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Tap water quality report

Wilmington

EPA monitoring tested this supplier for 109 contaminants and detected 27. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
27
detected
5,700
people served
27
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Surface water
Ownership
Local government
Counties served
Will

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.

27
health-based violations
317
violations on file
3
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1997-07-01 → 1997-07-31
MCL Health-based Archived 1997-07-01 → 1997-07-31
MCL Health-based Archived 1995-08-01 → 1995-08-31
MCL Health-based Archived 1995-08-01 → 1995-08-31
MCL Health-based Archived 1995-08-01 → 1995-08-31
MCL Health-based Archived 1995-08-01 → 1995-08-31
TT Health-based Resolved 1994-08-01
TT Health-based Resolved 1994-01-07
MCL Health-based Resolved 1989-10-01 → 1993-09-30
MCL Health-based Resolved 1985-10-09 → 1989-10-08

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0057 µg/L 1/3 2025
PFBS 0.0031 µg/L 1/3 2025
Pfhxa 0.0040 µg/L 1/3 2025
Pfpea 0.0045 µg/L 1/3 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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
15.575 µg/L
No EPA limit set
worst single sample: 19.2 µg/L
78/78 SYR4 2012–2019
Chloroform
64.314 µg/L
No EPA limit set
worst single sample: 76.49 µg/L
78/78 SYR4 2012–2019
Dibromochloromethane
10.915 µg/L
No EPA limit set
worst single sample: 16 µg/L
78/78 SYR4 2012–2019
TTHM
77.45 µg/L 97%
of the EPA limit 80 µg/L
worst single sample: 93.39 µg/L
78/78 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
41.12 µg/L 69%
of the EPA limit 60 µg/L
worst single sample: 47 µg/L
77/78 SYR4 2012–2019
Trichloroacetic Acid
12.04 µg/L
No EPA limit set
worst single sample: 13.9 µg/L
77/78 SYR4 2012–2019
Dichloroacetic Acid
28.9 µg/L
No EPA limit set
worst single sample: 33 µg/L
76/78 SYR4 2012–2019
Copper
209 µg/L 16%
of the EPA limit 1300 µg/L
worst single sample: 520 µg/L
62/62 SYR4 2013–2019
Nitrate
6195 µg/L 62%
of the EPA limit 10000 µg/L
worst single sample: 7300 µg/L
62/68 SYR4 2012–2019
Dibromoacetic Acid
4.856 µg/L
No EPA limit set
worst single sample: 5.5 µg/L
45/78 SYR4 2012–2019
Bromoform
3.535 µg/L
No EPA limit set
worst single sample: 4.9 µg/L
31/78 SYR4 2012–2019
Lead
61.1 µg/L 407%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 73 µg/L
18/62 SYR4 2013–2019
Lead
0.0050 mg/L 33%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2025
Barium
16.5 µg/L 0.8%
of the EPA limit 2000 µg/L
worst single sample: 17 µg/L
11/11 SYR4 2012–2019
Fluoride
1230 µg/L 31%
of the EPA limit 4000 µg/L
worst single sample: 1270 µg/L
11/11 SYR4 2012–2019
Monobromoacetic Acid
8.7815 µg/L
No EPA limit set
worst single sample: 11.2 µg/L
8/78 SYR4 2012–2019
Arsenic
3.62 µg/L 36%
of the EPA limit 10 µg/L
worst single sample: 3.7 µg/L
5/11 SYR4 2012–2019
Combined Radium (-226 And -228)
20.825 pCi/L 417%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
worst single sample: 23 pCi/L
4/4 SYR4 2012–2018
Monochloroacetic Acid
2.945 µg/L
No EPA limit set
worst single sample: 3 µg/L
3/78 SYR4 2012–2019
Nitrate-Nitrite
2800 µg/L 28%
of the EPA limit 10000 µg/L
 2/5 SYR4 2012–2018
Selenium
7.625 µg/L 15%
of the EPA limit 50 µg/L
worst single sample: 7.8 µg/L
2/11 SYR4 2012–2019
Atrazine
0.3500 µg/L 12%
of the EPA limit 3 µg/L
 1/15 SYR4 2012–2019
Chromium
5 µg/L 5%
of the EPA limit 100 µg/L
 1/11 SYR4 2012–2019
82 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, TotalBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GRETENCORD, JAMES
Phone
815-476-3104
Email
JGRETENCORD@WILMINGTON-IL.gov

Frequently asked questions about Wilmington

Is Wilmington tap water safe to drink?

EPA monitoring detected 27 contaminants in Wilmington'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 Wilmington's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Wilmington serve?

Wilmington reports serving 5,700 people in Illinois, per its EPA record.

Has Wilmington had any water quality violations?

The EPA has 317 violations on file for Wilmington, of which 27 are health-based (a contaminant limit or required treatment was breached) and 3 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.