- EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
- PFPeA (a PFAS): found in 2 of 6 samples, average 4.5 ppt, highest 14 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- PFOS (a PFAS): found in 2 of 6 samples, average 4.3 ppt, highest 14 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
- PFHxS (a PFAS): found in 2 of 6 samples, average 4 ppt, highest 14 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- PFHxA (a PFAS): found in 2 of 6 samples, average 3.8 ppt, highest 12 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- PFBA (a PFAS): found in 2 of 6 samples, average 2.1 ppt, highest 6.7 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- PFHpA (a PFAS): found in 2 of 6 samples, average 1.1 ppt, highest 3.4 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- PFBS (a PFAS): found in 1 of 6 samples, average 0.50 ppt, highest 3.2 ppt (EPA UCMR 5 testing, Jan 2023–Jul 2023)
- Lead, 90th percentile: 8.2 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jul 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Marshfield tap water? What EPA records show
EPA WI7720165 · serves Marshfield, WI · about 18,815 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Marshfield Utilities (EPA WI7720165)
EPA data as of October 14, 2026. For Marshfield's main utility, Marshfield Utilities: We found no health-based violations in EPA's records for this system (WI7720165) since July 1, 2021, as of October 14, 2026. This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing. This is public data, not a test of your tap.
What EPA records show for Marshfield Utilities, as of October 14, 2026
We found no health-based violations in EPA's records for this system (WI7720165) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Marshfield Utilities (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 8.2 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jul 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Marshfield Utilities use chloramine?
We didn't find chloramine in Marshfield Utilities's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.