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Tap water quality report

Rock Falls

EPA monitoring tested this supplier for 109 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
20
detected
8,620
people served
13
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Ground water
Ownership
Local government
Counties served
Whiteside

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

13
health-based violations
122
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Resolved 1984-06-01 → 1987-05-31
MCL Health-based Archived 1981-06-01 → 1984-05-31
MCL Health-based Archived 1981-06-01 → 1984-05-31
MCL Health-based Archived 1981-06-01 → 1984-05-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0110 µg/L 1/1 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
1170 µg/L 90%
of the EPA limit 1300 µg/L
 45/47 SYR4 2014–2017
Lead
13 µg/L 87%
of the EPA limit 15 µg/L
 23/47 SYR4 2014–2017
Lead
0.0044 mg/L 29%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2025
Nitrate
1400 µg/L 14%
of the EPA limit 10000 µg/L
 18/18 SYR4 2012–2019
Bromodichloromethane
19.5 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
Chloroform
47.6 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
Dibromochloromethane
10.2 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
Dichloroacetic Acid
20.6 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
TTHM
76.2 µg/L 95%
of the EPA limit 80 µg/L
 14/14 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
34.3 µg/L 57%
of the EPA limit 60 µg/L
 14/14 SYR4 2012–2019
Trichloroacetic Acid
10.8 µg/L
No EPA limit set
 14/14 SYR4 2012–2019
Dibromoacetic Acid
2.93 µg/L
No EPA limit set
 11/14 SYR4 2012–2019
Bromoform
2.59 µg/L
No EPA limit set
 9/14 SYR4 2012–2019
Nitrate-Nitrite
344 µg/L 3.4%
of the EPA limit 10000 µg/L
 6/6 SYR4 2012–2018
Barium
150 µg/L 7.5%
of the EPA limit 2000 µg/L
 4/4 SYR4 2012–2018
Arsenic
12 µg/L 120%
of the EPA limit, in the worst sample — 10 µg/L
 3/4 SYR4 2012–2018
Fluoride
873 µg/L 22%
of the EPA limit 4000 µg/L
 3/4 SYR4 2012–2018
Monobromoacetic Acid
1.62 µg/L
No EPA limit set
 3/14 SYR4 2012–2019
Combined Radium (-226 And -228)
0.8700 pCi/L 17%
of the EPA limit 5 pCi/L
 1/2 SYR4 2015–2016
89 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BLACKERT, ROBBIN
Phone
815-564-1366
Email
RBLACKERT@ROCKFALLS61071.COM

Frequently asked questions about Rock Falls

Is Rock Falls tap water safe to drink?

EPA monitoring detected 20 contaminants in Rock Falls's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Rock Falls's water?

EPA monitoring detected Copper, Lead, Lead, Nitrate, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Rock Falls serve?

Rock Falls reports serving 8,620 people in Illinois, per its EPA record.

Has Rock Falls had any water quality violations?

The EPA has 122 violations on file for Rock Falls, of which 13 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.