The Massachusetts Contingency Plan was significantly revised effective October 1, 1993 when a new, privatized approach was adopted. Since then, DEP has worked with private-sector Licensed Site Professionals (LSPs) to assess and cleanup sites. This page asks and answers questions about the progress of cleanups since 1993.


  • How many releases have been reported to DEP?
    Since 1984, over 47,000 releases have been reported to the Department.
  • What accounts for the most notifications: sudden releases (spills) or historic contamination?
    Two-hour notifications, primarily related to new spills, account for 50 percent of all the notifications received since 2009. The balance of notifications is split between: 120-Day notifications, generally associated with finding historic contamination at concentrations above Reportable Concentrations; and 72-Hour notifications, which include (among other conditions) leaking tanks, groundwater contamination near a public well or near/at a private well, and actual/potential impacts to indoor air.
  • Are the numbers of spills increasing each year?
    No. There has been an overall decline of all three types of notifications (2-Hour, 72-Hour and 120-Day) over time.  This trend is consistent with better environmental management practices, upgrades in underground storage tanks, and a diminishing universe of undiscovered "historic" contamination. The notable increase in 72-Hour notifications in 1999 is attributable to the discovery of contamination related to leaking underground storage tanks driven by the federal deadline for the upgrade or replacement of underground storage tanks.
  • Is the year-by-year data available to the public?
    Yes - by following this link

Releases By Notification Category

Sites Cleaned Up

  • How many sites have been cleaned up since 1993?
    34,832 sites, averaging over 1500 per year. 
  • How many sites have been cleaned for unrestricted use?
    A Permanent Solution with No Conditions has been achieved at 31,479 sites (or 90%), indicating that the site is suitable for unrestricted use. (This includes sites that have achieved Class A-1, A-2, and B-1 Response Action Outcomes – the closure categories that were in place prior to the 2014 regulatory changes.)
  • How many sites have achieved temporary solutions?
    A Temporary Solution has been achieved at 771 (2%) of the sites cleaned up to date (6/30/16). (Temporary Solutions were referred to Class C RAOs prior to Spring 2014.)
  • Is the year-by-year data available to the public?
    Yes - by following this link
  • At how many of the sites with a Permanent Solution was a deed notice or restriction (i.e., an Activity and Use Limitation) used as part of the remedy?
    Between 1994 and 2016, 6% (1,996) of Permanent Solutions included an Activity and Use Limitation (AUL) as part of the final remedy. 

Trends In The Use of AULs

  • How long does the cleanup process take?
    Over 88% of the releases from FY95 to FY10 have achieved regulatory closures in less than six years from the time of notification. For the purpose of the chart below sites with regulatory closure include those with the compliance status of: Permanent Solution with No Conditions, Permanent Solution with Conditions, Adequately Regulated, Downgradient Property Status, RTN Closed, Memorandum of Understanding (DEPMOU), Not a Disposal Site (DEPNDS), DEP No Further Action (DEPNFA), LSP No Further Action (LSPNFA), Pending Not a Disposal Site (PENNDS), Pending No Further Action (PENNFA), Special Project (SPECPR), Utility-related Abatement Measure (URAM), Waiver Completion Statement (WCSPRM).

Percentage of All Releases Achieving Regulatory Closure Within 6 Years

The chart below shows the length of time to achieve a Permanent or Temporary Solution from the time of notification by notification type (2-Hour, 72-Hour or 120-Day). The time required to achieve a Permanent or Temporary Solution is less than 6 years in the vast majority of cases and for all notification types (2 Hour - 98%, 72 Hour - 88%, 120 Day - 90%).

Time to Permanent or Temporary Solution, by Notification Category

The chart below shows the current status of notifications made in FY2010.  The chart shows that for the majority of sites for which the notification was made either a Permanent Solution has been achieved or a Permanent/Temporary Solution is not required within 6 years.  (The most common reasons why a Permanent or Temporary Solution is not required is because the notification condition has been “linked” (i.e., response actions consolidated) under another notification and release tracking number.  Other reason include the site is considered Adequately Regulated, Downgradient Property Status has been achieved or a Utility-related Abatement Measure is being conducted.)

FY10 Notifications

Immediate Response Actions

Immediate Response Actions (IRAs) are required to address any condition that triggers a 2-Hour or 72-Hour notification to the Department.  IRAs are expedited response actions that include at a minimum assessment, and where appropriate, actions to contain, isolate, or remove contamination from the environment that is the result of a release or address a threat of release.  IRAs require approval by the Department.  The chart below shows IRA approvals (both oral and written) by the Department by Fiscal Year (FY).

Immediate Response Action Approvals By Fiscal Year


  • How many audits does MassDEP conduct?
    Since FY2000 MassDEP has conducted over 45,000 audits of response action submittals to evaluate and ensure compliance of those submittals and the associated response actions with the Massachusetts Contingency Plan.  MassDEP conducts three different types of audits, which are referred to as Level 1 (Technical Screening Audit), Level 2 (Audit Inspection), and Level 3 (Comprehensive Audit).  (Link to Audits Page) The majority of all audits conducted by MassDEP over time (over 80%) have been Level 1 Audits.  The chart below shows the number of audits completed by fiscal year and the type of audit.

MassDEP Audits Complete by Fiscal Year