Rock Falls

PWSID: IL1950450Rock FallsView full utility profile

Source data retrieved: April 20, 2026

UCMR 5 monitoring results are not compliance determinations. Detection does not imply regulatory violation or health risk determination. Methodology

Official Record Summary

Official EPA monitoring records show 29 PFAS results for this water system in the UCMR 5 dataset. 1 result reported as detected above the minimum reporting limit. 28 reported as not detected above MRL.

PFAS Monitoring Records

Analyte	Result	Status	Sample Date	Sample Point	Source
11Cl-PF3OUdS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid	0.005 µg/L MRL: 0.005	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
4:2FTS 4:2 Fluorotelomer sulfonic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
6:2FTS 6:2 Fluorotelomer sulfonic acid	0.005 µg/L MRL: 0.005	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
8:2FTS 8:2 Fluorotelomer sulfonic acid	0.005 µg/L MRL: 0.005	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
9Cl-PF3ONS 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid	0.002 µg/L MRL: 0.002	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
DONA 4,8-Dioxa-3H-perfluorononanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
HFPO-DA Hexafluoropropylene oxide dimer acid	0.005 µg/L MRL: 0.005	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
NEtFOSAA N-Ethyl perfluorooctane sulfonamido acetic acid	0.005 µg/L MRL: 0.005	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
NFDHA Nonafluoro-3,6-dioxaheptanoic acid	0.02 µg/L MRL: 0.02	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
NMeFOSAA N-Methyl perfluorooctane sulfonamido acetic acid	0.006 µg/L MRL: 0.006	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFBA Perfluorobutanoic acid	0.011 µg/L MRL: 0.005	Official detection	Apr 7, 2025	TP01	EPA UCMR 5
PFBS Perfluorobutane sulfonic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFDA Perfluorodecanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFDoA Perfluorododecanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFEESA Perfluoro(2-ethoxyethane)sulfonic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFHpA Perfluoroheptanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFHpS Perfluoroheptane sulfonic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFHxA Perfluorohexanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFHxS Perfluorohexane sulfonic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFMBA Perfluoro-4-methoxybutanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFMPA Perfluoro-3-methoxypropanoic acid	0.004 µg/L MRL: 0.004	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFNA Perfluorononanoic acid	0.004 µg/L MRL: 0.004	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFOA Perfluorooctanoic acid	0.004 µg/L MRL: 0.004	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFOS Perfluorooctane sulfonic acid	0.004 µg/L MRL: 0.004	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFPeA Perfluoropentanoic acid	0.003 µg/L MRL: 0.003	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFPeS Perfluoropentane sulfonic acid	0.004 µg/L MRL: 0.004	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFTeDA Perfluorotetradecanoic acid	0.008 µg/L MRL: 0.008	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFTrDA Perfluorotridecanoic acid	0.007 µg/L MRL: 0.007	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5
PFUnA Perfluoroundecanoic acid	0.002 µg/L MRL: 0.002	Official non-detect	Apr 7, 2025	TP01	EPA UCMR 5

Source: EPA UCMR 5 Occurrence Data · Retrieved April 20, 2026

Water System

PWSID

IL1950450

State

Illinois

Population served

8,620

System type

Groundwater

Full utility profile

PFAS Record Summary

Total records29

Official detections1

Official non-detects28

Monitoring results from EPA UCMR 5 are not compliance determinations.

Illinois drinking water overview Rock Falls city water report Illinois PFAS records — all utilities Best filters for PFAS removal PFAS contaminant overview

Official Sources

EPA ECHO Facility Report UCMR 5 Data Finder EPA PFAS Rule

This page shows only official government PFAS records. No risk scores, safety judgments, or inferred compliance determinations are generated by this system. Read methodology

Illinois PFAS records Methodology