 million annually. A Delaware DISC is subject to a semi-annual reset with an overall maximum rate of 7.5%.

In October 2023, the DEPSC issued an Order that made a temporary base rate reduction permanent. The initial DEPSC order required Tidewater to reduce its base rates charged to general metered and private fire customers by 6.0%, effective for service rendered on and after September 1, 2022. The rate reduction was ordered as a result of Tidewater earning in excess of its authorized return, and resulted in reduced annual revenues of approximately $2.1 million in 2023.

In March 2021, Tidewater was notified by the DEPSC that it had determined Tidewater’s earned rate of return exceeded the rate of return authorized by the DEPSC. Consequently, Tidewater reset its DSIC rate to zero effective

April 1, 2021 and refunded approximately $1.0 million to customers primarily in the form of an account credit for DSIC revenue previously billed between April 1, 2020 and March 31, 2021.

Pinelands Rate Matters

In April 2023, Pinelands Water and Pinelands Wastewater concluded their base rate case matters when the NJBPU approved a combined $1.0 million increase in annual base rates, effective April 15, 2023. The requests were necessitated by capital infrastructure investments the companies have made as well as increased operations and maintenance costs.

Southern Shores Rate Matters

Effective January 1, 2020, the DEPSC approved the renewal of a multi-year agreement for water service to a 2,200 unit condominium community we serve in Sussex County, Delaware. Under the agreement, current rates were to remain in effect until December 31, 2024, unless there are unanticipated capital expenditures or regulatory related changes in operating expenses exceeding certain thresholds during this time period. In 2022, capital expenditures did exceed the established threshold and rates were increased by 5.39%, effective January 1, 2023. Beginning in 2025 and thereafter, inflation-based rate increases cannot exceed the lesser of the regional Consumer Price Index or, 3%. Inflation based increases are in addition to the threshold rate increases. This agreement expires on December 31, 2029.

Future Rate Filings

Management monitors the need for rate relief for our regulated entities on an ongoing basis. When capital improvements and/or increases in operation, maintenance or other costs indicate a need for rate relief, base rate increase requests are filed with the respective Public Utility Commissions.

Regulatory Service Matters

Twin Lakes Utilities, LLC (Twin Lakes) provides water services to approximately 115 residential customers in Shohola, Pennsylvania. Pursuant to the Pennsylvania Public Utility Code, Twin Lakes filed a petition requesting the Pennsylvania Public Utilities Commission (PAPUC) to order the acquisition of Twin Lakes by a capable public utility. The PAPUC assigned an Administrative Law Judge (ALJ) to adjudicate the matter and submit a recommended decision (Recommended Decision) to the PAPUC. As part of this legal proceeding the PAPUC also issued an Order in January 2021 appointing a large Pennsylvania based investor-owned water utility as the receiver (the Receiver Utility) of the Twin Lakes system until the petition is fully adjudicated by the PAPUC. In November 2021, the PAPUC issued an Order affirming the ALJ’s Recommended Decision, ordering the Receiver Utility to acquire the Twin Lakes water system and for Middlesex, the parent company of Twin Lakes, to submit $1.7 million into an escrow account within 30 days. Twin Lakes immediately filed a Petition For Review (PFR) with the Commonwealth Court of Pennsylvania (the Commonwealth Court) seeking reversal and vacation of the escrow requirement on the grounds that it violates the Pennsylvania Public Utility Code as well as the United States Constitution. In addition, Twin Lakes filed an emergency petition for stay of the PAPUC Order pending the Commonwealth Court’s review of the merits arguments contained in Twin Lakes’ PFR. In December 2021, the Commonwealth Court granted Twin Lakes’ emergency petition, pending its review. In August 2022, the Commonwealth Court issued an opinion upholding PAPUC’s November 2021 Order in its entirety. In September 2022, Twin Lakes filed a Petition For Allowance of Appeal (Appeal Petition) to the Supreme Court of Pennsylvania seeking reversal of the Commonwealth Court’s decision to uphold the escrow requirement on the grounds that the Commonwealth Court erred in failing to address Twin Lakes’ claims that because the $1.7 million escrow requirement placed on Middlesex violated Middlesex’s constitutional rights, Middlesex’s refusal to submit this escrow payment would jeopardize the relief Twin Lakes was otherwise entitled to in the appointment of the Receiver Utility. In March 2023, the Supreme Court of Pennsylvania issued a decision denying Twin Lakes’ Appeal Petition without addressing this claim on the merits. As a result of the Pennsylvania Courts’ failure to address Twin Lakes’ claim, Middlesex subsequently filed a Complaint with the United States District Court for the Middle District of Pennsylvania to address the issue of whether the PAPUC’s Order violated Middlesex’s rights under the

United States Constitution. On January 18, 2024, the District Court issued an Order dismissing Middlesex’s Complaint without addressing the issue of whether the PAPUC’s Order violated Middlesex’s rights under the United States Constitution. On January 31, 2024, Middlesex filed a Notice of Appeal of the District Court’s decision with the United States Court of Appeals for the Third Circuit.

