995301 - Statement - CONSOLIDATED STATEMENTS OF INCOME link:presentationLink link:definitionLink link:calculationLink 995302 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:definitionLink link:calculationLink 995303 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 995304 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:definitionLink link:calculationLink 995305 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 995306 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT link:presentationLink link:definitionLink link:calculationLink 995307 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 995308 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY link:presentationLink link:definitionLink link:calculationLink 995309 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 995310 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments link:presentationLink link:definitionLink link:calculationLink 995311 - Disclosure - Rate and Regulatory Matters link:presentationLink link:definitionLink link:calculationLink 995312 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 995313 - Disclosure - Commitments and Contingent Liabilities link:presentationLink link:definitionLink link:calculationLink 995314 - Disclosure - Short-Term Borrowings link:presentationLink link:definitionLink link:calculationLink 995315 - Disclosure - Capitalization link:presentationLink link:definitionLink link:calculationLink 995316 - Disclosure - Employee Benefit Plans link:presentationLink link:definitionLink link:calculationLink 995317 - Disclosure - Business Segment Data link:presentationLink link:definitionLink link:calculationLink 995318 - Disclosure - Quarterly Data - Unaudited link:presentationLink link:definitionLink link:calculationLink 996000 - Disclosure - Accounting Policies, by Policy (Policies) link:presentationLink link:definitionLink link:calculationLink 996001 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Tables) link:presentationLink link:definitionLink link:calculationLink 996002 - Disclosure - Rate and Regulatory Matters (Tables) link:presentationLink link:definitionLink link:calculationLink 996003 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 996004 - Disclosure - Commitments and Contingent Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 996005 - Disclosure - Short-Term Borrowings (Tables) link:presentationLink link:definitionLink link:calculationLink 996006 - Disclosure - Capitalization (Tables) link:presentationLink link:definitionLink link:calculationLink 996007 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:definitionLink link:calculationLink 996008 - Disclosure - Business Segment Data (Tables) link:presentationLink link:definitionLink link:calculationLink 996009 - Disclosure - Quarterly Data - Unaudited (Tables) link:presentationLink link:definitionLink link:calculationLink 996010 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) link:presentationLink link:definitionLink link:calculationLink 996011 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of Range of Depreciation Rates for the Major Utility Plant Categories link:presentationLink link:definitionLink link:calculationLink 996012 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of AFUDC Rates for Middlesex and Tidewater link:presentationLink link:definitionLink link:calculationLink 996013 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of Operating Revenues link:presentationLink link:definitionLink link:calculationLink 996014 - Disclosure - Rate and Regulatory Matters (Details) link:presentationLink link:definitionLink link:calculationLink 996015 - Disclosure - Rate and Regulatory Matters (Details) - Schedule of Regulatory Assets link:presentationLink link:definitionLink link:calculationLink 996016 - Disclosure - Income Taxes (Details) - Schedule of Income Tax Expense (Benefit) link:presentationLink link:definitionLink link:calculationLink 996017 - Disclosure - Income Taxes (Details) - Schedule of Income Tax Expense (Benefit) is Comprised link:presentationLink link:definitionLink link:calculationLink 996018 - Disclosure - Income Taxes (Details) - Schedule of Net Deferred Tax Liability link:presentationLink link:definitionLink link:calculationLink 996019 - Disclosure - Commitments and Contingent Liabilities (Details) link:presentationLink link:definitionLink link:calculationLink 996020 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of Purchased Water Costs link:presentationLink link:definitionLink link:calculationLink 996021 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of Operating Lease ROU Assets link:presentationLink link:definitionLink link:calculationLink 996022 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of Future Minimum Operating Lease Commitments link:presentationLink link:definitionLink link:calculationLink 996023 - Disclosure - Short-Term Borrowings (Details) link:presentationLink link:definitionLink link:calculationLink 996024 - Disclosure - Short-Term Borrowings (Details) - Schedule of Information Regarding Short-Term Borrowings link:presentationLink link:definitionLink link:calculationLink 996025 - Disclosure - Short-Term Borrowings (Details) - Schedule of Bank Lines of Credit link:presentationLink link:definitionLink link:calculationLink 996026 - Disclosure - Capitalization (Details) link:presentationLink link:definitionLink link:calculationLink 996027 - Disclosure - Capitalization (Details) - Schedule of Long-Term Debt link:presentationLink link:definitionLink link:calculationLink 996028 - Disclosure - Capitalization (Details) - Schedule of Basic and Diluted Earnings Per Share link:presentationLink link:definitionLink link:calculationLink 996029 - Disclosure - Capitalization (Details) - Schedule of Basic and Diluted Earnings Per Share (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 996030 - Disclosure - Capitalization (Details) - Schedule of Carrying Amount and Fair Value of the Bonds link:presentationLink link:definitionLink link:calculationLink 996031 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:definitionLink link:calculationLink 996032 - Disclosure - Employee Benefit Plans (Details) - Schedule of Pension Plan and Other Benefits Plan link:presentationLink link:definitionLink link:calculationLink 996033 - Disclosure - Employee Benefit Plans (Details) - Schedule of Change in Fair Value of Plan Assets link:presentationLink link:definitionLink link:calculationLink 996034 - Disclosure - Employee Benefit Plans (Details) - Schedule of Employee Benefit Plans Recognized in Balance Sheet link:presentationLink link:definitionLink link:calculationLink 996035 - Disclosure - Employee Benefit Plans (Details) - Schedule of Components of Net Benefit Cost link:presentationLink link:definitionLink link:calculationLink 996036 - Disclosure - Employee Benefit Plans (Details) - Schedule of Regulatory Assets into Net Periodic Benefit Cost link:presentationLink link:definitionLink link:calculationLink 996037 - Disclosure - Employee Benefit Plans (Details) - Schedule of Discount and Compensation Rates link:presentationLink link:definitionLink link:calculationLink 996038 - Disclosure - Employee Benefit Plans (Details) - Schedule of Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates link:presentationLink link:definitionLink link:calculationLink 996039 - Disclosure - Employee Benefit Plans (Details) - Schedule of Expected Benefit Payments link:presentationLink link:definitionLink link:calculationLink 996040 - Disclosure - Employee Benefit Plans (Details) - Schedule of Allocation of Plan Assets link:presentationLink link:definitionLink link:calculationLink 996041 - Disclosure - Employee Benefit Plans (Details) - Schedule of Fair Value of Plan Assets link:presentationLink link:definitionLink link:calculationLink 996042 - Disclosure - Employee Benefit Plans (Details) - Schedule of Table Presents Awarded But not Yet Vested Share link:presentationLink link:definitionLink link:calculationLink 996043 - Disclosure - Business Segment Data (Details) link:presentationLink link:definitionLink link:calculationLink 996044 - Disclosure - Business Segment Data (Details) - Schedule of Segment Reporting Information, by Segment link:presentationLink link:definitionLink link:calculationLink 996045 - Disclosure - Quarterly Data - Unaudited (Details) - Schedule of Financial Information for each Quarter link:presentationLink link:definitionLink link:calculationLink 000 - Document - Document And Entity Information link:presentationLink link:definitionLink link:calculationLink