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Marshfield Utilitieswater quality report, rewritten

Serves
18,815
Connections
7,999
Water source
Groundwater
Based in
Marshfield, WI
County
Wood
Owner
Local government

ZIP codes served: 54449

PWSID WI77201652026 edition · EPA data

Read this first

  • PFOS was found in two of 6 samples, highest 14 ppt. Above the 4.0 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.
  • PFHxS was found in two of 6 samples, highest 14 ppt. Above the 10 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.
  • Lead The 90th-percentile result was 8.2 ppb, below the 15 ppb action level. EPA’s health goal for lead is zero.

1 health-based violation since 2016. Details are below.

What handles it

What was found

Highlighted: above the health goal. Circled: above the legal limit in at least one sample. Every scale puts the legal line at its middle.

PFOS

Comes from the source

14ppt

Highest of 6 samples; found in two

Above the 4.0 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.

What handles it

  • NSF/ANSI 53Look for: PFOS ReductionAlso listed as: Total PFAS Reduction; Perfluorooctane Sulfonate (PFOS)
  • NSF/ANSI 58Look for: Perfluorooctane Sulfonate (PFOS)

EPA UCMR 5, samples taken from Jan. 16, 2023 to July 12, 2023. Each blue tick is one sample where it was found.

PFHxS

Comes from the source

14ppt

Highest of 6 samples; found in two

Above the 10 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.

What handles it

  • NSF/ANSI 53Look for: Total PFAS ReductionAlso listed as: Perfluorohexane Sulfonic Acid (PFHxS)

EPA UCMR 5, samples taken from Jan. 16, 2023 to July 12, 2023. Each blue tick is one sample where it was found.

Lead

Comes from pipes, often your own

8.2ppb

90th percentile, 2025

The 90th-percentile result was 8.2 ppb, below the 15 ppb action level. EPA’s health goal for lead is zero.

What handles it

EPA SDWIS, lead and copper monitoring periods ending 2009 to 2025. The pointer marks the latest period; each blue tick is an earlier one.

PFBS

Comes from the source

3.2ppt

Highest of 6 samples; found in one

Below EPA’s hazard index benchmark of 2,000 ppt. PFBS has no legal limit or health goal of its own.

What handles it

EPA UCMR 5, samples taken on Jan. 16, 2023. Each blue tick is one sample where it was found.

Also found, with no federal limit

EPA measured these PFAS to learn how often they occur. None has a legal limit or a health goal yet.

CompoundHighest sampleFound inCertification claim
PFPeA14 ppt2 of 6None covers it
PFHxA12 ppt2 of 6None covers it
PFBA6.7 ppt2 of 6None covers it
PFHpA3.4 ppt2 of 6NSF/ANSI 53: Total PFAS Reduction

Tested and not found

Below EPA’s minimum reporting level in every sample taken from Jan. 16, 2023 to July 12, 2023. Not found means not measured above that level, which is not the same as zero.

  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • HFPO-DA (GenX)
  • Lithium
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpS
  • PFMBA
  • PFMPA
  • PFNA
  • PFOA
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper RuleOCCT/SOWT Study/RecommendationNov. 1, 2020—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record.

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claims: PFOS Reduction, Total PFAS Reduction, Lead Reduction

    For: PFOS, PFHxS, Lead

  • NSF/ANSI 58

    Claims: Perfluorooctane Sulfonate (PFOS), Lead Reduction

    For: PFOS, Lead

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Compare five-year costs

Filters with those claims on a certifier’s listing

TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

What this report cannot tell you

  • Levels of everything else. Federal bulk data carries results for PFAS, lithium, lead and copper, and violations for the rest. Nitrate, arsenic, disinfection byproducts and other levels are in Marshfield Utilities’s own annual report, which it must send you every year.
  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
  • Anything after the latest data. SDWIS data is from 2026 Q2; UCMR 5 samples are from Jan. 16, 2023 to July 12, 2023.

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