Guidance for Waste Sites

Since 2016, NHDES has requested sampling at waste sites per the provisions of the NH Code of Administrative Rules, Chapters Env-Or 600 and Env-Or 700. A letter clarifying which sites need to complete an initial screening for PFAS was issued in October 2017. The purpose of this sampling is to determine whether any drinking water sources may be at risk associated with releases from the site. Sites that are found to have PFAS releases are subsequently managed through the NHDES Hazardous Waste Remediation Bureau (HWRB).

The types of sites that are required to sample for PFAS include, but are not limited to:

  • Sites subject to Groundwater Release Detection Permits
  • Landfills (lined, unlined, active, and/or closed) that are subject to groundwater monitoring requirements
  • Active hazardous waste sites and sites undergoing environmental site assessment reviewed by the HWRB where either:
    • Site history indicates that releases at a site are associated with activities that use or used PFAS containing products, and/or
    • Sites where Class B firefighting foam [e.g., aqueous film forming foam (AFFF)] may have been used or released.

NHDES requests that PFAS analytical data by uploaded to the NHDES Environmental Monitoring Database (EMD).  Analytical data for regulated PFAS that are uploaded to EMD are posted to the NHDES PFAS Investigation Sampling Map. Site-specific summary reports are available from the NHDES OneStop database for individual sites.

Further Information

Waste Site Investigation FAQs
Reporting data to the NHDES Environmental Monitoring Database (EMD)
Direct Contact Risk-Based Soil Concentrations for PFOA, PFOS, PFHxS and PFNA – updated December 11, 2019
NH Ambient Groundwater Quality Standards (AGQS) Env-Or 600

Sampling Guidance

NHDES has provided guidance documents for facility/property owners, consultants and analytical laboratories. Because of the potential presence of PFASs in common consumer products and in equipment typically used to collect groundwater samples, special handling and care must be taken when collecting samples for analysis.

Sampling Considerations
Hazardous Waste Remediation Bureau Master Quality Assurance Project Plan (QAPP)
Laboratory Testing Guidelines for PFAS and Waste Sites