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Connecticut Remediation Standard Regulations

Connecticut's Remediation Standard Regulations (RSRs) provide detailed standards that may be used at any site to determine whether or not remediation of contamination is necessary to protect human health and the environment.

Remediation Standard Regulations Fact Sheet

Remediation Standard Regulations, as amended June 27, 2013
[This version contains the RSRs only. Please see the Environmental Land Use Restrictions webpage for the revised ELUR regulations.  Effective July 1, 2017, the Connecticut eRegulations System shall serve as the official version of the Regulations of Connecticut State Agencies and the electronic repository for the regulation-making record. Final approved regulations will no longer be printed in the Connecticut Law Journal.

 RSRs Proposed Amendments    Variances under the RSRs      Additional Information

RSRs Proposed Amendments

The Remediation Division of the Bureau of Water Protection and Land Reuse is proposing revisions to Section 22a-133k-1 through 22a-133k-3 of the Regulations of Connecticut State Agencies, Remediation Standard Regulations (RSRs).  The RSRs specify the standards for the remediation of environmental pollution in soil and groundwater.

The RSRs have been in place since 1996 and were first revised in 2013, referred to as "Wave 1." The current proposed revisions are known as "Wave 2."  Beginning in August 2013, the Department began releasing Draft Discussion Documents containing concepts for potential future amendments to the RSRs and new provisions for the RSRs, as part of Wave 2.  DEEP presented proposed concepts in the RSR Wave 2 Conceptual Language document, as well as at multiple question and answer sessions in April 2016, and accepted public feedback through May 6, 2016.  Based on the external comments provided to DEEP and internal review of the April 2016 RSR Wave 2 Conceptual Language document, the Revised RSR Wave 2 Conceptual Language document was generated in August 2016.  Documents related to the evaluation of risk-based decision-making may also be found on the Draft Discussion Document webpage.  Since late 2016, the Remediation Division has worked with DEEP legal counsel to improve the language, consistency, and organization of the proposed amendments.  The majority of the amendments allow for faster cleanups and increased predictability of remedial outcomes while continuing to protect human health and the environment.

Proposed Revised Remediation Standard Regulations – These are the 2019 Proposed RSRs submitted for public notice.  The public notice process will last 90 days, during which formal comments may be submitted in writing through the eRegulations website or to Brian Thompson at DEEP, Bureau of Water Protection and Land Reuse, Remediation Division, 2nd Floor, 79 Elm Street, Hartford, Connecticut 06106-5127 or at

Summary of Changes – This document summarizes the major changes made in the 2019 proposed RSRs, and the page numbers listed accompany the Red-Line/Blue-Line version of the proposed RSRs (linked below).

Red-Line/Blue-Line version of Proposed Revised Remediation Standard Regulations – This document contains deleted/moved language in blue text and added/moved language in red text. Accompanying this document is the Alternative Groundwater Protection Criteria Map (PDF) in viewable format.  This version of the Revised RSRs is unofficial and made available for the convenience of the reader.  The official version submitted is available in the eRegulations link above on the Secretary of State website.

To ensure that DEEP’s regulatory amendment proposal is clearly articulated to the various stakeholders, DEEP will be offering informational meetings as follows (subject to additions/changes):

 Presentation  Date  Time  Location
Presentation to EBC on Proposed Revised RSRs June 11, 2019 8:00-10:30 am
107 Selden St.
Berlin, CT
Kick-off Presentation on Proposed Revised RSRs July 9, 2019 1:30 – 3:00 pm Auditorium, DEEP Headquarters
79 Elm St., Hartford
Informational Question and Answer Session July 30, 2019 9:30 – 11:30 am Auditorium, DEEP Headquarters
79 Elm St., Hartford
Informational Question and Answer Session August 6, 2019 1:30 – 3:30 pm Kellogg Environmental Center, 500 Hawthorne Ave., Derby
Informational Question and Answer Session September 11, 2019 5:00 - 7:00 pm Sheraton Hartford South Hotel, 100 Capital Blvd., Rocky Hill
Public Hearing September 25, 2019 1:00 Auditorium, DEEP Headquarters
79 Elm St., Hartford

Schedule of Formal Process:

  1. Public Notice of Intent to Secretary of State, beginning the formal public comment period: July 8, 2019 
  2. Public Hearing: September 25, 2019
  3. Close of public comment period: 5:00 pm, October 7, 2019
  4. Hearing Officer’s Report
  5. DEEP notification to all interested parties of availability of final wording
  6. Final proposed regulations to Attorney General for Legal Sufficiency approval
  7. Final proposed regulations to Office of Fiscal Analysis and Environment Committee
  8. Legislative Regulation Review Committee (LRRC) holds meeting on regulatory amendments per CGS section 4-170
  9. After approval of LRRC, regulations filed with Secretary of State per CGS section 4-172 (regulations become final upon filing)
  10. Publication of regulations on the Connecticut eRegulations System

Variances Under the RSRs

Remediation Standard Regulations Approval Request or Notice Transmittal Form (Word / PDF) and Instructions  (PDF) - provides a checklist of variances requiring approval from DEEP or notice to DEEP.

Environmental Land Use Restrictions

Engineered Control Variances

Technical Impracticability Variance

Covenant Not to Sue

Guidance Document for Rendering Soil Inaccessible Using Pavement 


Additional Information

Transmittal of Documents - Instructions and forms for use in electronic and hardcopy submittals.

Remediation Standard Regulations Presentation (April 2019) - PowerPoint presentation developed for EPOC's RSR course

Trichloroethylene (TCE) Developmental Risks - joint guidance from DPH and DEEP (Feb 2015)

Emerging Contaminants

Green Remediation

Regulatory Clarification: Asphalt Millings are Not Clean Fill (October 2006)

1996 Criteria Derivation - Technical Supporting information on the derivation of the risk-based criteria from the 1996 Remediation Standards Regulations

Technical Support Document for Extractable Petroleum Hydrocarbon Fractions Using the ETPH Analytical Method and Criteria Development (PDF)

Connecticut Water Quality Standards - The RSRs were developed to be consistent with the Water Quality Standards and incorporate specific references to them.
Legislative Summaries - Provides a recent history of legislation affecting Remediation Programs
Method for Estimating the 7-Day, 10-Year Low Flow of Streams in Connecticut (1982)  - Provides guidance for the self-implementing Alternative SWPC calculation specified in the RSRs section 22a-133k-3(b)(3)(A)

Content last updated July 17, 2019