The financial results, total assets and financial obligations of Twin Lakes are not material to Middlesex.

Water and Wastewater Quality and Environmental Regulations

Government environmental regulatory agencies regulate our operations in New Jersey and Delaware with respect to water supply, treatment and distribution systems and the quality of the water. They also regulate our operations with respect to wastewater collection, treatment and disposal.

Regulations relating to water quality require us to perform tests to ensure our water meets state and federal quality requirements. In addition, government environmental regulatory agencies continuously review current regulations governing the limits of certain organic compounds found in the water as byproducts of the treatment process. We participate in industry-related research to identify technologies that may reduce the level of organic, inorganic and synthetic compounds found in water. The cost to water utilities to comply with any proposed water quality standards depends in part on the limits set in the regulations and on the method selected to treat the water to the required standards. We regularly test our water to determine compliance with government environmental regulatory agencies’ water quality standards.

In September 2021, the NJDEP issued a Notice of Non-Compliance (Notice) to Middlesex based on self-reporting by Middlesex that the level of Perfluorooctanoic Acid (PFOA) in water treated at its Park Avenue Plant in South Plainfield, New Jersey exceeded a standard promulgated in a NJDEP regulation that became effective in 2021. Middlesex was required by the regulation to notify its affected customers and complied within the required Notice period in November 2021.

The Notice further required the Company to take any action necessary to comply with the new standard by September 7, 2022. Consequently, in November 2021, the Company implemented an interim solution to meet the Notice requirements, which included putting the Park Avenue Wellfield Treatment Plant in off-line status and obtaining alternate sources of supply. In June 2022, the Company accelerated the in-service date for a portion of the enhanced treatment project based on engineering analysis that allowed a restart of the Park Avenue Wellfield Treatment Plant to ensure continued compliance with all state and federal drinking water standards.

On September 13, 2022, the Company entered into an Administrative Consent Order (ACO) with the NJDEP, which required the Company to take whatever actions necessary to achieve and maintain compliance with applicable regulations. As prescribed in the ACO, the Company was to issue periodic public notifications until the ACO was closed.

In June 2023, the Company completed the permanent construction of the entire Park Avenue Plant treatment upgrades and placed the upgrades into operation in full compliance with the NJDEP PFOA standards. In October 2023, the Company received confirmation from the NJDEP that it has complied with all requirements of the ACO and consequently, the ACO has been closed.

In addition to the enhanced groundwater treatment process for PFOA, we treat the groundwater supplies in our Middlesex System with chlorination for primary disinfection purposes and use air stripping for removal of volatile organic compounds.

Surface water treatment in our Middlesex System is by conventional treatment; coagulation, sedimentation and filtration. The treatment process includes pH adjustment, ozone and chlorination for disinfection, and corrosion control for the distribution system.

Treatment of groundwater in our Tidewater System is by chlorination for disinfection purposes and, in some cases, pH adjustment and filtration for nitrate and iron removal and granular activated carbon filtration for organics removal. Chloramination is used for final disinfection at Southern Shores.

Treatment of groundwater in the Pinelands Water and Fortescue Systems (primary disinfection only) is performed at individual well sites.

Treatment of wastewater in the Pinelands Wastewater System includes the use of rotating biological contactors.

The NJDEP and DEDPH monitor our activities and review the results of water quality tests that are performed for adherence to applicable regulations. Other applicable regulations include the Lead, Copper and Lead Service Line Rules, the Federal Surface Water Treatment Rule and the Federal Total Coliform Rule and regulations for maximum contaminant levels established for various volatile organic compounds.

The Company must comply with various environmental laws and regulations promulgated by the USEPA, NJDEP and other governmental agencies, including the Toxic Catastrophe Prevention Act, the Spill Prevention, Control, and Countermeasure Rule and the Discharge Prevention Program of the New Jersey Spill Compensation and Control Act.