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About TPU > Services > Water > About Tacoma Water > Water Quality > 2025 Water Quality Report > Water Quality Table – UCMR5*

Water Quality Table – UCMR5*

A two column table compares detected levels and regulatory information for PFHxS and PFBS. It lists each substance’s highest, average, and range of detected levels; state action levels; the 2029 maximum contaminant level for PFHxS; and potential contamination sources, which include discharges from manufacturing and industrial chemical facilities, consumer products, occupational exposures, and certain firefighting activities.

Detailed Accessible Table Description

The table presents monitoring results for two constituents:

  • Perfluorohexanesulfonic Acid (PFHxS)
  • Perfluorobutanesulfonic Acid (PFBS)

The first column lists attribute categories. The second and third columns list the corresponding values for PFHxS and PFBS.

The table contains the following rows and values:

Highest level detected
  • PFHxS: 5.1 ppt
  • PFBS: 3.3 ppt
Average level detected
  • PFHxS: 2.4 ppt
  • PFBS: 0.4 ppt
Range of level detected
  • PFHxS: 0 to 5.1 ppt
  • PFBS: 0 to 3.3 ppt
SAL (State Action Level)
  • PFHxS: 65 ppt
  • PFBS: 345 ppt
MCL effective 2029
  • PFHxS: 10 ppt
  • PFBS: Not applicable (N/A)
Potential sources of contaminant
  • PFHxS: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
  • PFBS: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.