Legend Technical Services, Inc. is an ISO 17025:2005 accredited laboratory that offers testing for perfluorochemicals, more commonly known as PFAS. Our methods include ASTM D7968 (M) and EPA 537 (M) by LC/MS/MS for soil and groundwater. PFAS samples are analyzed by our St. Paul Laboratory. For additional information and pricing, contact us or call 651-221-4089.

PFAS Analysis

PFAS are contaminants of emerging concern often requiring monitoring and remediation of soil and water. Currently, EPA 537 by liquid chromatography triple quadrupole mass spectrometer (LC/MS/MS) is the only approved method for determining PFAS in drinking water. Other methods have been developed to meet the growing public pressure for the remediation of PFAS in soil and groundwater. Modified methods like EPA 537 (M) and ASTM D7968 (M) are widely accepted by agencies such as the Department of Defense (DoD), state level pollution control agencies, and public health departments to effectively assess PFAS contamination and remediation.

LEGEND’s methods include EPA 537 (M) and ASTM D7968 (M) by LC/MS/MS to positively identify these compounds at low level detection limits; preventing both false negatives and false positives. Our promise is to offer legally defensible data that is accurate and true. This assures that samples analyzed by our laboratory can be used for regulatory and monitoring purposes.


Naming for this class of chemicals:

  • Perfluoroalkyl Substances (PFAS)
  • Perfluorinated Compounds (PFCS)
  • Perfluorinated Alkylated Acids (PFAAS)

Including Perfluorooctanoic Acids (PFOA) and Perfluorooctanesulfonic Acids (PFOS) which have been voluntarily phased out by U.S. manufactures.

GenX is a trade name for a group of replacement chemicals with similar chemical structures/properties to PFOAs and is also a persistent contaminant suspected to be toxic in the environment.


Exposure to PFAS has the potential to accumulate in the body by ingesting PFAS contaminated water and food. Federal and state funded studies have proven that PFAS can cause adverse health effects at a wide range of exposure limits. At high concentrations, PFOA and PFOS can cause birth defects, cancer, and comprise liver, kidney, and thyroid function. Health advisory warnings for PFAS have been issued to protect drinking water and human health.


Communities near PFAS manufacturing facilities and locations where Aqueous Film Forming Foam (AFFF) have been used are prone to contamination. Industrial sources of PFA contamination:

  • DoD sites such as airports and military bases where firefighting training occurs
  • Waste disposal landfills
  • Stain-resistant/waterproof textiles
  • Non-stick cookware
  • Food packaging
  • Rubber and plastics
  • Polishes and paints
  • Biosolids


PFAS Analysis and Salts by LC/MS/MS
Matrix Method Hold-time Container/Preservative
Soil ASTM D7968 (M) 28 Days 40 ml Snap Cap/None
Groundwater EPA 537 (M) 14, 28 Days 500 ml Plastic/None

For analyses with two hold times listed, the first applies to the extraction time, the second for the analysis.

M = Modified Analysis

Analyte List

In early 2019, LEGEND became accredited to analyze PFAS in soil and groundwater by Minnesota Department of Health Environmental Laboratory Accreditation Program (MNELAP). Currently, LEGEND can determine all 21 perfluorochemicals listed in the Minnesota Pollution Control Agency Guidance Document for PFCS. Additional PFAS can be determined by LC/MS/MS upon request. Contact Us for pricing.

MPCA Guidance PFC in Soil and Groundwater
Description Acronym CAS No.


RL (ng/g)


RL (ng/L)

6:2 fluorotelomersulfonate 6:2 FTS 425670-75-3 0.95 6.0
8:2 fluorotelomersulfonate 8:2 FTS 481071-78-7 0.96 3.5
2,3,3,3-Tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy) propanoic acid


(Gen X)

13252-13-6 1.0 5.0
N-Ethylperfluorooctanesulfonamidoacetic acid N-EtFOSAA 2991-50-6 1.0 6.0
N-Methylperfluorooctanesulfonamidoacetic acid N-MeFOSAA 2355-31-9 1.0 4.5
Perfluorobutane sulfonate PFBS 375-73-5 0.44 1.5
Perfluorobutanoic acid PFBA 375-22-4 0.50 2.0
Perfluorodecane sulfonate PFDS 126105-34-8 0.48 4.0
Perfluorodecanoic acid PFDA 335-76-2 0.50 2.5
Perfluorododecanoic acid PFDoA 307-55-1 0.50 5.0
Perfluoroheptanoic acid PFHpA 375-85-9 0.50 1.0
Perfluorohexane sulfonate PFHxS 108427-53-8 0.47 1.5
Perfluorohexanoic acid PFHxA 307-24-4 0.50 1.5
Perfluorononanoic acid PFNA 375-95-1 0.50 3.0
Perfluorooctane sulfonamide FOSA-I 754-91-6 0.50 1.5
Perfluorooctane sulfonate PFOS 45298-90-6 0.48 4.0
Perfluorooctanoic acid PFOA 335-67-1 0.50 2.5
Perfluoropentanoic acid PFPeA 2706-90-3 0.50 1.0
Perfluorotetradecanoic acid PFTeDA 376-06-7 0.50 1.5
Perfluorotridecanoic acid PFTrDA 72629-94-8 0.50 4.5
Perfluoroundecanoic acid PFUnDA 2058-94-8 0.50 2.0

Have more questions?

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