Water Diversion Reporting

Any person or business that is authorized to use more than 50,000 gallons a day in a 24-hour period is required to submit an annual report with daily water use, regardless of if water was used in a given year or not. There are two main types of authorizations for water diversions: registrations and permits. If you are unsure which type of authorization you have, visit the Water Diversion Registration or Permit page.

What is Required?

Regardless of whether or not a person or business has a water diversion registration or permit, an annual report with operating data is required using the Annual Water Use Reporting Form (2025 Update).

Registered Water Diversions

Those that registered their diversions in 1983 pursuant to Section 22a-368 of the Connecticut General Statutes are required to report their operating data pursuant to Section 22a-368a on the Annual Water Use Reporting Form provided below. Annual water use reports for water diversion registrations are due January 31st of each year for the previous calendar year. This is a newer process that began in 2020. View the Water Diversion Registration Reporting Frequently Asked Questions to learn more.

An Annual Water Use Reporting Form should be sent to DEEP.WaterUseReport@ct.gov for each water diversion registration, regardless of if the status is active, inactive, or emergency.

If a registration is no longer in use, water diversion registrants should submit a Surrender Form. Once a Surrender Form is submitted for an out-of-use water diversion registration, reporting is no longer required.

Permitted Water Diversions

Holders of water diversion permits are required to file annual water diversion reports as a condition of their permit using the same form provided below for registered diverters as discussed above. Separate forms should be completed for each authorized diversion as described in the permit. Water diversion permits may require additional reporting submittals, including:

• Summary of actions that support a long-range water conservation plan
• Meter calibration
• Streamflow measurements

Refer to your permit or contact DEEP.WaterUseReport@ct.gov to clarify what is required in your annual report.

If a water diversion permit is not longer in use, a form is not required to be submitted as is required for water diversion registrations. Send an email to DEEP.WaterUseReport@ct.gov detailing that the water diversion is no longer in use and DEEP will update our records.

Helpful Hints

Please make sure the following are correct before submittal:

• Make sure that you are using the most current reporting form provided in the link above
• The Excel file of the reporting form must be submitted
• The subject line of the submitted annual report email should be in the following format: “permit/registration number, permittee/registrant, 20XX annual report”

Full instructions available here: Water Use Reporting Form Instructions 

Violation Reporting

If you are required to submit a violation report by a permit condition, please use the Violation Reporting Form to detail the violation and steps taken to prevent a reoccurrence of the violation. A completed and electronically signed form may be emailed to the Consumptive Water Diversion Program at DEEP.WaterUseReport@ct.gov.

Exemptions

If you were required to obtain a permit for a non-consumptive use, such as a stream channel alteration, culvert, or pond dredging, please consult your permit for any reporting or notice requirements.  No reporting is required for a non-consumptive diversion registration such as a stream channel alteration, impoundment, or culvert. If you operate a consumptive diversion where water is withdrawn and removed from its native location but withdraw less than 50,000 gallons of water during any 24-hour period and will not exceed that daily volume, you are exempt from the requirements of the Water Diversion Policy Act and not required to report. 

Questions on annual reporting? Please contact us at DEEP.WaterUseReport@ct.gov

Return to the Water Diversion Program home page to access more information.

Content last updated September 10, 2025.