Rock Island County Water Quality: 3 Cities Ranked by the Records
Rock Island County, Illinois: 3 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Lead (90th percentile)Detected in 2 systems of 3 tested15 µg/L federal action level · US EPAHighest16 µg/L
- EAST MOLINE16 µg/LMonitoring period: 2026–2026 (still open)
- MOLINE1.3 µg/LMonitoring period: 2026–2028 (still open)
- ROCK ISLANDNot detectedMonitoring period: 2026–2026 (still open)
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 3 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.6 ng/L
- EAST MOLINE3.6 ng/LSample date: 2023-09-12 to 2024-05-06
- MOLINENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-09 to 2025-01-14
- ROCK ISLANDNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-14 to 2023-11-07
Perfluorobutanoic acid (PFBA)Detected in 3 systemsNo federal or state limit; shown for transparencyHighest24 ng/L
- EAST MOLINE24 ng/LSample date: 2023-09-12 to 2024-05-06
- MOLINE22 ng/LSample date: 2024-04-09 to 2025-01-14
- ROCK ISLAND16 ng/LSample date: 2023-02-14 to 2023-11-07
28 substances tested, none detected in any systemShow
Tested in these 3 systems: EAST MOLINE, MOLINE, ROCK ISLAND
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lithium
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
1of 3 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in IllinoisLargest water systems
- MolineMOLINE · IL161045044,500 served
- Rock IslandROCK ISLAND · IL161065039,018 served
- East MolineEAST MOLINE · IL161025021,374 served
Frequently asked
How does Rock Island County tap water compare across cities?
PurityMap ranks 3 cities in Rock Island County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Rock Island's main water system: ROCK ISLAND · PWSID IL1610650 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Rock Island County cities had a PFAS sample above a 2024 EPA limit?
None of the 3 Rock Island County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 3.
Is there lead in Rock Island County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 3 Rock Island County cities reported a value above zero, and 1 city was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
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