Is Maryville Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Nodaway

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.

health-based violations

116

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Archived	2025-12-01 → 2025-12-31
TT	Health-based	Archived	2025-12-01 → 2025-12-31
TT	Health-based	Archived	2025-12-01 → 2025-12-31
MCL	Health-based	Resolved	2024-03-01 → 2024-03-31
MCL	Health-based	Resolved	2024-03-01 → 2024-03-31
MCL	Health-based	Resolved	2024-03-01 → 2024-03-31
MCL	Health-based	Resolved	2024-03-01 → 2024-03-31
MCL	Health-based	Resolved	2024-02-01 → 2024-02-29
MCL	Health-based	Resolved	2024-02-01 → 2024-02-29
MCL	Health-based	Resolved	2024-02-01 → 2024-02-29

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0087 µg/L	2/3	2024

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Chlorite	893 µg/L 89% of the EPA limit 1000 µg/L worst single sample: 1120 µg/L	288/288	SYR4	2012–2019
TTHM	56.78 µg/L 71% of the EPA limit 80 µg/L worst single sample: 120 µg/L	128/128	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	47.7 µg/L 80% of the EPA limit 60 µg/L worst single sample: 56.3 µg/L	127/128	SYR4	2012–2019
Bromodichloromethane	11.67 µg/L No EPA limit set worst single sample: 13 µg/L	124/124	SYR4	2012–2019
Chloroform	40.7 µg/L No EPA limit set worst single sample: 46.2 µg/L	124/124	SYR4	2012–2019
Dibromochloromethane	4.7765 µg/L No EPA limit set worst single sample: 5.73 µg/L	124/124	SYR4	2012–2019
Dichloroacetic Acid	33.525 µg/L No EPA limit set worst single sample: 41.2 µg/L	116/116	SYR4	2012–2019
Trichloroacetic Acid	16.025 µg/L No EPA limit set worst single sample: 17.5 µg/L	116/116	SYR4	2012–2019
Copper	224.85 µg/L 17% of the EPA limit 1300 µg/L worst single sample: 496 µg/L	98/98	SYR4	2012–2019
Lead	9.62 µg/L 64% of the EPA limit 15 µg/L worst single sample: 16.8 µg/L	52/98	SYR4	2012–2019
Dibromoacetic Acid	2.7455 µg/L No EPA limit set worst single sample: 2.91 µg/L	34/116	SYR4	2012–2019
Atrazine	2.65 µg/L 88% of the EPA limit 3 µg/L worst single sample: 3.64 µg/L	31/33	SYR4	2012–2019
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	19/19	LCR	2024
Nitrate-Nitrite	360 µg/L 3.6% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Barium	102.6 µg/L 5.1% of the EPA limit 2000 µg/L worst single sample: 104 µg/L	8/8	SYR4	2012–2019
Fluoride	498 µg/L 12% of the EPA limit 4000 µg/L worst single sample: 610 µg/L	8/8	SYR4	2012–2019
Arsenic	2.06 µg/L 21% of the EPA limit 10 µg/L worst single sample: 2.09 µg/L	5/8	SYR4	2012–2019
Chromium	2.99 µg/L 3% of the EPA limit 100 µg/L worst single sample: 3.11 µg/L	4/8	SYR4	2012–2019
Monobromoacetic Acid	3.832 µg/L No EPA limit set worst single sample: 3.89 µg/L	3/116	SYR4	2012–2019
Bromoform	0.6445 µg/L No EPA limit set worst single sample: 0.6500 µg/L	2/124	SYR4	2012–2019
Simazine	0.9900 µg/L 25% of the EPA limit 4 µg/L	1/33	SYR4	2012–2019

77 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-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RIEDEL, RENEE
Phone: 660-562-8001

Frequently asked questions about Maryville

Is Maryville tap water safe to drink?

EPA monitoring detected 22 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 Chlorite, TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Maryville serve?

Maryville reports serving 10,775 people in Missouri, per its EPA record.

Has Maryville had any water quality violations?

The EPA has 116 violations on file for Maryville, of which 75 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.