Is Marquette, IA Tap Water Safe? Quality & Contaminants

What was found in Marquette's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Fluoride	395 µg/L 9.9% of the EPA limit 4000 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2015	1/1	SYR4
Copper	96.005 µg/L 7.4% of the EPA limit 1300 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Barium	82.595 µg/L 4.1% of the EPA limit 2000 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2015	1/1	SYR4
TTHM	22.205 µg/L 28% of the EPA limit 80 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Lead	18.82 µg/L 125% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Chloroform	17.222 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	9.7 µg/L 16% of the EPA limit 60 µg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Monochloroacetic Acid	8.5 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Combined Radium (-226 And -228)	6.675 pCi/L 134% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Bromodichloromethane	3.391 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Bromoform	1.8945 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Dibromochloromethane	1.542 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Dibromoacetic Acid	0.8135 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Trichloroacetic Acid	0.5900 µg/L No EPA limit set Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2019	1/1	SYR4
Lead	0.0074 mg/L 49% of the EPA limit 0.0150 mg/L Main supplier: MARQUETTE WATER SUPPLY · 429 people · 2024	1/1	LCR

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Marquette

Supplier	Population served
MARQUETTE WATER SUPPLY	429

Frequently asked questions about Marquette tap water

Is Marquette tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Marquette. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Marquette?

1 public water supplier report drinking-water monitoring for Marquette, Iowa to the EPA. Each is listed above with its population served.

What contaminants are in Marquette's water?

The contaminants EPA monitoring detected in Marquette include Fluoride, Copper, Barium, TTHM, Lead. The full list, with the level at the main supplier and the data source, is in the table above.

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.