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Tap water quality report

Maryville

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
10,150
people served
4
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Ground water
Ownership
Local government
Counties served
Madison

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.

4
health-based violations
18
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1995-12-01 → 1995-12-31
MCL Health-based Archived 1995-12-01 → 1995-12-31
MCL Health-based Archived 1995-12-01 → 1995-12-31
MCL Health-based Archived 1995-12-01 → 1995-12-31
Other Monitoring Unaddressed 2025-07-01
MR Monitoring Resolved 2008-09-01 → 2008-09-30
MR Monitoring Resolved 2008-09-01 → 2008-09-30
MR Monitoring Resolved 2008-09-01 → 2008-09-30
MR Monitoring Resolved 2008-09-01 → 2008-09-30
MR Monitoring Archived 2000-07-01 → 2000-07-31

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
1576 µg/L 121%
of the EPA limit, in the worst sample — 1300 µg/L
 41/41 SYR4 2014–2018
Nitrate
9270 µg/L 93%
of the EPA limit 10000 µg/L
 32/32 SYR4 2012–2019
Lead
7 µg/L 47%
of the EPA limit 15 µg/L
 27/41 SYR4 2014–2018
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 20/20 LCR 2025
Bromodichloromethane
9.8 µg/L
No EPA limit set
 11/11 SYR4 2014–2019
Bromoform
5.9 µg/L
No EPA limit set
 11/11 SYR4 2014–2019
Chloroform
4.2 µg/L
No EPA limit set
 11/11 SYR4 2014–2019
Dibromochloromethane
14 µg/L
No EPA limit set
 11/11 SYR4 2014–2019
Nitrate-Nitrite
9270 µg/L 93%
of the EPA limit 10000 µg/L
 11/11 SYR4 2012–2015
Dibromoacetic Acid
4.2 µg/L
No EPA limit set
 10/10 SYR4 2014–2019
TTHM
33.3 µg/L 42%
of the EPA limit 80 µg/L
 10/10 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
7.5 µg/L 13%
of the EPA limit 60 µg/L
 10/10 SYR4 2014–2019
Dichloroacetic Acid
2.1 µg/L
No EPA limit set
 9/10 SYR4 2014–2019
Fluoride
1010 µg/L 25%
of the EPA limit 4000 µg/L
 3/4 SYR4 2012–2018
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
 3/10 SYR4 2014–2019
Selenium
3 µg/L 6%
of the EPA limit 50 µg/L
 3/4 SYR4 2012–2018
Arsenic
1.9 µg/L 19%
of the EPA limit 10 µg/L
 1/4 SYR4 2012–2018
Barium
140 µg/L 7%
of the EPA limit 2000 µg/L
 1/4 SYR4 2012–2018
Trichloroacetic Acid
1.6 µg/L
No EPA limit set
 1/10 SYR4 2014–2019
Xylenes, Total
1.5 µg/L 0%
of the EPA limit 10000 µg/L
 1/3 SYR4 2014–2018
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 TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WIEGERS, JAY
Phone
618-345-4197
Email
plantlead@maryville-il.us

Frequently asked questions about Maryville

Is Maryville tap water safe to drink?

EPA monitoring detected 20 contaminants in Maryville'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 Maryville's water?

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

How many people does Maryville serve?

Maryville reports serving 10,150 people in Illinois, per its EPA record.

Has Maryville had any water quality violations?

The EPA has 18 violations on file for Maryville, of which 4 are health-based (a contaminant limit or required treatment was breached) and 1 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.