Well & TapHome Water Treatment Database

Is there PFAS in North Park Pwd water?

Yes. EPA's final UCMR 5 results show North Park Pwd averaged 16.1 ppt of PFHxS at its worst sampling point, 1.6 times the EPA limit of 10 ppt.

North Park Pwd Serves 35,580 people · 6 PFOA samples from 3 sampling points · Feb 2025 to Aug 2025 Average above an EPA limit
PFOA Perfluorooctanoic acid 5.8 ppt avg · max 6.2
EPA 4
PFOS Perfluorooctanesulfonic acid 5.7 ppt avg · max 7.3
EPA 4
PFHxS Perfluorohexanesulfonic acid 16.1 ppt avg · max 18.2
EPA 10
Hazard index GenX, PFBS, PFNA, PFHxS combined 1.6 avg · max 1.8
EPA 1

Also detected, no federal limit: PFBA, PFBS, PFHxA, PFPeA.

Averages are for the worst sampling point, with non-detects counted as zero. Source: EPA UCMR 5.

North Park Pwd is a public water system drawing on groundwater, based in Machesney Park, Illinois, serving about 35,580 people, including Caledonia, Roscoe, Rockford, Loves Park, Machesney Park. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 6 times across 3 sampling points between Feb 2025 and Aug 2025.

Every PFAS detected

PFAS Detected Highest Worst point avg EPA limit
PFHxS
Perfluorohexanesulfonic acid		 4 of 6 18.2 ppt 16.1 ppt 10 ppt
PFOS
Perfluorooctanesulfonic acid		 4 of 6 7.3 ppt 5.7 ppt 4 ppt
PFBA
Perfluorobutanoic acid		 2 of 6 7.0 ppt 6.2 ppt none
PFOA
Perfluorooctanoic acid		 3 of 6 6.2 ppt 5.8 ppt 4 ppt
PFBS
Perfluorobutanesulfonic acid		 5 of 6 5.4 ppt 5.0 ppt none
PFHxA
Perfluorohexanoic acid		 2 of 6 4.7 ppt 4.2 ppt none
PFPeA
Perfluoropentanoic acid		 2 of 6 4.2 ppt 3.7 ppt none

Not detected: PFPeS, ADONA, PFDoA, PFUnA, NEtFOSAA, PFTrDA, PFTA, PFNA, PFHpA, PFMBA, 8:2 FTS, 11Cl-PF3OUdS, PFDA, HFPO-DA, 4:2 FTS, PFHpS, PFMPA, PFEESA, NMeFOSAA, NFDHA, 9Cl-PF3ONS, 6:2 FTS.

Lithium, tested in the same program: highest 9.3 ppb, detected in 1 of 6 samples. EPA's health-based screening level is 10 ppb.

What the EPA limits mean here

In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.

Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.

What you can do at home

Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.

Other systems in Illinois

All 487 tested systems in Illinois

ZIP codes served

61011 61073 61103 61111 61115

As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.

Cite this page

Well & Tap. "PFAS in North Park Pwd water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID IL2015500. https://wellandtap.com/pfas/illinois/north-park-pwd/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID IL2015500). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.