Document and Entity Information |
Sep. 04, 2019 |
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| Cover [Abstract] | |
| Entity Registrant Name | CONNECTICUT WATER SERVICE INC / CT |
| Amendment Flag | false |
| Entity Central Index Key | 0000276209 |
| Document Type | 8-K |
| Document Period End Date | Sep. 04, 2019 |
| Entity Incorporation State Country Code | CT |
| Entity File Number | 0-8084 |
| Entity Tax Identification Number | 06-0739839 |
| Entity Address, Address Line One | 93 West Main Street |
| Entity Address, City or Town | Clinton |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06413 |
| City Area Code | 860 |
| Local Phone Number | 669-8636 |
| Security 12b Title | Common Stock, without par value |
| Trading Symbol | CTWS |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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